| 热力适应、过流、频散和副高II.水平非均匀加热与能量频散 |
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| 引用本文： | 刘屹岷,吴国雄,宇如聪,刘新.热力适应、过流、频散和副高II.水平非均匀加热与能量频散[J].大气科学,2001,25(3):317-328. |
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| 作者姓名： | 刘屹岷 吴国雄 宇如聪 刘新 |
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| 作者单位： | 中国科学院大气物理研究所大气科学和 |
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| 基金项目： | 国家重点基础研究发展规划项目G1998040900，中国科学院“百人计划”气候模式的有效化和国家自然科学基金资助项目49905002、49635170共同资助 |
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| 摘 要： | 利用位涡方程和热力适应原理，讨论了因非绝热加热的空间不均匀性导致的大气 动力特征的变化，进一步阐明了副热带地区的深对流凝结潜热加热的垂直非均匀性使副热带高压在中低空出现在热源区以东，在高空出现在热源区以西。在此基础上，深入研究了水平非均匀加热对大气环流的影响。结果表明加热区以北，虽然非绝热加热消失，但存在加热的水平梯度在西风环流的背景下在高低层造成深厚的负涡度强迫。因而高层热源北部边界附近的西风向南偏转进入加热区，造成加热区北部边界及其以北发生次级辐散；低层热源区的南风发生反气旋偏转，汇入加热区外的西风气流中，造成低层加热区北部边界及其以北发生次级辐合。结果该区域产生了垂直上升运动及负的涡度强迫源，对应着异常强烈的反气旋环流。该负涡度强迫源还通过能量频散，在西风带中以Rossby波的形式向中高纬传播，影响中高纬地区的异常环流型。
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| 关 键 词： | 非均匀加热 水平梯度 副热带高压 能量频散 |
| 修稿时间： | 1999年12月29日 |
Thermal Adaptation, Overshooting, Dispersion, and Subtropical Anticyclone Part II: Horizontal Inhomogeneous Heating and Energy Dispersion |
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| Liu Yimin,Wu Guoxiong,Yu Rucong and Liu Xin.Thermal Adaptation, Overshooting, Dispersion, and Subtropical Anticyclone Part II: Horizontal Inhomogeneous Heating and Energy Dispersion[J].Chinese Journal of Atmospheric Sciences,2001,25(3):317-328. |
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| Authors: | Liu Yimin Wu Guoxiong Yu Rucong and Liu Xin |
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| Abstract: | Based upon potential vorticity theory and thermal adaptation principle, the feature of atmospheric motion as a result of spatial inhomogeneous diabatic heating is investigated. It is further clarified that, due to the variation of the vertical gradient of strong convective condensation heating, the distribution of cyclone and anticyclone in upper troposphere is out of phase with that in the middle and lower the troposphere. On the basis of these results, the impacts of horizontal inhomogeneous heating on the circulation are discussed. It is shown that to the north of a heating region, although there is no diabatic heating, there still exists deep negative vorticity forcing due to the horizontal inhomogeneous in the westerly flow. Air convergence in the low level and divergence in the upper level are induced. This generates ascent as well as negative vorticity source, which corresponds to a strongly anomaly antic yclone center appearing to the north of the heating region. This negative vorticity source can propagate in the westerly flow through energy dispersion and affect the circulation in mid-high latitudes. |
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| Keywords: | inhomogeneous heating horizontal gradient energy dispersion subtropical anticyclone |
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