[Coral-List] SOCAN webinar: "Estuarine Acidification: A Conceptual Discussion with Examples"
George Sedberry - NOAA Federal
george.sedberry at noaa.gov
Mon Mar 16 09:11:18 EDT 2015
"Estuarine Acidification: A Conceptual Discussion with Examples"
University of Delaware
Please join SOCAN for our next webinar Wednesday March 18, 12pm ET. It is
titled "Estuarine Acidification: A Conceptual Discussion with Examples"
presented by Wei-Jun Cai, University of Delaware.
Wei-Jun Cai will discuss how estuarine pH is affected by mixing between
riverine and anthropogenic carbon dioxide (CO2) enriched seawater and by
respiration under various conditions (salinity, temperature and river
end-member alkalinity). A few rivers with different levels of weathering
products and temperature are selected for the discussion. It is shown here
that estuaries receiving low to moderate levels of weathering products
exhibit maximum pH decrease in mid-salinity region as a result of
anthropogenic CO2 intrusion. Such maximum pH decrease coincides with a
mid-salinity minimum buffer zone. In addition, water column oxygen
consumption can further depress pH for all simulated estuaries. Recognition
of the estuarine minimum buffer zone may be important for studying
estuarine calcifying organisms and pH-sensitive biogeochemical processes.
Dr. Cai has worked on marine carbon cycling for twenty years. His research
areas include calcium carbonate (CaCO3) dissolution and sediment diagenesis
in the deep sea using microelectrodes (O2, pH and pCO2), air-sea exchange
of CO2 and carbon cycling in coastal oceans. Most recently, his research
has focused on the responses of coastal ocean carbon cycles and ecosystems
to a changing terrestrial export of carbon and nutrients as well as
bottom-water acidification in estuaries and coastal oceans.
NOAA Office of National Marine Sanctuaries
10 Ocean Science Circle
Savannah GA 31411
Office: 912 598 2439
Mobile: 912 308 5193
Email: george.sedberry at noaa.gov
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