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Abstract
The continental shelf, especially the river-dominated shelf, plays an important role in the global carbon cycle. Thirteen cruises were conducted to measure sea surface salinity, temperature, and partial pressure of carbon dioxide (pCO2) on the Louisiana (LA) shelf, a shelf great influenced by the Mississippi and Atchafalaya River System (MARS) from 2004 to 2010. The result showed that the LA shelf was a sink of atmospheric CO2 , particularly strong on the eastern shelf, with a seasonal variation: strong in spring, weak during summer; shifting to a weak source in fall and back to near equilibrium in winter. In terms of salinity sub-divisions, the small low salinity region (S = 0 to 17) acted as a strong CO2 source to the atmosphere, the wide middle salinity region (17
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