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Beijing, China

Guan H.,Army 61741 of PLA | Wang H.-J.,Chinese Academy of Sciences | Zhou L.,PLA University of Science and Technology | Yang S.,Army 61936 of PLA
Chinese Journal of Geophysics (Acta Geophysica Sinica)

Based on the theory of atmosphere-current-wave interaction, a regional atmosphere-ocean coupling system is formed in this paper. The complicated air-sea interaction under typhoon condition in South China Sea is studied using the coupling system. The experiment results show that the coupled model exhibits good capability in simulating the typhoon process and improves the simulation accuracy of typhoon track and intensity. With the feedback mechanism of the top oceanic environmental factors such as SST, sea spray and waves, the simulated typhoon system in the coupled model is stronger and moves more leftward than that in the uncoupled atmospheric model. The three different air-sea interaction processes, sea surface temperature (SST) decline,the spray effect and ocean wave action, have different influence on the typhoon system. SST decline and ocean wave act to resist the development of typhoon, while sea spray acts in an opposite way, it enhances the typhoon development through the heat transfer at the sea surface. In the three processes, the influences of SST decline and sea spray are more important, the influence of wave is least. The impact of air-sea interaction on the development of typhoon system is not a linear summation of the three factors. There are complicate interaction mechanisms among the three. Our conclusion is that in order to better explain and predict the occurrence and evolution of the weather disasters such as typhoon and other severe weather events in South China Sea, all the air-sea interaction processes should be considered. Source

Guan H.,Army 61741 of PLA | Zhou L.,Army 61741 of PLA | Xue Y.-G.,Army 61741 of PLA | Zhang Y.,Army 61741 of PLA
Journal of Tropical Meteorology

Based on MM5, POM, and WW3, a regional atmosphere-ocean-wave coupled system is developed in this work under the environment of Message Passing Interface. The coupled system is applied in a study of two typhoon processes in the South China Sea (SCS). The results show that the coupled model operates steadily and efficiently and exhibits good capability in simulating typhoon processes. It improves the simulation accuracy of the track and intensity of the typhoon. The response of ocean surface to the typhoon is remarkable, especially on the right side of the typhoon track. The sea surface temperature (SST) declines, and the ocean current and wave height are intensified. In the coupling experiment, the decline of SST intensifies and the inertial oscillation amplitude of the ocean current increases when the ocean-wave effect is considered. Therefore, the atmosphere-ocean-wave coupled system can help in the study of air-sea interaction and improve the capability of predicting and preventing weather and oceanic disasters in SCS. Source

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