Effects of Linear Calibration Errors at Low-Temperature End of Thermal Infrared Band: Lesson From Failures in Cloud Top Property Retrieval of FengYun-4A Geostationary Satellite

被引：7

作者：

Wang, Fu ^{[1
,2
]}

Min, Min ^{[3
,4
,5
]}

Xu, Na ^{[6
]}

Liu, Chao ^{[7
]}

Wang, Zhiwei ^{[6
]}

Zhu, Lin ^{[6
]}

机构：

[1] China Meteorol Adm CMA, CMA Earth Syst Modeling & Predict Ctr CEMC, State Key Lab Severe Weather LaSW, Beijing 100081, Peoples R China

[2] China Meteorol Adm CMA, Natl Satellite Meteorol Ctr NSMC, Beijing 100081, Peoples R China

[3] Sun Yat Sen Univ, Sch Atmospher Sci, Guangzhou 510275, Peoples R China

[4] Sun Yat Sen Univ, Guangdong Prov Key Lab Climate Change & Nat Disas, Guangzhou 510275, Peoples R China

[5] Southern Lab Ocean Sci & Engn, Zhuhai 519082, Guangdong, Peoples R China

[6] China Meteorol Adm CMA, Key Lab Radiometr Calibrat & Validat Environm Sat, Natl Satellite Meteorol Ctr NSMC, Beijing 100081, Peoples R China

[7] Nanjing Univ Informat Sci & Technol, China Meteorol Adm, Key Lab Aerosol Cloud Precipitat, Sch Atmospher Phys, Nanjing 210044, Jiangsu, Peoples R China

来源：

IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 2022年 / 60卷

基金：

中国国家自然科学基金;

关键词：

Advanced Geostationary Radiation Imager of FengYun-4A (FY-4A/AGRI); calibration; cloud top properties (CTPs); thermal infrared (TIR) band; ON-ORBIT PERFORMANCE; NEXT-GENERATION; IMAGER; ALGORITHM; CHANNELS; SCATTERING; REGION; MODEL;

D O I：

10.1109/TGRS.2022.3140348

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Cloud top properties (CTPs) are important satellite products. However, the failures of CTPs derived from the Advanced Geostationary Radiation Imager of FengYun-4A (FY-4A/AGRI) have been occasionally reported by users. To this end, the feasibility of the operational CTP algorithm has been reviewed. First, this study reveals the slight differences in brightness temperature (BT) maps of thermal infrared (TIR) bands between two different imagers. Further analyses found that the nonretrieved pixels of CTP products from FY-4A/AGRI usually have a negative value down to -13 K in 10.8-13.5-mu m BT difference (BTD10.8-13.5 mu m), and the joint distribution related to BTD10.8-13.5 mu m and BTD10.8-12 mu m is well separated from those successfully retrieved ones. These findings are confirmed by the simulations of the radiative transfer forward model (approaching -12 K or lower) and the cross-validation between the products from AGRI/FY-4A and the Infrared Atmospheric Sounding Interferometer of Meteorological Operational Satellite Program-Satellite B. In essence, the bias at the 13.5-mu m band is mainly affected by the relatively low accuracy and stability at the low-temperature end. Based on these findings, we have proposed a novel method to estimate calibration-related measurement biases of TIR bands and track their in-orbit stability. The statistical study based on the FY-4A/AGRI observations reveals significant daily and diurnal variations in performance and provides an insight into its stability at the TIR band (13.5 mu m).

引用

页数：11