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Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (1): 47-58.DOI: 10.7522/j.issn.1000-694X.2020.00100

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Characteristics of surface radiation budget in Gurbantunggut Desert

Jiacheng Gao1,2(), Yu Wang2, Sayit Hajigul3, Mamtimin Ali2, Yongqiang Liu1(), Xueshang Zhao1,2, Xinghua Yang2, Wen Huo2, Fan Yang2, Chenglong Zhou2   

  1. 1.College of Recourse and Environment Sciences,Xinjiang University,Urumqi 830046,China
    2.Desert Meteorology Field Experiment Station of CMA,Institute of Desert Meteorology,China Meteorological Administration,Urumqi 830002,China
    3.Xinjiang Meteorological Society,Urumqi 830002,China
  • Received:2020-06-17 Revised:2020-08-26 Online:2021-01-29 Published:2021-01-29
  • Contact: Yongqiang Liu

Abstract:

As the largest fixed and semifixed desert in China, the Gurbantunggut Desert presents the obvious variety on local surface radiation budget and energy balance. In order to clarify the law of evolution of the surface radiation budget over the desert, the variation characteristics of the desert surface radiation under different time scales and different weather conditions were analyzed by using the radiation data of the Kelameili observation station in the hinterland of Gurbantunggut Desert in 2017. The results showed that: (1) The monthly mean diurnal variation curves of surface radiation components were all in unimodal type, but extreme values of which appeared at different times and were unequal. The monthly total variation of surface radiation components were obvious: mean monthly total of the downward long-wave radiation were ranked as growth phase (April-September) > snow cover phase (January-March) > withering phase (October-December), and which of upward short-wave radiation ranked as snow cover phase>growth phase>withering phase, while which of long-wave radiation and net radiation were all ranked as growth phase>withering phase>snow cover phase. (2)The monthly mean diurnal variation of surface albedo were all in U-shaped curves from April to November. The annual mean value was 0.367. The average values of snow cover phase, growth phase, and withering phase were 0.7, 0.246, and 0.27, respectively. The daily mean values was greater than 0.7 from January 1 to March 15 because Gurbantunggut Desert has been covered within the snow covered continuously during this period. (3)On clear day, The diurnal variation of surface radiation components was smooth inverted U-shaped curves, while which on cloudy and rainy day became irregular. On snow day, the diurnal variation of short-wave radiation and net radiation were inverted V-shaped curve, while which of long-wave radiation was inconspicuous. During the rainfall and snowfall periods, the daily mean values of surface albedo were ranked as the day before rainfall>the day after rainfall>rainy day and as the day after snowfall>snow day>the day before snowfall, respectively. (4)During the snowmelt period, the variation of radiation components was obvious: the daily mean value of surface albedo and upward short-wave radiation decreased day by day when snow cover melted rapidly, while which of net radiation increased. Before snow cover had melted completely, the diurnal variation of long-wave radiation was inconspicuous, but which after snow cover melted completely increased.

Key words: Gurbantunggut Desert, surface radiation budget, surface albedo

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