|
|||||
|
|
| 中国西北地区季节间干湿变化的时空分布 ——-基于PDSI 数据 | |
| 引用本文： | 张永,陈发虎,勾晓华,靳立亚,田沁花,王有生,彭剑峰.中国西北地区季节间干湿变化的时空分布 ——-基于PDSI 数据[J].地理学报,2007,62(11):1142-1152. |
| 作者姓名： | 张永 陈发虎 勾晓华 靳立亚 田沁花 王有生 彭剑峰 |
| 作者单位： | 1. 兰州大学西部环境教育部重点实验室, 中德干旱环境研究中心, 兰州730000; 2. 中国科学院地球环境研究所, 西安710075; 3. 甘肃省气象局, 兰州730000 |
| 基金项目： | 国家自然科学基金 , 国家自然科学基金 , 国家自然科学基金 , 教育部跨世纪优秀人才培养计划 , 高等学校学科创新引智计划 |
| 摘 要： | 利用帕尔默干旱指数(PDSI) 全球数据库, 提取覆盖中国西北地区的56 个PDSI 栅格点数据, 对1953-2003 年间各个季节均值和年均值进行旋转经验正交函数(REOF) 分析。REOF 空间分区结果发现西北地区各个季节均值和年均值表现出较为一致的主要空间异常型, 依据 PDSI 年均值数据可以将中国西北地区划分为5 个空间型: 北疆型、南疆型、高原北部型、蒙 古西部型以及西北东部型。其中北疆型、南疆型主要位于西北地区西部, 高原北部型、蒙古西部型位于西北中部, 西北东部型位于西北东部。各个空间型特征点的PDSI 序列及二项式 拟合对比发现西北东部、西部存在完全相反的干湿变化: 西北西部主要受西风带影响, 自20 世纪80 年代开始有逐渐变湿的趋势； 西北东部主要受亚洲季风的影响, 有逐渐变干的倾向, 特别是夏秋季, 西北地区东南部变干的趋势更加明显。西北地区受西风带、亚洲季风以及青藏高原的影响明显, 在全球变暖的情景下, 不同区域的干湿状况的响应存在较大的差异。 |
| 关 键 词： | 西北地区 REOF PDSI 西风 季风 干湿状况 |
| 收稿时间： | 2007-05-15 |
| 修稿时间： | 2007-05-15 |
The Temporal and Spatial Distribution of Seasonal Dry- Wet Changes over the Northwestern China: Based on PDSI |
|
| ZHANG Yong,CHEN Fahu,GOU Xiaohua,JIN Linya,TIAN Qinhua,WANG Yousheng,PENG Jianfeng.The Temporal and Spatial Distribution of Seasonal Dry- Wet Changes over the Northwestern China: Based on PDSI[J].Acta Geographica Sinica,2007,62(11):1142-1152. | |
| Authors: | ZHANG Yong CHEN Fahu GOU Xiaohua JIN Linya TIAN Qinhua WANG Yousheng PENG Jianfeng |
| Institution: | 1. CAEP, National Laboratory of Western China's Environmental System, Lanzhou University, Lanzhou 730000, China; 2. Institute of Earth Environment, CAS, Xi'an 710075, China; 3. Gansu Meteorological Bureau, Lanzhou 730000, China |
| Abstract: | Using global Palmer drought severity index(PDSI)database,the seasonal and annual PDSI mean values of 56 grid points covering the period 1953-2003 over northwestern China is analyzed by rotated experience orthogonal function(REOF).The results show that the seasonal and annual means display similar anomaly regions,and furthermore there are five main anomaly regions in the northwestern China based on the annual PDSI mean,i.e.,the northern and southern parts of Xinjiang,northern part of plateau,western part of Inner Mongolia and eastern part of northwestern China.The opposite changes of dry-wet conditions are discovered after comparing the curves of feature point series and binomial fit between the eastern and western parts of the northwestern China:The western part of the northwestern China influenced by westerly,a trend of wetting gradually occurred since 1980.On the contrary,a trend of drying gradually occurred in the eastern part of the northwestern China which is mainly influenced by Asian monsoon,and especially in summer and autumn,there is notable trend of drying over the southeastern part of the northwestern China.The northwestern China is obviously affected by westerly,Asian monsoon and Tibetan Plateau.There are differences among the responses of the dry-wet conditions to the global warming in different regions. |
| Keywords: | northwestern China REOF PDSI westerly monsoon dry-wet condition |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ | |
| 点击此处可从《地理学报》浏览原始摘要信息 | |
| 点击此处可从《地理学报》下载免费的PDF全文 | |