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A New Algorithm of Rain Type Classification for GPM Dual-Frequency Precipitation Radar in Summer Tibetan Plateau

ADVANCES IN ATMOSPHERIC SCIENCES 2024年第11期41卷 2093-2111页

作者： Fu, Yunfei Yang, Liu Wu, Zhenhao Zhang, Peng gu, songyan Chen, Lin Nan, Sun Univ Sci & Technol China Sch Earth & Space Sci CMA USTC Lab Fengyun Remote Sensing Hefei 230026 Peoples R China China Meteorol Adm Inst Heavy Rain Hubei Key Lab Heavy Rain Monitoring & Warning Res Wuhan 430205 Peoples R China China Meteorol Adm Natl Satellite Meteorol Ctr Beijing 100081 Peoples R China

In this study, a new rain type classification algorithm for the Dual-Frequency Precipitation Radar (DPR) suitable over the Tibetan Plateau (TP) was proposed by analyzing Global Precipitation Measurement (GPM) DPR Level-2 data in summer from 2014 to 2020. It was found that the DPR rain type classification algorithm (simply called DPR algorithm) has mis-identification problems in two aspects in summer TP. In the new algorithm of rain type classification in summer TP, four rain types are classified by using new thresholds, such as the maximum reflectivity factor, the difference between the maximum reflectivity factor and the background maximum reflectivity factor, and the echo top height. In the threshold of the maximum reflectivity factors, 30 dBZ and 18 dBZ are both thresholds to separate strong convective precipitation, weak convective precipitation and weak precipitation. The results illustrate obvious differences of radar reflectivity factor and vertical velocity among the three rain types in summer TP, such as the reflectivity factor of most strong convective precipitation distributes from 15 dBZ to near 35 dBZ from 4 km to 13 km, and increases almost linearly with the decrease in height. For most weak convective precipitation, the reflectivity factor distributes from 15dBZ to 28 dBZ with the height from 4 km to 9 km. For weak precipitation, the reflectivity factor mainly distributes in range of 15-25 dBZ with height within 4-10 km. It is also shows that weak precipitation is the dominant rain type in summer TP, accounting for 40%-80%, followed by weak convective precipitation (25%-40%), and strong convective precipitation has the least proportion (less than 30%).

关键词： satellite precipitation radar rain type classification method Tibetan Plateau strong convective precipitation TRMM PR EAST-ASIA REANALYSIS SATELLITE CYCLE

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A New Algorithm of Rain Type Classification for GPM Dual-Frequency Precipitation Radar in Summer Tibetan Plateau

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Advances in Atmospheric Sciences 2024年第11期 2093-2111页

作者： Yunfei FU Liu YANG Zhenhao WU Peng ZHANG songyan gu Lin CHEN Sun NAN School of Earth and Space Sciences CMA–USTC Laboratory of Fengyun Remote SensingUniversity of Science and Technology of China Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research Institute of Heavy RainChina Meteorological Administration National Satellite Meteorological Center China Meteorological Administration

In this study, a new rain type classification algorithm for the Dual-Frequency Precipitation Radar(DPR) suitable over the Tibetan Plateau(TP) was proposed by analyzing Global Precipitation Measurement(GPM) DPR Level-2 data in summer from 2014 to 2020. It was found that the DPR rain type classification algorithm(simply called DPR algorithm) has mis-identification problems in two aspects in summer TP. In the new algorithm of rain type classification in summer TP,four rain types are classified by using new thresholds, such as the maximum reflectivity factor, the difference between the maximum reflectivity factor and the background maximum reflectivity factor, and the echo top height. In the threshold of the maximum reflectivity factors, 30 d BZ and 18 d BZ are both thresholds to separate strong convective precipitation, weak convective precipitation and weak precipitation. The results illustrate obvious differences of radar reflectivity factor and vertical velocity among the three rain types in summer TP, such as the reflectivity factor of most strong convective precipitation distributes from 15 d BZ to near 35 d BZ from 4 km to 13 km, and increases almost linearly with the decrease in height. For most weak convective precipitation, the reflectivity factor distributes from 15 d BZ to 28 d BZ with the height from 4 km to 9 km. For weak precipitation, the reflectivity factor mainly distributes in range of 15–25 d BZ with height within 4–10 km. It is also shows that weak precipitation is the dominant rain type in summer TP, accounting for 40%–80%,followed by weak convective precipitation(25%–40%), and strong convective precipitation has the least proportion(less than 30%).

