李丹^1,,
卞建春^1,2,,
1. 中国科学院大气物理研究所中层大气和全球环境探测重点实验室, 北京 100029
2. 中国科学院大学地球科学学院, 北京 100049

基金项目: 国家自然科学基金项目（41605025，91337214，41675040）和中国博士后科学基金项目（2015M581153）共同资助


详细信息

作者简介: 李丹, 女, 研究方向为东北冷涡引起的平流层-对流层输送过程的研究.E-mail:lidan@mail.iap.ac.cn

通讯作者: 卞建春, 男, 博士生导师, 主要从事中层大气过程研究和大气过程可预报性研究.E-mail:bjc@mail.iap.ac.cn

中图分类号: P434

收稿日期:2017-03-22
修回日期:2017-05-18
上线日期:2018-09-05

Case analyses and numerical simulation of transport process caused by convection associated with northeast cold vortex

LI Dan^1,,
BIAN JianChun^1,2,,
1. Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
2. College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China


More Information

Corresponding author: BIAN JianChun,E-mail:bjc@mail.iap.ac.cn

MSC: P434

--> Received Date: 22 March 2017
Revised Date: 18 May 2017
Available Online: 05 September 2018


摘要
摘要:平流层-对流层物质交换是影响全球大气成分收支的重要过程.过去的研究认为大尺度的交换过程在平流层-对流层物质交换中最为重要，但是近些年的研究表明，中小尺度过程对平流层-对流层物质交换也有重要贡献.本文利用OMI和MLS数据、ERA-Interim再分析资料，结合中尺度WRF模式综合分析了东北地区发生在冷涡前部和冷涡后部的两次强对流天气过程.结果表明：发生在冷涡前部暖锋云系中的强对流持续时间长，对流垂直尺度小，下平流层静力稳定度高；发生在冷涡后部的孤立强对流持续时间短，水平尺度较小，且在对流层顶附近，静力稳定度小，对流可穿出热力学对流层顶.从示踪物分布情况来看，两次强对流都可将示踪物输送到对流层顶附近，但是冷涡前部对流可将示踪物从边界层输送到整个对流层，而孤立对流是把示踪物输送到对流层顶，而不与自由对流层空气发生混合.
关键词: 平流层-对流层物质交换/
东北冷涡/
对流输送/
WRF模式

Abstract:The stratosphere-troposphere exchange is a key process due to its effect on the global budget of chemical composition. Previous studies have shown that large-scale process is the most important in the stratosphere-troposphere exchange, but recent studies have shown that meso-and micro-scale processes also have important contributions to the stratosphere-troposphere exchange. The satellite data from MLS (the Aura Microwave Limb Sounder) and OMI (the Ozone Monitoring Instrument) and the ERA-Interim (European centre for medium-range weather forecasts Re-Analysis Interim) reanalysis data, combined with the Weather Research and Forecasting (WRF) model are used to test two convection events occurred on the western and eastern side of the cold vortex over northeastern China. The results show that the convection among the mesoscale cloud systems occurred on the eastern side of the cold vortex, would have a long lifetime, a small vertical scale, with the high static stability in the lower stratosphere. In contrast, the isolated convection occurred on the western side of the cold vortex, would have a short lifetime, a small horizontal scale, with low static stability in the lower stratosphere and overshooting the lapse-rate tropopause. Simulations show that the mesoscale cloud systems can transport the boundary layer tracer to the tropopause layer with mixing between the whole troposphere. In contrast, the isolated convection can directly transport the boundary layer tracer to the tropopause without mixing between the free troposphere.
Key words:Stratosphere-troposphere exchange/
Northeast cold vortex/
Convective transport/
WRF model



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