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Research On Micrometeorology Characteristics Of The Surface Layer In The North Margin Of Taklimakan Desert

Posted on:2015-03-11Degree:MasterType:Thesis
Country:ChinaCandidate:J M GuFull Text:PDF
GTID:2250330422975392Subject:Physical geography
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We Utilize the wind velocity,temperature and humidity date from2011,whichwere gathered from the10m observing tower gradient detecting system in Xiaotangand Hade in the north margin of Taklimakan Desert,We were analyzed thecharacteristics of micro meteorological characteristics and profile change rule,studied of radiation budget and the change characteristics of soil temperature andmoisture,the following conclusions are:1.The rule of profiles and vertical gradient of wind velocity,temperature andhumidity(1) The diurnalvariation rule of the wind velocity, temperature and humiditygradient were obvious. Appearing temperature and humidity inversionCharacteristics. The annual average wind speed is2.8m/s,Average temperature is11.2℃,relative humidity variation amplitude of25~55%;(2) The wind velocity profile is given priority to with logarithmic and exponential,Temperature profile transitional type,insolation type,radiant type has appeared.Theaverage specific humidity is0.67,2.56,6.74,2.78g/kg in the four seasons;(3) The leading wind direction is NE in2011,SW in January and N in July,2mand10m wind frequency are different;2. The surface radiation and energy balance characteristics(1) The annual average albedo is0.303;(2) The effective radiation1,4,7,10month daily amount are2.3,6.2,6.9,3.1MJ.m2.d-1,the total net radiation are3.8,7.6,8.8,6.6,MJ.–2.d–1;(3) The atmospheric long wave radiation,total radiation,ground long-waveradiation,reflected radiation,net radiation,effective radiation are:9769.1,5772.4,12118.1,1668.0,2361.5MJ. M-2.Net radiation peaked in June, when the others allpeaked in July,the maximum value are1043.3,686.7,1302.3,196.6,240.5,271.5/MJ. M–2;3. The changes of soil temperature and humidity(1) Soil temperature change is inverted "U" type in0~40cm,the more deeper,the less chang of temperature. It shows05:00cold center and13:00warmsemi-closure isothermal change,as the core of the layers of average temperature of13.8℃,13.7℃,13.6℃,13.7℃and13.8℃,the soil temperature in different seasonscold and warm center time is different; (2) The soil moisture below0.35%throughout the year,10,20,40cm depthrespectively in may,July and August up to the maximum,the soil moisture mainlyconcentrated in the middle tier10~20cm,the average soil moisture of0.9989%,0.1380%,0.1504%,0.0838%;(3) The soil moisture mainly concentrated in10cm in winter,the summer is20cm, soil moisture main enrichment between20to40cm in autumn;...
Keywords/Search Tags:the north Taklimakan Desert, the10m observing tower gradientdetecting system, profile, radiation budget
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