塔什干低涡天气系统自动识别方法的探讨  

Automatic Recognition Method for Tashkent Vortex Weather Process

作　　者：秦贺[1,2] 张云惠 黄秉光[3] 杨莲梅 

机构地区：[1]新疆气象台,新疆乌鲁木齐830002 [2]兰州大学大气科学学院,甘肃兰州730000 [3]新疆气象服务中心,新疆乌鲁木齐830002

出　　处：《沙漠与绿洲气象》2014年第4期15-17,共3页Desert and Oasis Meteorology

基　　金：中国沙漠气象科学研究基金(Sqj2011007);国家自然基金项目(41075049);国家重点基础研究发展计划(2010CB951001)共同资助

摘　　要：根据塔什干低涡的定义,利用NCEP/NCAR日平均再分析高度场、温度场资料,运用计算机编程自动识别、追踪塔什干低涡的中心位置、中心强度和持续时间,进而获取塔什干低涡天气过程的数据集。此计算机识别程序中有两个关键判断条件:一是某格点i的高度值小于其外围格点高度值,二是低涡范围内任意格点的纬向温度二阶导数大于零。实践证明该方法对塔什干低涡系统的识别准确且省时省力,同时避免了人工挑选的主观性误差。Based on the definition of Tashkent vortex, the longitude, latitude and intensity of center and duration of Tashkent vortex are recognized automatically with computer program from the NCEP/NCAR reanalysis data. Then the dataset of Tashkent vortex weather process are obtained.There are two critical judgment conditions in the computer recognition program. One is that the height of grid is less than its peripheral grid height. The other is that the second derivative of zonal temperature on any grid within vortex is greater than zero. It proves that this computer recognition method is reliable and simple in operation and avoids the subjective error of artificial selection.

关 键 词：自动识别 塔什干低涡 新疆 

分 类 号：P416[天文地球—大气科学及气象学]