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| 春夏季节转换中西太平洋副热带高压东移与大尺度环流和温度场变化关系 | |
| 引用本文： | 祝从文,陈隆勋,何金海.春夏季节转换中西太平洋副热带高压东移与大尺度环流和温度场变化关系[J].热带气象学报,2004,20(5):493-504. |
| 作者姓名： | 祝从文 陈隆勋 何金海 |
| 作者单位： | 1. 中国气象科学研究院,北京,100081;中国科学院大气物理研究所LASG,北京,100029 2. 中国气象科学研究院,北京,100081 3. 南京信息工程大学,江苏,南京,210044 |
| 基金项目： | 国家自然科学基金，国家自然科学基金，中国科学院大气物理研究所资助项目 |
| 摘 要： | 分析了由春向夏的季节转换过程中西太平洋副热带高压与大尺度环流和温度场之间的变化关系.结果表明:4月份,西太平洋副热带高压开始表现出向东移动特征,6月份它与向西移动的北美副高在东太平洋120～160 (W区域合并.这一期间,沿15～20 (N之间的纬圈环流同时表现出向东移动特征,该纬圈环流的上升支位于南海-西太平洋暖池一带,下沉支主要位于东太平洋180 (～120 (W区域.伴随上述变化,位于北半球太平洋的局地Hadley环流在纬向随时间表现出东强西弱变化特点.西太平洋副高向东移动与15～20 (N之间的纬圈环流和130 (W东太平洋局地Hadley环流在15～25 (N上空交汇、下沉密切相关.在由春向夏季节转换中,大气和海表温度关于赤道季节转换速率沿纬向表现出东慢西快差异,上述变化为西太平洋副热带高压的向东移动提供了有利的气候背景. |
| 关 键 词： | 季节转换 副高东移 环流变化 |
| 文章编号： | 1004-4965(2004)05-0493-12 |
| 收稿时间： | 2003/6/18 0:00:00 |
| 修稿时间： | 2003年6月18日 |
THE EASTWARD PROPAGATING WESTERN PACIFIC SUBTROPICAL HIGH AND ITS RELATIONSHIPS WITH LARGE-SCALE CIRCULATION AND TEMPERATURE DURING SPRING TO SUMMER |
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| ZHU Cong-wen,CHEN Long-xun and HE Jin-hai.THE EASTWARD PROPAGATING WESTERN PACIFIC SUBTROPICAL HIGH AND ITS RELATIONSHIPS WITH LARGE-SCALE CIRCULATION AND TEMPERATURE DURING SPRING TO SUMMER[J].Journal of Tropical Meteorology,2004,20(5):493-504. | |
| Authors: | ZHU Cong-wen CHEN Long-xun and HE Jin-hai |
| Institution: | Chinese Academy of Meteorological Sciences, Beijing 100081, China;LASG, Institute of Atmospheric Physics, CAS, Beijing 100029, China;Chinese Academy of Meteorological Sciences, Beijing 100081, China;Nanjing University of Infonnation Science & Technology, Nanjing 210044, China |
| Abstract: | The eastward seasonal shift of the western North Pacific sub-tropical high (WNPSH) and its relationships with the large-scale thermal-dynamic circulation and temperature are analyzed based on NCAR/NCEP reanalyzed data sets and sea surface temperature (SST). Result suggests that during the boreal seasonal transition, the WNPSH exhibits an eastward shifting in April and move to the region of 120-160°W, where it connects the counterpart coming from North America in June. There exists remarkable contrast between local Hadley cells over the Pacific Ocean in zonal. The Hadley cell over the western Pacific displays a seasonal decaying mode corresponding to the opposite counterpart over the eastern Pacific. The eastward propagation of the WNPSH can be explained by the enhanced down welling, coming from the counterpart of zonal cell between 15 and 25°N and the Hadley cell along 130°W over the eastern Pacific. The integrated atmosphere temperature and SST exhibit a faster/slower thermal reversal opposite to the equator over the eastern Pacific, which sustains the large-scale circulation and favors the eastward propagation of WNPSH. |
| Keywords: | seasonal transition eastward propagation of WNPSH large-scale circulation |
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