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风云三号微波温度计长序列再定标历史数据集质量评估

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大气科学学报 2024年第4期47卷 669-680页

作者：曹皓东张鹏廖蜜谷松岩安大伟郭杨中国气象科学研究院北京100081 国家卫星气象中心/国家空间天气监测预警中心北京100081 许健民气象卫星创新中心北京100081 中国气象局中国遥感卫星辐射测量和定标重点开放实验室北京100081

以METOP-A、Suomi-NPP历史资料作为参照,系统分析比较了2008—2020年4颗风云三号卫星的微波温度计(Microwave Temperature Sounder, MWTS)再定标历史资料质量。结果表明,4颗卫星的MWTS探测性能稳步上升,再定标数据集有效消除了遥感仪器... 详细信息

以METOP-A、Suomi-NPP历史资料作为参照,系统分析比较了2008—2020年4颗风云三号卫星的微波温度计(Microwave Temperature Sounder, MWTS)再定标历史资料质量。结果表明,4颗卫星的MWTS探测性能稳步上升,再定标数据集有效消除了遥感仪器在轨期间数据异常跳变、寿命期内遥感仪器辐射响应衰变、不同卫星间的辐射定标差异等因素影响,大幅提升了MWTS历史数据集的准确性和均匀性,使得再定标后的对流层和平流层通道数据与国外同类型仪器数据偏差在±0.1 K范围内。本文还重点分析比较了对流层中高层和平流层低层两个探测通道,结果表明FY-3D MWTS再定标数据和美国NOAA卫星应用研究中心STAR长序列数据集针对中高层大气的表现类似,平均亮温在时间变化和空间分布具有相似的特征,月均全球高空亮温年变化趋势差异最大为0.002 4。因此,2020年之后的FY-3D再定标数据,可以接续STAR长序列数据集,用于中高层大气的温度变化检测与分析。

关键词：风云卫星微波温度计长序列历史资料再定标数据质量评估

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星载雷达降水反演算法敏感性分析

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气象学报 2024年第2期82卷 236-246页

作者：吴琼尹红刚陈林商建谷松岩卢乃锰许健民气象卫星创新中心中国气象局中国遥感卫星辐射测量和定标重点开放实验室/国家卫星气象中心(国家空间天气监测预警中心)北京100081

以全球降水测量卫星(GPM)Ku PR的实测资料作为代理数据,评估了风云三号G星降水测量雷达(FY-3G PMR)原型算法的精度。在此基础上,对降水率和质量加权平均直径(R-D_(m))初始关系、降水相态以及不均匀波束充塞效应(NUBF)订正因子(param NU... 详细信息

以全球降水测量卫星(GPM)Ku PR的实测资料作为代理数据,评估了风云三号G星降水测量雷达(FY-3G PMR)原型算法的精度。在此基础上,对降水率和质量加权平均直径(R-D_(m))初始关系、降水相态以及不均匀波束充塞效应(NUBF)订正因子(param NUBF)进行了降水反演的敏感性分析。首先对调层云和对流云的R-D_(m)初始关系,比较初值调整前后滴谱廓线、雷达反射率因子廓线及降水率廓线的变化;其次设计敏感性试验,分析相态的误判对降水反演精度的影响;最后通过设置不同的param NUBF,评估param NUBF对降水反演的敏感性。结果表明,FY-3G PMR原型算法反演的降水结构及强弱分布和GPM Ku PR具有很好的一致性,反演的相对误差小于10%,相关系数大于0.95。敏感性分析显示雷达反射率因子廓线和降水率廓线的反演对R-D_(m)初始关系不敏感,但滴谱廓线的反演对R-D_(m)初始关系比较敏感。0℃亮带层相态误判尤其是混合相态和固态以及混合相态和液态的误判,影响0℃层附近的空中降水反演,但对地面降水反演影响不大。param NUBF作为高敏感性因子,与真值的差异越大降水率廓线反演的误差越大。开展星载雷达降水反演算法的敏感性分析不仅可以加深对降水反演理论和算法的认识,提高降水反演精度,还可以为FY-3G PMR即将开展的外场试验提供设计思路。

关键词： GPM FY-3G PMR 降水反演相态 NUBF 敏感性分析

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FY-3G降水测量雷达海洋定标精度检验与评估

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应用气象学报 2024年第5期35卷 526-537页

作者：袁梅尹红刚商建江柏森杨润峰谷松岩张鹏国家卫星气象中心(国家空间天气监测预警中心) 北京100081 许健民气象卫星创新中心北京100081 中国气象局遥感卫星辐射测量和定标重点开放实验室北京100081 北京遥测技术研究所北京100076 中国气象局气象探测中心北京100081

