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Analysis of Brightness Temperature Measurement Biases and Their Contributing Factors for FY-4A and FY-4B Satellites
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Zhaoyu OU1, 2, Yilun CHEN1, 2, Shiyu LI1, 2, Aoqi ZHANG1, 2, Weibiao LI1, 2
Chinese Journal of Atmospheric Sciences | 2026, 50(4) : 1165 - 1178
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Chinese Journal of Atmospheric Sciences | 2026, 50(4): 1165-1178
• Articles •
Analysis of Brightness Temperature Measurement Biases and Their Contributing Factors for FY-4A and FY-4B Satellites
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Zhaoyu OU1, 2, Yilun CHEN1, 2, Shiyu LI1, 2, Aoqi ZHANG1, 2, Weibiao LI1, 2
Affiliations
  • 1School of Atmospheric Sciences and Key Laboratory of Tropical Atmosphere-Ocean System, Ministry of Education, Sun Yat-sen University, Zhuhai 519082
  • 2Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080
Published: 2026-07-15 doi: 10.3878/j.issn.1006-9895.2508.25050
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Dual-satellite observations of FY-4A and FY-4B exhibit continuity and complementarity, but differences in the satellites’ positions and observation paths may make their actual detection results inconsistent. This study, which is based on the AGRI full-disk Level 1 data and cloud top height products from dual-satellite imagers during June–August 2022, conducted parallax correction on the dual-satellite data and analyzed differences in thermal infrared channel brightness temperatures (BTs) under various cloud height scenarios and underlying surface conditions. The results showed that within the common observation area, the BT differences between FY-4A and FY-4B gradually turned positive to negative from west to east. In the equatorial region, the BT differences reached 8 K. As cloud height increases, the root mean square error of the BT differences increases from 1.63 K to 3.06 K. The differences were larger over land than over the ocean. Additionally, this study investigated the theoretical effects of satellite zenith angle on dual-satellite BT differences using the RTTOV fast radiative transfer model. Simulated BT difference trends between the satellites show broad consistency with observed empirical trends. Therefore, future research can perform physical correction on the dual-satellite observations according to these patterns, enabling joint applications of the dual-satellite data.

FY-4A satellite  /  FY-4B satellite  /  Brightness temperature comparison  /  Cloud height  /  Satellite zenith angle
欧沼余, 陈逸伦, 黎诗瑜, 张奡祺, 黎伟标. 风云四号双星亮温测量偏差及成因分析. 大气科学, 2026 , 50 (4) : 1165 -1178 . DOI: 10.3878/j.issn.1006-9895.2508.25050
Zhaoyu OU, Yilun CHEN, Shiyu LI, Aoqi ZHANG, Weibiao LI. Analysis of Brightness Temperature Measurement Biases and Their Contributing Factors for FY-4A and FY-4B Satellites[J]. Chinese Journal of Atmospheric Sciences, 2026 , 50 (4) : 1165 -1178 . DOI: 10.3878/j.issn.1006-9895.2508.25050
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Year 2026 volume 50 Issue 4
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Article Info
doi: 10.3878/j.issn.1006-9895.2508.25050
  • Receive Date：2025-03-25
  • Online Date：2026-09-30
  • Published：2026-07-15
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  • Received：2025-03-25
Affiliations
    1School of Atmospheric Sciences and Key Laboratory of Tropical Atmosphere-Ocean System, Ministry of Education, Sun Yat-sen University, Zhuhai 519082
    2Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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