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  • CN 62-1070/P
  • ISSN 1000-694X
  • Bimonthly 1981
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Spatial and Temporal Variation of Precipitation over Areas Surrounding the Badan Jaran Desert

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  • 1. Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    3. Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu University of Information Technology, Chengdu 610225, China;
    4. Meteorological Bureau of Shaanxi Province, Xi'an 710014, China

Received date: 2014-04-21

  Revised date: 2014-06-11

  Online published: 2015-01-20

Abstract

Based upon analyses on the monthly precipitation, sandstorm frequency and East-Asian Summer Monsoon Index series during 1951-2005 from 17 meteorological stations surrounding the Badan Jaran Desert, the following facts have been disclosed. (1) The spatial pattern of precipitation over the study area is apparently affected by the topography, resulting in the drier climate over the lower-altitude regions, lying more closely to the desert, with less precipitation in each season, and a wetter climate over the higher-altitude regions farther to the desert, especially over the areas southwest to the desert affected by the Qilian Mountain, with a larger seasonal precipitation. The precipitation can be raised by one or more orders due to elevation in altitude, but with little influence on its seasonality. The summer precipitation contribution to the annual total reaches the maximum by about 61.6% on average. (2) According to correlation between one station and another in the inter-annual precipitation variation, the regional relation and the similarity in landforms, the study area can be divided into four sub-regions, including (a) the northwestern boundary region (NWD), closest to the desert, with a lower altitude and extremely dry climate, (b) the southwestern nearby region, with a more satisfying soil moisture due to more direct influence of the Qilian Mountain (QM), (c) the Minqin region (MQ), located near and between Badan Jaran Desert and Tengger Desert, and (d) the region east to the desert (ED), away from the desert, but with very similar landforms with other regions. (3) During each decade, each seasonal precipitation varied from one sub-region to another, with the sequence always being QM, ED, MQ and NWD from the large to small, in good agreement with their average altitudes. QM agreed very well with the whole study area in the inter-decadal variation phases of each seasonal precipitation and its contribution to the annual total. (4) During 1971-2005, the annual precipitation over each sub-region had generally increased, especially owing to the spring precipitation with its rise rate having reached +0.41 mm·a-1, even with the summer precipitation having a little dropped. Besides, with the altitude getting higher, the spring and annual precipitations had risen by a larger rate, but the summer precipitation seemed to have reduced more gently; and QM had the greatest contribution to the whole study area in the rise rate of the annual total precipitation. (5) Each seasonal precipitation over the study area had increased with the East-Asian summer monsoon weakening. Besides, the elevated terrain seems to make the correlation coefficient between the East-Asian Summer Monsoon Index and the winter, summer or annual precipitation more negative, with the absolute coefficient getting larger, inferring that the East-Asian summer monsoon will more significantly affect higher-altitude areas such as the sub-region of QM. (6) Each seasonal precipitation mostly has a negative correlation to the sandstorm frequency, especially in that the increased winter and spring precipitations always corresponded very well with the dropped dust storm frequencies in the same, or the next season over each sub-region.

Cite this article

Li Wanyuan, Lü Shihua, Dong Zhibao, Fan Guangzhou, Chen Leihua . Spatial and Temporal Variation of Precipitation over Areas Surrounding the Badan Jaran Desert[J]. Journal of Desert Research, 2015 , 35(1) : 94 -105 . DOI: 10.7522/j.issn.1000-694X.2014.00064

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