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S SS, Sunny GM, Sherin CK, Vishnu NNS, Reddy B, Sudheesh V, Prachi M, Kumar S, Vijayan AK, Gupta GVM. Variability of particulate organic carbon and assessment of satellite retrieval algorithms over the eastern Arabian Sea. Environ Monit Assess 2022; 194:656. [PMID: 35941250 DOI: 10.1007/s10661-022-10264-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 06/28/2022] [Indexed: 06/15/2023]
Abstract
Particulate organic carbon (POC) and its variability were studied to assess the accuracy of ocean colour retrieval algorithms over the eastern Arabian Sea (EAS) as it controls the carbon sequestration, oxygen minimum zone and biogeochemical (C, N and P) cycles. The seasonality in the physical and biological processes strongly influenced the distribution of POC along the EAS. Higher POC and chlorophyll a (chl a) during the spring inter monsoon (SIM) in the north EAS were due to detrainment bloom. The lower POC:chl a ratios during the winter monsoon (WM) (299.8 ± 190.8) than the SIM (482.1 ± 438.3) were due to the influence of freshly derived organic matter with high nutrient levels. The moderate coefficient of regression values of POC with chl a (R2 = 0.49, N = 59) suggests the importance of dead organic materials in controlling the POC distribution in the EAS. Validation between satellite and in situ POC using the four ocean colour retrieval algorithms showed that the algorithm based on the ratio of remote sensing reflectance (Rrs) performed better (R2 = 0.6, N = 17). It also showed a linear trend of POC with absorption coefficients suggesting it as an optical proxy for the POC retrieval.
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Affiliation(s)
- Shaju S S
- Centre for Marine Living Resources and Ecology, Ministry of Earth Sciences, Kochi, India
- Department of Chemical Oceanography, Cochin University of Science and Technology, Kochi, India
| | | | - C K Sherin
- Centre for Marine Living Resources and Ecology, Ministry of Earth Sciences, Kochi, India
| | - N N S Vishnu
- Centre for Marine Living Resources and Ecology, Ministry of Earth Sciences, Kochi, India
| | - Bikram Reddy
- Centre for Marine Living Resources and Ecology, Ministry of Earth Sciences, Kochi, India
| | - V Sudheesh
- Centre for Marine Living Resources and Ecology, Ministry of Earth Sciences, Kochi, India
- Central University of Kerala, Kasargod, India
| | - M Prachi
- Centre for Marine Living Resources and Ecology, Ministry of Earth Sciences, Kochi, India
| | - Sanjeev Kumar
- Physical Research Laboratory, Department of Space, Ahmedabad, India
| | - Anil Kumar Vijayan
- Centre for Marine Living Resources and Ecology, Ministry of Earth Sciences, Kochi, India.
| | - G V M Gupta
- Centre for Marine Living Resources and Ecology, Ministry of Earth Sciences, Kochi, India
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