HR: 11:45h
AN: A22A-04    [Abstracts]
TI: Variability of the Indian Ocean SST and Its Impacts on Asian-Australian Monsoon Climate
AU: * Yang, S
EM: song.yang@noaa.gov
AF: NOAA's Climate Prediction Center, 5200 Auth Road, Room 605, Camp Springs, MD 20746 United States
AU: Yoo, S
EM: Soo-Hyun.Yoo@noaa.gov
AF: NOAA's Climate Prediction Center, 5200 Auth Road, Room 605, Camp Springs, MD 20746 United States
AU: Ho, C
EM: hoch@cpl.snu.ac.kr
AF: School of Earth and Environmental Sciences, Seoul National University, Seoul, Korea, Republic of
AB: In this study, we investigate the relationship between the Indian Ocean (IO) sea surface temperature (SST) and the Asian and Australian monsoons on seasonal to interannaul timescales. We focus on the dominant features of IO SST, the impacts of IO SST on different monsoon components, and the relative importance of the northern and southern IO for the monsoons. The most dominant mode of IO SST is characterized by uniform warming or cooling, with maximum variance in the southern hemisphere. This warming or cooling exerts a larger impact on the monsoon climate than does the tropical IO dipole mode. The persistence of IO SST is large from the boreal fall to the next spring and small from summer to fall, a feature associated with a seasonal alternation of the dominance of ENSO-monsoon and IO-monsoon relationships. The IO SST is strongly linked to the Asian and Australian monsoons and has a notable predictive potential. The IO SST leads to opposite changes in the South Asian monsoon and the Southeast Asian monsoon, reinforcing the usually out-of-phase relationship between the two monsoon components. While an increase in IO SST strengthens the South Asian monsoon, a feature usually applied in the context of tropospheric biennial oscillation, it weakens the Southeast Asian monsoon. In spring, the southern IO SST is related to the Asian summer monsoon more closely than is the northern IO SST. In fall, the northern IO SST influences the following Australian monsoon more strongly than does the southern IO SST.
DE: 3339 Ocean/atmosphere interactions (0312, 4504)
DE: 3374 Tropical meteorology
DE: 4504 Air/sea interactions (0312)
SC: Atmospheric Sciences [A]
MN: 2005 Joint Assembly