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《Chinese Journal of Atmospheric Sciences》 2001-02
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simulating Influence of Positive Sea Surface Temperature Anomalies over the Eastern Equatorial Pacific on Subtropical High over the Western Pacific

Long Zhenxia and Li Chongyin (State Key Laboratory of Numerical Modeling Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029)  
IAP 2-level AGCM and LASG 9-level spectral AGCM are employed to simulate the effect of positive SSTAs with different duration (the SSTAs are prescribed only in January, January- February, January-April and January-August with the climatological SST in the other period respectively) over the eastern equatorial Pacific on the subtropical high over the western Pacific. The results suggest that despite the diversity of SSTAs duration, both the distribution and the temporal evolution of the anomalous subtropical high are similar, and so are the rainfall anomalies (therefore the latent release anomalies); the ITCZs are characterized by late northward displacement from the indian Ocean to the western Pacific in May. The agreement between the rainfall anomalies and the subtropical high anomalies over the western Pacific suggests the possible physical link between these two variables. The results also suggest that the atmospheric internal dynamical process is responsible for the insensitivity of atmospheric responses to the duration of SSTAs over the eastern equatorial Pacific. On one hand, the Rossby wave sources maintain the disturbances at middle-high latitudes which are excited in the tropics, on the other hand, the insensitivity of Rossby wave source to the duration of SSTAs over the eastern equatorial Pacific leads to the insensitivity of atmospheric responses to the duration of SSTAs over the eastern equatorial Pacific. The results show when the positive SSTAs are prescribed over the eastern equatorial Pacific, although the atmospheric internal dynamical process plays an important role, there is also obvious influence of positive SSTAs over the eastern equatorial Pacific in summer on the summer subtropical high over the western Pacific, therefore, the predictability of summer subtropical high over the western Pacific is determined by both the SSTA over the equatorial eastern Pacific and the atmospheric internal dynamical process. The different model results also suggest that the above results are model-independent.
【Fund】: 国家重点基础研究发展规划项目!G1998040900“我国重大气候灾害形成机理和预测理论的研究”第一部分;; 国家自然科学基金资助
【CateGory Index】: P731.27
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