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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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doi:10.5194/amt-2016-238
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
17 Aug 2016
Review status
A revision of this discussion paper was accepted for the journal Atmospheric Measurement Techniques (AMT) and is expected to appear here in due course.
Vicarious calibration of S-NPP VIIRS reflective solar M-bands against MODIS Aqua over dark water scenes
A. M. Sayer1,2, N. C. Hsu1, C. Bettenhausen1,3, R. E. Holz4, J. Lee1,5, G. Quinn4, and P. Veglio4 1NASA Goddard Space Flight Center, Greenbelt, MD, USA
2Goddard Earth Sciences Technology And Research (GESTAR), Universities Space Research Association (USRA), Columbia, MD, USA
3Science Systems and Applications, Inc, MD, USA
4Space Science and Engineering Center, University of Wisconsin, Madison, WI, USA
5Earth Systems Science Interdisciplinary Center (ESSIC), University of Maryland, College Park, MD, USA
Abstract. The Visible Infrared Imaging Radiometer Suite (VIIRS) is being used to continue the record of Earth Science observations and data products produced routinely from National Aeronautics and Space Administration (NASA) Moderate Resolution Imaging Spectroradiometer (MODIS) measurements. However, the absolute calibration of VIIRS's reflected solar bands is thought to be biased, leading to offsets in derived data products such as aerosol optical depth (AOD) when similar algorithms are applied to the different sensors. This study presents a vicarious calibration of these VIIRS bands against MODIS Aqua over dark water scenes, finding corrections to VIIRS between approximately +2 % and −7 % (dependent on band) are needed to bring the two into alignment, and indications of relative trending of up to ~ 0.45 % per year in some bands. The derived vicarious gains are also applied in an AOD retrieval, and are shown to decrease the bias and total error in AOD across the midvisible spectral region compared to the standard VIIRS NASA calibration. The resulting bias characteristics are similar to those of NASA MODIS AOD data products, which is encouraging in terms of multisensor data continuity.

Citation: Sayer, A. M., Hsu, N. C., Bettenhausen, C., Holz, R. E., Lee, J., Quinn, G., and Veglio, P.: Vicarious calibration of S-NPP VIIRS reflective solar M-bands against MODIS Aqua over dark water scenes, Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2016-238, in review, 2016.
A. M. Sayer et al.
A. M. Sayer et al.
A. M. Sayer et al.

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Short summary
The satellite instrument VIIRS is being used to carry on observations of the Earth made by older satellites like MODIS. Data sets created from these satellite observations depend on the quality of the satellite instruments' calibration. This paper describes a comparison between the calibration of these two sensors. MODIS is believed to be more reliable and so VIIRS is corrected to bring it in line with MODIS. These corrections are shown to improve the quality of VIIRS aerosol data.
The satellite instrument VIIRS is being used to carry on observations of the Earth made by older...
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