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Journal of Arid Land  2014, Vol. 6 Issue (4): 371-377    DOI: 10.1007/s40333-014-0062-0
Research Articles     
New evidence for the links between the local water cycle and the underground wet sand layer of a mega-dune in the Badain Jaran Desert, China
Jun WEN1*, ZhongBo SU2, TangTang ZHANG1, Hui TIAN1, YiJian ZENG2, Rong LIU1, Yue KANG1, Rogier van der VELDE2
1 Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Cold and Arid Regions
Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2 Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, 7500 AA, Enschede, the Netherlands
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Abstract  Scientists and the local government have great concerns about the climate change and water resources in the Badain Jaran Desert of western China. A field study for the local water cycle of a lake-desert system was conducted near the Noertu Lake in the Badain Jaran Desert from 21 June to 26 August 2008. An underground wet sand layer was observed at a depth of 20–50 cm through analysis of datasets collected during the field experiment. Measurements unveiled that the near surface air humidity increased in the nighttime. The sensible and latent heat fluxes were equivalent at a site about 50 m away from the Noertu Lake during the daytime, with mean values of 134.4 and 105.9 W/m2 respectively. The sensible heat flux was dominant at a site about 500 m away from the Noertu Lake, with a mean of 187.7 W/m2, and a mean latent heat flux of only 26.7 W/m2. There were no apparent differences for the land surface energy budget at the two sites during the night time. The latent heat flux was always negative with a mean value of –12.7 W/m2, and the sensible heat flux was either positive or negative with a mean value of 5.10 W/m2. A portion of the local precipitation was evaporated into the air and the top-layer of sand dried quickly after every rainfall event, while another portion seeped deep and was trapped by the underground wet sand layer, and supplied water for surface psammophyte growth. With an increase of air humidity and the occurrence of negative latent heat flux or water vapor condensation around the Noertu Lake during the nighttime, we postulated that the vapor was transported and condensed at the lakeward sand surface, and provided supplemental underground sand pore water. There were links between the local water cycle, underground wet sand layer, psammophyte growth and landscape evolution of the mega-dunes surrounding the lakes in the Badain Jaran Desert of western China.

Key wordsalpine grassland      disturbance degree      volume fractal dimension of soil particles      species diversity     
Received: 29 June 2013      Published: 12 August 2014

This research was supported by the European FP7 Programme: CORE-CLIMAX (313085), the National Natural Science Foundation of China (41175027), the Key Research Program of the Chinese Academy of Sciences (KZZD-EW-13) and Chinese Academy of Sciences Fellowship for Young International Scientists (2012Y1ZA0013).

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Jun WEN, ZhongBo SU, TangTang ZHANG, Hui TIAN, YiJian ZENG, Rong LIU, Yue KANG, Rogier van der VELDE. New evidence for the links between the local water cycle and the underground wet sand layer of a mega-dune in the Badain Jaran Desert, China. Journal of Arid Land, 2014, 6(4): 371-377.

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