Steve DiMarco
  • Professor, Oceanography
  • Director Geochemical and Environmental Research Group (GERG)
  • Professor, Ocean Engineering Department (Courtesy Joint Appointment)
Google Scholar Profile

Biography

 

Current Graduate Students

Sakib Mahmud (Ph.D.): Estimating Ocean Dissipation Rates in the Gulf of Mexico using Direct Observations and Buoyancy Glider Flight Characteristics

Xiao Ge (Ph.D.): Deepwater Processes of the Gulf of Mexico: Observing and Data Assimilation Applications to Loop Current Attachment and Reattachment

Robbie Iles (PhD): Diagnosing CDOM Dynamics in A River-Dominated Coastal Margin: Application to the Texas-Louisiana Shelf Using Machine Learning and Autonomous Vehicles

Samantha Longridge (MS): A Machine learning Approach to Identify the Dominant Oceanographic Process Influencing Hypoxia in the Gulf of Mexico

Ysabel Wang (MS): Physical Processes Controlling Coastal Acidification of the Northern Gulf of Mexico

Gianna Milton (MS): Coastal Processes of the Eastern Mediterranean Sea from the THEMO Ocean Observing System

 

Alumni

Master of Science

Luz Areli Zarate: Resolving the Small-Scale Spatial Structure of the Upper Texas Coast, 2018 

Laura Spencer: Water-column inertial and sub-inertial oceanic response to Hurricane Isaac in the deepwater Gulf of Mexico, 2014

Heather Zimmerle: Characterizing the interannual variability of the Texas Coastal Current, 2014

Stuart Pearce: Ocean Response to Hurricane Forcing: Hurricane Andrew on the Texas-Louisiana Shelf, 2011

Sarah Stryker: Circulation dynamics of the northwestern Indian Ocean and of the Gulf of Oman, 2011

Michael Lalime: Deepwater observations of the northern Gulf of Mexico, 2010

Kelly Cole: Low-frequency variability of currents in the deep Gulf of Mexico, 2008

Sudeshna Lahiry: Oceanographic property distributions of the Texas-Louisiana Shelf, 2007

Allyson Azzara: Characterization of the deep scattering layer in the Gulf of Mexico as they relate to Sperm Whale diving and foraging behavior (co-chair Douglas Biggs), 2006

Amanda Kahltenberg: 38-kHz ADCP investigation of deep scattering layers in the Sperm Whale habitat in the northern Gulf of Mexico (co-chair Douglas Biggs), 2004

Laurie Sindlinger ADCP backscatter measurements in the northeastern Gulf of Mexico: Comparison of near-surface with near-bottom backscatter (co-chair Douglas Biggs), 2003

Rebecca Scott: Spatial and temporal variability of plankton stocks from acoustic backscatter intensity and direct measurements in the northeastern Gulf of Mexico (co-chair Douglas Biggs), 2001

 

Doctor of Philosophy

Hilal Al-Shaqsi: Temporal and Spatial Variability of the Ras Al-Hadd Jet/Front in the Northwest Arabian Sea, 2017

Shelton M Gay III: Seasonal variation in hydrography of small fjords in Prince Williams Sound, Alaska, 2013

Bo Li: Dissertation: Stratification limited vertical ventilation: Effects of water-column stability on the formation of hypoxia on the Texas-Louisiana Shelf, 2013

Ruth Mullins-Perry: Coastal Hypoxia on the Texas Shelf: An Ocean Observing and Management Approach to Improving Gulf of Mexico Hypoxia Monitoring, 2012

Cathy Yang Feng: Biological/physical modeling of hypoxia on the Texas-Louisiana (co-chair George Jackson), 2012

Michael Xiaoqian Zhang: Air-sea interaction at critical latitudes, 2009

Valeriya Kiselkova: Relating instabilities to dissolved oxygen on a continental shelf, 2008

 

Undergraduate Research Scholars

Hannah Diaz: Characterization of the Deepwater currents near the Deepwater Horizon Spill Site. TAMU Undergraduate LAUNCH Scholar 2021

Elizabeth Ramey: Undergraduate Research Scholar - Monitoring the Extent of the Dead Zone in the Gulf of Mexico with Gliders. 2016 

Rebecca Gray: Hypoxia in the Gulf of Mexico, geological history of hypoxia in the Gulf of Mexico (2014)

 

Master of Geosciences (non-thesis)

Mohammed Al Mazouqi, 2013

Saud Al-Busaidi, 2011

Ashlie Sears: 2008

 

GERG Interns:

Reshmi Joseph, 2021

Joseph Marble, 2019-2020

Synclaire Truesdale, 2019

Courtland Keith, 2018

Luke Travis, 2018, 2019

Brooke Barker, 2017

Patricia Carillo, 2017

Kyle Grover, 2017

 

Postdocs Advised:

Hilal al-Shaqsi:2017 – 2018 (Arabian Sea: Sultanate of Oman, Ministry of Fisheries Wealth)

Leila Belabbassi:2007 – 2009 (Oman Project, Lighthouse LLC)

Chuan-Yuan Franke Hsu: 2018 – 2020 (GCOOS)

Chan Joo Jang:2007 – 2008 (Oman Project, Lighthouse LLC)

Joseph Kuehl: 2012 – 2014 (GISR Consortium, GoMRI) as Assistant Research Scientist

Ruth Perry: 2013 – 2014 (NOAA and Texas Sea Grant College Program Hypoxia of the northwest Gulf of Mexico)

Zhankun Wang: 2009 – 2012, 2012-2015 as Assistant Research Scientist (Oman Project and GISR Consortium)

Binbin Wang: 2016 - 2018, as Assistant Research Scientist (25% effort; GoMIX Project GoMRI)

Kerri Whilden: 2015 - 2017, 2017-2018 as Assistant Research Scientist (TGLO HF Radars)

