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青藏高原地表热通量变化及其对初夏东亚大气环流的影响
THE VARIATION OF SURFACE HEAT FLUX OVER TIBET PLATEAU AND ITS INFLUENCES ON THE EAST ASIA CIRCULATION IN EARLY SUMMER
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摘要: 应用NCEP地面热通量资料, 研究了青藏高原地面感热、潜热的气候状况及其与初夏东亚大气环流之间的关系。发现高原地面热通量的异常将影响高原地区上空的垂直运动与辐散辐合运动, 从而引起东亚地区高度场及风场的异常。同时, 青藏高原地区地面热通量与后期东亚地区的环流变化也有密切关系, 这种关系可为预测东亚地区初夏环流异常提供有意义的指标。Abstract: Using the NCEP reanalysis data, the climatology of the surface heat flux over Tibetan Plateau and its relation with the East Asia Circulation in early summer are studied. It is found that: the surface heat flux over Tibet shows strong annual cycle; both the latent heat flux over Tibet enhances the upward vertical motion in the middle troposphere over Tibetan area; the heat flux over the Tibetan Plateau enhances the High system over Tibetan area and its adjacent regions. It also enhances the westerly jet stream in the north side of the Plateau. The abnormal surface heat over Tibet will speed up the seasonal transition process in the East Asia from winter to summer. The surface heat condition over Tibetan Plateau in the preceding seasons has some significant linkage with the succeeding height and zonal wind fields in early summer. These relations can be used as predictors for the circulation anomalies in early summer of East Asia
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Key words:
- Tibet suaface;
- Heat flux;
- Circulation;
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表 1 青藏高原上空各月感热和潜热的气候值
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