Part 1) Trends and Teleconnections among South and East Asian Monsoons: A Review, Part 2) Monsoon Variability over South and East Asia : Role of Southern Annular Mode

Seminar by Dr. Ramesh Hiranand Kripalani from Indian Institute of Tropical Meteorology

13 June 2019
13:00 - 15:00

The Seminar is being held in Room 1010 (Jasmin) - Intergrated mechanical engineering building. Click here for the campus map.

Part 1)

The connections between South and East Asian Summer Monsoons have been a topic of research since decades. Several studies by the Chinese and the Indian scientists have documented that the summer monsoon rainfall over the Indian region is directly related with summer monsoon rainfall over North China but inversely related with monsoon over the Korean peninsula and the surroundings. While one school of thought suggests the impact of the Indian Monsoon on the East Asian Monsoon another view suggests the opposite. Furthermore the summer monsoon rainfall over India and over North China has been indicating a decreasing trend and that over the Korean peninsula an increasing trend. The possible roles of the Indian Ocean, the Pacific Ocean, the El Nino Southern Oscillation phenomenon, the Indian Ocean Dipole Mode, the West Pacific Subtropical High and the South Asian High to understand these observed climate trends and tele-connections will be presented. Possible future projections will also be discussed.

Part 2) 

The influence of the Southern Annular Mode (SAM) on the summer monsoon rainfall over India and over South Korea is examined based on observational data for the period 1983- 2013. Results reveal that the February-March SAM reveals a significant positive relationship with the June-September India summer monsoon rainfall (ISMR). On the other hand, the May-June SAM is positively related with the subsequent June-August Korean Monsoon Rainfall (KMR). Thus, a delayed influence of SAM is observed with the ISMR and a simultaneous relationship is observed with the KMR. Interestingly the sea surface temperatures over the central Pacific Ocean transmit the SAM influence over the Indian sub- continent as well as over the Korean peninsulas. The possible physical mechanism explaining the delayed and simultaneous influence will be discussed during this presentation.