干旱区生态环境知识资源中心(Arid): 中蒙干旱半干旱区降水的时空变化特征(Ⅰ):年降水特征及5～9月降水的REOF分析

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	中蒙干旱半干旱区降水的时空变化特征(Ⅰ):年降水特征及5～9月降水的REOF分析
其他题名	Temporal and Spatial Change Features of Precipitation over China-Mongolia Arid-and Semiarid-Areas(I):Annual Rainfall Feature and May～September One REOF Analyses
	陈豫英 1; 陈楠 1; 王式功 2; 钱正安 3; 穆建华 1
来源期刊	高原气象
ISSN	1000-0534
出版年	2010
卷号	29 期号:1 页码:33-43
中文摘要	此系姐妹篇文章的上篇, 利用中蒙地区106站1954-2005年间的实测降水资料, 使用EOF及REOF等统计方法, 整体地分析了中蒙干旱半干旱区降水的时空变化特征.结果表明: (1)中蒙干旱区的降水分布很不均匀(我国西北区尤甚), 从该区东南侧最湿的陕南向南疆盆地东端极端干旱区过渡, 年雨量从922 mm锐减到25 mm以下, 最干的托克逊仅6.9 mm;蒙古国以中北部最湿, 年雨量达400 mm以上, 到南部仅100 mm左右, 再到西南角仅30 mm左右.(2)该区降水分布受不同尺度地形影响大, 降水的年及年际变化也大.约80%的降水集中在夏半年(5～9月), 南疆盆地东端干中心区的年降水相对变率最大, 接近0.80, 远高于蒙古国和我国其他地区, 也高于全球明显增暖前.其干旱程度及降水变率居世界8大干旱区前列.(3)该区降水异常分布的局域特征明显.区内夏半年的降水异常分布常出现河东、南疆、汉中关中、北疆、蒙古国中北部、河西阿拉善, 以及柴达木等7个模态.(4)过去50余年来, 中蒙地区东北部的降水总体呈线性减少趋势, 而西南部则呈增加趋势.
英文摘要	To better explore the temporal and spatial change features of the precipitation over China-Mongolia Arid-and Semiarid-Areas( hereafter CMASA), in the Part I of the companion papers, the annual precipitation feature and the May～September one REOF analyses over the CMASA have been, as a whole, conducted, utilizing the observed precipitation data at 106 stations totally over the CMASA during the period from 1954 to 2005 and the EOF and REOF techniques. The main conclusions are as follows: (1)The main body and dry center over the CMASA are in Northwest China(NWC). The precipitation distribution is very uneven over CMASA, particularly in NWC. On the China side, the most wettest region over the CMASA is in South Shaanxi, with the annual mean rainfall of 922 mm, but with the transition from there to the east end of Tarim Basin , the precipitation reduce sharply. At Toksun, the driest core over CMASA with the multiyear mean rainfall of only 6.9 mm. On the Mongolia side, the Central-and Northern-Mongolia is something wet, with the mean rainfall of more than 400 mm;but in South Mongolia Gobi, around 100 mm;and again in the driest southwestern Gobi Altai, only 30 mm or so. (2)There is heavily impact of the topography on the different scales like the Qinghai-Xizang Plateau(Plateau), Tianshan, Hangai Shan, even the Dabacheng Gorge on the precipitation distribution over the CMASA. (3)There are largely seasonal, interannual and interdecadal variations of the precipitation over the CMASA. About 80% of the precipitation is concentrated from May to September. The relative variation rate of interannual precipitation near the dry center is as 0.78 as high. (4) According to REOF analyses of precipitation for May～September over CMASA, the precipitation anomaly distribution often have seven modes: region on the east side of Yellow River, South Xinjiang, Gansu Corridor and Alashan, Hanzhong and Guanzhong, North Xinjiang, Central and North Mongolia, and Qaidam Basin. (5)In the past 52 years, overall, the May～September precipitation on the northeast side of CMASA gets dry;but the one on the southwest side, gets wet.
中文关键词	中蒙干旱半干旱区 ; 5～9月降水 ; REOF分析 ; 空间模态及时间系数 ; 降水变化趋势系数
英文关键词	The CMASA Precipitation for May～September EOF and REOF Analysis Spatial distribution modes and their time coefficients Precipitation change trend
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:3832928
来源机构	中国科学院西北生态环境资源研究院 ; 兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/225203
作者单位	1.宁夏气象防灾减灾重点实验室, 宁夏气象防灾减灾重点实验室, 银川, 宁夏 750002, 中国; 2.兰州大学大气科学学院, 兰州, 甘肃 730000, 中国; 3.中国科学院寒区旱区环境与工程研究所, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	陈豫英,陈楠,王式功,等. 中蒙干旱半干旱区降水的时空变化特征(Ⅰ):年降水特征及5～9月降水的REOF分析[J]. 中国科学院西北生态环境资源研究院, 兰州大学,2010,29(1):33-43.
APA	陈豫英,陈楠,王式功,钱正安,&穆建华.(2010).中蒙干旱半干旱区降水的时空变化特征(Ⅰ):年降水特征及5～9月降水的REOF分析.高原气象,29(1),33-43.
MLA	陈豫英,et al."中蒙干旱半干旱区降水的时空变化特征(Ⅰ):年降水特征及5～9月降水的REOF分析".高原气象 29.1(2010):33-43.