干旱区生态环境知识资源中心(Arid): 基于SPI指数的甘肃省河东地区干旱时空特征分析

Arid

	基于SPI指数的甘肃省河东地区干旱时空特征分析
其他题名	Analysis on Spatial and Temporal Patterns of Drought Based on Standardized Precipitation Index in the Hedong Area in Gansu Province
	王莺 1; 李耀辉 1; 胡田田 2
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2014
卷号	34 期号:1 页码:244-253
中文摘要	干旱是西北地区主要的自然灾害之一。本文以甘肃省河东地区作为研究区,基于该地区38个气象站19712010年逐月降水数据计算标准化降水指数(SPI指数),分析了不同时间尺度SPI指数的时间序列特征,探讨了SPI_3和SPI_(12)的年代际距平和倾向率的时空变化,以及特旱、重旱和中旱的发生频次。结果表明:(1)随着时间尺度的增加,SPI指数随机性在减弱,持续性在加强。干旱出现较多的时期为1991一2005年,出现较少的时期为19741982年。(2)20世纪80年代以前河东地区偏湿,90年代以后河东地区有偏干的趋势。河东地区行政区划分为7个部分,7080年代,除甘南地区外,其余地区的SPI_3倾向率均显著增加;8090年代,河东地区SPI_3倾向率持续减少,减少最明显的为定西地区;90年代到21世纪初,河东地区SPI_3倾向率又有增加趋势。对于SPI_(12)来说,自20世纪70年代到2010年,除甘南、陇南和天水地区的SPI_(12)倾向率为先减少后增加以外,其余地区均呈现先增加,后减小,然后再增加的趋势。(3)3个月时间尺度干旱的分布范围广,发生频次高,主要发生于河东地区的北部。12个月时间尺度的特旱主要发生在河东地区的北部,重旱和中旱主要发生在河东地区的东部。
英文摘要	Drought is one of the major natural disasters in Northwest China. Standardized precipitation index(SPI) under various temporal scales were calculated in the Hedong Area of Gansu Province with monthly precipitation data collected in 38 meteorological stations during 19712010. The patterns of SPI temporal series with different temporal scale were analyzed; the spatial and temporal changes in the decadal departure and tendency rate of SPI_3 and SPI_(12) were discussed; the frequencies of extreme drought, severe drought and moderate drought were also addressed. Results showed that:(1) With the increase of temporal scale, the randomness of SPI weakened, and its consistence strengthened. There was a higher drought frequency in 19912005 than that in 1974-1982.(2) the Hedong Area was humid before 1980s, and then tended to be more arid after 1990s. For the 7 administrative districts in the Hedong Area during 1970s, there was a significant increase in the SPI_3, except in Gannan region; during 1980s, there was a continuous decrement in the tendency rate of SPI_3. For the tendency rate of SPI_(12) from 1970s to 2000s, the tendency rate decreased at first, and then increased, in Gannan, Longnan and Tianshui region, while other regions showed an opposite pattern.(3) There was wide spread and high frequency for drought events under three-month scale, which was concentrated in the northern part of Hedong Area. Under the twelve-month scale, extreme drought main occurred in the northern part of the Hedong Area, the severe and moderate drought mainly occurred in the eastern part of the Hedong Area.
中文关键词	标准化降水指数 ; 河东地区 ; 干旱
英文关键词	standardized precipitation index(SPI) Hedong Area drought
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:5049257
来源机构	兰州大学 ; 中国气象局兰州干旱气象研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/232150
作者单位	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实验室;;中国气象局干旱气候变化与减灾重点开放实验室, 兰州, 甘肃 730020, 中国; 2.兰州大学大气科学学院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	王莺,李耀辉,胡田田. 基于SPI指数的甘肃省河东地区干旱时空特征分析[J]. 兰州大学, 中国气象局兰州干旱气象研究所,2014,34(1):244-253.
APA	王莺,李耀辉,&胡田田.(2014).基于SPI指数的甘肃省河东地区干旱时空特征分析.中国沙漠,34(1),244-253.
MLA	王莺,et al."基于SPI指数的甘肃省河东地区干旱时空特征分析".中国沙漠 34.1(2014):244-253.