青藏高原深层土壤热通量的变化特征分析
发布时间：2018-07-28 18:18
【摘要】：青藏高原地表热状况不仅对局地天气和气候变化有重要影响,而且还在次季节到季节尺度上对周边特别是下游地区的短期气候变化产生影响,因此日益受到研究者的关注。土壤热扩散率和土壤热通量是决定土壤热状况的两个重要因素。不同于以往的研究,本文利用青藏高原地区1980—2001年39个气象站0.8 m和3.2 m的土壤温度资料,采用热传导对流法计算了0.8~3.2 m深层土壤热扩散率和土壤热通量,分析了它们的年变化和年际变化特征,并分析了深层土壤热通量和高原季风的相关关系,得到了一些有意义的结论。青藏高原深层土壤温度随深度的增加振幅减小、位相延迟;在1980—2001年间,土壤热扩散率的变化总体呈减小趋势;土壤深层热通量年变化与土壤表层热通量的年变化具有相反的相位;总热通量与对流热通量的变化具有相同的相位;深层土壤热通量月平均值在冬季为负值(定义热流向上为正),夏季土壤热通量都为正值。土壤热通量与高原冬季风指数的变化趋势相反,相关系数为-0.53;而与高原夏季风指数变化趋势一致,相关系数为0.58,都通过了95%的显著性检验。这些结论对于促使我们认识高原陆气相互作用是非常有意义的。
[Abstract]:The surface heat condition of Qinghai-Xizang Plateau not only has an important influence on local weather and climate change, but also has an effect on the short-term climate change in the surrounding area, especially in the lower reaches, from the sub-season to the seasonal scale, so it has been paid more and more attention by researchers. Soil thermal diffusivity and soil heat flux are two important factors to determine soil thermal condition. Different from previous studies, the soil temperature data of 39 meteorological stations in the Qinghai-Tibet Plateau from 1980 to 2001 were used to calculate the thermal diffusivity and the soil heat flux at a depth of 0.8 m and 3.2 m by using the heat conduction convection method. The characteristics of annual and interannual variations were analyzed, and the correlation between deep soil heat flux and plateau monsoon was analyzed, and some meaningful conclusions were obtained. The amplitude of the deep soil temperature decreases with the increase of the depth and the phase delay, and the variation of the soil thermal diffusivity decreases during the period of 1980-2001. The annual variation of soil deep heat flux is opposite to that of soil surface heat flux, and the change of total heat flux is the same as that of convective heat flux. The monthly mean heat flux of deep soil is negative in winter (the heat flux is defined as positive upward) and the soil heat flux is positive in summer. The variation trend of soil heat flux is opposite to that of the winter monsoon index of the plateau, the correlation coefficient is -0.53, and the variation trend of the summer monsoon index of the plateau is the same, the correlation coefficient is 0.58, which has passed the significance test of 95%. These conclusions are of great significance for us to understand the land-air interaction in the plateau.
【作者单位】： 中国科学院寒旱区陆面过程与气候变化重点实验室/中国科学院西北生态环境资源研究院;中国科学院大学;
【基金】：国家自然科学基金项目(91437108,41675017)
【分类号】：S152
本文编号：2151198
[Abstract]:The surface heat condition of Qinghai-Xizang Plateau not only has an important influence on local weather and climate change, but also has an effect on the short-term climate change in the surrounding area, especially in the lower reaches, from the sub-season to the seasonal scale, so it has been paid more and more attention by researchers. Soil thermal diffusivity and soil heat flux are two important factors to determine soil thermal condition. Different from previous studies, the soil temperature data of 39 meteorological stations in the Qinghai-Tibet Plateau from 1980 to 2001 were used to calculate the thermal diffusivity and the soil heat flux at a depth of 0.8 m and 3.2 m by using the heat conduction convection method. The characteristics of annual and interannual variations were analyzed, and the correlation between deep soil heat flux and plateau monsoon was analyzed, and some meaningful conclusions were obtained. The amplitude of the deep soil temperature decreases with the increase of the depth and the phase delay, and the variation of the soil thermal diffusivity decreases during the period of 1980-2001. The annual variation of soil deep heat flux is opposite to that of soil surface heat flux, and the change of total heat flux is the same as that of convective heat flux. The monthly mean heat flux of deep soil is negative in winter (the heat flux is defined as positive upward) and the soil heat flux is positive in summer. The variation trend of soil heat flux is opposite to that of the winter monsoon index of the plateau, the correlation coefficient is -0.53, and the variation trend of the summer monsoon index of the plateau is the same, the correlation coefficient is 0.58, which has passed the significance test of 95%. These conclusions are of great significance for us to understand the land-air interaction in the plateau.
【作者单位】： 中国科学院寒旱区陆面过程与气候变化重点实验室/中国科学院西北生态环境资源研究院;中国科学院大学;
【基金】：国家自然科学基金项目(91437108,41675017)
【分类号】：S152
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