- Dona Paula, Goa, India.
- +91-0832- 2450327
- iiosc2020[at]nio[dot]org
| Abstract Submission No. | ABS-2022-05-0341 |
| Title of Abstract | Eddy mediated chlorophyll blooms in North Indian Ocean |
| Authors | Sunanda N*, Jayanarayanan Kuttippurath, Anjaneyan P, Arun Chakraborty |
| Organisation | Indian Institute of Technology, Kharagpur |
| Address | CORAL 6TH FLOOR JC GHOSH PC RAY BLOCK INDIAN INSTITUTE OF TECHNOLOGY KHARAGPUR, KHARAGPUR, West Bengal, India Pincode: 721302 Mobile: 8089432457 E-mail: sunanda.narayanan@gmail.com |
| Country | India |
| Presentation | Oral |
| Abstract | The North Indian Ocean is known for its complexity of dynamics in both physics and biology owing to two similar yet contrasting basins, Bay of Bengal (BoB) and Arabian Sea (AS). Mesoscale eddies are formed due to the interplay of ocean currents, winds having a lifetime of the order of a month, and they have a significant influence on the physics and biological properties of the ocean. In this study, we analyse the role of mesoscale eddies in regulating Chlorophyll-a (Chl-a) blooms in AS and BoB for the period from 1997 to 2019. We have used Ocean Color Climate Change Initiative (OC-CCI) data at 4 km x 4 km resolution for Chl⿿a. We have made use of Sea Level Anomaly data from AVISO, which were constructed by merging different satellite measurements at a resolution of 0.25° x 0.25°. In general, AS is traditionally pronounced as a more productive basin compared to BoB, although some studies have shown that BoB is subjected to eddy-mediated primary productivity during fall and spring intermonsoon seasons. The tracking algorithm suggests the dominance of cyclonic eddies (negative SSHA) over anticyclonic eddies in NIO. The highest blooms are confined to the monsoon (June, July, August and September) season in AS and BoB. For the composite analysis of SSHA and Chl⿿a, and to investigate the dynamic link between them, these data are interpolated to the same grid. The eddy data are interpolated to ¼ ° x ¼ ° and Chl ⿿ a is subjected to low pass filter to retain the mesoscale variability. We collocate the Chl ⿿ a for each eddy over space and time. The contribution of cyclonic and anticyclonic eddies in regulating the phytoplankton blooms is analysed and will be presented. |