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| 热源异常对2008年初中国南方低温雨雪天气的影响 | |
| 引用本文： | 李来芳,刘屹岷,卜昌郁.热源异常对2008年初中国南方低温雨雪天气的影响[J].气候与环境研究,2011,16(2):126-136. |
| 作者姓名： | 李来芳 刘屹岷 卜昌郁 |
| 作者单位： | 1. 中国科学院大气物理研究所大气科学和地球流体力学国家重点实验室,北京,100029;中国科学院研究生院,北京,100049 2. 中国科学院大气物理研究所大气科学和地球流体力学国家重点实验室,北京,100029 3. 兰州大学物理学院,兰州,730000 |
| 基金项目： | 中国科学院知识创新工程重要方向项目KZCX2-YW-Q11-01;国家自然科学基金项目40925015、40821092、40810059005 |
| 摘 要： | 利用资料诊断和全球大气原始方程模式(Intermediate General Circulation Model,IGCM),研究了2008年1月中国南方地区出现罕见的持续性雨雪事件的成因.结果表明,2008年1月大气非绝热加热场的主要异常出现在热带海洋、青藏高原及中亚地区以及北大西洋.用全球异常热源强迫IGCM得到的... |
| 关 键 词： | 中国南方持续性雨雪天气 非绝热加热 青藏高原和中亚地区热源异常 大气环流异常 |
Impacts of Diabatic Heating Anomalies on an Extreme Snow Event over South China in January 2008 |
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| Li Laifang,Liu Yimin and Bo Changyu.Impacts of Diabatic Heating Anomalies on an Extreme Snow Event over South China in January 2008[J].Climatic and Environmental Research,2011,16(2):126-136. | |
| Authors: | Li Laifang Liu Yimin and Bo Changyu |
| Institution: | LI Laifang1,2,LIU Yimin1,and BO Changyu3 1 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 1000292 Graduate University of Chinese Academy of Sciences,Beijing 1000493 School of Physics,Lanzhou University,Lanzhou 730000 |
| Abstract: | An extreme event, an unusual snowstorm happening in South China in January 2008, is studied with observational data analysis and numerical modeling experiments. It is found that diabatic heating was centered in the tropical oceans, Central Asia, the Tibetan Plateau, and the North Atlantic Ocean. The results from the numerical experiments demonstrate that global diabatic heating anomalies are responsible for this extreme event. A series of numerical experiments are further designed to identify the key areas where the diabatic heating anomalies occur. The results indicate that the diabatic heating anomalies in Central Asia and the Tibetan Plateau could account for the extreme heavy snow event. Such anomalies generate anomalous air mass rising as well as southerly winds over South China. These features facilitate the water vapor transportation and result in the heavy rain and snow. Meanwhile, an anomalous heating in the North Atlantic enhances the positive phase of the North Atlantic Oscillation, which could contribute to the occurrence of this unusual snow event. On the contrary, a La Nina event happening over the same period, strengthening the heat source in the western Pacific and the heat sink in the eastern and central Pacific, is more likely to counteract the ascent and suppress the rain and snow over South China. |
| Keywords: | severe rain and snow weather over South China diabatic heating anomalous diabatic heating in the Tibetan Plateau and Central Asia atmospheric circulation anomaly |
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