Summary of Abstract Submission

Abstract Submission No. IO50-04-0046PresentationPoster

DIAGNOSIS OF THE MECHANISM OF SST SEASONAL CYCLE SOUTH OF JAVA

Yongliang Duan*1, Weidong Yu**1

1 First institute of Oceanography, SOA, China, China

ABSTRACT :

The variability of the sea surface temperature (SST) in the southeastern Indian Ocean plays a critical role in the Indonesian-Australian monsoon onset, the Indian Ocean Dipole (IOD) event and basin scale tropical climate. However, the seasonal SST depression in the Java Upwelling region is much weaker than that in the other eastern boundary upwelling regions. The mixed layer heat budget analysis based on five high-resolution global ocean data assimilation products shows that during the coastal upwelling event (May-November), warming horizontal advection from Indonesian Throughflow and the cooling entrainment associated with Java Upwelling are nearly counterbalanced as previous studies concluded. The results also reveal that the surface heatflux forcing term is an indispensable factor in determining the monthly SST evolution and the small SST depression south of Java. The heat flux feedback mechanisms, including negative SST┐Cloud┐Radiation feedback and positive Wind-Evaporation-SST feedback, play indispensable roles in adjusting the amplitude of seasonal SST variability.