Computer Science
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012dyato..53....1h&link_type=abstract
Dynamics of Atmospheres and Oceans, Volume 53, p. 1-16.
Computer Science
Scientific paper
A coupled, regional ocean-atmosphere model was developed to study the role of air-sea interaction in East Asian summer monsoon. The coupled model used a coupler that was based on the model coupling toolkit (MCT) to couple the regional climate model (RegCM3) as atmospheric component and the Princeton Ocean Model (POM) as oceanic component. The simulation was carried out for the East Asian summer case in 1998, and the results were compared with observations and with simulation results of uncoupled RegCM3 forced by sea surface temperature (SST) derived from the coupled regional model. It was found that the coupled model was able to simulate the temporal and spatial distributions of SST in the East Asian summer monsoon region. Compared with the uncoupled model results, the coupled model showed the essence of air-sea interaction in the East Asian summer more realistically, leading to higher simulation skills on the simulation of monsoon circulation and rainfall. Local and remote air-sea interaction had great influences on the simulation of East Asian summer monsoon. Due to the local negative feedback of atmosphere on ocean, the rainfall over the adjacent ocean surrounding East Asia simulated by the coupled model was less than that in the uncoupled atmospheric model. However, the rainfall over the East Asian continent in the coupled run was less than that in the forced run due to remote air-sea interaction through a positive feedback process. The reduction of rainfall over the oceanic region due to air-sea coupling led to an increase in local specific humidity, as less moisture was used for local precipitation. The increased moisture due to less rainfall over the oceanic region was transport to East Asia by the summer monsoon flow, which led to more East Asian monsoon rainfall and enhanced condensation heating. Increased positive vorticity associated with enhanced condensation heating strengthened the monsoon flow through vorticity balance, which further strengthened the surface evaporation and local moisture in the adjacent ocean surrounding East Asia, leading to an enhanced moisture transport.
Hu Yijia
Liu Xiying
Zhong Zhong
Zhu Yimin
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