doi:  10.3878/j.issn.1006-9895.1704.17209
高原切变线的客观识别与时空分布的统计分析

Objective Identification of Tibetan Plateau Shear Line and Feature Analysis of Evolution in Space and Time
摘要点击 792  全文点击 121  投稿时间:2017-08-05  修订日期:2017-11-21
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基金:  国家自然科学基金(41675057,91337215,41765003)、财政部、科技部公益性行业(气象)科研专项(GYHY201206042)共同资助.The Natural Science Foundation of China(41675057,91337215)、Ministry of finance, science and technology department public welfare industry (meteorological) research projects(GYHY201206042)Sjointly sponsor.
中文关键词:  高原切变线,客观识别,CFSR再分析资料,时空分布,气候特征
英文关键词:  TibetanPlateau  shear line(TPSL), Objective  identification, CFSR  reanalysis data, Spatial  and temporal  distribution, Climatic  characteristics
     
作者中文名作者英文名单位
刘自牧Liu Zimu成都信息工程大学大气科学学院
李国平Li Guoping成都信息工程大学大气科学学院
引用:刘自牧,李国平.2018.高原切变线的客观识别与时空分布的统计分析[J].大气科学
Citation:Liu Zimu,Li Guoping.2018.Objective Identification of Tibetan Plateau Shear Line and Feature Analysis of Evolution in Space and Time[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      为客观、稳定的统计高原切变线,并对高原切变线气候特征进行分析。通过对比三套常用的高分辨率再分析资料(ERA Interim、NCEP CFSR和JRA-55)在高原地区中低层的适用性,筛选出与高原地区500hPa风场较为吻合的NCEP CFSR再分析资料作为基础数据,根据人工判识切变线的基本标准与计算机几何学知识,定义了高原切变线的客观识别标准。对客观识别出的2005-2015年高原切变线与《青藏高原低涡切变线年鉴》中的结果进行对比分析与验证,并在此基础上统计分析了近11年高原切变线的气候特征。高原切变线年均生成49.4条,其中东部型切变线年均38条,是高原切变线的基本型;高原切变线维持时间多为6h;切变线两侧的水平散度、垂直涡度和总变形三个物理量的大值区均出现在94°E~95°E。客观识别高原切变线的方法可以较为高效地识别高原切变线,为高原切变线的研究提供了新的途径。
Abstract:
      In order to objectively and efficiently calculate TibetanPlateau shear line (TPSL), and analyze the climatic characteristics of TPSL. By comparing the applicability of three sets of high resolution reanalysis data in common usein plateau area, selecting the CFSR reanalysis data as the basicdata, according to the basic standard of artificial identification shear line and knowledge of computer geometry, defining objective identification standard of TPSL, comparative analyzing and verifying the objective identification 2005-2015 TPSL with TPSL yearbook, statistical analyzing the TPSL climatic characteristics in recent 11 years on this basis. There are 49.4 TPSLs annual average, there are 38 eastern TPSLs annual average therein, there are fundamental type of TPSL; The maintain time of TPSL is 6h usually, basing on total deformation、vertical vorticity、horizontal divergence to analyze the strength of the meteorological elements of TPSL , it indicates that the great value area of the meteorological elements strength appears in 94°E~95°E. The objective identification TPSL method can identify TPSL efficiently and quantificationally, it provides a new way to research the TPSL.
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