2023年4月发射的风云三号气象卫星G星(FY-3G)是我国首颗专用降水测量卫星,双频降水测量雷达(precipitation measurement radar,PMR)是该颗卫星上最核心的仪器。基于2023年7月数据,利用海洋定标理论模型,模拟海洋表面后向散射截面,与观... 详细信息

2023年4月发射的风云三号气象卫星G星(FY-3G)是我国首颗专用降水测量卫星,双频降水测量雷达(precipitation measurement radar,PMR)是该颗卫星上最核心的仪器。基于2023年7月数据,利用海洋定标理论模型,模拟海洋表面后向散射截面,与观测海洋表面后向散射截面进行比对,实现对PMR定标精度的初步评估。通过与国外星载双频降水测量雷达(global precipitation measurement,dual-frequency precipitation radar,GPM DPR)海洋定标检验结果比对,评估FY-3G PMR定标的准确性。海洋定标精度检验结果表明:FY-3G PMR Ku波段在入射角小于15°时观测值与模型模拟值的偏差较小,此时FY-3G PMR的偏差为1.65~2.73 dB,偏差标准差为0.74~1.82 dB。FY-3G PMR Ka波段在18°入射角时偏差小于0.27 dB,偏差的标准差为3.49 dB。FY-3G PMR与GPM DPR的定标偏差存在较为固定的偏差,差异主要源自于数据本身的后向散射统计特性,各入射角下FY-3G PMR Ku与Ka波段海洋表面后向散射数据稳定性与GPM DPR相当。

关键词：降水测量雷达 FY-3G 后向散射截面海洋定标精度检验

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Reprocessing 12-yr Microwave Humidity Sounder Historical Data of Fengyun-3 Satellites

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Journal of Meteorological Research 2022年第2期36卷 261-270页

作者： Yang guO Fangli DOU Qiong WU Jieying HE Shengwei ZHANG Zhenzhan WANG songyan gu Peng ZHANG Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites National Satellite Meteorological Center(National Center for Space Weather)China Meteorological AdministrationBeijing 100081 Innovation Center for Fengyun Meteorological Satellite(FYSIC) China Meteorological AdministrationBeijing 100081 National Space Science Center Chinese Academy of SciencesBeijing 100190

Atmospheric water vapor is an essential climate variable(ECV)with extensive spatial and temporal *** humidity observations from meteorological satellites provide important information for climate system variables,including atmospheric water vapor and precipitable water,and assimilation in numerical weather prediction(NWP)and *** one of the payloads onboard China’s second-generation polar-orbiting operational meteorological Fengyun-3(FY-3)satellites,the Microwave Humidity Sounder(MWHS)has been continuously observing the global humidity since *** reprocessing of historical FY-3 MWHS data is documented in detail in this *** calibrating and correcting the data,the quality of the reprocessed dataset is evaluated and the improvement is shown in this *** results suggest that MWHS observations bias is reduced to approximately 0.8 K,compared with METOP-A Microwave Humidity Sounder(MHS).The temporal variability of MWHS is highly correlated with the instrument *** reprocessing,the scene temperature dependency is mitigated for all 183 GHz channels,and the consistency and stability between FY-3A/B/C are also improved.

关键词： Fengyun-3 Microwave Humidity Sounder historical data reprocessing

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The TanSat mission： preliminary global observations

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Science Bulletin 2018年第18期63卷 1200-1207页

作者： Yi Liu Jing Wang Lu Yao Xi Chen Zhaonan Cai Dongxu Yang Zengshan Yin songyan gu Longfei Tian Naimeng Lu Daren Lyu Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029 China University of Chinese Academy of Sciences Beijing 100049 China Shanghai Engineering Center for Microsatellites Shanghai 201210 China National Satellite Meteorological Center China Meteorological Administration Beijing 100081 China

The Chinese global carbon dioxide monitoring satellite （TanSat） was launched successfully in December 2016 and has completed its on-orbit tests and calibration. TanSat aims to measure the atmospheric column-averaged dry air mole fractions of carbon dioxide （XCO2） with a precision of 4 ppm at the regional scale, and in addition, to derive global and regional CO2 fluxes. Progress towards these objectives is reviewed and the first scientific results from TanSat measurements are presented. TanSat on-orbit tests indicate that the Atmospheric Carbon dioxide GratingSpectrometer is in normal working status and is beginning to produce LIB products. The preliminary TanSat XCO2 products have been retrieved by an algorithm and compared to NASA Orbiting Carbon Observatory-2 （OCO-2） measurements during an over- lapping observation period. Furthermore, the XCO2 retrievals have been validated against eight groundsite measurement datasets from the Total Carbon Column Observing Network, for which the preliminary conclusion is that TanSat has met the precision design requirement, with an average bias of 2.11 ppm. The first scientific observations are presented, namely, the seasonal distributions of XCO2 over land on a global scale.

