干旱区生态环境知识资源中心(Arid): 河西走廊春季透雨日期的变化特征

Arid

	河西走廊春季透雨日期的变化特征
其他题名	Climatic characteristics of spring soaking rain date in Hexi Corridor
	曹玲 1; 刘明春 2; 郭小芹 2; 许蔚生 2; 蒋菊芳 2
来源期刊	干旱区地理
ISSN	1000-6060
出版年	2011
卷号	34 期号:3 页码:436-441
中文摘要	利用甘肃河西走廊25个测站1971-2007年降水资料，采用EOF、REOF、波谱分析方法，对春季第一场透雨日期的空间特征、时间变化规律进行了诊断分析。结果表明:甘肃河西走廊春季透雨日期在空间场上具有较好的一致性，其第一主分量方差贡献占总体方差的36％。但不同地理条件下透雨日期有所差异，大致可划分为3个区，东南部早，西北部晚。近30～40 a来春季透雨日期呈波动变化，总体趋势是20世纪70年代透雨日期偏迟，80年代透雨日期偏早，90年代偏迟， 2001年以来偏早。透雨出现日期与春季雨量多少呈反位相变化。极度干旱气候区和干旱气候区春季透雨日期呈显著的9 a振荡周期，干旱、半干旱过渡区存在准4 a周期变化。
英文摘要	The Hexi Corridor is most main commodity grain base and the cash crop centralized production area in the northwest area.Although the area of majority belongs to the irrigated agricultural region,but it still has the very direct relations among the agricultural harvest and famine and the atmospheric precipitation.The occurrence frequency of spring drought in the Hexi Corridor achieves above 70% ,which is very big influential in the agricultural production.Although there are many research achievements in the regularities of northwest arid area’s changing and its influence on the agricultural production,but the study on spring soaking rain as well as drought’s inhibitory actions have not been seen widely up to now in view of the Hexi Corridor.This article is presented to analyze the following issues of the Hexi Corridor :the spatial distribution characteristics on the spring first soaking rain dates,their temporal variation regularities and periodicities,on the basis of precipitation materials during 1971 -2007 from 25 metrological stations,EOF,REOF and spectrum analysis methods.The results indicate that:the spring soaking rain dates have a good uniformity dealing with their spatial distribution,its first host component variance contribution occupies 36% of the overall variance,the first three items account for above 66% ,three characteristic vectors may reflect main characteristics of the Hexi Corridor involving with the spring soaking rain dates.Under the overall consistent background,the Hexi Corridor has the partial differences in spatial distribution of the spring soaking rain,and may divide approximately into 3 areas:the first area is the extreme arid climatic region in the central and western Hexi Corridor,including 8 counties (city)of Dunhuang,Guazhou,Yumen,Jinta,Subei,Jiuquan,Gaotai,Linze,Jiuquan station being a representative one.The second area is the partial arid climatic region in the eastern Hexi Corridor,including 7 counties (city)of Zhangye,Shandai,Yongchang,Wuwei,Minqin,Jintai,Baiyin,Wuwei station being a representative one.The third area is the arid and half arid transition region in the eastern Hexi Corridor,including 8 counties (city)of Sunan,Minle,Gulang,Tianzhu,Yongdeng,Gaolan,Jinyuan,Lanzhou,Yongdeng station being a representative one.The research also indicates that,the big terrain has certain influence on changing in distribution characteristics of the spring soaking rain in the Hexi Corridor,spring soaking rain dates are early in southeast area,late in northwest area,the reason is that the northwestern Hexi Corridor occupies the deeper interior near desert’s edge,with the Qilian Mountains’ impeding the water vapor northward intrusion.The precipitation here is scarce,therefore the spring soaking rain dates are late.However,under the different geography conditions,there are differences in the spring soaking rain dates.The Hexi Corridor may approximately divide into 3 areas,the southeast’s is early,northwest’s is late.In the recent 30 -40 years,the spring soaking rain dates assumed the undulation change,the overall tendency is that the 1970s soaking rain dates were postponed; the 1980s soaking rain dates moved up,the 1990s soaking rain dates postponed.After 2001 the soaking rain dates were moved up.There is a transposition change between soaking rain occurrence dates and the amount of spring rainfall.The spring soaking rain dates of the extreme arid climatic region and the arid climatic region assume 9-year periodical change,the spring soaking rain dates of the arid and half arid transition region have the 4-year periodical change.
中文关键词	河西走廊 ; 春季透雨 ; 时空分布
英文关键词	Hexi Corridor spring soaking rain temporal and spatial distribution
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:4219571
来源机构	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/2XILL650/226456
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.甘肃省武威市气象局, 武威, 甘肃 73300, 中国
推荐引用方式 GB/T 7714	曹玲,刘明春,郭小芹,等. 河西走廊春季透雨日期的变化特征[J]. 中国气象局兰州干旱气象研究所,2011,34(3):436-441.
APA	曹玲,刘明春,郭小芹,许蔚生,&蒋菊芳.(2011).河西走廊春季透雨日期的变化特征.干旱区地理,34(3),436-441.
MLA	曹玲,et al."河西走廊春季透雨日期的变化特征".干旱区地理 34.3(2011):436-441.