Experimental Study of the Imbalance of Water Budget over theLoess Plateau of China

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  • Funds:

    Supported by the National Natural Science Foundation of China (40830957 and 41075009), and the China MeteorologicalAdminstration Special Public Welfare Research Fund (GYHY200806021)

  • doi: 10.1007/s13351-011-0607-5

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  • The imbalance of land-surface water budget was discovered in past studies, but there have been few further investigations on the relevant causes. To probe into the problem, annual variations of precipitation and land-surface evapotranspiration were analyzed by using the historical observation data from a comprehensive land-surface observation base of LOPEX (Loess Plateau Experiment). A remarkable imbalance in the land-surface water budget was found, and the total annual imbalance reached 20.6%. Then, the impact factors related to additional water budget components and observational methods were studied. The total annual imbalance could be reduced to 3.8% by using a combination of compensated land-surface water budget components and the surface evapotranspiration values obtained from the large-scale weighing lysimeter rather than from the eddy correlation method.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Experimental Study of the Imbalance of Water Budget over theLoess Plateau of China

  • 1. Key Laboratory of Arid Climatic Change and Disaster Reduction of Gansu Province/Key Open Laboratory of Arid Climatic Change and Disaster Reduction of CMA/Institute of Arid Meteorology,CMA,Lanzhou 730020 Gansu Provincial Meteorological Service,Lanzhou 730020 Lanzhou University,Lanzhou 730000;
    Key Laboratory of Arid Climatic Change and Disaster Reduction of Gansu Province/Key Open Laboratory of Arid Climatic Change and Disaster Reduction of CMA/Institute of Arid Meteorology,CMA,Lanzhou 730020 Lanzhou University,Lanzhou 730000;
    Baoshan Meteorological Service,Shanghai 201901;
    Key Laboratory of Arid Climatic Change and Disaster Reduction of Gansu Province/Key Open Laboratory of Arid Climatic Change and Disaster Reduction of CMA/Institute of Arid Meteorology,CMA,Lanzhou Lanzhou University,Lanzhou 730000
Funds: Supported by the National Natural Science Foundation of China (40830957 and 41075009), and the China MeteorologicalAdminstration Special Public Welfare Research Fund (GYHY200806021)

Abstract: The imbalance of land-surface water budget was discovered in past studies, but there have been few further investigations on the relevant causes. To probe into the problem, annual variations of precipitation and land-surface evapotranspiration were analyzed by using the historical observation data from a comprehensive land-surface observation base of LOPEX (Loess Plateau Experiment). A remarkable imbalance in the land-surface water budget was found, and the total annual imbalance reached 20.6%. Then, the impact factors related to additional water budget components and observational methods were studied. The total annual imbalance could be reduced to 3.8% by using a combination of compensated land-surface water budget components and the surface evapotranspiration values obtained from the large-scale weighing lysimeter rather than from the eddy correlation method.

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