干旱区生态环境知识资源中心(Arid): 绿洲效应的模拟及内外因子的敏感性实验

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	绿洲效应的模拟及内外因子的敏感性实验
其他题名	Numerical Simulation of Oasis Effect and Its Sensitivity Test of Inside and Outside Factors
	刘树华 1; 胡予 1; 胡非 2; 梁福明 1; 王建华 1; 刘和平 1
来源期刊	大气科学
ISSN	1006-9895
出版年	2005
卷号	29 期号:6 页码:997-1009
中文摘要	利用一个已发展的陆面物理过程参数化方案与大气边界层数值模式耦合,模拟了半干旱区绿洲戈壁非均匀下垫面的陆面物理过程及其与大气边界层的相互作用,成功地描绘了绿洲戈壁局地气候效应,并进行了绿洲戈壁局地气候效应对于降水、绿洲水平尺度和植被结构等若干内外因子的敏感性实验。结果表明:绿洲的最小临界尺度为5~10 km之间,最大临界尺度为55~65 km之间,而最利于绿洲维持的尺度范围为20 km左右,这一结论与我国西部地区现存的绿洲尺度统计结果十分一致;绿洲植被覆盖率为0.6左右时,最利于绿洲发展。另外对植被空间分布方式和绿洲植被组成比例上也进行了数值实验,并对影响绿洲生存和持续发展的内、外因子气候效应的影响力量级进行了分级。这些结果对于深入了解绿洲气候的形成和维持机理具有重要的意义。
英文摘要	A developed parameterized scheme of land surface physical process and transfer models are used for simu-lating the oasis-gobi interaction process and the oasis-gobi regional climate effect in the semi-arid regioa The scheme is composed of two main parts: land surface processes and boundary layer processes, and the corresponding models include two versions: two-dimensional and three-dimensional. The sensitivities of the oasis-gobi regional climate effect to inside and outside factors such as precipitation, oasis horizontal spatial scale, vegetation structure etc. are studied. After these studies, many significant results are obtained. Result shows that large-scale wind speed of the background field is an important factor to affect mesoscale atmospheric circulation motion of the oasis-gobi region. Precipitation and irrigation play important roles in maintaining evolution of oasis, and precipitation has much greater influence on the oasis-gobi regional climate effect in the semi-arid region than irrigation. Horizontal spatial scale of oasis is a very important inside factor to influence oasis effect, and the smallest critical scale range of oasis is 5-10 km, the largest critical scale range of oasis is 55 - 65 km. Oasis will evolve very well when the horizontal spa-tial scale is about 20 km. These results reach unanimity with horizontal scales of oasis in the northwest region of China now. Moisture of soil also has some influence on oasis effect, especially on "cold island effect", and perhaps every oasis also has the critical moisture content of soil to affect the existent stability for itself. It has been proved that roughness length of land surface is a minor factor to the oasis-gobi regional climate effect in the semi-arid region through the special numerical simulation tests. At last, a series of numerical simulation experiments are carried out to research the functions of vegetation structure to the oasis-gobi regional climate effect in the semi-arid region. In this paper, vegetation structure is compartmentalized into three aspects; vegetation cover factor, composing propor-tion of vegetation and spatial distribution of vegetation. Through the numerical simulation tests of vegetation cover fraction, it is found that when the vegetation cover fraction of oasis is about 0. 6, oasis will evolve much better. And the corresponding numerical simulation experiments are carried out with the spatial distribution scheme of vegetation and proportion scheme of vegetation composing, and then the much better spatial distribution mode and composing proportion of vegetation in oasis are found. These results are in agreement with the truth and experience in the semi-arid region of Northwest China, and are also very helpful to the development and evolvement of oasis by manpower in these areas. In addition, inside and outside factors have been graded according to influence levels for climate effect to oasis development and evolvement. These results have important significance for understanding deep the form and maintaining mechanism of oasis climate.
中文关键词	陆面物理过程参数化方案 ; 绿洲效应 ; 内外因子 ; 敏感性实验
英文关键词	parameterized scheme of land surface physical process oasis effect inside and outside factors test of sensitivity
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:2087101
来源机构	北京大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/205984
作者单位	1.北京大学物理学院大气科学系,大气边界层和湍流研究组, 暴雨和旱涝灾害教育部重点实验室, 北京 100871, 中国; 2.中国科学院大气物理研究所, 大气边界层物理和大气化学国家重点实验室, 北京 100029, 中国
推荐引用方式 GB/T 7714	刘树华,胡予,胡非,等. 绿洲效应的模拟及内外因子的敏感性实验[J]. 北京大学,2005,29(6):997-1009.
APA	刘树华,胡予,胡非,梁福明,王建华,&刘和平.(2005).绿洲效应的模拟及内外因子的敏感性实验.大气科学,29(6),997-1009.
MLA	刘树华,et al."绿洲效应的模拟及内外因子的敏感性实验".大气科学 29.6(2005):997-1009.