1. A comparison of CO 2 dynamics and air‐water fluxes in a river‐dominated estuary and a mangrove‐dominated marine estuary
- Author
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S. B. Choudhury, Khan M. G. Mostofa, Tatsuki Tokoro, Rajdeep Roy, K. H. Rao, Tomohiro Kuwae, Sudip Manna, Kunal Chakraborty, Anirban Akhand, Abhra Chanda, Sourav Das, Sugata Hazra, Rik Wanninkhof, and Vinay Kumar Dadhwal
- Subjects
0106 biological sciences ,geography ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,010604 marine biology & hydrobiology ,Estuary ,Monsoon ,01 natural sciences ,Sink (geography) ,Salinity ,Blue carbon ,Geophysics ,Oceanography ,General Earth and Planetary Sciences ,Environmental science ,Fugacity ,Mangrove ,Surface runoff ,0105 earth and related environmental sciences - Abstract
The fugacity of CO2 [fCO2 (water)] and air-water CO2 flux were compared between a river-dominated anthropogenically disturbed open estuary, the Hugli and a comparatively pristine mangrove dominated semi-closed marine estuary, the Matla on the east coast of India. Annual mean salinity of the Hugli Estuary (≈ 7.1) was much less compared to the Matla Estuary (≈ 20.0). All the stations of the Hugli Estuary were highly supersaturated with CO2 (annual mean ~ 2200 µatm) whereas, the Matla was marginally oversaturated (annual mean ~ 530 µatm). During the post-monsoon season, the outer station of the Matla Estuary was under saturated with respect to CO2 and acted as a sink. The annual mean CO2 emission from the Hugli Estuary (32.4 mol C m-2 yr-1) was 14 times higher than the Matla Estuary (2.3 mol C m-2 yr-1). CO2 efflux rate from the Hugli Estuary has increased drastically in the last decade, which is attributed to increased runoff from the river-dominated estuary.
- Published
- 2016
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