针对搭载于风云三号C星（FY-3C）上的微波湿温探测仪（Microwave Humidity and Temperature Sounder,MWHTS）,建立了海洋晴空大气条件下温湿廓线同时反演的一维变分反演系统.通过对影响反演精度的各个因素进行分析,确立了该系统的输入参...针对搭载于风云三号C星（FY-3C）上的微波湿温探测仪（Microwave Humidity and Temperature Sounder,MWHTS）,建立了海洋晴空大气条件下温湿廓线同时反演的一维变分反演系统.通过对影响反演精度的各个因素进行分析,确立了该系统的输入参数.对于FY-3C/MWHTS观测亮温与快速辐射传输（Radiative Transfer Model for TOVS,RTTOV）模型的模拟亮温之间的偏差和角度依赖性,采用逐像元统计回归校正方法进行校正.选择西北太平洋海域晴空条件下的校正亮温数据进行温湿廓线的反演,并利用欧洲中期天气预报中心再分析数据集对反演结果进行验证,结果表明：反演的温度廓线和相对湿度廓线的最大平均偏差分别为1.09K和5.4%,最大均方根误差分别为1.48K和22.69%,与未校正亮温的反演结果相比,温度廓线的均方根误差最大可减小1.56K,湿度廓线的均方根误差最大可减小14.71%.反演温湿廓线与背景廓线的精度对比表明：反演的温度廓线在10~70hPa、300~350hPa和700~850hPa内的精度高于背景廓线的精度,而反演湿度廓线的精度除了825~875hPa,其他范围均高于背景廓线的精度,因此FY-3C/MWHTS观测亮温的反演结果可进一步提高预报廓线精度.展开更多
由中国风云三号C星(FY-3C)搭载的微波温湿探测仪(MWHTS)的亮温观测资料能够实时反演得到高分辨率、高精度的海面气压场。基于三维变分同化方法将FY-3C/MWHTS观测资料反演的海面气压场同化进入中尺度天气研究与预报(Weather Research and...由中国风云三号C星(FY-3C)搭载的微波温湿探测仪(MWHTS)的亮温观测资料能够实时反演得到高分辨率、高精度的海面气压场。基于三维变分同化方法将FY-3C/MWHTS观测资料反演的海面气压场同化进入中尺度天气研究与预报(Weather Research and Forecasting,WRF)模式,以台风“Maria”和“Noru”为例,通过控制实验和同化试验的对比分析,探讨了同化反演的海面气压场对台风数值预报的影响。初始化敏感性试验结果表明,同化海面气压场使初始时刻台风中心气压与位置更接近实况,并且调整了台风初始温度场和风场的结构和分布。台风的数值预报结果表明:同化反演的海面气压场能够改进台风的路径和强度预报精度。展开更多
The Microwave Humidity and Temperature Sounder(MWHTS)is the main payload of FengYun 3D(FY-3D),designed for atmospheric humidity and temperature sounding,and also for monitoring severe weather systems such as typhoons ...The Microwave Humidity and Temperature Sounder(MWHTS)is the main payload of FengYun 3D(FY-3D),designed for atmospheric humidity and temperature sounding,and also for monitoring severe weather systems such as typhoons and rainstorms which will be launched in 2016.Before the launch of MWHTS,a series of experiments will be conducted in normal environment and a thermal/vacuum(T/V)chamber to determine radiometric characteristics of each channel,which are of very importance before the launch.In this paper,design and component description,as well as technical specifications and test results for RF and IF,will be provided.Then T/V calibration results,such as bandwidth correction,nonlinear error,calibration accuracy and sensitivity for all channels.展开更多
The paper develops a passive sub-millimeter precipitation retrievals algorithm for Microwave Humidity and Temperature Sounder(MWHTS)onboard the Chinese Feng Yun 3C(FY-3C)satellite.The retrieval algorithm employs a num...The paper develops a passive sub-millimeter precipitation retrievals algorithm for Microwave Humidity and Temperature Sounder(MWHTS)onboard the Chinese Feng Yun 3C(FY-3C)satellite.The retrieval algorithm employs a number of neural network estimators trained and evaluated using the validated global reference physical model NCEP/WRF/ARTS,and works for seawater.NCEP data per 6 hours are downloaded to run the Weather Research and Forecast model WRF,and derive the typical precipitation data from the whole world.The Atmospheric Radiative Transfer Simulator ARTS is feasible for performing simulations of atmospheric radiative transfer.Rain detection algorithm has been used to generate level 2 products.Retrievals are reliable for surface precipitation rate higher than 0.1 mm/h at 15km resolution,which is in good agreement with those retrieved using the Precipitation retrieval algorithm version 1(ATMP-1)for Advanced Technology Microwave Sounder(ATMS)aboard Suomi NPP satellite.展开更多
