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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： 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 ChinaHefei 230026China Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research Institute of Heavy RainChina Meteorological AdministrationWuhan 430205China National Satellite Meteorological Center China Meteorological AdministrationBeijing 100081China

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%).

关键词： satellite precipitation radar rain type classification method Tibetan Plateau strong convective precipitation

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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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TanSat Mission Achievements： from Scientific Driving to Preliminary Observations

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空间科学学报 2018年第5期38卷 627-639页

作者： LIU Yi WANG Jing YAO Lu CHEN Xi CAI Zhaonan YANG Dongxu YIN Zengshan gu songyan TIAN Longfei LU Naimeng L Daren Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 University of Chinese Academy of Sciences Beijing 100190 Shanghai Engineering Center for Microsatellites Shanghai 201203 National Satellite Meteorological Center

The Chinese global carbon dioxide monitoring satellite(TanSat)was successfully launched in December 2016 and has completed its on-orbit tests and *** aims to measure the atmospheric Carbon Dioxide column-averaged dry air mole fractions(X_(CO_2))with a precision of 4 ppm at the regional scale,and further to derive the CO_2 global and regional *** toward these objectives is reviewed and the first scientific results from TanSat measurements are *** the design phase,Observation System Simulation Experiments(OSSE)on TanSat measurements performed prior to launch measurements using a nadir and a glint alternative mode when considering the balance of stable measurements and reduces the flux uncertainty(64%).The constellation measurements of two satellites indicate an extra 10%improvement in flux inversion if the satellite measurements have no bias and similar *** TanSat on-orbit test indicates that the instrument is stable and beginning to produce X_(CO_2)*** preliminary TanSat measurements have been validated with Total Carbon Column Observing Network(TCCON)measurements and have inter-compared with OCO-2 measurements in an overlap measurement.

关键词：科学开车二氧化碳监视卫星干燥空气设计阶段地区性 ppm

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Capability of Fengyun-3D Satellite in Earth System Observation

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Journal of Meteorological Research 2019年第6期33卷 1113-1130页

作者： Zhongdong YANG Peng ZHANG songyan gu Xiuqin HU Shihao TANG Leiku YANG Na XU Zhaojun ZHEN Ling WANG Qiong WU Fangli DOU Ruixia LIU Xiao WU Ling ZHU Liyang ZhANG Sujuan WANG Yueqiang SUN Weihua BAI National Satellite Meteorological Center China Meteorological AdministrationBeijing 100081 Henan Polytechnic University Jiaozuo 454000 National Space Science Center Chinese Academy of SciencesBeijing 100190

From the viewpoint of earth system science,this paper discusses the observation capability of the second-generation of Chinese polar-orbiting,sun-synchronous operational meteorological satellite observation systems,Fengyun-3(FY-3),based on the function and performance test results from the FY-3 D satellite observation system in *** FY-3 series of satellites have numerous remote sensing instruments and a wide range of imaging and sounding electromagnetic spectrometers *** instruments can obtain reflectivity data for land surface,soil,vegetation,water body,snow cover,ocean color,and sea ice on earth’s surface over a wide spectral range,as well as information on the absorption and scattering radiative transfer of molecules and particles(clouds and aerosols)in earth’s *** of these data can be used to retrieve physical and chemical information about the land,ocean,and atmosphere of the earth *** observation of the earth system by the FY-3 meteorological satellites is preliminarily realized.

关键词： Fengyun-3 meteorological satellites earth system observation advanced instruments remote sensing information products

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FY-3G Satellite Instruments and Precipitation Products:First Report of China’s Fengyun Rainfall Mission In-Orbit

Journal of Remote Sensing

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Journal of Remote Sensing 2023年第1期3卷 463-476页

作者： Peng Zhang songyan gu Lin Chen Jian Shang Manyun Lin Aijun Zhu Honggang Yin Qiong Wu Yixuan Shou Fenglin Sun Hanlie Xu guanglin Yang Haofei Wang Lu Li HongWei Zhang Sijie Chen Naimeng Lu Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites National Satellite Meteorological Center(National Center for Space Weather)China Meteorological AdministrationBeijingChina Innovation Center for FengYun Meteorological Satellite BeijingChina Shanghai Academy of Spaceflight Technology ShanghaiChina

Precipitation is one of the most important parameters in Earth system but is hard to *** began to develop satellites dedicated to precipitation measurements in the second generation of the FengYun polarorbiting meteorological satellite program(FY-3).The first of total 2 rainfall missions scheduled,FY-3G,was successfully launched on 16 April 2023 and became the world’s third satellite to measure precipitation with space-borne radar after the tropical rainfall measuring mission in 1997 and global precipitation measurement core observatory in *** this manuscript,we illustrate the platform of FY-3G and instruments mounted in great detail,with additional information about ground segments,designed sensor-based products,and retrieval of geophysical *** the 4 months after launch,the specifications of the platform and instruments are under inspection as calibration and validation are carefully *** first images captured by FY-3G are encouraging,and initial results show a strong capability for providing insights into all kinds of precipitation *** important work of data processing,such as data assimilation,data fusion between space-based and ground-based radar,and that between polar and geostationary satellites,as well as future applications in weather modification,has been prepared in *** a pioneer of China’s rainfall missions,FY-3G greatly improves our ability to provide global precipitation measurements,understand Earth’s water and energy cycle,and forecast extreme events for the benefit of society.

关键词： Earth mounted instruments

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毫米/亚毫米波探测大气温度和湿度的通道选择

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应用气象学报 2010年第6期21卷 716-723页

作者：郭杨卢乃锰谷松岩中国气象科学研究院北京100081 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国家卫星气象中心北京100081

利用热带大气温湿廓线计算了热带地区毫米/亚毫米波段微波大气透过率权重函数。对权重函数峰值高度的分析结果显示:对流层低层的大气温度可以选择118 GHz通道的远翼频率来探测,而对高层大气温度进行探测时,选择425 GHz通道的远翼频率较... 详细信息

利用热带大气温湿廓线计算了热带地区毫米/亚毫米波段微波大气透过率权重函数。对权重函数峰值高度的分析结果显示:对流层低层的大气温度可以选择118 GHz通道的远翼频率来探测,而对高层大气温度进行探测时,选择425 GHz通道的远翼频率较为合适;在大气湿度探测方面,183 GHz通道组合适合探测对流层中层大气的湿度,高层大气湿度探测应该首先考虑380 GHz通道组合来实现。根据大气温度探测通道和大气湿度探测通道的权重函数分布,鉴于国内现有遥感仪器的制造水平,建议选择118 GHz 3个通道与425 GHz 8个通道共11个大气温度探测通道和183 GHz 3个通道与380 GHz 5个通道共8个大气湿度探测通道作为未来静止轨道微波探测的候选通道。

关键词：静止轨道毫米/亚毫米波权重函数通道选择

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