基于CFSR资料的青藏高原低涡客观识别技术及应用  

An objective identification of the Tibetan plateau vortex based on climate forecast system reanalysis data

作　　者：张博[1] 李国平[1] 

机构地区：[1]成都信息工程大学大气科学学院,成都610225

出　　处：《兰州大学学报（自然科学版）》2017年第1期106-111,118,共7页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(91337215;41175045;41675057);国家重点基础研究发展计划(973计划)项目(2012CB417202);公益性行业(气象)科研专项项目(GYHY201206042)

摘　　要：根据人工识别青藏高原低涡的基本标准,结合高原气象学和几何学相关知识,确定了高原低涡客观识别的标准,利用气候预报系统再分析资料构建了2001-2010年高原低涡活动客观识别数据集.对识别出的低涡与低涡年鉴及基于NCEP再分析资料的人工识别数据集进行对比,分析夏季低涡的气候学特征.结果表明,低涡客观识别方法在夏季生成频数、月分布等方面与主观识别的统计结果相近;客观识别与基于NCEP资料人工识别数据集的吻合率约为60%,与低涡年鉴的吻合率约为50%.客观识别出的高原低涡在6月出现最多.涡源主要分布于西藏那曲、改则、双湖和申扎一带,其中生成于高原西部、中部和东部的低涡分别占33%、39%和28%.低涡在高原停留12 h的占60%,停留24h的不足10%;低涡的移动方向主要有东北、东、东南,其中向东北移动的低涡最多.Based on artificial identification of the Tibetan plateau vortex（TPV）,the knowledge of plateau meteorology and geometry,the TPV＇s standard of objective identification was defined and implemented by programming.The database of TPV from 2001 to 2010 was built on the basis of the climate forecast system reanalysis data.The results of this objective identification were compared with the TPV yearbook data and the TPVs database with reference to the NCEP/NCAR reanalysis data,and the climatic characteristics of TPV are analyzed.The results showed that the initiating frequency and monthly distribution of TPV based on the objective identification were close to the results of artificial identification.The agreement between TPV based on objective identification and TPVs database based on the NCEP/NCAR reanalysis data was about 60%,while the agreement between TPV based on objective identification and TPV yearbook data was about 50%.Many TPVs occurred in summer,and the maximum frequency of TPV occurred in June.The generating source of the TPV in summer appeared mainly in Naqu,Gaize,Shuanghu,and Shenzha,and the TPVs generated in western,central and eastern areas accounted for 33%,39%）,and 28%respectively.The TPVs on the plateau lasting 12 h accounted for 60%,while those lasting24 h accounted for nearly 10%.The directions of TPV＇s movement were mainly northeast,east,and southeast.The TPVs moving toward the northeast were in the majority.

关 键 词：高原低涡 客观识别 气候预报系统再分析资料 青藏高原 

分 类 号：P443[天文地球—大气科学及气象学]