关键词： TanSat Carbon dioxide Retrieval algorithm Carbon flux inversion

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Latest Progress of the Chinese Meteorological Satellite Program and Core Data Processing Technologies

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Advances in Atmospheric Sciences 2019年第9期36卷 1027-1045页

作者： Peng ZHANG Qifeng LU Xiuqing HU songyan gu Lei YANG Min MIN Lin CHEN Na XU Ling Sun Wenguang BAI Gang MA Di XIAN Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites National Satellite Meteorological CenterChina Meteorological Administration

In this paper,the latest progress,major achievements and future plans of Chinese meteorological satellites and the core data processing techniques are ***,the latest three FengYun(FY)meteorological satellites(FY-2H,FY-3D,and FY-4A)and their primary objectives are introduced Second,the core image navigation techniques and accuracies of the FY meteorological satellites are elaborated,including the latest geostationary(FY-2/4)and polar-orbit(FY-3)***,the radiometric calibration techniques and accuracies of reflective solar bands,thermal infrared bands,and passive microwave bands for FY meteorological satellites are *** also illustrates the latest progress of real-time calibration with the onboard calibration system and validation with different methods,including the vicarious China radiance calibration site calibration,pseudo invariant calibration site calibration,deep convective clouds calibration,and lunar ***,recent progress of meteorological satellite data assimilation applications and quantitative science produce are summarized at *** main progress is in meteorological satellite data assimilation by using microwave and hyper-spectral infrared sensors in global and regional numerical weather prediction ***,the latest progress in radiative transfer,absorption and scattering calculations for satellite remote sensing is summarized,and some important research using a new radiative transfer model are illustrated.

关键词： meteorological satellite geolocation calibration and validation satellite data assimilation radiative transfer model

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气象卫星发展回顾与展望

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遥感学报 2016年第5期20卷 832-841页

作者：卢乃锰谷松岩国家卫星气象中心北京100081

回顾了国际气象卫星和中国风云气象卫星的发展,综述了气象卫星在图像解译、定量产品应用和数据同化方面的成就以及辐射校正技术的进步。围绕大气科学,特别是数值天气预报对天基观测的需求,展望了未来气象卫星的技术发展方向。

关键词：气象卫星遥感应用极地轨道气象卫星静止轨道气象卫星

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Wide-field aurora imager onboard Fengyun satellite:Data products and validation

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Earth and Planetary Physics 2021年第1期5卷 73-78页

作者： guangXing Ding JiaWei Li XiaoXin Zhang Fei He LingPing He KeFei Song Liang Sun Shuang Dai ShiJie Liu Bo Chen Chao Yu XiuQing Hu songyan gu ZhongDong Yang Peng Zhang Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Key Laboratory of Space Weather National Center for Space WeatherChina Meteorological AdministrationBeijing 100081China Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Institutions of Earth Science Chinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Applied Optics Chinese Academy of SciencesChangchun 130033China

New observations of auroras based on the wide-field aurora imager(WAI)onboard Fengyun-3D(FY-3D)satellite are exhibited in this *** of the WAI data is analyzed by comparing auroral boundaries derived from WAI observations with results obtained from data collected by the Special Sensor Ultraviolet Spectrographic Imager(SSUSI)aboard the Defense Meteorological Satellite Program(DMSP F18).Dynamic variations of the aurora with the solar wind,interplanetary magnetic field(IMF)parameters,and the SYM-H index are also *** comparison of auroral boundaries indicates that the WAI data are morphologically valid and suitable to the study of auroral *** responses to solar wind parameters indicate that the WAI data can be useful to monitor and predict the Earth’s space *** the configuration of aurora is a good indicator of the solar wind–magnetosphere–ionosphere(SW-M-I)coupling system,and can reflect the disturbance of the space environment,the WAI will provide important data to help us to study the physical processes in space.

关键词： WAI FY-3D auroral dynamics SSUSI SW-M-I

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