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Oasis-Desert System and Its Land Surface Character

Author: JingYu
Tutor: ChaoJiPing
School: Lanzhou University
Course: Atmospheric Physics and Atmospheric Environment
Keywords: Oasis Desert Stationary state Characteristics of the land surface
CLC: X171
Type: Master's thesis
Year: 2011
Downloads: 16
Quote: 0
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Abstract


Oasis is a unique natural geographic area type , semi-arid , arid climate zone special environment of the human survival . In the more arid areas of northwest China , covering more than 95% of the land is desert Gobi only about 5% of the land is an oasis production activities of human society , almost all concentrated in the oasis on how to develop , therefore oasis of the region production , life and survival of the people play a significant impact. Oasis desert coexistence environment is a complex nonlinear system , and the atmospheric boundary layer interaction interaction , and then interact with the atmospheric circulation , thus affecting the global climate and environment . Therefore , the coexistence of oasis and desert environment is how to develop and oasis and desert respective characteristics worthy of our study . This paper uses numerical simulation to maintain some of the development-related coefficient oasis from the theoretical analysis , the results showed that : oasis scale , the more favor oasis maintain ; oasis of relative humidity is low , if there is sufficient soil moisture to support evaporation and transpiration , oasis in self-sustaining state ; oasis scale greater reach quasi-steady state needs the longer time , the relative humidity , the greater the oasis reach a quasi-steady state needs the shorter time . Comparative analysis of different vegetation coverage of the underlying surface of the semi- arid areas of physical quantities variation from the actual observations , the results showed that : 2007 the 7,8,9 months Xinglongshan measured station CO2 density in this period 08:00-20:00 are below SACOL station , sensible heat fluxes below SACOL station ; July SACOL station sensible heat flux and latent heat flux difference large more than Xinglongshan observation station . SACOL station July 07,08,09 decreasing latent heat flux , the near formation temperature change and water vapor density , CO2 density opposite trend . Near surface air temperature changes temperature slowly than the near-surface (2cm soil depth ) . Soil temperature rise during the day , the slower the closer it gets to the lower warming , the faster the closer to the surface warming . Soil temperature at night fell , the most obvious decline in the near-surface .

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CLC: > Environmental science, safety science > The basic theory for the Environment and Science > Environmental Biology > Ecosystems and pollution ecology
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