Michael Xiaoqian Zhang:   2009 – 2011 (NOAA Hypoxia MCH Project)

 

Professional Links

 

Additional Information

979-458-9323 (GERG)

ResearcherID Profile: http://www.researcherid.com/rid/D-3650-2012

Research Interests

Physical Oceanography, Observing Systems (Buoys, Autonomous Vehicles, HF Radar), Operational Oceanography, Marginal Seas 

 

Educational Background

  • Ph.D. Physics, University of Texas at Dallas, 1991
  • M.S. Physics, University of Texas at Dallas, 1988
  • B.A., Physics, University of Dallas, 1985

Industry Experience

    • Ocean Observing Team Lead, GERG, Texas A&M University: 2013-present 
    • Professor, Department of Oceanography, Texas A&M University 2013 – present
    • Professor, Ocean Engineering Department, Texas A&M University 2020 - present
    • Associate Professor, Department of Oceanography, Texas A&M University 2004 - 2013
    • Associate Research Scientist, Department of Oceanography, Texas A&M University, 2000 - 2004
    • Assistant Research Scientist, Department of Oceanography, Texas A&M University, 1994 - 2000
    • Research Associate, GERG, Texas A&M University, 1993 -1994
    • Postdoctoral Research Associate (Advisor: M. O. Scully now at TAMU), Physics Department, University of New Mexico, 1991 - 1993
    • Visiting Scientist, Max-Planck-Institute for Quantum Optics, Munich, Germany, 1992

Awards & Honors

  • Fellow, Marine Technology Society (2020) (link: www.mtsociety.com)
  • College of Geosciences 2013 Distinguished Achievement Award for Research
  • The Association of Former Student of Texas A&M University, Distinguished Achievement Award for Teaching (College Level) 2009
  • DiMarco Basin: Undersea Feature ID: 13632299, Name ID: 17292868, 04 March 2016 USBGN
  • Sigma Xi (National Research Society), 2000

