01-05 December 2025
INCOIS, Hyderabad, India.
| Abstract Submission No. | ABS-04-0191 |
| Title of Abstract | Rising Frequency of Yangtze River Floods Linked to Shifts in the Indian Ocean Wave Characteristics |
| Authors | Panini Dasgupta*, SungHyun Nam, Michael J. McPhaden, Dong-Jin Kang, M. K. Roxy, Saranya J S |
| Organisation | Seoul National University |
| Address | 1 Gwanak-ro, Gwanak-gu, Seoul, Republic of Korea Seoul, Seoul, Korea, Rep. Pincode: 08826 E-mail: panini@snu.ac.kr |
| Country | Korea, Rep. |
| Presentation | Oral |
| Abstract | In recent decades, particularly since the 1990s, the frequency of flood events in the Yangtze River Basin has increased significantly. This rise in hydroclimatic extremes is closely linked to enhanced variability at the quasi-biennial (QB) timescale. In this study, using sea surface height (SSH) and thermocline depth data from the ORAS5 reanalysis and the EN4 observational analysis, we demonstrate that the increased QB variability in East Asian summer monsoon rainfall over the Yangtze River Basin is strongly coupled with intensified QB-scale wave dynamics in the Indian Ocean. We present strong evidence of fundamental changes in the characteristics of baroclinic waves in the tropical Indian Ocean in recent decades. We find that the mean phase speed of westward-propagating tropical Rossby waves has increased, along with their overall variance. These shifts are likely associated with changes in oceanic circulation and large-scale atmospheric forcing. Our findings highlight that evolving Indian Ocean wave dynamics is a key contributor to the amplification of monsoon variability and the associated hydrological extremes over East Asia. |
| Are you part of IIOE-2 endorsed project | yes |
| Endorsed Project Number | IIOE2-EP51 |
| Keywords | Yangtze River Discharge, Quasi-biennial,Tropical Rossby Waves |
| For Awards | yes |
| Date Of Birth | 18-04-1991 |
| ECSN Registration Number | IIOE2-ECSN-0138 |