大气科学2012，Vol.36Issue(6)：1191-1206,16.DOI:10.3878/j.issn.1006-9895.2012.11244
两个大气环流模式SAMIL和BCC_AGCM对北半球冬季极涡振荡的模拟对比
Comparison of SAMIL and BCC_AGCM Simulations of the Polar Vortex Oscillation in the Northern Hemisphere Winter
摘要
Abstract
By using AMIP simulation results for 1950-1999 from SAMIL and BCCAGCM, the performance of the models in simulating the winter stratospheric circulation and polar vortex oscillation is assessed by comparing their results with the NCEP data. Both models can reproduce the general patterns of the winter climatology and the leading oscillation mode of the winter stratospheric circulation. However, the meridional temperature gradients between the tropics and the extratropics simulated by two models, as well as the polar vortex and polar jet, are much stronger on average than those in the NCEP data. Harmonic analysis of the winter climatology geopotential height from 100 hPa to 20 hPa indicates that planetary waves in both models are significantly weaker than in the NCEP data. A one-month seasonal drift exists in the seasonal evolution of the 10 hPa polar jet in both models compared with the NCEP data, and the simulated subtropical westerly jet at 200 hPa is weaker. The first empirical orthogonal function modes of the zonal-mean zonal wind anomalies from both models reflect oscillations in the intensity of the stratospheric polar vortex, whereas the occurrence of polar vortex oscillation events is more frequent in BCCAGCM than in SAMIL. The dominant period of the polar vortex oscillation events is 5.5 months in SAMIL, 4.8 months in BCCAGCM, and 4.6 months in the NCEP data. Furthermore, polar vortex oscillation events occur mainly in February-March in SAMIL and in February-April in BCCAGCM, whereas they occur from December to March in the NCEP data.关键词
SAMIL/BCC_AGCM/平流层极涡振荡Key words
SAMIL, BCCAGCM, stratospheric polar vortex oscillation分类
天文与地球科学引用本文复制引用
刘玉镇,任荣彩,何编..两个大气环流模式SAMIL和BCC_AGCM对北半球冬季极涡振荡的模拟对比[J].大气科学,2012,36(6):1191-1206,16.基金项目
国家重点基础研究发展计划2010CB428600、2010CB950400 （）
