加密探空资料的对比分析

Comparative Analysis of Encrypted Sounding Data

摘要: 探空观测资料作为资料同化和数值预报中最基本的观测资料，对同化分析和预报有直接影响。自我国L波段雷达–数字探空仪更新换代以来，探空观测系统具备了获取每日4次、垂直分辨为秒级和分钟级的加密探空观测。本文利用2013年6月秒级加密探空观测资料与NCEP FNL资料以及欧洲中心再分析资料进行分析对比，对2013年6月已经运行的L波段探空系统的秒级探空观测数据进行质量评估。结果表明：加密探空资料和NCEP FNL资料在空间演变上，加密探空资料对500 hPa环流场的描述能力较好，其次是700 hPa，但对于我国低纬度地区的高位势区的描述范围上偏大，对于850 hPa的环流场的描述有一定的误差。在时间演变中200 hPa总体结果较一致；而相比于200 hPa，在500 hPa、850 hPa有差异。从变量上来说，加密探空资料对纬向环流和经向环流的描述能力较好，对于位势高度以及相对湿度的描述能力稍差。垂直演变中温度、位势高度和纬向环流的描述能力较好，对于经向环流以及相对湿度的描述能力稍差。

Abstract: Using the infilled sounding data, NCEP FNL data and EC data in June 2013, the tropospheric geopo-tential height field, temperature field, relative humidity field, zonal circulation and meridional circulation field are in space and time. By comparing the condensation degree of vertical distribution simulation, the results show that the encrypted sounding data and the NCEP FNL data have good spatial evolution ability to describe the 500 hPa circulation field. The second is 700 hPa, but the description of the high potential region in the low latitudes of China is larger than that of the current field at 850 hPa. There is a certain error in the description. In time evolution, the overall results of 200 hPa isobaric surface were consistent, but there was a difference between 500 hPa and 850 hPa. In terms of variables, the encrypted sounding data can describe the zonal and meridional circulation better than the potential height and relative humidity. In vertical evolution, the temperature, potential height and zonal circulation are well described, but the description ability of meridional circulation and relative humidity is slightly poor.