• CN 62-1175/P
• ISSN 1006-7639
• 双月刊
• 中国科技核心期刊
• 中国学术期刊综合评价数据库统计源期刊
• 中文科技期刊数据库收录期刊

• 论文 •

### 中国西北东部近５０ａ降水异常分布及变化特征

1. 1．中国气象局兰州干旱气象研究所，甘肃省干旱气候变化与减灾重点试验室，中国气象局干旱气候变化与减灾重点实验室，甘肃兰州730020;
2．甘肃省气象信息与技术装备保障中心，甘肃兰州730020
• 出版日期:2014-10-08 发布日期:2014-10-08
• 作者简介:杨瑜峰(1964－)，男，河北雄县人，高级工程师，主要从事气候变化及天气气候应用与服务研究．E－mail:450868623@qq.com

### Characteristics of Precipitation Anomalies in the Last 50 Years in Eastern Part of Northwest China

YANG Yufeng 1， 2

1. 1． Institute of Arid Meteorology，CMA;Key Laboratory of Arid Climate Change and Disaster Reduction of CMA;Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province，Lanzhou 730020，China;
2． Gansu Meteorological Information and Technic Suppor and Equipment Center， Lanzhou 730020，China)
• Online:2014-10-08 Published:2014-10-08

Abstract:

Based on principal component analysis and rotated principal component analysis methods，the spatial distribution，correlation regions and interannual variability characteristics of precipitation from 1961 to 2010 in east part of northwest China were analyzed by using the observation data of 170 stations from Shaanxi，Gansu，Ningxia and Qinghai．The results show that the precipitation anomaly ineast part of northwest China presented mainly overall consistency firstly，secondarily，it followed opposite change trend in the east and the west as well as the south and the north part．There were four related areas of precipitation anomaly in east part of northwest China including the area in southeast of Gansu and the central and southern Shaanxi ( area I) ，the area in central Gansu，Ningxia and north of Shaanxi ( area II) ， the area in plateau of Qinghai ( area III)and Hexi Corridor ( area IV) ．In recent 50 years，precipitation of the area II and IV presented reverse phase change in each decade． While，the variation trend of precipitation in the area I and III was consistent from 1961 to 2000，but their changes were opposite in the 2000s． The climate turned to be wet both in the area III and IV and to be more significant drought in the area I and II．

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