NOAA-20 and S-NPP VIIRS Thermal Emissive Bands On-Orbit Calibration Algorithm Update and Long-Term Performance Inter-Comparison

被引:18
作者
Wang, Wenhui [1 ]
Cao, Changyong [2 ]
机构
[1] Univ Maryland, ESSIC, CISESS, College Pk, MD 20740 USA
[2] NOAA, NESDIS, Ctr Satellite Applicat & Res, College Pk, MD 20740 USA
关键词
NOAA-20; S-NPP; VIIRS; Thermal Emissive Bands (TEB); Sensor Data Record (SDR); operational processing; radiometric calibration; blackbody; warm-up; cool-down (WUCD) bias correction;
D O I
10.3390/rs13030448
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The Visible Infrared Imaging Radiometer Suite (VIIRS) on board the National Oceanic and Atmospheric Administration-20 (NOAA-20) and the Suomi National Polar-orbiting Partnership Program (S-NPP) satellites were launched in late 2017 and 2011, respectively. This paper presents a recent update in the VIIRS thermal emissive bands (TEB) on-orbit calibration algorithm and inter-compares long-term instrument and TEB sensor data records (SDR) performances of the two VIIRS, to support user communities. The VIIRS TEB calibration algorithm was improved to mitigate calibration biases during the blackbody warm-up/cool-down (WUCD) events. Four WUCD bias correction methods were implemented in the NOAA operational processing in 2019: (1) the Nominal-F method, (2) the WUCD-C method, (3) the Ltrace method, and (4) the Ltrace-2 method. Our evaluation results indicate that the on-orbit performances of the two VIIRS instruments have been generally stable and comparable with each other, except that NOAA-20 VIIRS blackbody and instrument temperatures are lower than those of the S-NPP VIIRS. The degradations in the S-NPP TEB detector responsivities remain small after 9 years on-orbit. NOAA-20 detector responsivities have been generally stable after the longwave infrared degradation during its early mission was resolved by the mid-mission outgassing. NOAA-20 and S-NPP VIIRS TEB SDRs agree with co-located Cross-track Infrared Sounder observations, with daily averaged biases within 0.1 K at nadir. After the implementation of operational WUCD bias correction, residual TEB WUCD biases are similar for NOAA-20 and S-NPP, with daily averaged biases similar to 0.01 K in all bands.
引用
收藏
页码:1 / 16
页数:16
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