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利用FY-3C气象卫星GNSS掩星估计全球重力波变化与分析
投稿时间:2019-07-01    点此下载全文
引用本文:金双根,高超,李君海.利用FY-3C气象卫星GNSS掩星估计全球重力波变化与分析[J].南京信息工程大学学报,2020,12(1):57~67
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作者单位
金双根 南京信息工程大学 遥感与测绘工程学院, 南京, 210044
中国科学院上海天文台, 上海, 200030 
高超 中国科学院上海天文台, 上海, 200030
中国科学院大学, 北京, 100049 
李君海 中国科学院上海天文台, 上海, 200030 
基金项目:国家自然科学基金(11573052);国家自然科学基金委-德国科学基金会合作项目(41761134092);江苏省特聘教授项目(R2018T20);南京信息工程大学人才启动经费(2243141801036)
中文摘要:大气重力波是地球大气层中广泛存在的重要大气动力学扰动,研究其分布和变化规律对理解大气物理、大气结构以及大气动力学等具有重要意义.传统大气重力波探测手段,如雷达和探空气球等,均存在探测时间短、有效探测高度低等缺点,全球卫星导航系统(GNSS)掩星观测具有全天候、低成本、高精度等优点,被广泛应用于地球大气探测和研究,为研究区域或全球重力波变化和活动特征提供了新的观测手段.本文利用中国第一颗搭载GNSS掩星设备气象卫星——风云3C (FY-3C)获得的掩星数据,反演得到2014年8月—2016年12月大气温度轮廓线,并首次估计重力波参数分布,分析了重力波参数的时空变化分布特征.结果表明,海陆季节性对流导致冬夏两季的重力波势能强于春秋两季,赤道对流作用导致赤道区域重力波强于两极,夏季南半球中低纬度地区重力波活动频繁,冬季北半球中低纬度区域重力波活动频繁.重力波随着高度的上升,势能逐渐下降.另外,地形是低层大气重力波的主要来源.
中文关键词:GNSS掩星  大气重力波  FY-3C卫星
 
Estimation and analysis of global gravity wave using GNSS radio occultation data from FY-3C meteorological satellite
Abstract:Atmospheric gravity wave is an important atmospheric dynamic disturbance widely existing in the Earth's atmosphere.It is of great significance to study its distribution and variations for understanding atmospheric physics,atmospheric structure and atmospheric dynamics.Traditional methods of atmospheric gravity wave detection,such as radar and sounding balloon,have the weaknesses of short detection time and low effective detection altitude.The Global Navigation Satellite System (GNSS) Radio Occultation with the advantages of all-weather,low cost and high accuracy has been widely used in the earth's atmosphere detection and research,which provides new observation data for the study of regional or global gravity wave variation and activity characteristics.In this paper,the occultation data of the first Chinese GNSS radio occultation satellite-Fengyu-3C (FY-3C) are used to obtain the atmospheric temperature profile from August 2014 to December 2016,and then the spatial and temporal distribution of gravity wave parameters is estimated and analyzed for the first time.The results show that the potential energy of gravity wave in winter and summer is stronger than that in spring and autumn due to seasonal convection between the land and the sea.Equatorial convection leads to stronger gravity wave in the equatorial region than in the two polar regions.In summer,gravity wave activity is frequent in the middle and low latitudes of the southern hemisphere,and in winter,gravity waves in the middle and low latitudes of the northern hemisphere are active.With the increase of altitude,the potential energy of gravity wave decreases gradually.In addition,the topography is the main source of gravity waves in the lower atmosphere.
keywords:GNSS radio occultation  atmospheric gravity wave  FY-3C satellite
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