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夏季高原大气热源的气候特征以及与高原低涡生成的关系

刘云丰 李国平

刘云丰, 李国平. 夏季高原大气热源的气候特征以及与高原低涡生成的关系[J]. 大气科学, 2016, 40(4): 864-876. doi: 10.3878/j.issn.1006-9895.1512.15184
引用本文: 刘云丰, 李国平. 夏季高原大气热源的气候特征以及与高原低涡生成的关系[J]. 大气科学, 2016, 40(4): 864-876. doi: 10.3878/j.issn.1006-9895.1512.15184
LIU Yunfeng, LI Guoping. Climatic Characteristics of Atmospheric Heat Source over the Tibetan Plateau and Its Possible Relationship with the Generation of the Tibetan Plateau Vortex in the Summer[J]. Chinese Journal of Atmospheric Sciences, 2016, 40(4): 864-876. doi: 10.3878/j.issn.1006-9895.1512.15184
Citation: LIU Yunfeng, LI Guoping. Climatic Characteristics of Atmospheric Heat Source over the Tibetan Plateau and Its Possible Relationship with the Generation of the Tibetan Plateau Vortex in the Summer[J]. Chinese Journal of Atmospheric Sciences, 2016, 40(4): 864-876. doi: 10.3878/j.issn.1006-9895.1512.15184

夏季高原大气热源的气候特征以及与高原低涡生成的关系

doi: 10.3878/j.issn.1006-9895.1512.15184
基金项目: 国家重点基础研究发展计划(973计划)项目2012CB417202,公益性行业(气象)科研专项GYHY201206042,国家自然科学基金项目91337215、41175045

Climatic Characteristics of Atmospheric Heat Source over the Tibetan Plateau and Its Possible Relationship with the Generation of the Tibetan Plateau Vortex in the Summer

  • 摘要: 利用NCEP/NCAR再分析资料和基于此再分析资料的高原低涡统计数据集,采用线性趋势、Morlet小波、EOF分解、合成分析等方法,分析了1981~2010年夏季高原大气热源气候特征以及与高原低涡生成的联系。结果表明:夏季高原大气热源平均强度为105 W m-2,随时间有减弱趋势,具有明显的年代际变化,存在显著的准3年周期振荡。高原低涡高发年,高原大气热源强度明显高于气候态,主要表现为高原大气热源的水平分布差异。在低涡高发年,涡度平流的空间分布和大气经向垂直环流结构显示:高原沿东南向西北存在500 hPa正涡度平流带,为高原低涡生成提供了有利的涡度场。同时,高原大气热源异常的水平分布促使高原上空产生上升气流,有助于高原上形成低层辐合、气旋式环流,整层上升运动,高层辐散、反气旋式环流的三维流场,促进高原低涡在低层生成,此时高原主体低空为正涡度区。并且,大气热源在垂直方向的变化也影响低涡的生成。最后,根据本文结果和我们前期的相关研究,从热成风原理和高原大气热力适应理论两方面对高原大气热源与高原低涡生成频数的统计结果给出了机理解释。
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