南海海区低空大气波导气候学分析

基于2014—2016年发布的全球电信系统(global telecommunication system,GTS)数据,对南海海域附近8个探空站数据进行了统计分析,获得了南海海区低空大气波导参数统计特征以及概率分布特征结果.结果表明:年度统计来看,南海海区表面波导发生概率在20%左右,大部分表面波导高度位于100 m以下,强度小于10 M,悬空波导发生概率在50%左右,悬空波导顶高、层底高、底高参数一般位于1 000~2 500 m,强度位于4 M^15 M,空间分布基本呈现中部高、南北低(与热带辐合带相关)的特点;月份统计来看,南海北部以及中部具有明显的月份变化(与南海季风密切相关),而南海南部(靠近赤道)月份变化则不明显.统计分析结果可为南海海区雷达、通信系统的运行保障提供参考.

The climatological analysis of the lower atmospheric ducts in South China Sea

Based on the Global Telecommunication System(GTS) data from 2014 to 2016, a statistical analysis from eight radiosonde stations data near South China Sea(SCS)is given in this paper. We obtained the annual duct parameters and probability distribution characteristics of the lower atmospheric ducts. Annual statistics show that the probability of surface duct occurrence in the South China Sea is about 20%, and most surface duct heights are below 100 m and the duct intensity is smaller than 10 M. The probability of elevated duct occurrence is about 50%. The parameters of top height, bottom height and bottom height of elevated duct are generally between 1 000 and 2 500 m, and the intensity is 4 M-15 M. The spatial distribution of atmospheric duct is high in the middle part and low in the north and south part, which is related to the inter tropical convergence zone(ITCZ). Monthly statistics show that there are obvious monthly variations in the northern and central South China Sea, which closely relates to the South China Sea monsoon, while the variations are not obvious in the southern South China Sea area (the area near the equator). These statistical analysis results can serve as a reference for radar and communication system working or operating in this sea area.