摘要
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。
The Microwave Temperature Sounder(MWTS),an essential sensor onboard China's second-generation polar-orbiting meteorological satellites(FY-3),measures the vertical structure of atmospheric temperature profilesusing oxygen absorption in the 50-60 GHz frequency range.Since 2008,MWTS and its improved instruments have been deployed on FY-3A satellite(2008),FY-3B satellite(2010),FY-3C satellite(2013),and FY-3D satellite(2017),accumulating over a decade of observational data.While many researchers have utilized historical data from MSU and AMSU to study upper atmospheric trends,long-term datasets of high-altitude brightness temperatures incorporating data from domestic satellites remain scarce.The reliability of these domestic satellite datasets is crucial for constructingsuch long-term records.Therefore,this study assesses the quality of the FY-3 MWTS data by comparing them with synchronous observations from other instruments,such as METOP-A and Suomi-NPP.Our analysis shows that the average biases in the middle and upper tropospheric channels(53.596 GHz)between FY-3A/B/C/D and other instruments have been significantly reduced post-calibration,from-1.6679/-1.2156/-2.2664/-0.0194 K to-0.0097/0.0077/0.0086/0.0554 K,respectively.The standard deviations have also improved,reducing from 0.4742/0.4704/0.3736/0.4420 to 0.1646/0.2080/0.2875/0.2416,respectively.For the lower stratospheric channels(57.290 GHz),the average biases were reduced from 0.2364/0.5675/-3.9333/0.2188 K to-0.1013/-0.2220/0.0533/-0.0332 K,respectively,and the standard deviations from 0.8750,1.3440,0.2308,1.0742 to 0.6906,0.7834,0.2774,0.1781,respectively.These results indicate a steady improvement in the detection performance of MWTS onboard FY-3A/B/C/D satellites.The recalibrated datasets effectively address issues such as abnormal data jumps during satellite orbits,radiation response decay in remote sensing instruments,and calibration differences between various satellites.The deviations between recalibrated data and references are within±0.1 K in both t
作者
曹皓东
张鹏
廖蜜
谷松岩
安大伟
郭杨
CAO Haodong;ZHANG Peng;LIAO Mi;Gu Songyan;An Dawei;Guo Yang(Chinese Academy of Meteorological Sciences,Beijing 100081,China;National Satellite Meteorological Center(National Center for Space Weather),China Meteorological Administration,Beijing 100081,China;Innovation Center for FY Meteorological Satellite(FYSIC),Beijing 100081,China;Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites,Beijing 100081,China)
出处
《大气科学学报》
CSCD
北大核心
2024年第4期669-680,共12页
Transactions of Atmospheric Sciences
基金
国家重点研发计划项目(2018YFB0504900)。
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
Feng Yun satellite
microwave thermometer
long-series historical data
recalibration
data quality assessment
