| 分层扰动位能理论及其应用——以南海夏季风的年际变化为例 |
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| 引用本文： | 汪雷,李建平,丁瑞强.分层扰动位能理论及其应用——以南海夏季风的年际变化为例[J].地球物理学报,2013,56(2):392-408. |
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| 作者姓名： | 汪雷 李建平 丁瑞强 |
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| 作者单位： | 1. 中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室, 北京 100029;
2. 中国科学院研究生院, 北京 100049 |
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| 基金项目： | 国家自然科学基金重点项目41030961;国家重点基础研究发展计划项目2010CB950400;国家海洋局项目资助 |
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| 摘 要： | 在扰动位能(PPE)理论的基础上,针对不同高度上局地环流能量转换问题,本文提出了分层扰动位能(LPPE)的概念.研究表明850hPa的分层扰动位能一阶矩(LPPE1)在热带地区为正,高纬度地区为负,200 hPa高度LPPE1在北美高纬度地区出现正值分布,100 hPa及以上LPPE1热带地区为负,高纬度为正.LPPE1冬季半球的分布与年平均相似,北半球夏季大陆上出现正的极大值.在局地,LPPE1在数值上远远大于分层扰动位能二阶矩(LPPE2)及更高阶矩,因此,LPPE的分布与LPPE1的分布相似.南海季风区低层动能的季节变化与LPPE呈现反向变化关系.相关分析表明,南海夏季风(SCSSM)与春季的LPPE1偶极型分布之间存在着显著的年际(正)相关关系,可以作为SCSSM强度的一个预报因子.春季赤道印度洋、西太平洋海表温度(SST)的负(正)异常对应春季、夏季LPPE1的南负北正(南正北负)偶极型分布,夏季(JJAS) LPPE1的偶极型分布与南海季风区动能的一致增大(减小)是两者耦合模态的主导模态,夏季南海季风区的西风增强(减弱), SCSSM增强(减弱),这是能量异常影响SCSSM的一个可能的机制.
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| 关 键 词： | 分层扰动位能 南海夏季风 有效能量 动能 |
| 收稿时间： | 2012-06-06 |
Theory on layer perturbation potential energy and its application:a case study on annual variation of the South China Sea summer monsoon |
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| WANG Lei
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LI Jian-Ping
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DING Rui-Qiang.Theory on layer perturbation potential energy and its application:a case study on annual variation of the South China Sea summer monsoon[J].Chinese Journal of Geophysics,2013,56(2):392-408. |
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| Authors: | WANG Lei LI Jian-Ping DING Rui-Qiang |
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| Institution: | 1. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;
2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Based on the theory of Perturbation Potential Energy (PPE), at the issue of energy transform at any isobaric surface in local circulation, the concept of Layer perturbation potential energy (denoted as the LPPE) is presented. The first-order moment term of LPPE (denoted as LPPE1) is positive over the tropics and negative over high-latitude regions in the low and middle troposphere. It is positive over high-latitude of North American at 200hPa, but is positive over the high-latitude and negative over the tropics at 100 hPa and higher isobaric surface.The distributions of the LPPE1 in the winter hemisphere is quite similar to that of the annual mean, and the LPPE1 is featured by maxima over the Continent in the summer hemisphere. Locally, as the LPPE1 is superior to the second-order (denoted as LPPE2) and high-order ones in order of magnitude, the distributions of the LPPE are quite similar to the LPPE1. The analyses show that there is a significant negative correlation between the LPPE and kinetic energy at 850hPa over the South China Sea Summer Monsoon (denoted as SCSSM) region. There is a significant positive correlation between the SCSSM index (denoted as SCSSMI) and the out-of-phase pattern of LPPE1 in the prior spring which is a substantial relation, the later could be taken as an indicator of the SCSSM variation. The spring sea surface temperature anomalies (denoted as SSTA) over Indian Ocean are closely related to the out-of-phase relationship between anomalies in the tropical oceans and those in the extra-tropical Asian Continent of LPPE1 in spring and JJAS. The out-of-phase relationship of LPPE1 and coherent distribution of Kinetic Energy over SCSSM region are the dominant pattern of their coupled modes, westerly wind increases over the SCSSM region while Kinetic Energy increases, further influences the SCSSM. |
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| Keywords: | Layer perturbation potential energy South China Sea summer monsoon Available potential energy Kinetic energy |
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