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选取塔克拉玛干沙漠腹地塔中地区和北缘过渡带肖塘地区2个观测站,2013年土壤热通量观测资料,初步分析了两地区不同下垫面的土壤热通量变化特征。结果表明:(1)在日变化尺度上,2个站都有明显的日变化特征,1月塔中站土壤热通量日平均变化幅度小于肖塘站,4月2个站的土壤热通量变化幅度较为接近;7、10月塔中站土壤热通量变化幅度明显高于肖塘站。(2)不同天气条件下,2个站的土壤热通量变化都有很大差异。晴天,塔中站和肖塘站土壤热通量变化都呈现出单峰型,变化幅度较一致,日较差分别为119.7 W·m~(-2)和119.1 W·m~(-2);沙尘暴天气,土壤热通量受云层的影响,变化波动较大,塔中站变化幅度小于肖塘站,日较差分别为83.6 W·m~(-2)和133.1 W·m~(-2);降水天气,塔中站和肖塘站变化幅度都很剧烈,日较差分别为70.6 W·m~(-2)和66.6 W·m~(-2)。(3)年变化尺度上,塔中站和肖塘站土壤热通量都在7月达到最大值,分别为7.7 W·m~(-2)和4.2 W·m~(-2),在11月出现最小值分别为-5.3 W·m~(-2)和-10.2 W·m~(-2)。塔中站和肖塘站土壤热通量年总量差异很大,塔中站为16.8 W·m~(-2),能量由大气向土壤传递,土壤为热汇,而肖塘站则为-34.9 W·m~(-2),能量由土壤向大气传播,土壤表现为热源。
Two observation stations in the middle part of the Taklimakan Desert and the Xutang area in the northern margin of the Taklimakan Desert were selected to analyze the characteristics of soil heat fluxes under different underlying surfaces in the two regions. The results show that: (1) In the diurnal variation scale, the two stations have obvious diurnal variation characteristics. The average daily variation of soil heat flux in Tazhong station in January is less than that of Shaotang station. The soil heat flux of two stations in April The variation range of soil heat fluxes was close to that of Shaotang Station in July and October. (2) Under different weather conditions, there are great differences in soil heat fluxes at two stations. In sunny days, the soil heat fluxes in Tazhong Station and Xiaotang Station all showed a unimodal pattern, and the variation range was more consistent with daily differences of 119.7 W · m -2 and 119.1 W · m -2, respectively. ; The sandstorm weather and the soil heat flux are affected by clouds, and the variation is quite large. The variation range of Tazhong station is smaller than that of Shaotang station. The daily diurnal differences are 83.6 W · m -2 and 133.1 W · m -1, 2); precipitation weather, Tazhong station and Xutang station fluctuated rapidly, the daily differences were 70.6 W · m -2 and 66.6 W · m -2, respectively. (3) On the annual variation scale, the soil heat flux at Tazhong station and Xiaotang station reached their maximum values in July, 7.7 W · m -2 and 4.2 W · m -2, respectively. The minimum values appeared in November were -5.3 W · m -2 and -10.2 W · m -2, respectively. The total annual soil heat flux varies greatly between Tazhong and Xiaotang stations. The Tazhong station is 16.8 W · m -2. The energy is transferred from the atmosphere to the soil, and the soil is hotbed. -34.9 W · m -2. The energy spreads from the soil to the atmosphere and the soil presents as a heat source.