Wei-Jun Cai, Co-Principal Investigator / Associate Professor
Because precise measurements of the fluxes of all categories of living and non-living organic matter are difficult to achieve, we propose to reevaluate the question of estuarine (coastal ocean)-marsh interactions from the viewpoint of O2 and CO2 exchanges between marsh, estuary, and atmosphere. Our approach uses O2 and CO2 concentrations in estuarine waters as integrated measurements of production, respiration, and gas exchange in the estuary/intertidal marsh complex. By examining overall gas exchanges and evaluating them in the context of a mass-balance model, we also provide a valuable comparison with individual measurements of specific processes in the coastal marshes that span several decades.
GCE Flux Tower Committee
Primary Organization: University of Delaware
Dr. Wei-Jun Cai
Office Phone: (302) 831-2839
Other Identity Systems:
GCE Data Sets:
CHM-GCET-1605a (Anchor sampling of inorganic carbon (DIC) and dissolved oxygen (DO) at the flux tower tidal creek in the Duplin River)
CHM-GCET-1605 (Survey of dissolved inorganic carbon (DIC) and dissolved oxygen (DO) along the Duplin River in 2014)
NUT-GCEM-0909b (Long-term water quality monitoring on the Altamaha River and major tributaries from September 2000 through April 2009)
CHM-GCEM-0501 (Surface water DIC, total alkalinity, and pH for the September 2002 through December 2004 Georgia Coastal Ecosystems LTER oceanographic surveys)
CHM-GCED-0303b (Surface water DIC, total alkalinity, and pH for the June 2001 Georgia Coastal Ecosystems LTER oceanographic survey)
(most recent displayed - view all)
GCE Publications and Presentations: (custom bibliography)
Herrmann, M., Najjar, R.G., Kemp, M., Alexander, R.B., Boyer, E.W., Cai, W.-J., Griffith, P.C., Kroeger, K.D., McCallister, S.L. and Smith, R.A. 2015. Net ecosystem production and organic carbon balance of U.S. East Coast estuaries: A synthesis approach. Global Biogeochemical Cycles. 29(1):96-111. (DOI: 10.1002/2013GB004736)
Jiang, L., Cai, W.-J., Wang, Y. and Bauer, J. 2013. Influence of terrestrial inputs on continental shelf carbon dioxide. Biogeosciences. 10:839 - 849. (DOI: 10.5194/bg-10-839-2013)
Hopkinson, C.S., Cai, W.-J. and Hu, X. 2012. Carbon sequestration in wetland dominated coastal systems — aglobal sink of rapidly diminishing magnitude. Current Opinions in Environmental Sustainability. 4:186 - 194. (DOI: 10.1016/j.cosust.2012.03.005)
Cai, W.-J. 2011. Estuarine and Coastal Ocean Carbon Paradox: CO2 Sinks or Sites of Terrestrial Carbon Incineration? Annual Review of Marine Science. 3:123-145. (DOI: 10.1146/annurev-marine-120709-142723)
Cai, W.-J., Hu, X., Huang, W.-J., Jiang, L., Wang, Y. and Peng, T.-H. 2010. Alkalinity distribution in the western North Atlantic Ocean margins. Journal of Geophysical Research. 115(C08014):15. (DOI: 10.1029/2009JC005482)
Jiang, L., Cai, W.-J., Feely, R.A., Wang, Y., Guo, X., Gledhill, D.K., Hu, X., Arzayus, F., Chen, F., Hartmann, J. and Zhang, L. 2010. Carbonate mineral saturation states along the U.S. east coast. Limnology and Oceanography. 55(6):2424–2432. (DOI: 10.4319/lo.2010.55.6.2424)
Jiang, L., Cai, W.-J., Wang, Y., Diaz, J., Yager, P. and Hu, X. 2010. Pelagic community respiration on the continental shelf off Georgia, USA. Biogeochemistry. 98:101–113. (DOI: 10.1007/s10533-009-9379-8)
Jiang, L., Cai, W.-J., Wang, Y., Wanninkhof, R. and Luger, H. 2008. Air-sea CO2 fluxes on the US South Atlantic Bight: Spatial and temporal variability. Journal of Geophysical Research-Ocean. 113:C07019. (DOI: 10.1029/2007JC004366)
Cai, W.-J., Dai, M. and Wang, Y. 2006. Air-sea exchange of carbon dioxide in ocean margins: A province-based synthesis. Geophysical Research Letters. 33:L12603. (DOI: 10.1029/2006GL026219)
Wang, Z., Cai, W.-J., Wang, Y. and Ji, H. 2005. The southeastern continental shelf of the United States as an atmospheric CO2 source and an exporter of inorganic carbon to the ocean. Continental Shelf Research 25:1917-1941.
