Evaluating the calibration of Aqua MODIS bands 33, 35, and 36 during blackbody warm-up cool-down events

Yonghong Li; Aisheng Wu; Xiaoxiong Xiong

doi:10.1117/12.2324503

23 October 2018 Evaluating the calibration of Aqua MODIS bands 33, 35, and 36 during blackbody warm-up cool-down events

Yonghong Li, Aisheng Wu, Xiaoxiong Xiong

Proceedings Volume 10781, Earth Observing Missions and Sensors: Development, Implementation, and Characterization V; 1078115 (2018) https://doi.org/10.1117/12.2324503
Event: SPIE Asia-Pacific Remote Sensing, 2018, Honolulu, Hawaii, United States

Abstract

Aqua MODIS is the second MODIS instrument of NASA’s Earth Observation System and has operated for over sixteen years since its launch in 2002. MODIS has sixteen thermal emissive bands (TEBs) located on two separate cold focal plane assemblies (CFPA). The TEBs are calibrated every scan using observations of an onboard blackbody (BB) and a space view port. Low saturation temperatures (Tsat) of Aqua MODIS bands 33, 35, and 36 cause these bands to saturate when the BB temperature is higher than their Tsat values during a BB warm-up cool-down (WUCD) cycle, therefore impacting the ability to perform nominal calibration. In addition, starting from around 2006, the CFPA temperature showed gradual variation from its nominally-controlled operating temperature due to a loss of its radiative cooler margin and the magnitude of its fluctuation reaching a maximum in 2013. The MODIS Characterization Support Team currently uses a correction that is dependent on the CFPA temperature to provide a gain estimate for the saturated scans during the BB WUCD. This gain estimation has been implemented in the Aqua MODIS Collection 6 (C6) and C6.1 L1B products. This paper evaluates the quality of the calibrated radiance of Aqua MODIS bands 33, 35, and 36 using simultaneous nadir observations from the Atmospheric Infrared Sounder (AIRS), which is also onboard the Aqua satellite. Our analysis results show that the differences between AIRS and Aqua MODIS can be controlled well within the fluctuation range compared to the periods when the BB signals for these bands are not saturated.

Citation Download Citation

Yonghong Li, Aisheng Wu, and Xiaoxiong Xiong "Evaluating the calibration of Aqua MODIS bands 33, 35, and 36 during blackbody warm-up cool-down events", Proc. SPIE 10781, Earth Observing Missions and Sensors: Development, Implementation, and Characterization V, 1078115 (23 October 2018); https://doi.org/10.1117/12.2324503

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KEYWORDS

MODIS

Calibration

Long wavelength infrared

Black bodies

Mirrors

Sensors

Infrared radiation

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