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| A Climatology of the Southwest Vortex during 1979–2008 | |
| 基金项目： | supported by the National Natural Science Foundation of China (Grant Nos. 41275064 and 41175057);the Public Science and Technology Research Fund Projects of the Ocean (Grant No. 201005019) |
| 摘 要： | Using a new vortex detection and tracing method, a dataset of the Southwest Vortex（SWV） is established based on Japanese 25-year Reanalysis（JRA-25） reanalysis data during 1979–2008. The spatiotemporal features of the SWV are derived from the dataset. In comparison to other seasons, summer yields the least SWVs, but with the highest probability that they will migrate from their region of origin. SWVs mostly emerge in the southwest of the Sichuan Basin and the southeast of the Tibetan Plateau. Migratory SWVs mainly move along either an eastward or southeastward path. Detailed composite analysis of warm-season SWVs shows that the subtropical high is a key factor in determining the direction of migratory SWVs. Furthermore, the steering wind at 700 hPa dominates the moving direction of migratory SWVs. Potential stability diagnosed by pseudo-equivalent potential temperature ？ se is of certain significance for the evolution and movement of SWVs. On the other hand, migratory SWVs possess relatively greater strength than stationary SWVs, due to a stronger low-level jet with enhanced baroclinicity and moisture transport providing more energy to support the growth of SWVs along their paths of movement. |
| 关 键 词： | 西南涡 青藏高原东南部 气候 移动方向 再分析资料 副热带高压 假相当位温 跟踪方法 |
A Climatology of the Southwest Vortex during 1979-2008 |
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| Authors: | ZHONG Rui ZHONG Lin-Hao HUA Li-Juan FENG Shi-De |
| Institution: | 1. University of Chinese Academy of Sciences, Beijing 100049, China 2. Key Laboratory of Regional Climate-Environment for East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China 3. Key Laboratory of Computational Geodynamics, University of Chinese Academy of Sciences, Beijing 100049, China 4. Key Laboratory of Cloud-Precipitation Physics and Severe Storms, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China |
| Abstract: | Southwest Vortex,spatiotemporal distribution,migratory vortex,subtropical high,low-level jet,potential stability |
| Keywords: | Southwest Vortex spatiotemporal distribution migratory vortex subtropical high low-level jet potential stability |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ | |