干旱区生态环境知识资源中心(Arid): 中国北方地区40年来湿润指数和气候干湿带界线的变化

Arid

	中国北方地区40年来湿润指数和气候干湿带界线的变化
其他题名	Changes of humid index and borderline of wet and dry climate zone in northern China over the past 40 years
	王菱; 谢贤群; 李运生; 唐登银
来源期刊	地理研究
ISSN	1000-0585
出版年	2004
卷号	23 期号:1 页码:45-54
中文摘要	本文研究了中国北方地区1961～2000年40年间气候干湿带界线分布和10年际变化.40年来中国北方地区,在东经100°以东地区,半干旱区和半湿润区的分界线不断波动向东推进,20世纪90年代比60年代向东和向南扩展,半干旱区面积扩大,半湿润区面积缩小,气候趋向干旱化;东经100°以西地区,极端干旱区面积在缩小,湿润指数有增大趋势.如果把温度和湿润指数相结合,东经100°以东的黄淮海区和黄土高原区为持续的干暖型;东经100°以西的西北地区,则由干暖型向湿暖型转变:河西走廊和东疆盆地转型的时间发生在20世纪70年代初,北疆山地绿洲荒漠地区转型的时间发生20世纪80年代中期前后.气候干湿带界线的变化取决于降水和潜在蒸发的变化速率.40年来,在东经100°以东地区,降水和潜在蒸发都呈下降趋势,但降水减少速率大于潜在蒸发下降速率;在东经100°以西地区变湿的原因,研究认为除了降水有所增加外,潜在蒸发也在下降,而且潜在蒸发下降速率的绝对值大于降水增加速率.
英文摘要	In this paper mean locations of borderline for wet and dry climate zone in northern China over the past 40 years from 1961 to 2000 and their decadal changes were studied. Over 40 years in northern China, boundary line of semiarid and subhumid zones where W (humid index) is 0. 5 moved gradually toward the east. In the eastern part east of 100°E, especially in the 1990s it moved toward the east and the south compared with that in the 1960s, which resulted in the enlargement of semiarid area and the shrinkege of subhumid area, and the climate tended to become dried; and in the western part west of 100°E, the extremely dry area was dwindled and the climate tended to become wetted evidently. By combining the temperature with W we can call the eastern part east of 100°E where the North China Plain and the Loess Plateau are located a sustaining dry and warm type; the northwestern part west of 100°E can be called transitional zone from dry and-warm type in-to humid and warm one, of them the Hexi corridor and East Xinjiang Basin started to change in the early 1970s while the mountain region, oasis, and desert in northern Xin-jiang started to change around the mid 1980s. The deterring factor for changes of borderline in the wet and dry climate zone is the variation rate of precipitation vs. potential evaporation. Over the past 40 years both precipitation and potential evaporation tended to decrease in the eastern part east of l00°E, but the decreasing rate of precipitation is higher than that of potential evaporation. We think that the cause for wetting in the western part of 100°E was that the potential evaporation has been decreasing with the increase of precipitation, moreover the absolute value for decreasing rate of potential evaporation is higher than that of increasing rate of precipitation.
中文关键词	中国北方地区 ; 湿润指数 ; 气候干湿带界线变化
英文关键词	northern China humid index change for the borderline of wet and dry climate zone
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:1502664
来源机构	中国科学院地理科学与资源研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/204890
作者单位	中国科学院地理科学与资源研究所, 北京 100101, 中国
推荐引用方式 GB/T 7714	王菱,谢贤群,李运生,等. 中国北方地区40年来湿润指数和气候干湿带界线的变化[J]. 中国科学院地理科学与资源研究所,2004,23(1):45-54.
APA	王菱,谢贤群,李运生,&唐登银.(2004).中国北方地区40年来湿润指数和气候干湿带界线的变化.地理研究,23(1),45-54.
MLA	王菱,et al."中国北方地区40年来湿润指数和气候干湿带界线的变化".地理研究 23.1(2004):45-54.