Samantha Siedlecki

(Ph.D., University of Chicago) Assistant Professor of Marine Sciences

As a biogeochemical oceanographer, I focus on coastal regions where I investigate interdisciplinary processes within that environment controlling the carbon dynamics. The coastal ocean is the most productive region in the world’s oceans, is the locus for nearly 90% of global organic carbon burial, provides habitat for major fisheries, and makes global climate change issues local. I look at models as tools that integrate observations and theory. They can be used to investigate processes and mechanisms, or to try and understand future scenarios. I create and modify representations of biogeochemistry within numerical circulation models. My research questions address the interplay of physics and biogeochemical processes, including carbon, in the coastal zone. My current research is largely centered on forecasting and ocean acidification. However, in determining what is important to get right to improve forecasts, I am also identifying key processes that control biogeochemical cycles in coastal waters.




Enhancement of an existing ocean forecast system to include ocean acidification (NOAA OAP)

Evaluating Local Impacts of Ocean Acidification on the U.S. West Coast (Wendy Schmidt Foundation)

Downscaled seasonal forecasts for living marine resource management off the US west coast (NOAA MAPP)

Experiments with Seasonal Forecasts of ocean conditions in the Pacific Northwest to aid the crab fishery (NOAA -MAPP)

Short-term forecasting of Pacific hake distribution in the California Current Ecosystem (NOAA-FATE)

Development of an Ocean Acidification forecast model (LiveOcean, Washington Ocean Acidification Center)


Bednaršek, N., R.A. Feely, N. Tolimieri, A.J. Hermann, S.A. Siedlecki, H.O. Pörtner, G.G. Waldbusser, P. McElhany, S.R. Alin, and J. Menkel (2017): Exposure history determines pteropod vulnerability to ocean acidification along the US West Coast. Scientific Reports 7, Article number: 4526,  doi:10.1038/s41598-017-03934-z

Carter, B.R., Feely, R.A., Mecking, S., Cross, J. N., Macdonald, A.M., Siedlecki, S.A. Talley, L., Sabine, C. L., Millero, R., Swift, J.H. , and Dickson, A. G.,  (2017) Two Decades of Pacific Anthropogenic Carbon Storage and Ocean Acidification Along GO-SHIP Sections P16 and P02, Global Biogeochem. Cycles, 31, doi:10.1002/2016GB005485.

Tommasi, D., Stock, C., Hobday, A., Methot, R., Kaplan, I., Eveson, P., Holsman, K., Miller, T., Gaichas, S.,  Gehlen, M.,  Pershing, A., Vecchi, G.,  Msadek, R., Delworth, T., Eakin, M., Haltuch, M., Sefarian, R., Spillman, C., Hartog, J., Siedlecki, S.,Samhouri, J., Muhling, B., Asch, R., Pinsky, M.,  Saba, V., Kapnick, S., Gaitan, C.,  Rykaczewski, R., Alexander, M., Xue, Y., Pegion, K.,  Lynch, P.,  Payne, M., Kristiansen, T., Lehodey, P., and C. Werner. (accepted) Managing living marine resources in a dynamic environment: the role of seasonal to decadal climate forecasts, Progress in Oceanography

S. McClatchie, A. R. Thompson, S. R. Alin, S. J. Bograd, S.A. Siedlecki, W. Watson, (2016) The influence of Pacific Equatorial Water on fish diversity in the southern California Current System, JGR-Oceans, doi:10.1002/2016JC011672

Siedlecki, S.A., Kaplan, I.C., Hermann, A., Nguyen, T., Bond, N., Williams, G., Newton, J., Peterson, W. T., Alin, S., and R.A. Feely (2016) Experiments with Seasonal Forecasts of ocean conditions for the Northern region of the California Current upwelling system, Nature: Scientific Reports 6, doi:10.1038/srep27203

Harrison, C.S., Hales, B., Siedlecki, S.A., and Samelson, R.M., Potential and timescales for oxygen depletion in coastal upwelling systems: Idealized model analysis (2016) JGR-Oceans 121, doi:10.1002/2015JC011328.

Kaplan, I. C., Williams, G. D., Bond, N. A., Hermann, A. J. and Siedlecki, S. A. (2016), Cloudy with a chance of sardines: forecasting sardine distributions using regional climate models. Fisheries Oceanography, 25: 15–27. doi: 10.1111/fog.12131

Siedlecki, S.A., Banas, N., Davis, K.A., Giddings, S., Hickey, B.M., MacCready, P., Connolly, T., and S. Geier, Seasonal and interannual oxygen variability on the Washington and Oregon continental shelves, (2015), J. Geophys. Res. Oceans, 120, DOI: 10.1002/2014JC010254

Davis, K. A., N. S. Banas, S. N. Giddings, S. A. Siedlecki, P. MacCready, E. J. Lessard, R. M. Kudela, and B. M. Hickey (2014), Estuary-enhanced upwelling of marine nutrients fuels coastal productivity in the U.S. Pacific Northwest, J. Geophys. Res. Oceans, 119, 8778–8799, doi:10.1002/2014JC010248.

Giddings, SN, MacCready, P, Hickey, BM, Banas, NS, Davis, KA, Siedlecki, SA, Trainer, VL, Kudela, RM, Pelland, NA, and Connolly, TP. (2014) Hindcasts of harmful algal bloom transport on the Pacific Northwest coast, JGR-oceans, 119(4), 2439-2461. doi: 10.1002/2013/JC009622.

Siedlecki, SA, Mahadevan, A, and Archer, DE (2012) The Coastal Ocean as a Supplier of Global Iron: Mechanisms for Iron Export in an Upwelling Regime, Geophysical Research Letters 39, DOI:10.1029/2011GL050366

Siedlecki SA, Archer, DE, and Mahadevan, A (2011) Mechanisms for nutrient exchange and ventilation in the coastal ocean: an idealized model for the East Coast of the US, Journal of Geophysical Research – Oceans 116

Loubere P, Siedlecki SA, and Bradtmiller LI (2007) Organic carbon and carbonate fluxes: Links to climate change DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY 54 (5-7): 437-446

Brunner, C.A., Andres, M., Holbourn, A.E., Siedlecki, S., Brooks, G.R., Molina Garza, R.S, Fuller, M.D., Ladner, B.C., Hine, A.C., and Li, Q., 2002. Quaternary planktonic foraminiferal biostratigraphy, ODP Leg 182 sites. In Hine, A.C., Feary, D.A., and Malone, M.J. (Eds.), Proc. ODP, Sci. Results, 182 [Online]. Available from World Wide Web: <>.