100hPa高压环流和东风气流的季节、年际和年代际变化

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基金项目: 《国家重点基础研究规划项目》(1998040900)"我国重大气候灾害的形成机理和预测理论研究";国家自然科学基金项目"南亚高压和亚洲季风相互作用及其机理的研究"(40175021)资助

THE SEASONAL,INTERANNUAL AND INTERDECADAL VARIATIONS OF THE ANTICYCLONE AND THE EASTERLY CURRENT AT 100 HPA

摘要: 利用NCEP/NCAR再分析资料,分析了中低纬地区100hPa高压环流和东风气流的季节、年际和年代际变化,并与南亚高压的相应变化进行对比分析。结果表明,100hPa高压环流中心有明显的季节分布特征,其中心经度的主频区与100hPa南亚高压中心经度的主频区位置较为一致。南亚高压和东风气流的部分特征参数有明显的年际和年代际变化。南亚高压参数有明显的10年和大于20年的振荡周期。东风气流的面积有2～5年的振荡周期,其强度则有4年和15年的振荡周期。
- 东风气流 /
- 季节、年际和年代际变化 /
- 小波分析
Abstract: The seasonal,interannual and interdecadal variations of the 100 hPa anticyclone and the easterly current are analyzed by using the NCEP/NCAR reanalysis data and comparison with that of the 100 hPa South Asian High (SAH). The results show that the seasonal variations of the centers of both the SAH and the anticyclone are obvious and in consistence with each other. The interdecadal variations of some characteristic parameters of the SAH and the easterly wind are obvious. The SAH has main time periods of about 10 and more than 20 years,while the easterly current has periods of about 4 and 15 years.
- easterly current /
- seasonal variation /
- interannual variation

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