Carbon budget in the eastern and central Arabian Sea: An Indian JGOFS synthesis
IR@C-MMACS: CSIR-Centre for Mathematical Modelling and Computer Simulation, Bangalore
View Archive Info| Field | Value | |
| Title |
Carbon budget in the eastern and central Arabian Sea:
An Indian JGOFS synthesis
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| Creator |
P S, Swathi
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| Subject |
Ocean Modelling
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| Description |
The carbon budget for the eastern and central Arabian Sea was constructed using
results from the Modular Ocean Model and biogeochemical data collected largely under
the Indian Joint Global Ocean Flux Study programme. The study region (east of 64_E and
between 11_ and 21_N) was divided into two vertical boxes; a surface box of the top
100 m that largely undergoes exchanges with atmosphere and exhibits relatively strong
seasonal variability and a subsurface box between 100 and 1000 m. Water transport rates
in surface layers were maximal (up to 83 _ 1012 m3) in the southwest monsoon season.
Sinking from surface driven by convection (25 _ 1012 m3) largely supports lateral
outflows of water in subsurface layers in the northeast monsoon. Surface waters are
renewed 10 times faster (t = 0.8 years) than intermediate waters (t = 8 year). A net
supply of 25 Tg C yr_1 is estimated to the upper 1000-m water column of the study area
by the physical pump. Photosynthetic activity (234 Tg C yr_1) does not seem to support
total carbon demands (1203 Tg C yr_1) by bacteria and microzooplankton and
mesozooplankton in the surface layers. Carbon demand rate requires organic carbon
nearly double that of the total living biomass production rate (644 Tg yr_1) suggesting
that most of the demand might be met from internal cycling involving zooplankton
grazing/excretion activities. Sinking flux (69 Tg C yr_1) from surface accounts for about
30% of the total photosynthetic production rate indicating intense remineralization of
organic matter in the surface layers of the Arabian Sea. Grazing and excretion of carbon
by the microzooplankton and mesozooplankton appear to easily sustain perennial
supersaturation of carbon dioxide in surface waters of the Arabian Sea and emission of
32 Tg C yr_1 to the atmosphere.
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| Publisher |
American Geophysical Union
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| Date |
2003
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cir.cmmacs.ernet.in/121/1/sarma_pss.pdf
P S, Swathi (2003) Carbon budget in the eastern and central Arabian Sea: An Indian JGOFS synthesis. Global Biogeochemical Cycles, 17 (4). 13-1-13-13. ISSN ISSN 0886–6236 (Print) ISSN 1944–9224 (Online) |
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| Relation |
http://www.agu.org/journals/gb/
http://cir.cmmacs.ernet.in/121/ |
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