Simulation of the East Asian Subtropical Westerly Jet Stream with GFDL AGCM (AM2.1)

Simulation of the East Asian Subtropical Westerly Jet Stream with GFDL AGCM (AM2.1)
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用GFDL AGCM (AM2.1)模拟东亚副热带西风急流

DOI:
10.1080/16742834.2011.11446902
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发表时间:
2011-01
期刊:
Atmos. Oceanic Sci. Lett.
影响因子:
--
通讯作者:
Huang,Gang
Huang,Gang
中科院分区:
其他
文献类型:
--
作者:
Liu,Yong;Huang,Gang

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摘要本研究验证了AM2.1模型再现东亚副热带西风急流基本特征的能力。AM2.1模型是由美国国家海洋和大气管理局地球物理流体动力学实验室(GFDL)开发的。通过对NCEP/NCAR观测资料的再分析,研究了EASWJ的主要行为。该模式基本上很好地描述了东亚西风急流的平均状态,包括其强度、位置、结构和季节演变。与观测结果相比,模式倾向于再现较弱的喷流中心。在夏季,模拟急流中心位于北方。结果还表明,该模型捕捉EASWJ在夏季的变化。对东亚200 hPa(U200)纬向风场应用经验正交函数(ERF)的观测和模拟结果表明,东亚200 hPa纬向风场在20世纪70年代末前后存在年代际变化。在99%的置信水平下,相应主成分之间的相关系数高达0.42,具有显著性。
Abstract The present study validated the capability of the AM2.1, a model developed at NOAA's Geophysical Fluid Dynamics Laboratory (GFDL), in reproducing the fundamental features of the East Asian Subtropical Westerly Jet Stream (EASWJ). The main behaviors of the EASWJ are also investigated through the reanalysis of observational NCEP/NCAR data. The mean state of the EASWJ, including its intensity, location, structure, and seasonal evolution is generally well-portrayed in the model. Compared with the observation, the model tends to reproduce a weaker jet center. And, during summer, the simulated jet center is northward-situated. Results also demonstrate the model captures the variability of EASWJ during summer well. The results of the empirical orthogonal function (EOF) applied on the zonal wind at 200 hPa (U200) over East Asia for both the observation and simulation indicate an inter-decadal shift around the late 1970s. The correlation coefficient between the corresponding principle components is as great as 0.42 with significance at the 99% confidence level.
东亚副热带西风急流的季节变化及其热力机制
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