地面加热与高原低涡和对流系统相互作用的一次个例研究

田珊儒; 段安民; 王子谦; 巩远发

doi:10.3878/j.issn.1006-9895.1404.13311

地面加热与高原低涡和对流系统相互作用的一次个例研究

doi: 10.3878/j.issn.1006-9895.1404.13311

1.
中国科学院大气物理研究所大气科学与地球流体力学数值模拟国家重点实验室(LASG), 北京100029;成都信息工程学院大气科学学院, 成都610225
2.
中国科学院大气物理研究所大气科学与地球流体力学数值模拟国家重点实验室(LASG), 北京100029
3.
成都信息工程学院大气科学学院, 成都610225

基金项目: 国家自然科学基金项目41175070,国家重点基础研究发展计划(973计划)项目91337216,财政部/科技部公益性行业(气象)科研专项GYHY201006014

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出版历程
- 收稿日期: 2013-11-05
- 修回日期: 2014-04-15

Interaction of Surface Heating, the Tibetan Plateau Vortex, and a Convective System: A Case Study

1.
State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;College of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225
2.
State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029
3.
College of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225

摘要

摘要: 本文利用NCEP-FNL再分析资料、FY-2E卫星TBB数据、CMORPH降水资料,通过热力学和动力学诊断分析并结合中尺度天气模式WRF的数值模拟试验,研究了2012年6月下旬青藏高原一次东移对流系统的生成发展机制以及与地面加热相互作用的物理过程。结果表明,高原中西部地面感热加热是高原低涡生成、发展和东移的主导因子。而东移的高原低涡通过加强偏北、偏南气流形成的辐合带,进而触发高原东部对流系统的生成。同时,高原对流系统降水产生的凝结潜热释放也加强了东移高原低涡的强度,这表明地面加热与高原低涡和对流系统之间存在一种正反馈机制。数值试验结果进一步表明,除了适当的背景环流外,高原地面潜热通量能够增强中低层大气的不稳定性,为对流系统的发生发展积累能量,造成有利于对流降水的热力环境。
- 地面加热 /
- 高原低涡 /
- 高原对流系统 /
- 数值模拟
Abstract: Using the National Centers for Environmental Prediction Final Analyses (NCEP-FNL) reanalysis data, the temperature of black body (TBB) data from the Fengyun-2E (FY-2E) satellite, and the Climate Prediction Center morphing technique (CMORPH) precipitation data, the effects of surface heating on the genesis and development of a convective system over the Tibetan Plateau (TP) in late June 2012 are analyzed on the basis of thermodynamic and dynamic diagnosis and numerical simulation by employing the WRF model. Results indicate that surface heating over the western and central Tibetan Plateau plays an important role in the genesis, enhancement, and eastward propagation of the TP Vortex (TPV). During the development phase, the TPV triggers the genesis of a convective system over the eastern TP by strengthening the convergence belt between the northerly and southerly flows. Meanwhile, strong condensation heating, released by the convective precipitation, reinforces the TPV. Therefore, a positive feedback mechanism exists between the surface heating, the TPV, and the convective system. Results from numerical simulations further reveal that, in addition to the appropriate background circulation, the surface latent heat flux over the eastern TP can induce an unstable state in the low level atmosphere. This provides energy for the development of convective systems, which can then generate a suitable thermal environment for organized convective precipitation.
- The surface heating /
- Tibetan Plateau vortex /
- Convective system /
- Numerical simulation

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