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| Abstract Submission No. | ABS-2022-14-0356 |
| Title of Abstract | Impact of Extreme Climatic Events on Chlorophyll-a in the South Eastern Arabian Sea |
| Authors | Muhammad Shafeeque*, Balchand A. N., Grinson George, Smitha B. R., Phiros Shah, Shubha Sathyendranath, Trevor Platt |
| Organisation | Centre for Marine Living Resources and Ecology |
| Address | Project Scientist, CMLRE, LNG Rd, Puthuvype, Kochi, Kerala 682508 Ernakulam, Kerala, India Pincode: 682018 Mobile: 9846549699 E-mail: shafeequegazal@gmail.com |
| Country | India |
| Presentation | Poster |
| Abstract | Variability in chlorophyll-a (chl-a) and other associated Essential Climate Variables (ECVs) impact marine ecosystems and their resource abundance. Chl-a variability during the past decades in the South Eastern Arabian Sea (SEAS) is related to the prominent changes in these ECVs which are mainly controlled by basin-scale to mesoscale processes. For better understanding of this variability, satellite imageries of ocean colour and other relevant ECVs with high resolution are effective tools. Monthly data for chl-a, Sea Surface Temperature (SST), Sea Level Anomaly (SLA) and sea surface wind during 1998 to 2016 were analysed to explore the chl-a variability and possible causative factors influencing the variability. The time series and Hovmöller analysis indicated a strong relation between chl-a and other ECVs with maximum variability during the summer monsoon season (June to September). The occurrences of extreme climatic events such as El Niño-Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) were noticed during the study period. Significant variability in chl-a concentration and associated environmental variables was observed during such extreme events. Cross Correlation Function (CCF) analysis divulged the negative correlation between Chl-a and IOD with a lag of one month or less, whereas ENSO did not indicate such direct relations. The variability was further increased in those years in which IOD events co-occurred with ENSO. The possible physical mechanisms that might explain the chl-a variability associated with extreme climatic events for the SEAS region are explored. |