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Title: Air – water carbon dioxide exchange dynamics along the outer estuarine transition zone of Sundarban, northern Bay of Bengal, India
Authors: Akhand, Anirban
Chanda, Abhra
Dutta, Sachinandan
Hazra, Sugata
Keywords: Isobath
Greenhouse Gas
Issue Date: Apr-2012
Publisher: NISCAIR-CSIR, India
Abstract: Air-water CO<sub>2</sub> flux was measured from the gradient of <i style="">f</i>CO<sub>2</sub> (water) and <i style="">f</i>CO<sub>2</sub> (air) in the Hooghly-Matla estuary to offshore transition zone. An average gas transfer velocity of 10.2 cm h<sup>-1</sup> was evaluated in this region. <i style="">f</i>CO<sub>2</sub> (air) ranged between 275.08 µatm to 459.07 µatm and <i style="">f</i>CO<sub>2</sub> (water) varied from 149.1 µatm to 299.2 µatm. Wind velocity and bathymetry (depth) were observed to be the main controlling factors for exchange of CO<sub>2</sub> between the atmosphere and water phase. Seawater is found to have a greater influence at the marine end of the estuary. Apart from physical mixing in this freshwater-sea water interacting zone, the study of <i style="">f</i>CO<sub>2</sub> and pH reflects a possible influence of biological activity as well. A maximum efflux rate of 24.56 µmol m<sup>-2</sup> h<sup>-1 </sup>and influx rate of -41.61 µmol m<sup>-2</sup> h<sup>-1</sup> is determined during high wind velocity. The overall region surveyed was found to behave as a sink during the study period with an average (daytime) influx rate of -14.03 µmol m<sup>-2</sup> h<sup>-1</sup>.
Description: 111-116
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.41(2) [April 2012]

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