Continuing the MODIS Dark Target Aerosol Time Series with VIIRS
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Date
2020-01-17
Type of Work
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Citation of Original Publication
Sawyer, Virginia; Levy, Robert C.; Mattoo, Shana; Cureton, Geoff; Shi, Yingxi; Remer, Lorraine A. 2020. "Continuing the MODIS Dark Target Aerosol Time Series with VIIRS." Remote Sens. 12, no. 2: 308.
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Public Domain Mark 1.0
This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
Public Domain Mark 1.0
This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
Subjects
Abstract
For reflected sunlight observed from space at visible and near-infrared wavelengths,
particles suspended in Earth’s atmosphere provide contrast with vegetation or dark water at the
surface. This is the physical motivation for the Dark Target (DT) aerosol retrieval algorithm developed
for the Moderate Resolution Imaging Spectrometer (MODIS). To extend the data record of aerosol
optical depth (AOD) beyond the expected 20-year lifespan of the MODIS sensors, DT must be adapted
for other sensors. A version of the DT AOD retrieval for the Visible Infrared Imaging Radiometer
Suite (VIIRS) on the Suomi-National Polar-Orbiting Partnership (SNPP) is now mature enough to be
released as a standard data product, and includes some upgraded features from the MODIS version.
Di erences between MODIS Aqua and VIIRS SNPP lead to some inevitable disagreement between
their respective AOD measurements, but the o set between the VIIRS SNPP and MODIS Aqua
records is smaller than the o set between those of MODIS Aqua and MODIS Terra. The VIIRS SNPP
retrieval shows good agreement with ground-based measurements. For most purposes, DT for VIIRS
SNPP is consistent enough and in close enough agreement with MODIS to continue the record of
satellite AOD. The reasons for the o set from MODIS Aqua, and its spatial and temporal variability,
are investigated in this study.