Plateau Meteorology

Plateau Meteorology >

2017 , Vol. 36 >Issue 2: 424 - 435

DOI: https://doi.org/10.7522/j.issn.1000-0534.2016.00044

Impacts of Vegetation on Vater and Heat Exchanges in the Source Region of Yellow River

  • JIA Dongyu ,
  • WEN Jun ,
  • MA Yaoming ,
  • LIU Rong ,
  • WANG Xin ,
  • ZHOU Juan ,
  • CHEN Jinlei
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  • Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;University of Chinese Academy of Sciences, Beijing 100049, China;College of Atmospheric Sciences, Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu University of Information Technology, Chengdu 610225, China;Key Laboratory of Tibetan Environment Change and Land Surface Process, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China

Received date: 2016-01-18

  Online published: 2017-04-28

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Abstract

The land surface radiation budget and the impacts of vegetation on water and heat exchanges are the keys of land surface process.By using the field observed data at Maduo from 2013 to 2014, the characteristics of surface radiation budget were analyzed under different types of synoptic conditions.The results show that: (1) The different value of upward shortwave radiation is about 7.76 W·m-2, between 100% vegetation covered and the control test.However, the different value of upward longwave radiation is only-0.62 W·m-2.(2) The difference value of simulated longwave radiation between bare land and controlled test is about 5.34 W·m-2.Moreover, the difference value between 100% vegetation covered and the control test is just-0.62 W·m-2.(3) The decrease of LAI value has an influence on the increasing land surface albedo.Furthermore, the radiation flux and the surface turbulence flux change little.The upward shortwave radiation increases just about 1.35 W·m-2.Meanwhile, the latent heat decreases about 8.43 W·m-2.(4) On the other hand, the increasing LAI have an impact on the decrease of upward shortwave radiation and upward longwave radiation.What's more, the variation of radiation flux is larger when LAI increasing than LAI decreasing.(5) The radiation flux reveals obvious diurnal variation.The net radiation varies from 200 W·m-2 to 461 W·m-2 under different types of synoptic conditions.The soil heat flux at different depths reaches the peak from June to July in 2013.

Key words： Source region of Yel; Surface radiation bu; Vegetation coverage; Model simulation

Cite this article

JIA Dongyu , WEN Jun , MA Yaoming , LIU Rong , WANG Xin , ZHOU Juan , CHEN Jinlei . Impacts of Vegetation on Vater and Heat Exchanges in the Source Region of Yellow River[J]. Plateau Meteorology, 2017 , 36(2) : 424 -435 . DOI: 10.7522/j.issn.1000-0534.2016.00044

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