An Assessment of Storage Terms in the Surface Energy Balance of a Subalpine Meadow in Northwest China |
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Authors: | WANG Runyuan and ZHANG Qiang |
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Institution: | 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 |
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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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Keywords: | subalpine meadow complex terrain surface energy balance storage terms |
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