| Abstract: |
The distributions of partial pressure of carbon dioxide (pCO(2)) in the surface waters of the Changjiang River Estuary and adjacent Hangzhou Bay were examined in the summer of 2010. Surface water p CO2 ranged from 751-2 095 mu atm (1 atm=101 325 Pa) in the inner estuary, 177-1 036 mu atm in the outer estuary, and 498-1 166 mu atm in Hangzhou Bay. Overall, surface pCO(2) behaved conservatively during the estuary mixing. In the inner estuary, surface pCO(2) was relatively high due to urbanized pollution and a high respiration rate. The lowest pCO(2) was observed in the outer estuary, which was apparently induced by a phytoplankton bloom because the dissolved oxygen and chlorophyll a were very high. The Changjiang River Estuary was a significant-source of atmospheric CO2 and the degassing fluxes were estimated as 0-230 mmol/(m(2).d) [61 mmol/(m(2).d) on average] in the inner estuary. In contrast, the outer estuary acted as a CO(2_)sink.
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