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• W2387093844 abstract "A developed parameterized scheme of land surface physical process and transfer models are used for simulating the oasis-gobi interaction process and the oasis-gobi regional climate effect in the semi-arid region.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 the smallest critical scale range of oasis is(510 km),the largest critical scale range of oasis is 5565 km.Oasis will evolve very well when the horizontal spatial 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 proportion 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." @default.
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• W2387093844 date "2005-01-01" @default.
• W2387093844 modified "2023-09-22" @default.
• W2387093844 title "Numerical Simulation of Oasis Effect and Its Sensitivity Test of Inside and Outside Factors" @default.
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