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Wind-driven lateral variations of partial pressure of carbon dioxide in a large estuary
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2019
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Source: Journal of Marine Systems, 195, 67-73
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Journal Title:Journal of Marine Systems
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Description:Estuarine carbon cycle and biogeochemical studies usually focus on along-estuary variations and neglect cross-estuary variations. In a stratified middle reach of the Chesapeake Bay, we observed a counterclockwise circulation and upwelling of subsurface water with high partial pressure of carbon dioxide (pCO2) on the eastern shoal during a down-estuary wind event from October 24 to 25, 2013. The average air-sea CO2 gas exchange flux over the eastern one-third of this cross transect was approximately 20 to 40% higher, while the flux over the western 1/3 was lower by a similar amount, compared with the middle section. A statistically strong correlation between pCO2 and salinity values was observed, suggesting the presence of a high CO2 source from the higher salinity bottom water. The observations suggest that wind-driven lateral upwelling can enhance the release of respired CO2 from subsurface water in stratified large estuaries by as much as 30% over a short time-scale of hours.
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Source:Journal of Marine Systems, 195, 67-73
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ISSN:0924-7963
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Rights Information:Accepted Manuscript
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