Scales and drivers of seasonal pCO
2 dynamics and net ecosystem exchange along the coastal waters of southeastern Arabian Sea.
MARINE POLLUTION BULLETIN 2017;
121:372-380. [PMID:
28619629 DOI:
10.1016/j.marpolbul.2017.06.016]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Revised: 05/29/2017] [Accepted: 06/06/2017] [Indexed: 06/07/2023]
Abstract
The impact of seasonal coastal upwelling on the dynamics of dissolved inorganic carbon (DIC) and sea-air fluxes of CO2 along the coastal waters of Kochi was investigated during 2015, as a part of Ecosystem Modelling Project. The surface water pCO2 varied from 396 to 630μatm during the study period. Significant inter-seasonal variations were found in the distribution of physico-chemical variables and surface pCO2. An increase of 102.1μatm of pCO2 was noticed over a two-decade period with a rate of 5.3μatmy-1. There was an agreement between the fluxes of CO2 and net ecosystem production (NEP) with respect to the trophic status while NEP was higher than CO2 fluxes by a factor of 3.9. The annual net ecosystem exchange (NEE) was estimated to be 15.02mmolCm-2d-1 indicating that the coastal waters of Kochi are highly heterotrophic in nature.
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