Selected Publications

    1. Potter, H., CY Hsu, SF DiMarco, 2021. Rapid dissipation of a Loop Current eddy due to interaction with a severe Gulf of Mexico hurricane. Ocean Dynamics, 1-12.
    2. ‡Wei, J., Ren, T., Yang, P., DiMarco, SF,  Mlawer, E., 2021. An improved ocean surface albedo computational scheme: Structure and Performance. Journal of Geophysical Research: Oceans, e2020JC016958.
    3. Wu, H., Wang, B., DiMarco, SF, Tan, L. (2021) Impact of bubble size on turbulent statistics in bubble plumes in unstratified quiescent water. International Journal of Multiphase Flow, 103692.
    4. Wang, B., Jun, I., Socolofsky, S. A., DiMarco, S. F., & Kessler, J. (2020). Dynamics of gas bubbles from a submarine hydrocarbon seep within the hydrate stability zone. Geophysical Research Letters, 47, e2020GL089256. https://doi.org/10.1029/2020GL089256 
    5. ‡Geng Li, B. Wang, H. Wu, SF DiMarco, 2020. Impact of bubble size on the integral characteristics of bubble plumes in quiescent and unstratified water.  International Journal of Multiphase Flow. 125, 103230. 
    6. ‡W Zhang, RD Hetland, V Ruiz, SF DiMarco, H Wu, 2020. Stratification duration and the formation of bottom hypoxia over the Texas-Louisiana shelf. Estuarine, Coastal and Shelf Science, 106711.
    7. ‡J Kim, P Chapman, G Rowe, SF DiMarco, 2020. Categorizing zonal productivity on the continental shelf with nutrient-salinity ratios. Journal of Marine Systems, 103336.
    8. ‡A. Kealoha, K. Shamberger, SF DiMarco, K Thyng, RD Hetland, D Manzello, I Inochs, N Slowey Surface seawater CO2 trends in the Gulf of Mexico. Nature Scientific Reports, 10(1) 1-13.
    9. ‡J Kim, P Chapman, G Rowe, SF DiMarco, DCO Thornton, 2020. Implications of different nitrogen input sources for potential production and carbon flux estimates in the coastal Gulf of Mexico (GOM) and Korean Peninsula coastal waters. Ocean Science 16 (1), 45-63
    10. ‡A. K. Kealoha, Shawn M. Doyle, Robert D. Hetland, SF DiMarco, Jason B. Sylvan, Katie E. Shamberger, 2020. “Localized Hypoxia Drives Coral Reef Mortality at the Flower Garden Banks”.  Corel Reefs. https://doi.org/10.1007/s00338-019-01883-9
    11. ‡F. Yang, S.F. DiMarco, K. Balaguru, T. Lee. 2019. Effects of physical and biological processes to the spatial and temporal variability of Louisiana hypoxic potential during 1985 – 2009. JGR-Biogeosciences 124 (7), 1939-1960. https://doi.org/10.1029/2018JG004745.
    12. Domingues R, Kuwano-Yoshida A, Chardon-Maldonado P, Todd RE, Halliwell G, Kim H-S, Lin I-I, Sato K, Narazaki T, Shay LK, Miles T, Glenn S, Zhang JA, Jayne SR, Centurioni L, Le Hénaff M, Foltz GR, Bringas F, Ali MM, DiMarco SF, Hosoda S, Fukuoka T, LaCour B, Mehra A, Sanabia ER, Gyakum JR, Dong J, Knaff JA and Goni G (2019) Ocean Observations in Support of Studies and Forecasts of Tropical and Extratropical Cyclones. Front. Mar. Sci.6:446. doi: 10.3389/fmars.2019.00446
    13. H. Potter, S.F. DiMarco, A. H. Knap, 2019. Tropical cyclone heat potential and the rapid intensification of Hurricane Harvey in the Texas Bight. Journal of Geophysical Research – Oceans.  124 (4), 2440-2451.
    14. Testor P, de Young B, Rudnick D, Glenn S, Hayes D, Lee CM, Pattiaratchi C, Hill K, Heslop E, Turpin V, Alenius P, Barrera C, Barth J, Beaird N, Bécu G, Bosse A, Bourrin F, Brearley A, Chao Y, Chen S, Chiggiato J, Coppola L, Crout R, Cummings J, Curry B, Curry R, Davis R, Desai K, DiMarco S, Edwards C, Fielding S, Fer I, Frajka-Williams E, Gildor H, Goni G, Gutierrez D, Haugan P, Hebert D, Heiderich J, Hanson S, Heywood K, Hogan P, Houpert L, Huh S, Inall ME, Ishii M, Ito S-i, Itoh S, Jan S, Kaiser J, Karstensen J, Kirkpatrick B, Klymak J, Kohut J, Krahmann G, Krug M, McClatchie S, Marin F, Mauri E, Mehra A, Meredith MP, Meunier T, Miles T, Morell J, Mortier L, Nicholson S, O’Callaghan J, O’Conchubhair D, Oke P, Sanz EP, Palmer M, Park J, Perivoliotis L, Poulain P-M, Perry R, Queste B, Rainville L, Rehm E, Roughan M, Rome N, Ross T, Ruiz S, Saba G, Schaeffer A, Schönau M, Schroeder K, Shimizu Y, Sloyan B, Smeed D, Snowden D, Song Y, Swart S, Tenreiro M, Thompson A, Tintore J, Todd R, Toro C, Venables H,Wagawa T,Waterman S,Watlington R and Wilson D (2019) OceanGliders: A Component of the Integrated GOOS. Front. Mar. Sci. 6:422. doi: 10.3389/fmars.2019.00422
    15. Hu, X., M.F. Nutall, H. Wang, H. Yao, C.J. Staryk, M.M. McCutcheon, R.J. Echart, J.A. Embesi, M.A. Johnston, E.L. Hickerson, G.P. Schmahl, D. Manzello, I.C. Enochs, S.F. DiMarco, and L. Barbero, 2018. Marine Chemistry. 205, 16-28.
