A comparison of CO sub(2) dynamics and air-water fluxes in a river-dominated estuary and a mangrove-dominated marine estuary

The fugacity of CO sub(2) (fCO sub(2) (water)) and air-water CO sub(2) flux were compared between a river-dominated anthropogenically disturbed open estuary, the Hugli, and a comparatively pristine mangrove-dominated semiclosed marine estuary, the Matla, on the east coast of India. Annual mean salin...

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Bibliographic Details
Published in:Geophysical research letters 2016-11, Vol.43 (22), p.11-735
Main Authors: Akhand, Anirban, Chanda, Abhra, Manna, Sudip, Das, Sourav, Hazra, Sugata, Roy, Rajdeep, Choudhury, S B, Rao, KH, Dadhwal, V K, Chakraborty, Kunal, Mostofa, KMG, Tokoro, T, Kuwae, Tomohiro, Wanninkhof, Rik
Format: Article
Language:English
Subjects:
Brackish
Carbon dioxide
Coastal environments
Efflux
Estuaries
Estuarine environments
Fluxes
Salinity
Stations
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Summary:The fugacity of CO sub(2) (fCO sub(2) (water)) and air-water CO sub(2) flux were compared between a river-dominated anthropogenically disturbed open estuary, the Hugli, and a comparatively pristine mangrove-dominated semiclosed marine estuary, the Matla, on the east coast of India. Annual mean salinity of the Hugli Estuary ( approximately 7.1) was much less compared to the Matla Estuary ( approximately 20.0). All the stations of the Hugli Estuary were highly supersaturated with CO sub(2) (annual mean~2200 mu atm), whereas the Matla was marginally oversaturated (annual mean~530 mu atm). During the postmonsoon season, the outer station of the Matla Estuary was under saturated with respect to CO sub(2) and acted as a sink. The annual mean CO sub(2) emission from the Hugli Estuary (32.4molCm super(-2)yr super(-1)) was 14 times higher than the Matla Estuary (2.3molCm super(-2)yr super(-1)). CO sub(2) efflux rate from the Hugli Estuary has increased drastically in the last decade, which is attributed to increased runoff from the river-dominated estuary. Key Points * River-dominated Hugli Estuary emits 14 times more CO sub(2) than the marine-dominated Matla Estuary * In the last 14years the CO sub(2) efflux rate from the Hugli Estuary has increased more than twofold * The fCO sub(2) (water) value of the Matla, a mangrove estuary, is at the lower end of the reported data from other mangrove ecosystems of the world
ISSN:0094-8276
1944-8007
DOI:10.1002/2016GL070716