Coupled micrometeorological and biological processes on atmospheric CO 2 concentrations at the land–ocean boundary, NE coast of India
This study reveals that land–sea breezes, atmospheric stability and influence of net ecosystem metabolism for the conversion of organic carbon to atmospheric CO 2 are the major driving forces behind the variation of atmospheric CO 2 at the land–ocean boundary, northeast coast of India. The seasonal...
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Published in | Atmospheric environment (1994) Vol. 45; no. 23; pp. 3903 - 3910 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
2011
|
Subjects | |
Online Access | Get full text |
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Summary: | This study reveals that land–sea breezes, atmospheric stability and influence of net ecosystem metabolism for the conversion of organic carbon to atmospheric CO
2 are the major driving forces behind the variation of atmospheric CO
2 at the land–ocean boundary, northeast coast of India. The seasonal variation of partial pressure of CO
2 (pCO
2) and its efflux from the coastal water were several fold higher in the pre-monsoon (1807.9 ± 757.03 μ atm; 579.03 ± 172.9 μM m
−2 h
−1) than in the monsoon (1070.5 ± 328.5 μ atm; 258.96 ± 185.65 μM m
−2 h
−1) and the post-monsoon (615.7 ± 121.6 μ atm; 53.27 ± 19.24 μM m
−2 h
−1). The mean photic zone productivity to column respiration ratio was 0.12 ± 0.08, revealing predominance of heterotrophic processes. Community respiration was at minimum during monsoon (38.82 ± 8.63 mM C m
−2 d
−1) but was at maximum (173.8 ± 111.8 mM C m
−2 d
−1) during pre-monsoon and intermittent (125.07 ± 11.97 mM C m
−2 d
−1) during post-monsoon. Diurnal variations of atmospheric CO
2 concentration were determined by local air circulations and atmospheric stability. Seasonal variations of atmospheric CO
2 bear a significant signature of biological processes occurring in the coastal water by means of air–sea exchange, markedly affected by the net ecosystem metabolism. Important predictors of coastal atmospheric CO
2 in decreasing order of explained variability are wind direction, stability, CO
2 efflux and wind velocity. |
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ISSN: | 1352-2310 1873-2844 |
DOI: | 10.1016/j.atmosenv.2010.08.047 |