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中国东部夏季风雨带向北推进与条件对称不稳定的关系研究
作者:
作者单位:

1.南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心,南京 210044;2.广西壮族自治区气象台,南宁530022;4.中国科学院大气物理研究所云降水物理与强风暴重点实验室,北京100029

作者简介:

黄明策,男,1977年出生,博士研究生,高级工程师,主要从事暴雨预报及机理研究。E-mail: huangmingce_gx@126.com

通讯作者:

沈新勇,E-mail: shenxy@nuist.edu.cn

基金项目:

国家自然科学基金项目 41530427、41790471、41975054,中国科学院战略性先导科技专项XDA20100304,国家重点研发计划项目 2016YFC0203301,江苏省普通高校研究生创新计划项目 CXLX13_478,广西壮族自治区气象局短时临近天气预报技术创新团队


A Study on the Relationship between Conditional Symmetric Instability and Northward Jumping of the Summer MonsoonRainband in East China
Author:
Affiliation:

1.Key Laboratory of Meteorological Disaster, Ministry of Education / Joint International Research Laboratory of Climate and Environment Change / Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044;2.Guangxi Zhuang Autonomous Regional Meteorological Observatory, Nanning 530022;3.Environment Canada, Toronto, Ontario, Canada;4.Key Laboratory of Cloud-Precipitation Physics and Severe Storms, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029

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    摘要:

    利用1981~2010年欧洲中期天气预报中心(ECMWF)ERA-interim再分析资料和中国741站日降水资料,分析了中国东部夏季风雨季期间,条件对称不稳定(CSI)与季风雨带季节性向北推进的关系。结果表明,逐月强降水距平场显示了雨带强降水中心自华南(4~6月)先北跳到江淮(5~7月),再到华北(7~8月)的季节性进程,特别是7~8月强降水距平场具有“北多南少”分布特征,与对应的平均雨量场相比,其表征雨带季节性北跳现象更显著。与雨带强降水中心季节性变化一致,大气负湿位涡通量中心亦先在华南停滞(4~6月)、然后移到江淮(5~7月),最后到达华北(7~8月)。在垂直方向上,CSI区4、5及9月主要在925~600 hPa,而6~8月抬升到700~600 hPa,CSI区也很好地表征了夏季风北进加强、南撤减弱以及所伴随的雨带变化趋势。在春末夏初,夏季风建立初期的华南、江淮雨季集中期,热成风(垂直风切变)作用对倾斜对流有效位能(SCAPE)的贡献占绝对优势,盛夏的华北雨季集中期则相反,浮力作用项(CAPE)占主要作用;同时,热成风作用项的季节分布与强降水中心季节变化一致,但浮力作用项却没有这种变化关系。条件性湿位涡通量指数(CMF index)可指示雨带强降水异常区。

    Abstract:

    The summer monsoon rainband in East China and its northward seasonal leap in relation to conditional symmetric instability (CSI) during the period of 1981 to 2010 is diagnosed through computing and analyzing moist potential vorticity (MPV) flux,CSI, slantwise convective available potential energy (SCAPE), and a newly developed index of conditional MPV flux (CMF). The European Centre for Medium-Range Weather Forecasts reanalysis data and daily precipitation data collected at 741 stations in China are used. Monthly-averaged anomaly fields show the northward leap of heavy rainfall center from South China in April to June to the Yangtze-Huaihe region in May to July and to North China in July to August. The spatial pattern of more precipitation in North China and less precipitation to the South of the Yangtze-Huaihe during July to August is well represented by the rainfall anomaly field than by the mean field. The negative MPV flux is in phase with the northward leap of heavy rainfall from South China (April to June) to North China (July to August). CSI zones within the rainband center are mainly located between 925 and 600 hPa in April, May and September, whereas they vertically shift to 700-600 hPa from June to August. The CSI zones are also a good indicator of the northward leap of summer monsoon rainband and its intensification as well as its southward retreat and weakening. During the late spring and early summer when the monsoon starts, the thermal wind contribution to SCAPE is dominant over the contribution of CAPE in the magnitudes, whereas the opposite is true from July to August. Furthermore, the thermal wind contribution is in phase with the northward seasonal leap of heavy rainfall from South China in April to June to Yangtze-Huaihe in May to July and to North China in July to August, while CAPE has no such relationship with the heavy rainfall center. The CMF index can be an indicator for the regional summer rainfall anomaly in East China.

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黄明策,CAOZuohao,沈新勇.中国东部夏季风雨带向北推进与条件对称不稳定的关系研究.大气科学,2019,43(5):943~958 HUANG Mingce,CAO Zuohao,SHEN Xinyong.A Study on the Relationship between Conditional Symmetric Instability and Northward Jumping of the Summer MonsoonRainband in East China.Chinese Journal of Atmospheric Sciences (in Chinese),2019,43(5):943~958

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  • 收稿日期:2018-01-17
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  • 在线发布日期: 2019-09-23
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