不同地形条件下台风对电离层TEC的影响  

Effects of Typhoon on Ionospheric TEC under Different Terrain Conditions

作　　者：齐小嫚 柯福阳 QI Xiaoman;KE Fuyang(School of Geographical Sciences,Nanjing University of Information Science&Technology,Nanjing 210044,China;School of Remote Sensing&Geomatics Engineering,Nanjing University of Information Science&Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学地理科学学院,江苏南京210044 [2]南京信息工程大学遥感与测绘工程学院,江苏南京210044

出　　处：《测绘科学技术学报》2019年第4期353-358,363,共7页Journal of Geomatics Science and Technology

基　　金：国家自然科学基金项目(41674036)

摘　　要：利用二阶算子处理的GPS-TEC(Total Electron Content)序列和TEC变化率的标准偏差ROTI(Rate of Total Electron Content Index),并结合GIM(Global Ionosphere Map)数据和IRI-Plas 2017(International Reference Ionosphere and Plasmasphere model)模型的电离层TEC,综合分析了台风麦德姆和山竹分别登陆台湾省和广东省时对其登陆区域电离层TEC的影响。研究表明,麦德姆登陆台湾时,台湾上空有明显的电离层TEC负扰动,其值为3~5 TECU;而山竹登陆广东省时电离层TEC无明显扰动。强对流天气和剧烈起伏的地形能够为声重力波的发展提供有利条件。麦德姆登陆台湾时,由于中央山脉的阻力作用,大气中的陡直递减率为声重力波的发展创造了理想的条件。受起伏地形的影响,声重力波可以传播到电离层高度,干扰电离层电子密度。In this paper,GPS-TEC(Total Electron Content)sequences processed by a second-order operator and ROTI(Rate of Total Electron Content Index)are used,and combined with GIM(Global Ionosphere Map)data and the ionospheric TEC of IRI-Plas 2017(International Reference Ionosphere and Plasmasphere model)model,the effects of typhoons MATMO and MANGKHUT on the ionospheric TEC of their landing areas in Taiwan Province and Guangdong Province are comprehensively analyzed.The results show that there is a significant negative ionospheric TEC disturbance over Taiwan with a value of 3~5 TECU when MATMO landed in Taiwan Province,while no obvious ionospheric TEC disturbances are detected when MANGKHUT landed in Guangdong Province.Severe convective weather and the dramatic undulating terrain can provide favorable conditions for the development of acoustic gravity waves.When MATMO landed in Taiwan,the steep lapse rate in the atmosphere creates ideal conditions for the development of acoustic gravity waves due to the resistance of Central Mountains.Affected by the dramatic undulating terrain,acoustic gravity waves can propagate to the ionosphere altitude and disturb the ionosphere electron density.

关 键 词：台风 电离层扰动 电子浓度总含量 声重力波 地形 

分 类 号：P228[天文地球—大地测量学与测量工程]