    16. P Chapman, S DiMarco, R Hetland, S Socolofsky, 2018. From Bubbles to Beaches: An Integrated Modeling Approach to Oil Spill Response. Marine Technology Society Journal 52 (6), 91-94.
    17. ‡Z. Jing, P. Chang, SF DiMarco, L Wu, 2018. Observed energy exchange between low-frequency flows and internal waves in the Gulf of Mexico. J. Phys. Oceangr. 48(4), 995-1008. 
    18. Dierks, A, C Dike, VL. Asper, SF DiMarco, JP Chanton, U Passow, 2018. Scales of seafloor sediment resuspension in the northern Gulf of Mexico", Elementa. 6 (1)
    19. National Academies of Sciences, Engineering, and Medicine. 2018. Understanding and Predicting the Gulf of Mexico Loop Current: Critical Gaps and Recommendations. Washington, DC: The National Academies Press. https://doi.org/10.17226/24823. (DiMarco on Committee)
    20. Chapman, P. SF DiMarco, R. Key, C. Previtti, S. Yvon-Lewis, 2018. Age of Gulf of Mexico water. Radiocarbon 60(1) 75-90.
    21. Goni, Gustavo J., Todd, Robert E., Jayne, Steven R., Halliwell, George R., Glenn, Scott, Dong, Jili, Curry, Ruth G., Domingues, Ricardo, Bringas, Francis, Centurioni, Luca R., DiMarco, Steven F., Miles, Travis, Morell, Julio M., Pomales, Luis, Kim, Hyun-Sook, Robbins, Pelle E., Gawarkiewicz, Glen G., Wilkin, John L., Heiderich, Joleen, Baltes, Rebecca, Cione, Joseph J., Seroka, Greg, Knee, Kelly, Sanabia, Elizabeth, 2017. Autonomous and Lagrangian ocean observations for Atlantic tropical cyclone studies and forecasts, Oceanography 30, no. 2 (2017): 92–103, DOI:10.5670/oceanog.2017.227, https://hdl.handle.net/1912/9270.
    22. ‡Ramey, E., SF DiMarco, K. Dreger, H. Zimmerle, Performance of an ocean buoyancy glider in a coastal region: Application to the Gulf of Mexico Hypoxic Zone, 2017. Marine Technology Society Journal 51 (4) 41-51.
    23. ‡Vitale, S., S.F. DiMarco, H. Seidel and Z. Wang: Circulation Analysis in the NW IO using ARGO floats and Surface Drifter Observations and SODA Reanalysis Output. Dynamics of Atmospheres and Ocean, Elsevier. 78, 57-70.
    24. ‡Zarate, L., K. Whilden, S.F. DiMarco, A.H. Knap, and J.N. Walpert J.N.  (2016). A high frequency radar oceanic current monitoring system for the Texas Coast: Enhancement to the Texas Automated Buoy System Network. Oceans 2016 Marine Technology Society MTS/IEE Conference in Monterey California. Pp 1-7. 
    25. Ledwell, J. R., R. He, Z. Xue, S. F. DiMarco, L. Spencer, and P. Chapman (2016), Dispersion of a tracer in the deep Gulf of Mexico, J. Geophys. Res. Oceans, 121, doi:10.1002/2015JC011405.
    26. Thyng, K., M., C. Greene, R D Hetland, H.M. Zimmerle, S. F. DiMarco, "True Colors of Oceanography Guidelines for Effective and Accurate Colormap Selection." (2016): Oceanography 29(3) 9-13.
    27. ‡L. J. Spencer, S. F. DiMarco, Z. Wang, J. J. Kuehl, D.A. Brooks, (2016). Asymmetric Oceanic Response to a Hurricane: Deepwater Observations during Hurricane Isaac. J. Geophys. Res. Oceans, 121, 7619-7649. doi: 10.1002/2015JC011560.
    28. Zhankun Wang, Steven F DiMarco, Scott A Socolofsky, 2016. Turbulence measurements in the northern Gulf of Mexico: Application to the deepwater horizon oil spill on droplet dynamics. Deep Sea Research. 109, 40-50.
    29. Benny J. Gallaway, William J. Gazey, Charles W. Caillouet, Jr., Pamela T. Plotkin, Donna J. Shaver, F. Alberto Abreu Grobois, Anthony M. Amos, Patrick M. Burchfield, Ray R. Carthy, Marco  A. Castro Martínez, John G. Cole, Andrew T. Coleman, Melissa Cook, Steven DiMarco, Sheryan P. Epperly, Allen M. Foley, Masami Fujiwara, Daniel Gomez Gamez, Gary L. Graham, Wade L. Griffin, Selina S. Heppell, Francisco Illescas Martínez, Jackie Isaacs, Margaret M. Lamont, Rebecca L. Lewison, Kenneth J. Lohmann, James M. Nance, Jonathan Pitchford, Nathan F. Putman, Scott W. Raborn, Jeffery K. Rester, Jack J. Rudloe, Laura Sarti Martínez, Mark Schexnayder, Jeffrey R. Schmid, Christopher Slay, Mandy Tumlin, Thane Wibbels and Blanca M. Zapata Najera; 2016. Development of a Kemp’s Ridley Sea Turtle Stock Assessment Model. Gulf of Mexico Science, Special Issue on Sea Turtles, Ed. P. T. Plotkin. Dec 2016. Pub. Dauphin Island Sea Lab, AL. Vol 33 (2), 138-157.
    30. ‡Zhao Jing, Ping Chang, SF DiMarco, Lixin Wu, 2015. Role of near-inertial internal waves in sub-thermocline diapycnal mixing in the northern Gulf of Mexico. JPO 45(12), 3137-3154.
    31. ‡Adriana Mendez-Jimenez, WD Heyman, and SF DiMarco, 2015. Surface drifter movement indicates onshore egg transport from a reef fish spawning aggregation. Physical Geography, DOI: 10.1080/02723646.2015.1023243, pp. 1-14. 
