| NUMERICAL SIMULATION OF THE INFLUENCE OF VEGETATION COVER FACTOR ON BOUNDARY LAYER CLIMATE IN SEMI-ARID REGION |
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| 作者姓名： | Liu Shuhu Huang Zichen Liu Lichao |
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| 作者单位： | LSSR Department of Geophysics，Peking University，Beijing 100871，Institute of Desert Research，Chinese Academy of Sciences.Lanzhou 730000，Institute of Desert Research，Chinese Academy of Sciences.Lanzhou 730000 |
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| 摘 要： | A numerical model has been developed for simulating land-surface processes and atmosphericboundary layer climate of vegetation and desert in semi-arid region.Dynamically,thermal andhydrological processes take place in the atmospheric boundary layer.Vegetation and surface layerof soil are included in the soil-vegetation-atmosphere coupled system,in which,vegetation isconsidered as a horizontally uniform layer,soil is divided into 13 layers and the horizontaldifferences of variables in the system are neglected.The influence of local boundary layer climateby vegetation cover factor is simulated with the coupled model in the semi-arid region of NorthwestChina (around 38°N,105°E).Results indicate that due to significant differences of water andenergy budgets in vegetation and desert region,the air is colder and wetter over the vegetation andcorrespondingly an obvious local circulation in the lower atmosphere is formed.Simulating results also show that maximum updraft and downdraft occur around thevegetation-desert marginal area,where the dynamical and thermodynamical properties of PBL(Planetary Boundary Layer) are uncontinuous.It is stronger at daytime,weaker and reverse atnighttime.In the simulation,the moisture inversion phenomena are analyzed.Finally.theinfluences of vegetation cover factor exchange on local boundary layer climate are simulated.Thesimulating results bring to light that water may be conserved and improved by developing treeplanting and afforestation,and improving cover factor of vegetation in local ecoenvironment,andthis is an important way of transforming local climate in arid and semi-arid area.Results indicatethat the coupled model can be used to study the soil-vegetation-atmosphere interaction and localboundary layer climate.
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| 收稿时间： | 1996/10/8 0:00:00 |
| 修稿时间： | 1996/10/21 0:00:00 |
NUMERICAL SIMULATION OF THE INFLUENCE OF VEGETATION COVER FACTOR ON BOUNDARY LAYER CLIMATE IN SEMI-ARID REGION |
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| Liu Shuhu,Huang Zichen,Liu Lichao.NUMERICAL SIMULATION OF THE INFLUENCE OF VEGETATION COVER FACTOR ON BOUNDARY LAYER CLIMATE IN SEMI-ARID REGION[J].Acta Meteorologica Sinica,1997,11(1):66-78. |
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| Authors: | Liu Shuhu Huang Zichen and Liu Lichao |
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| Institution: | Liu Shuhua LSSR epartment of Geophysics,Peking University,Beijing 100871Huang Zichen Liu Lichao Institute of Desert Research,Chinese Academy of Sciences,Lanzhou 730000 |
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| Abstract: | A numerical model has been developed for simulating land-surface processes and atmospheric boundary layer climate of vegetation and desert in semi-arid region.Dynamically,thermal and hydrological processes take place in the atmospheric boundary layer.Vegetation and surface layer of soil are included in the soil-vegetation-atmosphere coupled system,in which,vegetation is considered as a horizontally uniform layer,soil is divided into 13 layers and the horizontal differences of variables in the system are neglected.The influence of local boundary layer climate by vegetation cover factor is simulated with the coupled model in the semi-arid region of Northwest China(around 38°N,105°E).Results indicate that due to significant differences of water and energy budgets in vegetation and desert region,the air is colder and wetter over the vegetation and correspondingly an obvious local circulation in the lower atmosphere is formed.Simulating results also show that maximum updraft and downdraft occur around the vegetation-desert marginal area,where the dynamical and thermodynamical properties of PBL(Planetary Boundary Layer) are uncontinuous.It is stronger at daytime,weaker and reverse at nighttime.In the simulation,the moisture inversion phenomena are analyzed.Finally.the influences of vegetation cover factor exchange on local boundary layer climate are simulated.The simulating results bring to light that water may be conserved and improved by developing tree planting and afforestation,and improving cover factor of vegetation in local ecoenvironment,and this is an important way of transforming local climate in arid and semi-arid area.Results indicate that the coupled model can be used to study the soil-vegetation-atmosphere interaction and local boundary layer climate. |
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| Keywords: | vegetation cover factor boundary layer climate numerical simulation |
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