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Temperature Features of Sand Dune in Hinterland of Taklimakan Desert
JIN Chi-Chi, HE Qing, LI Zhen-Jie, LIU Jiang, HUANG Ji
J4    2010, 28 (2): 134-141.  
Abstract1679)      PDF(pc) (1566KB)(1996)       Save

The surface temperature is much different at different positions of sand dune or even same position but at different time or different weather condition The temperature features are discussed based on observations at different position of  sand dune on clear or sand-dust day, bare land or different vegetation cover. The daily maximum surface temperature appears on the coping of the sand dune, the minimum temperature and the greatest diurnal temperature range appear on the windward slop.The coping and windward slop of sand dune have the greatest diurnal temperature range, but the leeward slop is contrary.The daily variation of surface temperature is larger on clear day than that under dust weather condition on the coping, windward slop, leeward slop and at the left wing. The time of the maximum and minimum temperature at 20 cm depth of the windward slop and the leeward slop is contrary to that of the surface temperature under clear or dust weather condition. From 0 to 20 cm depth of the windward and leeward slop, the diurnal temperature range is gradually decreasing, the time of the maximum and minimum temperature is different on clear day and dust weather, and the daytime temperature difference is large on clear day or dust weather condition.The surface temperature of vegetation cover and bare land have biggish variation. The daily variation is larger in sunniness cover than that of shade cover of vegetation.

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VerticalDistribution Characteristic ofW inter Atmospheric Stability over theH interland ofTaklimakan Desert 
LIU  Jiang, HE  Qing, YANG Xin-Hua, AI Li-·Mai-Mai-Chi-Meng, LI Zhen-Jie
J4    2009, 27 (4): 308-313.  
Abstract1817)      PDF(pc) (866KB)(2518)       Save

Based on the sounding date from captive boatover the hinterland ofTaklimakanDesert inwinterof2008, the atmosphere stability therewas studied elementarily using three differencemethodswhich areTemperature differencemethod,Temperature differenceW ind speedmethod andRichardson numbermethod. Results showed: (1)The diurnal change of the atmosphere stabilitywas obvious in Tazhong, atnight the state of the atmosphere changed from stability to neutral then instabilitywith the height increase, and the surface layerwas instable due to the impactof the solar radiation in daytime; (2)The atmosphere stability has significantly stratificationwith the height increase, the stable and the instable layer appeared alternately; (3)The results calculated by the above threemethodswere different, which reflected that the atmosphere stabilitywas influenced by temperature,wind and turbulence.

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Prelim inary Summary of Studies on Characteristics of Atmospheric TurbulentEnergy Exchange Near Surface Layer ofArid DesertArea
LI Zhen-Jie, HE  Qing, AI Li-·Mai-Mai-Chi-Meng
J4    2009, 27 (2): 157-162.  
Abstract1760)      PDF(pc) (649KB)(2323)       Save

The researches on characteristics of atmospheric turbulent energy exchange near the surface layer of arid desert area were summarized in this paper, and the characteristics of the complex structure of atmospheric boundary layer, lowwater vapor content and high sand content in desert regionwere introduced also. The characteristics of radiation, energy budgetand the turbulent flux near surface layerwere summarized. Itwas pointed out some of the key scientific questions both athome and abroadwewill face up in the future, and some advices about the study direction in atmospheric turbulent energy exchange near the surface layer of arid desert area in the futurewere proposed also.

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