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Proceedings Paper

Improvements to radiometric consistency between AVHRR, MODIS, and VIIRS in SST bands using MICROS online near-real time system
Author(s): Xingming Liang; Alexander Ignatov; Quanhua Liu; Yong Chen; David Groff; Xiaoxiong Xiong; Changyong Cao; Eva Borbas; Simon Hook
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Paper Abstract

Monitoring of IR Clear-Sky Radiances over Oceans for SST nearreal time web-based system has been established in July 2008. It analyzes Model (Community Radiative Transfer Model, CRTM) minus Observation (M-O) biases in clear-sky ocean brightness temperatures (BT) in AVHRR bands 3.7 (IR37), 11 (IR11), and 12μm (IR12) onboard NOAA-16, -17, -18, -19 and Metop-A. In January 2012, AVHRR-like bands of VIIRS onboard the Suomi National Polar Partnership (S-NPP; launched in October 2012), and two MODIS instruments onboard Terra and Aqua, were included in MICROS. Double-differences are employed to check various sensors for radiometric consistency. The VIIRS and AVHRR have been in-family, and the consistency further improved after the VIIRS IR calibration was fine-tuned on 7 March 2012. However, MODIS M-O biases have been out of family (by -0.6K in IR 11, and -0.3K in IR12). Analyses have shown that these anomalies in MODIS M-O biases are caused by the "M" term, i.e., incorrect MODIS transmittance coefficients in CRTM v2.02. Based on feedback from NESDIS SST and U. Wisconsin Teams, CRTM Team updated transmittance coefficients in CRTM v2.10. As a result, MODIS M-O biases are now in agreement with AVHRR/VIIRS. However, cross-platform Terra/Aqua bias of ~0.3 K in Ch20 (3.9μm) remains, likely due to calibration uncertainties in MODIS L1b product. This paper documents the joint effort by the SST, MODIS Characterization Support and CRTM Teams towards identifying and resolving observed cross-platform inconsistencies.

Paper Details

Date Published: 9 November 2012
PDF: 12 pages
Proc. SPIE 8528, Earth Observing Missions and Sensors: Development, Implementation, and Characterization II, 85280I (9 November 2012); doi: 10.1117/12.979597
Show Author Affiliations
Xingming Liang, National Oceanic and Atmospheric Administration (United States)
Cooperative Institute for Research in the Atmospheres (United States)
Alexander Ignatov, National Oceanic and Atmospheric Administration (United States)
Quanhua Liu, National Oceanic and Atmospheric Administration (United States)
I.M. Systems Group Inc. (United States)
Yong Chen, National Oceanic and Atmospheric Administration (United States)
Cooperative Institute for Research in the Atmospheres (United States)
David Groff, I.M. Systems Group, Inc. (United States)
National Ctr. for Environmental Prediction (United States)
Xiaoxiong Xiong, NASA Goddard Space Flight Ctr. (United States)
Changyong Cao, National Oceanic and Atmospheric Administration (United States)
Eva Borbas, Univ. of Wisconsin-Madison (United States)
Simon Hook, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 8528:
Earth Observing Missions and Sensors: Development, Implementation, and Characterization II
Haruhisa Shimoda; Xiaoxiong Xiong; Changyong Cao; Xingfa Gu; Choen Kim; A. S. Kiran Kumar, Editor(s)

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