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特邀澳大利亚西澳电力Yun Li博士作学术报告
作者:重点实验室               发布时间:2017-5-9 10:35:28              浏览量:220

报告题目:The influence of boreal winter extratropical North Pacific Oscillation on Australian spring rainfall 

报告时间:2017年5月10日 (周三) 10:00-11:00 

报告地点:气象楼423报告厅 

主 持 人 : 江志红 教授 

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专家简介: 

李云博士,澳大利亚西澳电力商业情报与数据分析高级咨询顾问,高级预报和模型分析研究员。主要负责西澳电力网络的可靠性和供电量的统计建模和预报研究(包括天气极端事件对电力网络的可靠性和供电量的影响),为西澳电力高层决策和规划管理提供内部高级数据分析咨询和建议。2000-2015年任澳大利亚联邦科学与工业研究组织(CSIRO)首席研究员,从事气候统计学的研究,主要研究领域包括天气和气候极端事件的统计建模、统计降尺度模型、气候变化诊断、降水和气温的统计预报等。  

报告内容简介: 

The North Pacific Oscillation (NPO) is a key atmospheric intrinsic mode. This study concerns mechanisms that the NPO influences Southern Hemisphere climate anomalies after several months. It is found that the boreal wintertime NPO has a significant negative connection with austral spring rainfall anomalies in Australia, particularly in the Northern Territory, Queensland, New South Wales and Victoria. A positive NPO phase tends to be followed by dry conditions, while a negative phase by wet conditions in austral spring over much of northern and eastern Australia. The physical mechanism by which the boreal winter NPO affects Australian rainfall arises from the NPO seasonal footprinting mechanism that generates significant tropical central and eastern Pacific sea surface temperature (SST) warming anomalies during austral spring. Then, the positive NPO-related SST warming anomalies over the tropical central-eastern Pacific further induce a weakened Walker circulation, with its western subsiding branch over Australia, suppressing convection and thereby reducing rainfall. Furthermore, the NPO plays an important role in contributing to the significant long-term trends of the Northern Territory and Queensland rainfalls. The decreasing amplitude of the NPO contributes much of the observed rainfall wetting trends in the Northern Territory (~50 %) and Queensland (~60 %) regions during 1951–2010. 

Reference: Song L.,Li Y.,Duan W. The influence of boreal winter extratropical North Pacific Oscillation on Australian spring rainfall. CLIM DYNAM,2016,47(3-4): 1181-1196. 

 

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 

大气科学学院 

2017年5月9日


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