Experimental Study of the Imbalance of Water Budget over theLoess Plateau of China |
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| Affiliation: | Key Laboratory of Arid Climatic Change and Disaster Reduction of Gansu Province/Key Open Laboratory of AridClimatic Change and Disaster Reduction of CMA/Institute of Arid Meteorology, CMA, Lanzhou 730020Gansu Provincial Meteorological Service, Lanzhou 730020Lanzhou University, Lanzhou 730000;Key Laboratory of Arid Climatic Change and Disaster Reduction of Gansu Province/Key Open Laboratory of AridClimatic Change and Disaster Reduction of CMA/Institute of Arid Meteorology, CMA, Lanzhou 730020Lanzhou University, Lanzhou 730000;Baoshan Meteorological Service, Shanghai 201901;Key Laboratory of Arid Climatic Change and Disaster Reduction of Gansu Province/Key Open Laboratory of AridClimatic Change and Disaster Reduction of CMA/Institute of Arid Meteorology, CMA, Lanzhou Lanzhou University, Lanzhou 730000 |
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| Abstract: | The imbalance of land-surface water budget was discovered in past studies, but there have been fewfurther investigations on the relevant causes. To probe into the problem, annual variations of precipitationand land-surface evapotranspiration were analyzed by using the historical observation data from a comprehensiveland-surface observation base of LOPEX (Loess Plateau Experiment). A remarkable imbalance inthe land-surface water budget was found, and the total annual imbalance reached 20.6%. Then, the impactfactors related to additional water budget components and observational methods were studied. The totalannual imbalance could be reduced to 3.8% by using a combination of compensated land-surface water budgetcomponents and the surface evapotranspiration values obtained from the large-scale weighing lysimeterrather than from the eddy correlation method. |
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| Keywords: | Loess Plateau water budget imbalance over land surface water resources evapotranspiration |
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