干旱区生态环境知识资源中心(Arid): 绿洲沙漠边缘逆湿的数值研究

Arid

	绿洲沙漠边缘逆湿的数值研究
其他题名	Numerical Study of Inverse Humidity over the Marginal Zone Between Oasis and Desert
	陈世强; 吕世华; 奥银焕; 张宇; 李锁锁; 尚伦宇; 马迪
ISSN	1001-4675
出版年	2009
卷号	26 期号:2 页码:277-281
中文摘要	利用包含陆面过程的中尺度数值模式MM5和观测资料,对金塔绿洲边缘逆湿进行了数值研究.模拟结果显示:逆湿出现在沙漠和绿洲交界附近,主要出现在临近绿洲的沙漠上.逆湿和绿洲下游沙漠边缘较充沛的水汽有利于绿洲边缘沙生植物的生长.在临近绿洲的沙漠低层存在大范围的逆湿,随着高度的增加,逆湿范围由绿洲向外围沙漠逐渐减少,强度也在减弱.绿洲风携带的水汽对沙漠的影响有一定距离限制,越靠近绿洲,临近绿洲的沙漠比湿越大,逆湿消失的高度越低.在背景风场较弱的晴好天气下,当存在由绿洲向沙漠辐散的平流以及沙漠上的上升气流和绿洲下沉运动的过渡带位于绿洲边缘时,易形成逆湿.
英文摘要	In this study,a numerical evaluation of the inverse humidity over the marginal zone between Jinta Oasis and the surrounding desert was conducted using the mesoscale numerical model MM5 coupled with LSM and observed data.The Jinta Oasis(39°56′～40°17′N,98°39′～99°08′E),which is 2 152 km~2 in area,is located in a typical arid continental drainage basin in the northeastern portion of Jiuquan Prefecture and the central Hexi Corridor,Gansu Province,northwest China.This area is subject to a continental climate and has an annual precipitation of only 59.5 mm coupled with an annual evaporation that can be as high as 2 538.6 mm.Simulated results revealed that inverse humidity occurs over the boundary between the oasis and the desert,and that this phenomenon occurs primarily over the desert.Inverse humidity and plentiful vapor are advantageous to the growth of psammophytes in the marginal zone of the oasis as well as to the development of the oasis.The air is saturated near the surface of the desert around the oasis,while the extent of the inverse humidity decreases with height.There is a distance limitation of the effect of vapor carried by wind from the oasis to the desert.Specifically,the closer the desert is to the oasis,the higher the specific humidity lower the height at which the inverse humidity disappears will be.On fine days with gentle breezes,inverse humidity can easily form when there is a wind flow diverging from the oasis to the desert and the transition zone of the updraft over the desert and the downdraft over the oasis is located over the marginal zone of the oasis.
中文关键词	逆湿 ; 绿洲 ; 沙漠 ; 绿洲风 ; 河西走廊
英文关键词	inverse humidity oasis desert oasis breeze Hexi Corridor
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:3657530
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/223604
作者单位	中国科学院寒区旱区环境与工程研究所, 甘肃省干旱气候变化与减灾重点实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	陈世强,吕世华,奥银焕,等. 绿洲沙漠边缘逆湿的数值研究[J]. 中国科学院西北生态环境资源研究院,2009,26(2):277-281.
APA	陈世强.,吕世华.,奥银焕.,张宇.,李锁锁.,...&马迪.(2009).绿洲沙漠边缘逆湿的数值研究.,26(2),277-281.
MLA	陈世强,et al."绿洲沙漠边缘逆湿的数值研究".26.2(2009):277-281.