干旱区生态环境知识资源中心(Arid): 夏季绿洲气候效应的观测和数值模拟

Arid

	夏季绿洲气候效应的观测和数值模拟
其他题名	Observation and Numerical Simulation of Microclimate of Oasis in Summer
	文莉娟 1; 吕世华1 ; 孟宪红 1; 马恒 2; 奥银焕 1; 张宇 1; 尚伦宇 1; 李锁锁 1
ISSN	1006-9585
出版年	2008
卷号	13 期号:3 页码:300-308
中文摘要	利用金塔绿洲能量水分循环观测试验的资料和中尺度数值模式对绿洲小气候效应进行了17天较长序列的研究，在模拟过程中每天替换土壤湿度。研究结果表明：在分析时段内2004年7月6目前和9日后分别盛行西北风和东风两种背景风；白天，绿洲低层相对沙漠是一个冷源，随着高度的增加逐渐转为暖中心，温度场在600～700hPa之间转变。当背景风较大时，绿洲上空的温度中心会偏向绿洲中心下游。白天绿洲低层风场平均态为在东风背景场的基础上向南北两侧辐散，随着高度的增加风场逐渐由辐散转为向绿洲的辐合，转变高度在700hPa以下，且低于温度场的转变高度。白天绿洲上以下沉运动为主，绿洲风次级环流是绿洲上夏季晴天长期存在的平均态。当背景风较小时绿洲低层可形成向四周辐散的风场，当背景风场过大时，无绿洲环流生成。绿洲为高湿场，在绿洲边缘沙漠上存在的逆湿和高水汽柱，既阻止沙漠上干热气流侵入绿洲，又防止绿洲上水汽的流失。白天沙漠、绿洲的地表能量通量差异较大，绿洲上以潜热为主，沙漠上以感热为主，二者量级相当。绿洲上的边界层高度低于沙漠的，对绿洲生态系统起一定的保护作用。
英文摘要	Using data got from Jinta Oasis System Energy and Water Cycle Field Experiment and mesoscale numerical model microclimate of oasis was studied for 17 days. During the simulation, soil moisture was replaced every day using observed data. Results show that northwest wind and east wind prevailed respectively before 6 and after 9 July in 2004. In the day oasis was colder than desert in lower layers and became warm with height and changed to the warm center between 600 and 700 hPa. When background wind velocity was large, the center of temperature appeared on the lower reaches of the oasis center. In the day average wind in lower layers diverged from oasis to south and north on the basis of east wind. Wind gradually converged to oasis with height and the transfer height was below 700 hPa and was lower than that of temperature. Downdraft dominated in the oasis and the second circulation consisted of wind converging from oasis in lower layer often happened in sunny days in summer. When background wind velocity was very small, wind converging from oasis to every direction would happen; But when it was very large, there was no secondary circulation. There was more vapor in the atmosphere in oasis. Inverse humidity and wet air column on desert near the oasis prevented dry and hot air to invade oasis and the lost of vapor in oasis. In the day surface flux of oasis and desert were very different. The latent heat flux was main in oasis and the sensible heat dominated on desert. Their values were approximate. Lower boundary layer height of oasis than that of desert contributed to the development of oasis ecology system.
中文关键词	绿洲 ; 沙漠 ; 绿洲风 ; 冷岛
英文关键词	oasis desert oasis circulation cold island
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:3374078
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/2XILL650/222626
作者单位	1.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; 2.防化研究院, 北京 102205, 中国
推荐引用方式 GB/T 7714	文莉娟,吕世华,孟宪红,等. 夏季绿洲气候效应的观测和数值模拟[J]. 中国科学院西北生态环境资源研究院,2008,13(3):300-308.
APA	文莉娟.,吕世华.,孟宪红.,马恒.,奥银焕.,...&李锁锁.(2008).夏季绿洲气候效应的观测和数值模拟.,13(3),300-308.
MLA	文莉娟,et al."夏季绿洲气候效应的观测和数值模拟".13.3(2008):300-308.