01-05 December 2025
INCOIS, Hyderabad, India.
| Abstract Submission No. | ABS-04-0319 |
| Title of Abstract | Role of the Indonesian Throughflow in Modulating Indian Ocean SST and Monsoon Rainfall Variability |
| Authors | K Chandra Sekhar*, P Sunitha, A Amasa Rao, K Arjuna Suneetha |
| Organisation | Dept of Meteorology and Oceanography, Andhra University |
| Address | Department of Meteorology and Oceanography, Andhra University, Visakhapatnam Visakhapatnam, Andhrapradesh, India Pincode: 530003 E-mail: kundichandrasekhar3@gmail.com |
| Country | India |
| Presentation | Oral |
| Abstract | The Indonesian Throughflow (ITF) plays a crucial role in the global overturning circulation, acting as a low-latitude conduit for warm, fresh Pacific waters to flow into the southern Indian Ocean (SIO). The South eastern Indian Ocean is the main region which is affected immediately by pacific warm water. SST skewness over ITF region shows the positive skewness in post-monsoon and winter seasons, reflecting its sensitivity to ENSO-induced warming and over Arabian Sea experiences persistent negative skewness during summer and summer monsoon due to upwelling, while the southern Indian Ocean(SIO) exhibits positive skewness linked to subtropical gyres and IOD variability. The anomalous cooling occurred over ITF during monsoon season in El Nino and PIOD years, while anomalous warming observed during pre monsoon season in El Nino years and post monsoon season in PIOD years. Heat transport anomalies differ between El Niño and PIOD years, with El Niño showing dipole patterns and PIOD exhibiting predominantly positive fluxes. Importantly, post-monsoon ITF SST anomalies have a stronger and more persistent influence on SSTs in the AS and SIO, suggesting oceanic and atmospheric feedbacks that modulate regional climate. The high magnitude westward moving winds (3-6.5m/s) over ITF region will transport warm water to South-eastern Indian Ocean during post monsoon season and transport cold water in monsoon season. The high magnitude westward moving winds (3-6.5 m/s) over ITF region will transport warm water to South-eastern Indian Ocean during post monsoon season and transport cold water in monsoon season. SSTs in the ITF region correlate positively with Indian summer monsoon rainfall(ISMR), especially over central India, reinforcing the ITF⿿s critical role in Indo-Pacific climate dynamics and seasonal predictability. |
| Are you part of IIOE-2 endorsed project | no |
| Keywords | Climate Variability, Indian Ocean Dipole, Ocean Heat Content, Sea Surface Temperature |
| For Awards | no |