| 与西澳州西南部冬季降水相联系的大气环流特征分析 |
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| 引用本文： | 李建平,李艳杰,冯娟.与西澳州西南部冬季降水相联系的大气环流特征分析[J].大气科学,2011,35(5):801-817. |
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| 作者姓名： | 李建平 李艳杰 冯娟 |
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| 作者单位： | 1.中国科学院大气物理研究所大气科学和流体力学数值模拟国家重点实验室,北京, 100029 |
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| 基金项目： | 国家重点基础研究发展规划项目2010CB950400, 国家自然科学基金资助项目41030961 |
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| 摘 要： | 西澳大利亚州西南部(SWWA)是西澳大利亚州首府Perth的所在地,也是西澳州政治、经济、文化、教育和旅游的中心.自20世纪中期以来,SWWA地区雨季降水持续减少.本文利用近60年的观测及再分析数据,分析了已知的影响澳大利亚降水的热带海洋模态:厄尔尼诺—南方涛动(ENSO)、印度洋偶极子(IOD)和ENSOModoki...
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| 关 键 词： | 西澳州西南部类季风环流 季风 厄尔尼诺—南方涛动 降水 南半球环状模 印度洋偶极子 |
The Characteristics of Atmospheric Circulation Associated with Austral Winter Rainfall in Southwest Western Australia |
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| LI Jianping,LI Yanjie and FENG Juan.The Characteristics of Atmospheric Circulation Associated with Austral Winter Rainfall in Southwest Western Australia[J].Chinese Journal of Atmospheric Sciences,2011,35(5):801-817. |
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| Authors: | LI Jianping LI Yanjie and FENG Juan |
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| Institution: | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029;State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029; Graduate University of Chinese Academy of Sciences, Beijing, 100049;State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029; College of Atmospheric Sciences, Lanzhou University, Lanzhou, 730000 |
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| Abstract: | Southwest Western Australia (SWWA) locates in the southwest corner of Western Australia. Its capital, Perth, is not only the political, economic, cultural, educational, and tourism center of Western Australia, but also the wine region and wheat belt of Western Australia. The observed rainy season precipitation over SWWA has significantly declined since the 1950s. The reduction in austral winter rainfall resulted in an even sharper fall in the stream flow in southwestern Australia and heavily impacted the water resources in the state. Based on the observation data and reanalysis datasets in recent 6 decades, the variability and circulation features influencing the SWWA austral winter rainfall (SWR) are investigated. The impacts of the known modes, which may have impacts on the Australian rainfall, El Niño-Southern Oscillation (ENSO), Indian Ocean Dipole (IOD), ENSO Modoki (EM), and Southern Hemisphere Annular Mode (SAM) on the SWR are analyzed. It is found that they all cannot explain the long term rainfall variation of the SWR in neither early (May to July, MJJ) nor late (August to October, ASO) austral winter. Particularly, the reported significant inverse relationship between the SAM and SWR is caused by an extreme year. Based on the investigation on rainfall distribution over SWWA, seasonal march of the circulation features, dynamical and thermal structures of the atmospheric circulation, and thermal contrast between land and sea over wider southwest Australia, the authors find that the circulation over SWWA shows strong seasonality, and exhibits monsoonal characteristics, that is, alternate wet and dry seasons, seasonal reversal of prevailing winds, and an evident land-sea thermal contrast. Taking account of these monsoonal characteristics, the authors propose the concept of monsoon-like southwest Australian circulation (SWAC), and discuss the relationship between the SWAC and the SWR. The result indicates that the variability of SWAC contributes to the variation of SWR, whose weakening is a possible reason for the SWR decreasing. |
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| Keywords: | monsoon-like Australian circulation monsoon ENSO precipitation Southern Hemisphere Annular Mode Indian Ocean dipole |
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