Cai, W.-J. and Dai, M. 2004. Comment on "Enhanced open ocean storage of CO2 from shelf sea pumping". Science. 306:1477c.
Cai, W.-J., Dai, M., Wang, Y., Zhai, W., Chen, T.H.S., Zhang, F., Chen, Z. and Wang, Z. 2004. The biogeochemistry of inorganic carbon and nutrients in the Pearl River estuary and the adjacent Northern South China Sea. Continental Shelf Research. 24:1301-1319.
Wang, Z. and Cai, W.-J. 2004. Carbon dioxide degassing and inorganic carbon export from a marsh dominated estuary (the Duplin River): A marsh CO2 pump. Limnology & Oceanography. 49(2):341-352.
Cai, W.-J. 2003. Riverine inorganic carbon flux and rate of biological uptake in the Mississippi River plume. Geophysical Research Letters. 30(2):1032-1035.
Cai, W.-J., Wang, Y., Krest, J. and Moore, W.S. 2003. The geochemistry of dissolved inorganic carbon in a surficial groundwater aquifer in North Inlet, South Carolina and the carbon fluxes to the coastal ocean. Geochimistry Cosmochimistry Acta. 67(5):631-637.
Cai, W.-J., Wang, Z. and Wang, Y. 2003. The role of marsh-dominated heterotrophic continental margins in transport of CO2 between the atmosphere, the land-sea interface and the ocean. Geophysical Research Letters. 30(16):1849.
Wang, Z.A., Cai, W.-J., Wang, Y. and Upchurch, B.L. 2003. A long pathlength liquid-core waveguide sensor for real-time pCO2 measurements at sea. Marine Chemistry. 84:73–84.
Cai, W.-J., Wiebe, W.J., Wang, Y. and Sheldon, J.E. 2000. Intertidal marsh as a source of dissolved inorganic carbon and a sink of nitrate in the Satilla River-estuarine complex in the southeastern U.S. Limnology & Oceanography. 45:1743-1752.
Books and Book Sections
Pennings, S.C., Alber, M., Alexander, C.R. Jr., Booth, M.G., Burd, A.B., Cai, W.-J., Craft, C.B., DePratter, C., Di Iorio, D., Hollibaugh, J.T., Hopkinson, C.S., Joye, S.B., Meile, C., Moore, W.S., Silliman, B.R., Thompson, V.D. and Wares, J.P. 2012. South Atlantic Tidal Wetlands. Pages 45-61 in: Batzer, D.P. and Baldwin, A. (editors). Wetland Habitats of North America: Ecology and Conservation Concerns. University of California Press, Berkeley, California.
Pomeroy, L.R. and Cai, W.-J. 2006. Oxygen, carbon dioxide, and estuarine condition. Pages 179-201 in Kleppel, G.S., DeVoe, M.R. and Rawson, M.V. (editors). Changing Land Use Patterns in the Coastal Zone: Managing Environmental Quality in Rapidly Developing Regions. Springer, New York.
This material is based upon work supported by the National Science Foundation under grants OCE-9982133, OCE-0620959 and OCE-1237140. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.