- Dona Paula, Goa, India.
- +91-0832- 2450327
- iiosc2020[at]nio[dot]org
| Abstract Submission No. | ABS-2022-02-0385 |
| Title of Abstract | RECENT CHANGES IN THE ARABIAN SEA WARMING-CAUSES AND IMPLICATIONS |
| Authors | ARIKA AMASARAO*, KUNDI CHANDRA SEKHAR, G Venkat Ramana, P Sunitha |
| Organisation | Department of Meteorology and Oceanography, Andhra University |
| Address | Dept of Meteorology and Oceanography, Andhra university, Visakhapatnam,Andhra pr Visakhapatnam, Andhra pradesh, India Pincode: 530003 Mobile: 7995971507 E-mail: amasarao.arika@gmail.com |
| Country | India |
| Presentation | Oral |
| Abstract | Arabian Sea warming is the prime contributor in climate change and its impact on Indian monsoon. In the present study, Extended Reconstructed Sea Surface Temperature Version 5(ERSSTv5) dataset (1854-2020), European Centre for Medium-Range Weather Forecasts Reanalysis⿿Interim (ECMWF) data (1854-2020), TropFlux (1979-2019), Indian monsoon data assimilation analysis (IMDAA) wind data (1979-2019) are considered for understanding the Arabian Sea warming physical mechanisms. In methodology Crammer⿿s statistical test, Gumbel distribution were considered to study the decadal variations and extremes in Arabian Sea warming. Results indicate that the warming over the Arabian Sea is significantly increasing from 1951 onwards on annual and seasonal scales. Decadal variability of Arabian Sea Surface Temperature (SST) shows the rise of temperature over Arabian Sea is about 1oc from the study period. To further understand the physical mechanism Wind-Evaporation-SST feedback mechanism is considered. Over the equatorial Indian Ocean the zonal wind stress is reduced while it is increased over western Indian Ocean near Somali coast and Northern Arabian Sea. The upwelling induces the variations in the thermocline depth by increase of equatorial SSTs and it reduces the wind stress over equatorial Indian Ocean. TropFlux short wave radiations reduced over southern Indian Ocean and converse is observed over equatorial Indian Ocean. Long wave radiation is high over Arabian Sea including coastal regions. So the net heat flux also reduces over central Arabians sea, the latent heat flux is high along the western Indian Ocean and it shifted to northern Arabian Sea in post monsoon season and further persisted along the west coast of India. But sensible heat flux increased over central Arabian Sea and it moved along the west coast of India during winter season. Gumbel distribution extreme value analysis infers that the rise of temperatures 5oC in 100 year returning period over Arabian Sea. Key words: Arabian Sea warming, Wind-Evaporation-SST feedback, Crammer⿿s statistical test, Gumbel distribution |