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Indian Journal of Geo-Marine Sciences (IJMS) >
IJMS Vol.41 [2012] >
IJMS Vol.41(2) [April 2012] >
| 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
Nutrient
Mangrove
Sink
Atmosphere |
| Issue Date: | Apr-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Air-water CO2 flux was measured from the gradient of fCO2 (water) and fCO2 (air) in the
Hooghly-Matla estuary to offshore transition zone. An average gas transfer velocity of 10.2 cm h-1 was evaluated
in this region. fCO2
(air) ranged between 275.08 µatm to
459.07 µatm and fCO2 (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 CO2 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 fCO2 and pH reflects a
possible influence of biological activity as well. A maximum efflux rate of
24.56 µmol m-2 h-1 and influx rate of -41.61 µmol m-2
h-1 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-2 h-1. |
| Page(s): | 111-116 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1033 (Online); 0379-5136 (Print) |
| Source: | IJMS Vol.41(2) [April 2012]
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