    32. ‡W. Zhang, RD Hetland, SF DiMarco, K Fennel, 2015. Processes controlling mid-water column oxygen minima over the Texas-Louisiana Shelf. J. Geophys. Res. 120(4), 2800-2812.
    33. ‡Clifton C Nunnally, Antonietta Quigg, Steve DiMarco, Piers Chapman, Gilbert T Rowe, 2014. Benthic–pelagic coupling in the Gulf of Mexico hypoxic area: Sedimentary enhancement of hypoxic conditions and near bottom primary production. Continental Shelf Research. 85, 143-152.
    34. Zhankun Wang, Steven F DiMarco, Stephanie Ingle, Leila Belabbassi, Lubna H Al-Kharusi, 2014. Seasonal and annual variability of vertically migrating scattering layers in the northern Arabian Sea. Deep Sea Research Part I: Oceanographic Research Papers. 90, 152-165.
    35. Joseph J Kuehl, Steven F DiMarco, Laura J Spencer, Norman L Guinasso, 2014. Application of the Smooth Orthogonal Decomposition to oceanographic datasets. Geophy. Res. Lett. 44(11), 3966-3971. 
    36. ‡Y. Feng, K. Fennel, G.A. Jackson, S. F. DiMarco, R. D. Hetland, 2014. A model study of the response of hypoxia to upwelling favorable wind on the northern Gulf of Mexico Shelf. J. of Marine Systems. 131 (March 2014), 63-73. http://dx.doi.org/10.1016/j.jmarsys.2013.11.009
    37. NL Guinasso, JN Walpert, LL Lee III, SF DiMarco, S Buschang, 2014. Texas Automated Buoy System provides situational awareness of winds and currents on the coast of Texas. Proceedings of the American Petroleum Institute. International Oil Spill Conference Proceedings, 2014(1), 300175.
    38. Wang, Z., SF DiMarco, S. Ingle and L. Belabbassi, 2013, A cabled oceanographic monitoring network in the northern Arabian Sea: success, challenges and opportunities, Advances in Earth Science, 28(5): 529-536.  (In Chinese). 
    39. TS Bianchi, F Garcia‐Tigreros, SA Yvon‐Lewis, M Shields, H J Mills, D Butman, C Osburn, P Raymond, G C Shank, SF DiMarco, N Walker, B Kiel Reese, R Mullins‐Perry, AS Quigg, GR Aiken, E L Grossman, 2013. Enhanced transfer of terrestrially derived carbon to the atmosphere in a flooding event. Geophysical Research Letters 40 (1), 116-122.
    40. Z. Wang, SF DiMarco, AE Jochens, and S. Ingle. 2013. High salinity events in the northern Arabian Sea and Sea of Oman. Deep Sea Research – I. 74, 14-24.
    41. S.F. DiMarco, Zhankun Wang, Ann Jochens, Leila Belabbassi, Lubna Al-Kharusi, Matthew Howard, Marion Stoessel, Stephanie Ingle, and Ken du Vall. 2012. Cabled Ocean Observatory in the Sea of Oman and Arabian Sea. Eos, 93(31) 31 July 2012.
    42. X. Zhang, R.D. Hetland, M. Marta-Almeida, S.F. DiMarco, A numerical investigation of the Mississippi and Atchafalaya 1 freshwater transport, filling and flushing times on the Texas-Louisiana Shelf. J. Geophys. Res., 117, C11009 doi:10.1029/2012JC008108.
    43. ‡Y. Feng, S. F. DiMarco, and G. A. Jackson, The relative role of upwelling favorable wind and Mississippi River forcing of the northern Gulf of Mexico hypoxia, Geophys. Res. Lett. doi:10.1029/2012GL051192, 39, L09601.
    44. ‡J. Strauss, E. Grossman, S. F. DiMarco. Stable isotopes in mollusk shells as indicators of benthic respiration and freshwater penetration on the Texas-Louisiana Shelf. Bulletin of Marine Science. Doi:10.5343/bms.2011.1047. 88(4), 817-842 (26).
    45. ‡Josiah Strauss, Ethan L Grossman, S. F. DiMarco, 2012. Stable isotope characterization of hypoxia-susceptible waters on the Louisiana shelf: Tracing freshwater discharge and benthic respiration, Contiental Shelf Research 47, 15 September 2012, 7-15.
    46. Z. Wang, S.F. DiMarco, M. Stoessel, X. Zhang, M.K. Howard, K. du Vall,. 2012. Oscillation responses to Tropical Cyclone Gonu in the northern Arabian Sea from a moored observing system. Deep Sea Research-I, Volume 64, June 2012, Pages 129-145, ISSN 0967-0637, 10.1016/j.dsr.2012.02.005.
    47. S. F. DiMarco, J. Strauss, N. May, R. L. Mullins-Perry, E. Grossman, and D. Shormann, 2012. Texas coastal hypoxia linked to Brazos River discharge as revealed by oxygen isotopes. Aquatic Geochemistry. Doi:10.1007/s10498-011-9156-x 18(2), 159-181.
    48. R. D. Hetland and S. F. DiMarco, 2012. Skill assessment of a numerical model of the Texas-Louisiana Shelf. Ocean Modeling. 43-44, 64-76. Doi:10.1016/j.ocemod.2011.11.009.
    49. Ingle, S. L. Belabbassi, K. du Vall, D. Potter, S.F. DiMarco, Z. Wang (2012). A 4000-meter-rated deepwater cabled ocean observing system: Lessons learned from two years of operation. IEEE Oceans 2012, 1-5.
