01-05 December 2025
INCOIS, Hyderabad, India.
| Abstract Submission No. | ABS-04-0357 |
| Title of Abstract | Long-term Variability of Water Vapor over the Tropical Indian Ocean and Its Relationship to Climate Variability |
| Authors | Hanna Na*, Jeongwook Park |
| Organisation | Seoul National University |
| Address | 1 Gwanak-ro, Gwanak-gu Seoul, Seoul, Korea, Rep. Pincode: 08826 E-mail: hanna.ocean@snu.ac.kr |
| Country | Korea, Rep. |
| Presentation | Poster |
| Abstract | Precipitable water vapor has shown an increasing trend in the Indian Ocean over the last 30 years. However, the linear trend varies depending on the region, season, and analysis period, which is associated with interannual to decadal variability of water vapor. This study examines the long-term variability of water vapor in the tropical Indian Ocean by analyzing 60 years of ERA5 total column water vapor (TCWV) data. The results show that TCWV variability exhibits two major modes: (1) a dipole mode, characterized by opposite signs of anomalies between the western and eastern regions, associated with the Indian Ocean Dipole (IOD) and the El Nino Southern Oscillation (ENSO); and (2) a trend mode, which is stronger in the eastern region and linked to the Indian Ocean Basin Mode. Discussions on the relationship between the two dominant modes and climate variability will be presented, including a plausible influence of the strong positive phases of the IOD and ENSO in 2023. |
| Are you part of IIOE-2 endorsed project | no |
| Keywords | Indian Ocean, Water Vapor, Indian Ocean Dipole, ENSO, Indian Ocean Basin Mode |
| For Awards | no |