Oregon State University

College of Earth, Ocean, and Atmospheric Sciences

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Nancy Williams

Nancy Williams photo
Ph.D. Graduate Student
Degree Major: Ocean, Earth, and Atmospheric Sciences
Major Professor/Advisor(s): Laurie Juranek
Discipline: Ocean Ecology and Biogeochemistry
Office: Burt 380
Email: willinan@oregonstate.edu
Vita or Résumé


ocean carbon, southern ocean, anthropogenic change, analytical chemistry, ocean acidification

Current Research

I am currently working on the Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) project which aims to fill observational gaps by deploying 200 autonomous biogeochemical profiling Argo floats in the Southern Ocean over five years.  These floats are equipped with biogeochemical sensors including pH, oxygen, nitrate, fluorescence, and backscattering and provide water column data at 10-day intervals throughout all seasons and even under sea ice.  My role within SOCCOM is to leverage this novel pH sensor data with existing observations to learn as much as possible about the Southern Ocean's role in the ocean carbon cycle. The data generated by SOCCOM will be used to improve climate models and to inform future observational system design.


M.S. Oceanography, University of Washington, 2014, Advised by Dr. Richard Feely and Dr. Christopher Sabine

B.S. Chemistry and Marine Science, University of Miami, 2008, Honors thesis work with Dr. Frank Millero


Williams, N. L., Juranek, L. W., Feely, R. A., Russell, J. L., & Dunne, J., in prep. Future changes in carbonate chemistry in the Southern Ocean under ocean acidification using insights from SOCCOM biogeochemical floats. Journal TBD.

Talley, L. D., Rosso, I., Kamenkovich, I., Mazloff, M. E., Wang, J., Boss, E., Gray, A. R., Johnson, K. S., Key, R., Riser, S. C., Williams, N. L., and J. L. Sarmiento, in review. Southern Ocean biogeochemical float deployment strategies, with example from the Greenwich Meridian line (GO-SHIP A12). Journal of Geophysical Research: Oceans SOCCOM Special Issue.

Gray, A. R., Johnson, K. S., Bushinsky, S. M., Riser, S. C., Russell, J. L., Talley, L. D., Wanninkhof, R., Williams, N. L., and J. L. Sarmiento, in review.  Autonomous biogeochemical floats detect significant carbon dioxide outgassing in the high-latitude Southern Ocean. Geophysical Research Letters.

Bittig, H. C., T. Steinhoff, H. Claustre, B. Fiedler, N. L. Williams, A. Körtzinger, and J.-P. Gattuso, in review. CONTENT: Improved estimates of open ocean CO2 parameters from T, S, and O2 data for underway and profile applications, Frontiers in Marine Science.

Williams, N. L., Feely, R. A., Juranek, L. W., Russell, J. L., K. S. Johnson, and B. Hales, in review. Assessment of the carbonate chemistry seasonal cycles in the Southern Ocean from persistent observational platforms. Journal of Geophysical Research: Oceans SOCCOM Special Issue.

Fay, A. R., N. S. Lovenduski, G. A. McKinley, D. R. Munro, C. Sweeney, A. R. Gray, P. Landschützer, B. Stephens, T. Takahashi, and N. Williams. in review. Utilizing the Drake Passage Time-series to understand variability and change in subpolar Southern Ocean pCO2Biogeosciences, doi: 10.5194/bg-2017-489.

Carter, B. R., Feely, R. A., Williams, N. L., Dickson, A. G., Fong, M. B., and Y. Takeshita, 2017. Updated methods for global locally interpolated estimation of alkalinity, pH, and nitrate. Limnol. Oceanogr. Methods. doi:10.1002/lom3.10232

Johnson, K. S., Plant, J. N., Coletti, L. J., Jannasch, H. W., Sakamoto, C. M., Riser, S. C., Swift, D. D., Williams, N. L., Boss, E. Haëntjens, N., Talley, L. D., and J. L. Sarmiento, 2017. Biogeochemical sensor performance in the SOCCOM profiling float array. Journal of Geophysical Research: Oceans, 122(8), 6416–6436. doi:10.1002/2017JC012838

Williams, N. L., Juranek. L. W., Feely, R. A., Johnson, K. S., Sarmiento, J. L., Talley, L. D., Dickson, A. G., Gray, A., Wanninkhof, R., Russell, J. L., and S. C. Riser, 2017. Calculating surface ocean pCO2sw from biogeochemical Argo floats equipped with pH: an uncertainty analysis.  Global Biogeochemical Cycles, 31(3), 591-604. doi:10.1002/2016GB005541

Williams, N. L., Juranek, L. W., Johnson, K. S., Feely, R. A., Riser, S. C., Talley, L. D., Russell, J. L., Sarmiento, J. L., and R. Wanninkhof, 2016. Empirical Algorithms to Estimate Water Column pH in the Southern Ocean.  Geophysical Research Letters. doi:10.1002/2016GL068539

Carter, B., Williams, N. L., Feely, R. A., Gray, A., 2016. Locally Interpolated Alkalinity Regression for Global Alkalinity Estimation, Limnology and Oceanography: Methods. doi:10.1002/lom3.10087

Wanninkhof, R., Johnson, K., Williams, N., Sarmiento, J., Riser, S., Briggs, E., … Verdy, A., 2016. An evaluation of pH and NO3 sensor data from SOCCOM floats and their utilization to develop ocean inorganic carbon products: A summary of discussions and recommendations of the Carbon Working Group (CWG) of SOCCOM. Retrieved from http://soccom.princeton.edu/sites/default/files/files/CWG_white_paper_March_13_2016.pdf

Williams, N. L., Feely, R. A., Sabine, C. L., Dickson, A. D., Swift, J. H., Talley, L. D., and J. L. Russell, 2015. Quantifying Anthropogenic Carbon Inventory Changes in the Pacific Sector of the Southern Ocean. Marine Chemistry, 174, 147-160. doi:10.1016/j.marchem.2015.06.015

Millero, F. J., Chanson, M., Mathis, J., Williams, N. L., and A. J. Abrams, 2007. Global Ocean Repeat Hydrography Study: pH and Total Alkalinity Measurements in the Indian Ocean I9N 22nd March- 1st May 2007, University of Miami Technical Report, No. RSMAS-2007-01.

Millero, F. J., Huang, F., Williams, N., Waters, J., and R. Woosley, 2009. The effect of composition on the density of South Pacific Ocean waters, Marine Chemistry, 114, 56-62. doi:10.1016/j.marchem.2009.04.001

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