论文部分内容阅读
The heat storage terms in the soil-vegetation-atmosphere system may play an important role in the surface energy budget.In this study, we evaluated 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-5.5W m-2, which corresponded to 10.4% of the net radiation.The sum of the terms became positive at 07:30 LT and negative again at about 15 LT, with a maximum value of 19W m-2 being observed at approximately 08:30 LT.During the day, the average of the sum of the storage terms was 6.5W m-2, which corresponded to 4.0% of the net radiation.According to the slopes obtained when linear regression of the net radiation and the 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 of1.04% and 0.77%, respectively.