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Spatial distribution of surface energy fluxes over the Loess Plateau in China and its relationship with climate and the environment

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Abstract

China’s Loess Plateau is located at the edge of the Asian summer monsoon in a transition zone of climate and ecology. In the Loess Plateau, climate and environments change along with space, which has an obvious impact on the spatial distribution of surface energy fluxes. Because of scarce land-surface observation sites and short observation time in this area, previous studies have failed to fully understand the land-surface energy balance characteristics over the entire the Loess Plateau and their effect mechanisms. In this paper, we first test the simulation ability of the Community Land Model (CLM) model by comparing its simulated data with observed data. Based on the simulation data for the Loess Plateau over the past thirty years, we then analyze the spatial distribution of surface energy fluxes and compare the pattern differences between the area averages for the driest year and wettest year. Furthermore, we analyze the relationship between the spatial distribution of the components of the surface energy balance with longitude, latitude, altitude, precipitation and temperature. The main results are as follows: the spatial distribution of surface energy fluxes are significantly different, with the surface net radiation and sensible heat flux increasing from south to north and latent heat flux and soil heat flux decreasing from southeast to northwest. The sensible heat flux at the driest point is nearly twice as high as that at the wettest point, whereas the latent heat flux and soil heat flux at the driest point are half as much as that at the wettest point. The impact of variations of annual precipitation on the components of the surface energy balance is also obvious, and the maximum magnitude of the changes to the sensible heat flux and latent heat flux is nearly 30%. To a certain extent, geographical factors (including longitude, latitude, and altitude) and climate factors (including temperature and precipitation) affect the surface energy fluxes. However, the surface net radiation is more closely related to latitude and altitude, sensible heat flux is more closely related to the monsoon rainfall and latitude, and latent heat flux and soil heat flux are more closely related to the monsoon rainfall.

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Authors and Affiliations

  1. Institute of Arid Meteorology, China Meteorological Administration; Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province; Key Open Laboratory of Arid Climatic Change and Disaster Reduction of China Meteorological Administration, Lanzhou, 730020, China

    Qiang Zhang, Liang Zhang, Jing Huang, WenYu Wang & Sha Sha

  2. Meteorological Bureau of Gansu, Lanzhou, 730020, China

    Qiang Zhang

  3. College of Atmospheric Sciences, Lanzhou University, Lanzhou, 730000, China

    Liang Zhang, LiYang Zhang & WenYu Wang

  4. Meteorological Bureau of Yongjia, Yongjia, 325100, China

    Jing Huang

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  1. Qiang Zhang
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  2. Liang Zhang
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  3. Jing Huang
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  4. LiYang Zhang
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  5. WenYu Wang
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  6. Sha Sha
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Correspondence to Qiang Zhang.

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Zhang, Q., Zhang, L., Huang, J. et al. Spatial distribution of surface energy fluxes over the Loess Plateau in China and its relationship with climate and the environment. Sci. China Earth Sci. 57, 2135–2147 (2014). https://doi.org/10.1007/s11430-014-4881-9

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  • DOI: https://doi.org/10.1007/s11430-014-4881-9

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