Comparison of the Soil Heat Flux Variations in Different Areas over the Taklimakan Desert
The observed soil heat flux data of the Tazhong and Xiaotang station in 2013 were analyzed and compared. The Tazhong station is located at the hinterland of Taklimakan desert, and the Xiaotang station at the northern margin which is an ecotone of the Taklimakan desert and oasis, they standard for two different underlying surfaces. Their different characteristics of the soil heat flux variation are as follows: (1)On the scale of day, the soil heat flux at two stations has obvious diurnal variation. The averaged diurnal variation at the Tazhong station is below than that at the Xiaotang station in January, but their variations are similar to each other in April, however, the amplitude of variation at the Tazhong station is larger than that at the Xiaotang station in July and October. (2)The soil heat flux at two stations has significant differences under different weather conditions. In sunny days, the diurnal variations have single peak, and the variation ranges are consistency at two stations. The differences of the maximum and minimum values (DMMV)of the averaged soil heat fluxes at the Tazhong and Xiaotang station are 119.7 W·m-2 and 119.1 W·m-2, respectively. In dust-sand storm days, the soil heat fluxes are affected by cloud which shadows the solar incident radiation, thus, it enhances the range. The variation at the Tazhong station is below than that at the Xiaotang station, the DMMV are 83.6 W·m-2 and 133.1 W·m-2, respectively. In rainy days, the soil heat flux variation is dramatic at two stations, the DMMV are 70.6 W·m-2 and 66.6 W·m-2, respectively. (3)On the scale of year, the averaged soil heat fluxes reach the highest in July at the Tazhong and Xiaotang stations, their values are 7.7 W·m -2 and 4.2 W·m -2, respectively, and reach the lowest in November, their values are -5.3 W·m-2 and -10.2 W·m-2, respectively. Moreover, the average annual soil heat fluxes are also significant at two stations, at Tazhong station, the value is 16.8 W·m-2, which means the energy transfers from the air to the soil, i.e. the soil is a heat sink, on the contrary, at the Xiaotang station, the value is-34.9 W·m-2, which means the energy transfers from the soil to the air, i.e. the soil is a heat source.
Taklimakan desertsoil heat fluxTazhong stationXiaotang station
国家科技期刊平台
NSTL
万方数据
维普