    50. DR Forrest, RD Hetland, SF DiMarco, 2012. Corrigendum: Multivariable statistical regression models of the areal extent of hypoxia over the Texas–Louisiana continental shelf, Environmental Research Letters 7 (1), 019501
    51. DR Forrest, RD Hetland, SF DiMarco. 2011. Multivariate investigation of hypoxia of hypoxia of the northern Gulf of Mexico. Environmental Research Letters. 6(4) 045002, doi:10.1088/1748-9326/6/4/045002
    52. K. Fennel, R. Hetland, Y. Feng, and S. F. DiMarco, 2011. A coupled physical-biological model of the northern Gulf of Mexico shelf: model description, validation, and analyses of phytoplankton variability. Biogeochemistry 8:1881-1899. doi:10.5194/bg-8-1881-2011.
    53. ‡RL Mullins, SF DiMarco, J Walpert, NL Guinasso. Interdisciplinary Ocean Observing on the Texas Coast. MTS-Journal 45(1), 98-111, 2011.
    54. ‡X. Li, T. S. Bianchi, Z. Yang, L. Osterman, M. Allison, S. DiMarco, G. Yang, 2011. Historical trends of hypoxia in Changjiang River estuary: Applications of chemical biomarkers and microfossils. Journal of Marine Systems 86, 57-68.
    55. T. S. Bianchi, M. A. Allison, P. Chapman, J. H. Cowan, M. J. Dagg, J. W. Day, S. F. DiMarco, Jr., R. D. Hetland, R. W. Powell, 2010. Hypoxia in the northern Gulf of Mexico: Connecting Science with Policy. EOS. 11 May 2010.
    56. T. S. Bianchi, S. F. DiMarco, J. H. Cowan, Jr., R. D. Hetland, P. Chapman, J. W. Day, M. A. Allison, 2010. The Science of Hypoxia in the northern Gulf of Mexico: A Review. Science of the Total Environment. 408, 1471-1484.
    57. S. F. DiMarco, P. Chapman, N. Walker, R. Hetland, 2010. Does local topography control hypoxia of the Texas-Louisiana Shelf? Journal of Marine Systems, 80(1-2) 25-35.
    58. ‡X. Zhang, S. F. DiMarco, D. C. Smith, R. D. Hetland, 2010. Sea-breeze driven ocean Poincare wave propagation and mixing near the critical latitude with applications in the Gulf of Mexico. Journal of Physical Oceanography, 40, 48-66, DOI: 10.1175/2009JPO4216.1
    59. L. E. Osterman, R. Z. Poore, P. W. Swarzenski, D. Senn, and S. F. DiMarco, 2009. 20th Century development and expansion of Louisiana shelf hypoxia, Gulf of Mexico. Geomarine Letters. 29(6), 405-414.
    60. E. J. D’Sa and S. F. DiMarco, 2009. Seasonal variability and controls on chromophoric dissolved organic matter in large river-dominated coastal margin. Limnology and Oceanography, 54(6), 2233-2242.
    61. T. S. Bianchi, S. F. DiMarco, R. W. Smith, and K. M. Schreiner, 2009. A Gradient of Dissolved Organic Carbon and Lignin from Terrebonne-Timbalier Bay Estuary to the Louisiana Shelf (USA). Marine Chemistry. 117(1-4), 32-41.
    62. S. F. DiMarco and D. Wu, 2009. U.S. and Chinese Scientists Discuss the Ocean's Response to Climate Change. Eos Trans. American Geophysical Union. 90(14), pp. 121. doi:10.1029/2009EO140009, 2009.
    63. ‡X. Zhang, S. F. DiMarco, D. C. Smith, IV, M. K. Howard, A. E. Jochens, and R. D. Hetland, 2009. Near-resonant ocean response to sea breeze on a stratified continental shelf. Journal of Physical Oceanography, 39, 2137-2155. DOI: 10.1175/2009JPO4054.1.
    64. T. S. Bianchi, S. F. DiMarco, M. A. Allison, P. Chapman, J. C. Cowan, R. D. Hetland, J. W. Morse, G. Rowe, 2008. Controlling hypoxia on the U.S. Louisiana Shelf: Beyond the nutrient-centric view. EOS, Transactions, American Geophysical Union. 89(26), pp. 236-237.
    65. A.E. Jochens and S. F. DiMarco, 2008. Physical oceanographic conditions in the Gulf of Mexico during 2002-2004. Deep Sea Research Part II, 55, 2541-2554.
    66. R.D. Hetland and S. F. DiMarco, 2008. How does the character of oxygen demand control the structure of hypoxia on the Texas-Louisiana continental shelf? J. of Marine Systems, 70(1-2), 49-62.
    67. ‡A. M. Kaltenberg, D. C. Biggs, and S. F. DiMarco, 2007. Deep scattering layers of the northern Gulf of Mexico observed with a ship-board 38-kHz acoustic Doppler current Profiler (ADCP).  Gulf of Mexico Science, 2, 97-108.
    68. D. C. O. Thornton, E. M. Fejes, S. F. DiMarco, and K. M. Clancy, 2007. Measurement of acid polysaccharides in marine and freshwater samples using alcian blue. Limnol. Oceanogr. Methods 5, 73-87.
    69. S. F. DiMarco, L. Campbell, and N. L. Guinasso, Jr., 2005. A new Master’s level Certificate in Ocean Observing Systems at Texas A&M University. Marine Technol. Soc. Journal 39(3), 13-15.
