Plateau Meteorology

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2016 , Vol. 35 >Issue 5: 1233 - 1247

DOI: https://doi.org/10.7522/j.issn.1000-0534.2015.00071

Characteristics of Micrometeorology and Energy Transfer in the Surface Layer over the Zhangye Oasis-Desert Area

  • ZHANG Fen ,
  • LIU Shaomin ,
  • XU Ziwei ,
  • WANG Jiemin ,
  • ZHU Zhongli
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  • State Key Laboratory of Remote Sensing Science, School of Geography, Beijing Normal University, Beijing 100875, China;Chongqing Climate Center, Chongqing 401147, China;Cold and Arid Region Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China

Received date: 2014-10-24

  Online published: 2016-10-28

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Abstract

Based on dataset of'The Multi-Scale Observation Experiment on Evapotranspiration over heterogeneous land surfaces of the Heihe Water Allied Telemetry Experimental Research (HiWATER-MUSOEXE)-flux observation matrix'conducted in the Zhangye oasis-desert area in 2012, the variation characteristics of micrometeorology and energy fluxes were analyzed combing synchronous airborne and satellite remote sensing image. The results showed that: (1) The oasis exhibited significant'oasis effect'with the phenomena of cold, wet, wind barrier, and enhancing rain while comparing to desert. The interaction process of different scales occurred in the internal oasis and between oasis and desert under different weather background. The temperature inversion and humidity increasing were found in the oasis when advection occurred, and the humidity also increased in the nearby desert at the same time. There was a phase lag of air temperature after the irrigations in oasis. The precipitation in oasis was greater than that in the desert. The soil moisture in oasis was greater than that in desert, and it was controlled by irrigations in oasis, but it was controlled by precipitation in desert. (2) The daily cycles and magnitude of incoming shortwave radiation were similar in the oasis and desert. The incoming longwave radiation in oasis was greater than that in desert. The outgoing shortwave/longwave radiation in desert were obviously greater than that in oasis, and the net radiation was relatively small. (3) The latent heat flux in oasis was significantly greater than that in desert, whereas the soil heat flux and sensible heat flux in oasis were lower. The energy transfer of oasis was dominated by latent heat flux, while it was dominated by sensible heat flux in desert. The phenomenons of negative sensible heat flux, large latent heat flux even over the net radiation were observed in sunny afternoon in the oasis. Due to the discrepancy of wind field and the water vapor and heat conditions in oasis and desert, the occurrence time and intensity of advection was different at each site in oasis.

Key words： Oasis-Desert; Micrometeorology; Radiation flux; Energy flux

Cite this article

ZHANG Fen , LIU Shaomin , XU Ziwei , WANG Jiemin , ZHU Zhongli . Characteristics of Micrometeorology and Energy Transfer in the Surface Layer over the Zhangye Oasis-Desert Area[J]. Plateau Meteorology, 2016 , 35(5) : 1233 -1247 . DOI: 10.7522/j.issn.1000-0534.2015.00071

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