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An Assessment of Storage Terms in the Surface Energy Balance of a Subalpine Meadow in Northwest China


doi: 10.1007/s00376-010-9152-x

  • The heat storage terms in the soil--vegetation--atmosphere system may play an important role in the surface energy budget. In this paper, we evaluate the heat storage terms of a subalpine meadow based on a field experiment conducted in the complex terrain of the eastern Qilian Mountains of Northwest China and their impact on the closure of the surface energy balance under such non-ideal conditions. During the night, the average sum of the storage terms was -5.5 W m-2, which corresponded to 10.4% of net radiation. The sum of the terms became positive at 0730 LST and negative again at about 1500 LST, with a maximum value of 19 W m-2 observed at approximately 0830 LST. During the day, the average of the sum of the storage terms was 6.5 W m-2, which corresponded to 4.0% of net radiation. According to the slopes obtained when linear regression of the net radiation and partitioned fluxes was forced through the origin, there is an imbalance of 14.0% in the subalpine meadow when the storage terms are not considered in the surface energy balance. This imbalance was improved by 3.4% by calculating the sum of the storage terms. The soil heat storage flux gave the highest contribution (1.59%), while the vegetation enthalpy change and the rest of the storage terms were responsible for improvements of 1.04% and 0.77%, respectively.
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Manuscript History

Manuscript received: 10 May 2011
Manuscript revised: 10 May 2011
通讯作者: 陈斌, bchen63@163.com
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An Assessment of Storage Terms in the Surface Energy Balance of a Subalpine Meadow in Northwest China

  • 1. College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, Key Open Laboratory of Arid Climatic Change and Disaster Reduction of CMA,Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Lanzhou 730020,College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, Key Open Laboratory of Arid Climatic Change and Disaster Reduction of CMA, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Lanzhou 730020

Abstract: The heat storage terms in the soil--vegetation--atmosphere system may play an important role in the surface energy budget. In this paper, we evaluate the heat storage terms of a subalpine meadow based on a field experiment conducted in the complex terrain of the eastern Qilian Mountains of Northwest China and their impact on the closure of the surface energy balance under such non-ideal conditions. During the night, the average sum of the storage terms was -5.5 W m-2, which corresponded to 10.4% of net radiation. The sum of the terms became positive at 0730 LST and negative again at about 1500 LST, with a maximum value of 19 W m-2 observed at approximately 0830 LST. During the day, the average of the sum of the storage terms was 6.5 W m-2, which corresponded to 4.0% of net radiation. According to the slopes obtained when linear regression of the net radiation and partitioned fluxes was forced through the origin, there is an imbalance of 14.0% in the subalpine meadow when the storage terms are not considered in the surface energy balance. This imbalance was improved by 3.4% by calculating the sum of the storage terms. The soil heat storage flux gave the highest contribution (1.59%), while the vegetation enthalpy change and the rest of the storage terms were responsible for improvements of 1.04% and 0.77%, respectively.

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