| IPO调节大西洋纬向模对澳大利亚秋季降水年际变动的影响 |
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| 引用本文： | 杨萌洲,袁潮霞.IPO调节大西洋纬向模对澳大利亚秋季降水年际变动的影响[J].大气科学学报,2022,45(1):76-86. |
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| 作者姓名： | 杨萌洲 袁潮霞 |
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| 作者单位： | 南京信息工程大学 气象灾害教育部重点实验室/气象灾害预报预警与评估协同创新中心/气候与应用前沿研究院, 江苏 南京 210044 |
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| 基金项目： | 国家重点研发计划资助项目（2016YFA0600402）；南京信息工程大学人才启动经费（2015r035） |
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| 摘 要： | 采用1900-2014年115 a的观测和再分析资料,使用滤波、线性相关等方法,研究太平洋年代际振荡(Interdecadal Pacific Oscillation,IPO)调节大西洋纬向模(Atlantic Zonal Mode,AZM)对澳大利亚秋季降水年际变动的调节作用及机制.结果 表明,当IPO位于正位相时,...
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| 关 键 词： | 太平洋年代际振荡(IPO) 大西洋纬向模(AZM) 澳大利亚 秋季降水 |
| 收稿时间： | 2021/2/18 0:00:00 |
| 修稿时间： | 2021/3/26 0:00:00 |
IPO modulates the influences of Atlantic Zonal Mode on the interannual variations of Australian autumn precipitation |
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| YANG Mengzhou,YUAN Chaoxia.IPO modulates the influences of Atlantic Zonal Mode on the interannual variations of Australian autumn precipitation[J].大气科学学报,2022,45(1):76-86. |
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| Authors: | YANG Mengzhou YUAN Chaoxia |
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| Institution: | Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)/Institute for Climate and Application Research(ICAR), Nanjing University of Information Science&Technology, Nanjing 210044, China |
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| Abstract: | Using the observation and reanalysis data for the period of 1900-2014,this study shows that the impacts of Atlantic Zonal Mode (AZM) on the interannual variations of Australian autumn precipitation can be modulated by Interdecadal Pacific Oscillation (IPO).It is revealed that,when the IPO is in the positive phase,the AZM decreases the autumn precipitation in central Australia,whereas,when the IPO is in the negative phase,the AZM increases the autumn precipitation in central and southern Australia.The reason for this is that,during the IPO positive phase,the anomalous warming and ascending motion in the tropical Atlantic related to the AZM induce anomalous descending motion over the tropical eastern Pacific,thereby leading to anomalous upward motion around the Maritime continent.The anomalous upward motion adjusts the local Hadley circulation and results in anomalous subsidence in central Australia.This,together with the anomalous anticyclone in the lower troposphere,the southeasterly anomalies of which along the northwestern frame hinder the transport of warm and humid water vapor from the tropical Indian Ocean,results in a precipitation deficit in central Australia.In contrast,during the IPO negative phase,due to the different basic state and stronger AZM amplitude when compared to those during the IPO positive phase,the Rossby wave in the mid-high latitudes of the Southern Hemisphere caused by the AZM induces a barotropic cyclone in Australia.The anomalous cyclone not only trigger the anomalous ascending motion,but also contribute to the greater transportation of warm moisture from the tropical Indian Ocean to central and southern Australia,by means of the anomalous northwester lies along the northwestern frame,in turn leading to surplus precipitation in this region.Therefore,the IPO modulates the AZM-Australian precipitation relationship by altering the basic state and AZM amplitude. |
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| Keywords: | Interdecadal Pacific Oscillation (IPO) Atlantic Zonal Mode (AZM) Australia autumn precipitation |
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