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《Chinese Journal of Atmospheric Sciences》 2001-01
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Intraseasonal Oscillation in a Coupled General Circulation Model

Li Wei and Yu Yongqiang (State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029)  
Daily-mean reanalyses from the National Centers for Environmental Prediction/Na tional Center for Atmospheric Research (NCEP/NCAR) for the years 1980-1989 are used as verification data in a study of intraseasonal oscillation (IO) in the GOALS/LASG coupled general circulation model. The projection of the IO onto the upper troposphere zonal wind provides a useful measure of intraseasonal activities. The results show that GOALS/LASG captures the salient features of IO in the tropics. The simulated IO is more realistic than that by some other atmospheric general circulation models with respect to an increased intensity, while it is not as spatially coherent and not as typically periodical as the observed. There is a tendency in both NCEP and the simulation that the representing of seasonal preference for the IO to form during the boreal winter/spring is related to its interannual variability, with the correct seasonal signature being simulated during the year of stronger IO. It is suggested that the simulated interannual variability of IO is related to the sea surface temperature (SST) anomalies for the Nino 3 region of the central and East Pacific. In the year with positive SST anomalies, IO activity is weak. The most significant correlation appears 60 days behind the phase of IO. In comparison with the data from the atmospheric circulation model of GOALS/LASG with a specified annual cycle SSTs, the coupled model represents an increased seasonal signature, which suggests the regulation to IO by the ocean-atmosphere interaction. An accurate representation of IO can only be available by the using of coupled model.
【Fund】: 中国科学院“百人计划”新型学科“海气耦合气候系统模式的有效化研究”和“优秀国家重点实验室研究项目”!(4982-3002)
【CateGory Index】: P433
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