根据IGRA2无线电探空数据和气象、电离层和气候卫星联合观测系统(Constellation Observing System for Meteorology Ionosphere and Climate,COSMIC)掩星资料,对2015—2017年包含折射率、温度和比湿廓线在内的FY-3C掩星中性大气产品进...根据IGRA2无线电探空数据和气象、电离层和气候卫星联合观测系统(Constellation Observing System for Meteorology Ionosphere and Climate,COSMIC)掩星资料,对2015—2017年包含折射率、温度和比湿廓线在内的FY-3C掩星中性大气产品进行质量分析。结果表明:FY-3C掩星折射率廓线25 km以下整体无系统偏差,相对偏差标准差≤5%;温度廓线存在系统负偏差,标准差≥1.5 K;比湿廓线越趋地表质量越低,5 km下标准差≤1.2 g/kg。总体而言,FY-3C掩星数据质量较好,在2015—2017年间逐年提高,但在近地面和25km以上有待进一步提高。对2017年产品的进一步分析表明:就季节而言,折射率廓线和温度廓线质量均在冬季最差,比湿廓线质量在夏季最差;就纬度带而言,折射率廓线在低纬度带质量最差,温度廓线质量的分纬度带比较结果在不同高度范围存在差异,比湿廓线在低纬度带质量明显低于中高纬度带;此外,FY-3C掩星大气产品数据质量随昼夜和海陆变化也存在一定差异。展开更多
文摘针对搭载于风云三号C星（FY-3C）上的微波湿温探测仪（Microwave Humidity and Temperature Sounder,MWHTS）,建立了海洋晴空大气条件下温湿廓线同时反演的一维变分反演系统.通过对影响反演精度的各个因素进行分析,确立了该系统的输入参数.对于FY-3C/MWHTS观测亮温与快速辐射传输（Radiative Transfer Model for TOVS,RTTOV）模型的模拟亮温之间的偏差和角度依赖性,采用逐像元统计回归校正方法进行校正.选择西北太平洋海域晴空条件下的校正亮温数据进行温湿廓线的反演,并利用欧洲中期天气预报中心再分析数据集对反演结果进行验证,结果表明：反演的温度廓线和相对湿度廓线的最大平均偏差分别为1.09K和5.4%,最大均方根误差分别为1.48K和22.69%,与未校正亮温的反演结果相比,温度廓线的均方根误差最大可减小1.56K,湿度廓线的均方根误差最大可减小14.71%.反演温湿廓线与背景廓线的精度对比表明：反演的温度廓线在10~70hPa、300~350hPa和700~850hPa内的精度高于背景廓线的精度,而反演湿度廓线的精度除了825~875hPa,其他范围均高于背景廓线的精度,因此FY-3C/MWHTS观测亮温的反演结果可进一步提高预报廓线精度.
文摘由中国风云三号C星(FY-3C)搭载的微波温湿探测仪(MWHTS)的亮温观测资料能够实时反演得到高分辨率、高精度的海面气压场。基于三维变分同化方法将FY-3C/MWHTS观测资料反演的海面气压场同化进入中尺度天气研究与预报(Weather Research and Forecasting,WRF)模式,以台风“Maria”和“Noru”为例,通过控制实验和同化试验的对比分析,探讨了同化反演的海面气压场对台风数值预报的影响。初始化敏感性试验结果表明,同化海面气压场使初始时刻台风中心气压与位置更接近实况,并且调整了台风初始温度场和风场的结构和分布。台风的数值预报结果表明:同化反演的海面气压场能够改进台风的路径和强度预报精度。
文摘The Microwave Humidity and Temperature Sounder(MWHTS)is the main payload of FengYun 3D(FY-3D),designed for atmospheric humidity and temperature sounding,and also for monitoring severe weather systems such as typhoons and rainstorms which will be launched in 2016.Before the launch of MWHTS,a series of experiments will be conducted in normal environment and a thermal/vacuum(T/V)chamber to determine radiometric characteristics of each channel,which are of very importance before the launch.In this paper,design and component description,as well as technical specifications and test results for RF and IF,will be provided.Then T/V calibration results,such as bandwidth correction,nonlinear error,calibration accuracy and sensitivity for all channels.
文摘The paper develops a passive sub-millimeter precipitation retrievals algorithm for Microwave Humidity and Temperature Sounder(MWHTS)onboard the Chinese Feng Yun 3C(FY-3C)satellite.The retrieval algorithm employs a number of neural network estimators trained and evaluated using the validated global reference physical model NCEP/WRF/ARTS,and works for seawater.NCEP data per 6 hours are downloaded to run the Weather Research and Forecast model WRF,and derive the typical precipitation data from the whole world.The Atmospheric Radiative Transfer Simulator ARTS is feasible for performing simulations of atmospheric radiative transfer.Rain detection algorithm has been used to generate level 2 products.Retrievals are reliable for surface precipitation rate higher than 0.1 mm/h at 15km resolution,which is in good agreement with those retrieved using the Precipitation retrieval algorithm version 1(ATMP-1)for Advanced Technology Microwave Sounder(ATMS)aboard Suomi NPP satellite.
文摘根据IGRA2无线电探空数据和气象、电离层和气候卫星联合观测系统(Constellation Observing System for Meteorology Ionosphere and Climate,COSMIC)掩星资料,对2015—2017年包含折射率、温度和比湿廓线在内的FY-3C掩星中性大气产品进行质量分析。结果表明:FY-3C掩星折射率廓线25 km以下整体无系统偏差,相对偏差标准差≤5%;温度廓线存在系统负偏差,标准差≥1.5 K;比湿廓线越趋地表质量越低,5 km下标准差≤1.2 g/kg。总体而言,FY-3C掩星数据质量较好,在2015—2017年间逐年提高,但在近地面和25km以上有待进一步提高。对2017年产品的进一步分析表明:就季节而言,折射率廓线和温度廓线质量均在冬季最差,比湿廓线质量在夏季最差;就纬度带而言,折射率廓线在低纬度带质量最差,温度廓线质量的分纬度带比较结果在不同高度范围存在差异,比湿廓线在低纬度带质量明显低于中高纬度带;此外,FY-3C掩星大气产品数据质量随昼夜和海陆变化也存在一定差异。
