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Research on Micrometeorology Characteristics in the Surface Layer in Xiaotang of the North Taklimakan Desert

Author: LiuQiang
Tutor: HeQing
School: Xinjiang University
Course: Environmental Science
Keywords: Taklimakan Desert in northern 10m gradient detection system Near the surface flux Bulk transfer coefficients
CLC: P404
Type: Master's thesis
Year: 2010
Downloads: 34
Quote: 1
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Abstract


In this paper, the Taklimakan desert in northern Xiao Tong 10m gradient automatic weather station data, analysis of the January 2008 winter and summer in July near surface wind, temperature, humidity, vertical gradient and profile variation; distributions of atmospheric stability in the region analyzed; aerodynamic method sensible heat flux and latent heat flux, bulk transfer coefficients and turbulent exchange coefficient; analysis of meteorological elements of difference in the context of different weather, the following conclusions: 1. Meteorological Elements Day variation of wind, temperature and humidity profiles characteristics: (1) the obvious changes in temperature, humidity, wind speed day, there is the phenomenon of near-surface temperature inversion and inverse wet, wind speed showing semidiurnal wave state. Wind direction frequency Jan. southwest wind mainly northerly winds dominated in July. (2) January temperature profile is divided into radiation and insolation; to July than wet 4m height near the humidity shear; the wind gradient meet the logarithmic law. (3) the same ground temperature trends and temperature changes in the range of greater than temperature. January soil moisture content is between 0.05% to 0.35%, July between 0.05% to 0.45%. 2 degrees of atmospheric stability Bu Xiao Tong frequency distribution of regional stability in neutral mostly neutral and stable state of the atmosphere in January, the sum accounts for more than 85%. Mainly in neutral weather in July, accounting for more than 65% of all weather. Flux and bulk transfer coefficient of turbulent exchange coefficient diurnal variation (1) January diurnal variation of net radiation is generally between -50 ~ 170W/m2 the July net radiation in size between -60 ~ 330W/m2. (2) Soil heat flux 15W/m2 January minimum -11W/m2. 7 months for 18W/m2 minimum -40W/m2. (3) the sensible heat flux maximum only 135W/m2 January or so, minimum -13W/m2 July maximum 243W/m2 about minimum -6 W/m2; latent heat flux in January -5 ~ 5W/m2 in July of -5 ~ 25W/m2. (4) In January: the neutral layer forged, the average of the sensible heat transfer coefficients for 2.532 × 10-3 momentum transport coefficient to 4.044 × 10-3; 7: In the neutral layer have forged a sense of heat transfer coefficients an average of 2.369 × 10-3, and momentum transfer coefficients as 4.009 x 10-3; atmosphere was neutral momentum exchange coefficient, mean 0.48m2 s-1, the heat exchange coefficient 0.76m2 · s-1. 7 atmospheric neutral momentum exchange coefficient mean 0.78m2 · s-1, the heat exchange coefficient 1.08m2 · s-1. 4. sunny, snow, dust storms, the whole meteorological elements and flux differences are significant, sunny air temperature, ground temperature, net radiation, soil heat flux, sensible heat flux is greater than the cloudy and sandstorms; humidity, soil moisture and latent heat flux is less than the cloudy and dust storms; the sandstorm weather and cloudy wind speed, bulk transfer coefficients greater than sunny, and the diurnal variation of greater volatility.

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CLC: > Astronomy,Earth Sciences > Atmospheric science (meteorology ) > General theory and methods > Near-surface layer meteorology, near-surface layer of atmospheric physics
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