    70. S. F. DiMarco, R. O. Reid, W. D. Nowlin, Jr., 2005. A Statistical Description of the Near-surface Velocity Field from Drifters in the Gulf of Mexico. Geophysical Monograph Series, Volume 161, Circulation of the Gulf of Mexico: Observations and Models.  Eds. W. Sturges and A. Lugo-Fernandez. American Geophysical Union, pp. 101 - 110.
    71. D. C. Biggs, A. E. Jochens, M. K. Howard, S. F. DiMarco, K. D. Mullin, R. R. Leben, F. E. Muller-Karger, and C. Hu, 2005. Eddy Forced Variations in On- and Off-Margin Summertime Circulation Along the 1000-m Isobath of the Northern Gulf of Mexico, 2000-2003, and Links with Sperm Whale Distributions Along the Middle Shelf. Geophysical Monograph Series, Volume 161, Circulation of the Gulf of Mexico: Observations and Models.  Eds. W. Sturges and A. Lugo-Fernandez. American Geophysical Union, pp. 71 - 86.
    72. W. D. Nowlin, Jr., A. E. Jochens, S. F. DiMarco, 2005. Low-frequency Circulation Over the Texas-Louisiana Continental Shelf. Geophysical Monograph Series, Volume 161, Circulation of the Gulf of Mexico: Observations and Models.  Eds. W. Sturges and A. Lugo-Fernandez. American Geophysical Union, pp. 219 – 240.
    73. Vazquez de la Cerda, A., R. O. Reid, S. F. DiMarco, A. E. Jochens, 2005. Bay of Campeche Circulation: an Update. Geophysical Monograph Series, Volume 161, Circulation of the Gulf of Mexico: Observations and Models.  Eds. W. Sturges and A. Lugo-Fernandez. American Geophysical Union, pp. 279-294.
    74. L.-Y. Oey, T. Ezer, G. Forristall, C. Cooper, S. F. DiMarco, and S. Fan, 2005. An exercise in forecasting loop current and eddy frontal positions in the Gulf of Mexico. Geophys. Res. Lett., 32, L12611, doi:10.1029/2005GL023253.
    75. ‡L. Sindlinger, D.C. Biggs, and S. F. DiMarco, 2005. ADCP Backscatter Measurements as Proxy for zooplankton and micronecton biomass in the northeastern Gulf of Mexico. Continental Shelf Research 25, 259-275.
    76. P. Chapman, S. F. DiMarco, R. E. Davis, and A. C. Coward, 2003. Flow at intermediate depths around Madagascar based on ALACE float trajectories.  Deep-Sea Research II 50, 1957-1986.
    77. J. W. Morse, S. F. DiMarco, K. S. Sell, and A. B. Hebert, 2003. Determination of the optimum sampling intervals in sediment pore waters using the autocovariance function.  Aquatic Geochemisty, 9: 41-57.
    78. J. W. Morse, S. F. DiMarco, A. Hebert, and K. Sell, 2003. A scaling approach to spatial variability in early diagenetic processes. Hydrobiologia 494: 25-29.
    79. S. F. DiMarco, P. Chapman, W. D. Nowlin, Jr., P. Hacker, K. Donohue, M. Luther, G. Johnson, and J. Toole, 2002.Volume and property distributions of the Mozambique Channel. Deep-Sea Research Part II, 49, 1481-1511.
    80. S. F. DiMarco, E. Meza Conde, and J. Zhang, 2001. Estimating wave elevation from pressure using second-order nonlinear wave-wave interaction theory with applications to Hurricane Andrew, J. Coastal Research 17(3), 657-671.
    81. S. F. DiMarco, P. Chapman, and W. D. Nowlin, Jr., 2000. Satellite observations of upwelling on the continental shelf south of Madagascar. Geophysical Research Letters. 27(24), 3965-3968.
    82. S. F. DiMarco, M. K. Howard, and R. O. Reid, 2000. Seasonal variation of wind-driven diurnal cycling on the Texas-Louisiana continental shelf. Geophysical Research Letters 21(7), 1017-1020.
    83. W. J. Wiseman, Jr., M. Inoue, R. Patchen, V. Ranisbrahmanakul, S. P. Murray, and S. DiMarco, 2000. Hydrography of the Louisiana Coastal Current: Model-Data Comparison. Interactions between Estuaries, Coastal Seas, and Shelf Seas, Ed. T. Yanagi, Terra Scientific Publishing Company (TERRAPUB), Tokyo. pp. 287-302.
    84. W. D. Nowlin, Jr., A. E. Jochens, M. K. Howard, S. F. DiMarco, and W. W. Schroeder. 2000. Hydrographic properties and inferred circulation over the northeastern shelves of the Gulf of Mexico during spring and mid-summer 1998. Gulf of Mexico Science, 18(1), 40-54.
    85. S. F. DiMarco and R. O. Reid, 1998. Characterization of the Principal Tidal Current Constituents on the Texas-Louisiana Shelf, J. Geophysical Research - Oceans, 103(2), 3093-3109.
    86. S.F. DiMarco, F. J. Kelly, Jun Zhang, and Norman L. Guinasso, Jr., 1995. Directional Wave Spectra on the Louisiana-Texas Shelf During Hurricane Andrew, Journal of Coastal Research, SI-21, 217-233.
    87. S.F. DiMarco and C. D. Cantrell, 1991. "Parametric pulse breakup due to population pulsations in three-level systems". In Nonlinear Optics and Materials, Proceedings of the SPIE Vol. 1497 (edited by C.D. Cantrell and C. M. Bowden). Pp. 178-187, 1991.

