| 2014年秋季我国华西地区降水异常的成因分析 |
| |
| 引用本文： | 司东,邵勰,孙冷,王启祎,李多.2014年秋季我国华西地区降水异常的成因分析[J].气象,2015,41(4):508-513. |
| |
| 作者姓名： | 司东 邵勰 孙冷 王启祎 李多 |
| |
| 作者单位： | 国家气候中心，北京 100081;南京信息工程大学气象灾害预报预警与评估协同创新中心，南京 210044;国家气候中心，北京 100081;国家气候中心，北京 100081;国家气候中心，北京 100081;国家气候中心，北京 100081 |
| |
| 基金项目： | 国家重点基础研究发展计划（973计划）(2013CB430202和2012CB955203)、国家自然科学基金项目(41405071)和公益性行业（气象）科研专项(GYHY201406001)共同资助 |
| |
| 摘 要： | 2014年秋季，全国平均降水量较常年同期偏多，其中华西地区降水偏多明显。季内，我国华西地区降水阶段性变化显著。分析表明，秋季华西地区降水偏多可能与热带印度洋海温偏高有关。印度洋海温偏高，一方面有利于西北太平洋地区对流层低层异常反气旋式环流的发展和东南水汽输送的加强，另一方面印度洋海温的偏高有利于印度洋地区对流的活跃和西南水汽输送的加强。在中高纬地区，贝加尔湖地区为异常低槽区，易引导冷空气南下影响我国华西地区。同时，西太平洋副热带高压强度偏强及西伸脊点的偏西，综合导致华西地区秋季降水偏多。而华西地区降水的季内变化与西太平洋副热带高压的异常活动有关。
|
| 关 键 词： | 秋季降水， 西太平洋副热带高压， 印度洋海温， 贝加尔湖低槽 |
| 收稿时间： | 2014/12/18 0:00:00 |
| 修稿时间： | 2014/12/31 0:00:00 |
Causality Analysis of Autumn Rainfall Anomalies in West China 2014 |
| |
| SI Dong,SHAO Xie,SUN Leng,WANG Qiyi and LI Duo.Causality Analysis of Autumn Rainfall Anomalies in West China 2014[J].Meteorological Monthly,2015,41(4):508-513. |
| |
| Authors: | SI Dong SHAO Xie SUN Leng WANG Qiyi and LI Duo |
| |
| Institution: | National Climate Centre, Beijing 100081;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044;National Climate Centre, Beijing 100081;National Climate Centre, Beijing 100081;National Climate Centre, Beijing 100081;National Climate Centre, Beijing 100081 |
| |
| Abstract: | During the autumn of 2014, mean precipitation over China was above normal, especially in West China with strong intraseasonal variations. Analysis shows that the positive precipitation anomaly over West China is possibly caused by the warming over the tropical Indian Ocean. The warming of the tropical Indian Ocean enhances the low level anticyclonic anomaly over the Northwest Pacific and southeast water vapor transportation to West China, and also intensifies the convectional activity over Indian Ocean and southwest water vapor transportation to West China. At the mid high latitude, abnormal trough maintains over the Lake Baikal, which is prone to guide the cold air down to West China. At the same time, the intensified western Pacific subtropical high (WPSH), whose high ridge extends more westward, also brings more water vapor from the low latitude to West China. As a result, the intensified water vapor and the northwestward cold air flow leads to the positive precipitation anomaly over West China during autumn of 2014. Furthermore, the intraseasonal variation of the autumn precipitation over West China is influenced by the WPSH. |
| |
| Keywords: | |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《气象》浏览原始摘要信息 |
| 点击此处可从《气象》下载免费的PDF全文 |
|
