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Open AccessArticle

Preliminary Inter-Comparison between AHI, VIIRS and MODIS Clear-Sky Ocean Radiances for Accurate SST Retrievals

NOAA Center for Satellite Application and Research (STAR), College Park, MD 20740, USA
CSU, Cooperative Institute for Research in the Atmospheres (CIRA), Fort Collins, CO 80523, USA
GST Inc., Greenbelt, MD 20740, USA
ERT Inc., Laurel, MD 20707, USA
Author to whom correspondence should be addressed.
Academic Editors: Changyong Cao, Magaly Koch and Prasad S. Thenkabail
Remote Sens. 2016, 8(3), 203;
Received: 19 November 2015 / Revised: 27 January 2016 / Accepted: 18 February 2016 / Published: 1 March 2016
(This article belongs to the Collection Visible Infrared Imaging Radiometers and Applications)
Clear-sky brightness temperatures (BT) in five bands of the Advanced Himawari Imager (AHI; flown onboard Himawari-8 satellite) centered at 3.9, 8.6, 10.4, 11.2, and 12.3 µm (denoted by IR37, IR86, IR10, IR11, and IR12, respectively) are used in the NOAA Advanced Clear-Sky Processor for Oceans (ACSPO) sea surface temperature (SST) retrieval system. Here, AHI BTs are preliminarily evaluated for stability and consistency with the corresponding VIIRS and MODIS BTs, using the sensor observation minus model simulation (O-M) biases and corresponding double differences. The objective is to ensure accurate and consistent SST products from the polar and geo sensors, and to prepare for the launch of the GOES-R satellite in 2016. All five AHI SST bands are found to be largely in-family with their polar counterparts, but biased low relative to the VIIRS and MODIS (which, in turn, were found to be stable and consistent, except for Terra IR86, which is biased high by 1.5 K). The negative biases are larger in IR37 and IR12 (up to ~−0.5 K), followed by the three remaining longwave IR bands IR86, IR10, and IR11 (from −0.3 to −0.4 K). These negative biases may be in part due to the uncertainties in AHI calibration and characterization, although uncertainties in the coefficients of the Community Radiative Transfer Model (CRTM, used to generate the “M” term) may also contribute. Work is underway to add AHI analyses in the NOAA Monitoring of IR Clear-Sky Radiances over Oceans for SST (MICROS) system and improve AHI BTs by collaborating with the sensor calibration and CRTM teams. The Advanced Baseline Imager (ABI) analyses will be also added in MICROS when GOES-R is launched in late 2016 and the ABI IR data become available. View Full-Text
Keywords: SST; AHI; VIIRS; MODIS; Himawari-8; S-NPP; Terra; Aqua; MICROS; ACSPO SST; AHI; VIIRS; MODIS; Himawari-8; S-NPP; Terra; Aqua; MICROS; ACSPO
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Liang, X.; Ignatov, A.; Kramar, M.; Yu, F. Preliminary Inter-Comparison between AHI, VIIRS and MODIS Clear-Sky Ocean Radiances for Accurate SST Retrievals. Remote Sens. 2016, 8, 203.

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