     

    Book Chapters and Atlas

    • DiMarco, S.F., and Knap, A.H. (2018) Coastal Ocean Observing Systems for the 21st Century, Chapter 4: In Advances in Coastal Hydraulics (Panchang, V. and Kaihatu, J. eds) World Scientific, 524p. (Pp. 111-143)
    • S.F. DiMarco and H.M. Zimmerle, 2017. MCH Atlas: Oceanographic Observations of the Mechanism Controlling Hypoxia Project. Texas A&M University, Texas Sea Grant Publication TAMU-SG-17-601. Pp. 350. ISBN: 978-0-692-87961-0. http://mchatlas.tamu.edu 
    • S.F. DiMarco, 2017. MetOcean Parameters and Processes. Encyclopedia of Maritime and Offshore Engineering. Edited by John Carlton, Yoo Sang, and Paul Jukes. John Wiley and Sons, Ltd. ISBN: 978-1-118-47635-2. DOI: 10.1002/9781118476406.emoe127. Pages 127.1-126.16. http://onlinelibrary.wiley.com/doi/10.1002/9781118476406.emoe127/full 
    • Data Publications (citable):
    • DiMarco, Steven F. (2012). Physical and chemical data collected by bottle and CTD in the Gulf of Mexico from the R/V Gyre and R/V Pelican, April 2004 - July 2009 to help resolve the dominant oceanographic processes that control the timing, duration, and severity of hypoxia of the region (NCEI Accession 0088164). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/rtbv-yv17. Accessed [date]. Data files collected during the Mechanisms Controlling Hypoxia Project (years 2003-2009) were submitted (March 2012) to the National Oceanographic Data Center, Silver Spring, MD http://ncei.noaa.gov. Accession Number 0088164. Submission contains 1065 CTD profiles (probes include temperature, conductivity (salinity), pressure, fluorometer, optical backscatter, light transmission, photosynthetically active radiation, dissolved oxygen, and 7133 bottle samples that include nutrients, dissolved oxygen, and salinity.
    • DiMarco, Steven F. (2021). Physical and biogeochemical CTD, ADCP, and towed vehicle data collected for the Mechanisms Controlling Hypoxia Project in the northern Gulf of Mexico from 2010-04-06 to 2014-08-12. (NCEI Accession 0240146). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/e0vh-da33. Accessed [date]. Physical and biogeochemical CTD, ADCP, and towed vehicle data collected for the Mechanisms Controlling Hypoxia Project in the northern Gulf of Mexico from 2010-04-06 to 2014-08-12. (NCEI Accession 0240146).
    • DiMarco, Steve. 2016. Shipboard ADCP, underway near surface meteorology and hydrography, G09 cruise, south of the Mississippi River Delta in April 2015 from the R/V Pelican cruise PE15-21. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7TH8JRJ.
    • DiMarco, Steve. 2016. Shipboard ADCP, underway near surface meteorology and hydrography, G06 cruise, Deepwater Horizon oil spill region, June 25 to July 2 2014. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7Q23X9Z
    • DiMarco, Steven F. 2016. Hydrographic and chemical measurements from the GISR: G09 Field Study cruise, south of the Mississippi River Delta over the continental slope and rise in the Greens Canyon 600 lease block in April 2015 from the R/V Pelican cruise 15PE21. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7Z60M3Z
    • Steven DiMarco. 2016. Hydrographic and chemical measurements from the GISR: G06 Field Study and Mooring Deployment Cruise off the Mississippi River Delta in June-July 2014. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N70G3H5T
    • DiMarco, Steven. 2014. CTD profiles, G04 field survey, DeepWater Horizon oil spill region, July 2013.. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N75M63PN.
    • DiMarco, Steven. 2014. Ocean current, temperature and salinity time series, G04 moorings, DeepWater Horizon oil spill region, July 2012 to July 2013. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7930R44
    • DiMarco, Steven. 2016. Ocean current, temperature and salinity time series, G06 moorings, DeepWater Horizon oil spill region, July 2013 to July 2014. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7G15XWT
    • DiMarco, Steven. 2014. Shipboard ADCP, underway near surface meteorology and hydrography, G04 cruise, Deepwater Horizon oil spill region, July 2013. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N71Z42CN
    • Chapman, Piers, and Steven DiMarco. 2013. Hydrographic and chemical measurements from the GISR: G01 Field Study and Mooring Deployment Cruise off the Mississippi River Delta in July 2012. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7F47M38
    • Chapman, Piers, and Steven DiMarco. 2013. Shipboard ADCP measurements from the GISR: G01 Field Study and Mooring Deployment Cruise off the Mississippi River Delta in July 2012. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7J38QJ9
    • Chapman, Piers, and Steven DiMarco. 2015. Near-surface oceanographic and meteorological measurements from the GISR: G01 Field Study and Mooring Deployment Cruise off the Mississippi River Delta in July 2012.. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N79C6VCJ
    • Wang, Binbin, and Steven F. DiMarco. 2020. Particle Image Velocimetry (PIV) data of bubble plumes with different bubble sizes generated by two different diffusers. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/5X39MDW7
    • Wang, Binbin, and Steven F. DiMarco. 2020. Bubble images in laboratory-generated bubble plumes using two different diffusers. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/2A2VPRM4
    • Kurt Polzin, Zhankun Wang, Steve DiMarco. 2020. Oceanographic profiles from CTD casts and tow-yos collected from the R/V Point Sur during GoMix I cruise (PS17_06) in the northern Gulf of Mexico from 2016-09-19 to 2016-09-27. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-zkef-0305
    • Kurt Polzin, Zhankun Wang, Steven F. DiMarco. 2020. Ocean currents measured by Shipboard Acoustic Doppler Current Profilers (SADCP) during the R/V Point Sur cruise PS17_06 in the northern Gulf of Mexico from 2016-09-18 to 2016-09-27. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-s349-9222
    1. DiMarco, Z. Wang and K. Polzin. 2020. Slocum glider data and turbulence data collected by TAMU glider unit 541 aboard R/V Point Sur during the GoMix III cruise (PS18-28) in the northern Gulf of Mexico from 2018-05-09 to 2018-06-14. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/YYJ23NN5
    2. DiMarco, Z. Wang and K. Polzin. 2020. Slocum glider and turbulence data collected by TAMU glider unit 541 aboard R/V Point Sur during the GoMix II cruise (PS18-06) in the northern Gulf of Mexico from 2017-08-21 to 2017-09-09. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-2rgy-ny75
    3. DiMarco, Z. Wang and K. Polzin. 2020. Slocum glider and turbulence data collected by TAMU glider unit 308 aboard R/V Point Sur during the GoMix I cruise (PS17-06) in the northern Gulf of Mexico from 2016-09-02 to 2016-09-09. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-js35-h386
    • Kurt Polzin, Zhankun Wang, Steven F. DiMarco. 2020. Ocean currents measured by Shipboard Acoustic Doppler Current Profilers (SADCP) during the R/V Point Sur cruise PS18-06 in the northern Gulf of Mexico from 2017-08-17 to 2017-09-04. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-yrq6-pk81
    • Kurt Polzin, Zhankun Wang, Steven F. DiMarco. 2019. Oceanographic profiles from CTD casts collected during the R/V Point Sur cruise PS18-06 in the northern Gulf of Mexico from 2017-08-17 to 2017-09-03. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-8n2d-by19
    • Kurt Polzin, Zhankun Wang and Steven F. DiMarco. 2020. Ocean currents measured by Shipboard Acoustic Doppler Current Profilers (SADCP) during the R/V Point Sur cruise PS18_28 in the northern Gulf of Mexico from 2018-06-21 to 2018-06-28. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/FXZ7KG60
    • Kurt Polzin, Zhankun Wang and Steven F. DiMarco. 2020. Oceanographic profiles from CTD casts and tow-yos collected from the R/V Point Sur during GoMix Cruise III (PS18_28) in the northern Gulf of Mexico from 2018-06-22 to 2018-06-28. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/M8B3B9QN
    • Polzin, Kurt, Steven F. DiMarco, Zhankun Wang, and Binbin Wang. 2020. GoMix II mooring data, northern Gulf of Mexico, R/V Point Sur (PS18_06), 2017-08-18 - 2018-03-03. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-s1d5-rn83
    • Polzin, Kurt; DiMarco, Steven F.; Wang, Zhankun; Wang, Binbin. 2020. GoMix I mooring data, northern Gulf of Mexico, 2016-09-18 to 2017-08-18. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-8avq-ar61
    • DiMarco, Steven F., Kurt Polzin, Zhankun Wang, and Binbin Wang. 2020. Mooring data at 150 m collected aboard R/V Point Sur during the GoMix III cruise (PS18-28) in the northern Gulf of Mexico from 2018-06-22 to 2018-10-05. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/F44H7RFM
    • Campbell, L., Knap, A. (2019) Hydrographic, nutrient and oxygen data from CTD bottles during R/V Pelican cruises from 2016-06-29 to 2018-06-24. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2019-01-28 [if applicable, indicate subset used]. doi:10.1575/1912/bco-dmo.753882.1 [access date]. SF DiMarco Point Of Contact.
    • Campbell, L., Knap, A., DiMarco, S., Henrichs, D. W. (2021) CTD profile data from R/V Pt. Sur PS 18-09 Legs 01 and 03, Sept. - Oct. 2017. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2020-04-15 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.809428.1 [access date].
    • Campbell, L., and Henrichs, D. (2019) Hydrographic, nutrient and oxygen data from CTD bottles and beam transmission and fluorescence data from CTD profiles during R/V Point Sur PS1809 (HRR legs 1, 2, 3) at the Gulf Mexico, Louisiana and Texas coast, Sept-Oct 2017. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2019-12-12 [if applicable, indicate subset used]. doi:10.1575/1912/bco-dmo.784290.1 [access date]. SF DiMarco Point of Contact.
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