基于COSMIC资料的大气波导时空分布特征  

Spatial and temporal distributions of ducting characteristics derived from COSMIC radio occultation data

作　　者：廖麒翔 石汉青[1] 赵小峰[1] 项杰[1] 俞宏[1] 

机构地区：[1]解放军理工大学气象海洋学院,江苏南京211101

出　　处：《解放军理工大学学报（自然科学版）》2016年第2期156-164,共9页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(41405025;41275209)

摘　　要：为了掌握大气波导的发生规律,利用2007年7月至2012年9月的气象、电离层与气候卫星观测系统星座(COSMIC)掩星折射率数据,对海上悬空波导的发生概率、高度、强度和梯度的全球时空特征进行统计与分析。结果表明,波导事件基本发生在海陆交界地区,非洲西岸的波导事件随着赤道辐合带的移动表现季节性变化;波导高度随着海岸距离的增加而增加,高概率发生区域的波导高度相对较高;波导强度季节和时次变化特征显著,强度值集中在10以下;波导梯度值普遍超过-60/km,阿拉伯海地区在春季受携带沙尘的季风影响,出现-120/km的最小梯度值。因此,COSMIC掩星折射率数据能较好地反映海上悬空波导的时空分布特征。In order to master the ducting occurrence,using the constellation observing system of meteorology lonosphere and climate（COSMIC）radio occultation data collected from July 2007 to September 2012,investigation was made of the statistical results of the spatial and temporal distributions of the elevated ducting characteristics over the marine for the first time,including the duct occurrence probability,the duct height,the duct strength and the duct gradient.The results are summarized as follows：Firstly,the ducting mainly occurs in the land-sea region,and in the west coast of Africa seasonal changes occur with the moving of the Intertropical Convergence Zone（ITCZ）;Secondly,with the increase of the distance from the seacoast,the ducting height increases as well,and the area which has high occurring probability has higher ducting events;Thirdly,the global ducting strength shows significant spatial and temporal variations,and the strength values are generally limited within 10;and Fourthly,the ducting gradient is generally greater than-60/km,and the ducting events are affected by the monsoon which carries dust over the Arabian sea area in the spring,showing a minimum gradient value（-120/km）.The COSMIC radio occultation data can reflect the distributing characteristics of the ducting perfectly.

关 键 词：气象、电离层与气候卫星观测系统星座 悬空波导 时空分布 

分 类 号：P412.27[天文地球—大气科学及气象学]