- Dona Paula, Goa, India.
- +91-0832- 2450327
- iiosc2020[at]nio[dot]org
Abstract Submission No. | ABS-2022-10-0054 |
Title of Abstract | Variability in the relative strength of summer and winter Indian monsoon during the last 1.45 myr |
Authors | Sudhira Ranjan Bhadra*, Rajeev Saraswat |
Organisation | CSIR - National Institute of Oceanography |
Address | Micropaleontology lab, CSIR- NIO, Dona Paula Goa, Goa, India Pincode: 403004 Mobile: 9438235338 E-mail: sudhirabhadra@gmail.com |
Country | India |
Presentation | Oral |
Abstract | The substantial variability in the strength of the Indian monsoon greatly affects the Indian subcontinent and its people. The summer and winter monsoon affects differently to the Indian climate. The short-term variability in the Indian monsoon is well documented through instrumental records and paleoclimatic studies of recent geological past. The mid-Pleistocene transition (MPT) had a large-scale effect on the global climate. However, because of the scarcity in the long term records of changes in monsoon strength, the effect of MPT on the Indian monsoon has not been discussed extensively. The western Bay of Bengal, being the core monsoon region, provides an ideal location to understand monsoon-induced seasonality and productivity changes. We have used a 1.45 myr record of planktic foraminifera assemblages from the site IODP353 U1446 to understand the change in the relative strength of summer and winter monsoon and the effect of MPT on them. We report that productivity was mainly controlled by the summer monsoon during the last 1.45 myr. The Indian summer monsoon strengthened, and the productivity increased after the MPT, whereas the winter monsoon weakened. The winter monsoon was stronger during the glacial period, whereas the summer monsoon was stronger during the interglacial period. |