干旱区生态环境知识资源中心(Arid): 50 a来我国干湿气候界线的空间变化分析

Arid

	50 a来我国干湿气候界线的空间变化分析
其他题名	Spatial Change of Dry and Wet Climate Boundary in China in the Recent 50 Years
	杨建平 1; 丁永建 1; 陈仁升 1; 刘连友 2
来源期刊	冰川冻土
ISSN	1000-0240
出版年	2002
卷号	24 期号:6 页码:731-736
中文摘要	采用干燥度指数为干湿气候区的划分标准，通过近50 a来年降水量干湿气候界线与干燥度干湿气候界线变动对比分析，结果表明：在气候变暖，降水区域差异性显著的情况下，我国干旱/半干旱分界线与半干旱/湿润分界线也表现出显著的区域差异性，且具有U型分布特征。在东北北部，250 mm年雨量线为干旱/半干旱分界线，450 mm年雨量线为半干旱/湿润分界线，半干旱气候向西退缩，范围缩小；在东北南部、华北区与河套地区，300 mm年雨量线为干旱/半干旱分界线，700 mm年雨量线作为半干旱/湿润分界线，干旱气候与半干旱气候向东南方向扩展，空间范围在扩大，成为U型分布的凸出部位；在西南区与河套以西的西北东部，250 mm年雨量线为干旱/半干旱分界线，500 mm年雨量线为半干旱/湿润分界线，干旱半干旱气候变化不大。决定我国干湿气候界线空间变化的主要因素是由西太平洋副热带高压位置与强度导致的东南季风、孟加拉弯暖流所导致的西南季风以及西北环流等综合作用的降水量的区域差异性。
英文摘要	Based on annual precipitation, annual mean wind, and solar radiation data during 1951-1999 of 295 stations, aridity index is calculated in this paper. According to the aridity index, China can be delineated into three climate zones, namely, arid zone, semi-arid zone and humid zone. Aridity index 0.20 is the boundary between arid and semi-arid zone. Aridity index 0.50 is the boundary between semi-arid and humid climate zone. The dry and wet climate boundaries in annual precipitation are compared with the ones of the aridity index in the text. The results show that there is a substantial regional difference for the arid and semi - arid boundary and the semi - arid and humid boundary, and that there is a "U" type spatial distribution under the circumstances of climate warming and of great spatial difference in precipitation. In the northern part of Northeast China, 250-mm isoline is the boundary between the arid and semi-arid zone and the arid climate zone is consistent with the original zone. 450-mm isoline becomes the boundary between semi-arid and humid. Semi-arid zone retreats westward and its range shortened in northern Northeast China. 300-mm isoline is the boundary between arid and semi-arid zone and 700-mm isoline becomes the boundary between semi-arid zone and humid zone in the southern part of Northeast China, North China, and Hetao District. Arid and semi-arid zone expands southeastward and its range enlarges. In Southwest China and the eastern part of Northwest China to the west of Hetao District, 250-mm isoline is the boundary between arid and semi-arid zone. 500-mm isoline becomes the boundary between semi-arid and humid. Arid and semi-arid climate becomes normal. The spatial change of dry and wet climate boundary in China is depended on the regional difference in precipitation. There is upward trend in precipitation in northern Northeast China. Precipitation has a downward tendency in southern Northeast China, North China and Hetao District, Precipitation is slightly increasing in Southwest China and eastern Northwest China to the west of Hetao District. Precipitation depends on southeast monsoon and southwest monsoon. The former is dependent on the location and the intensity of West Pacific Subtropical High and the latter is caused by Bengalese warm current, westerly circulation and so on.
中文关键词	干湿气候界线 ; 空间变化 ; 气候变暖 ; 中国
英文关键词	dry and wet climate boundary spatial change climate warming China
语种	中文
国家	中国
收录类别	CSCD
WOS类目	METEOROLOGY ATMOSPHERIC SCIENCES
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:1010924
来源机构	中国科学院西北生态环境资源研究院 ; 北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/203036
作者单位	1.中国科学院寒区旱区环境与工程研究所, 兰州, 甘肃 730000, 中国; 2.北京师范大学资源环境研究所, 北京 100875, 中国
推荐引用方式 GB/T 7714	杨建平,丁永建,陈仁升,等. 50 a来我国干湿气候界线的空间变化分析[J]. 中国科学院西北生态环境资源研究院, 北京师范大学,2002,24(6):731-736.
APA	杨建平,丁永建,陈仁升,&刘连友.(2002).50 a来我国干湿气候界线的空间变化分析.冰川冻土,24(6),731-736.
MLA	杨建平,et al."50 a来我国干湿气候界线的空间变化分析".冰川冻土 24.6(2002):731-736.