NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
land surface microwave emissivities derived from amsr-e and modis measurements with advanced quality controlA microwave emissivity database has been developed with data from the Advanced Microwave Scanning Radiometer-EOS (AMSR-E) and with ancillary land surface temperature (LST) data from the Moderate Resolution Imaging Spectroradiometer (MODIS) on the same Aqua spacecraft. The primary intended application of the database is to provide surface emissivity constraints in atmospheric and surface property retrieval or assimilation. An additional application is to serve as a dynamic indicator of land surface properties relevant to climate change monitoring. The precision of the emissivity data is estimated to be significantly better than in prior databases from other sensors due to the precise collocation with high-quality MODIS LST data and due to the quality control features of our data analysis system. The accuracy of the emissivities in deserts and semi-arid regions is enhanced by applying, in those regions, a version of the emissivity retrieval algorithm that accounts for the penetration of microwave radiation through dry soil with diurnally varying vertical temperature gradients. These results suggest that this penetration effect is more widespread and more significant to interpretation of passive microwave measurements than had been previously established. Emissivity coverage in areas where persistent cloudiness interferes with the availability of MODIS LST data is achieved using a classification-based method to spread emissivity data from less-cloudy areas that have similar microwave surface properties. Evaluations and analyses of the emissivity products over homogeneous snow-free areas are presented, including application to retrieval of soil temperature profiles. Spatial inhomogeneities are the largest in the vicinity of large water bodies due to the large water/land emissivity contrast and give rise to large apparent temporal variability in the retrieved emissivities when satellite footprint locations vary over time. This issue will be dealt with in the future by including a water fraction correction. Also note that current reliance on the MODIS day-night algorithm as a source of LST limits the coverage of the database in the Polar Regions. We will consider relaxing the current restriction as part of future development.
Document ID
20110023836
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Moncet, Jean-Luc
(Atmospheric and Environmental Research, Inc. Lexington, MA, United States)
Liang, Pan
(Atmospheric and Environmental Research, Inc. Lexington, MA, United States)
Galantowicz, John F.
(Atmospheric and Environmental Research, Inc. Lexington, MA, United States)
Lipton, Alan E.
(Atmospheric and Environmental Research, Inc. Lexington, MA, United States)
Uymin, Gennady
(Atmospheric and Environmental Research, Inc. Lexington, MA, United States)
Prigent, Catherine
(Observatoire de Paris France)
Grassotti, Christopher
(Atmospheric and Environmental Research, Inc. Lexington, MA, United States)
Date Acquired
August 25, 2013
Publication Date
August 16, 2011
Publication Information
Publication: Journal of Geophysical Research - Atmospheres
Volume: 116
ISSN: 01 48-022711
Subject Category
Geophysics
Funding Number(s)
CONTRACT_GRANT: NNH04CC43C
CONTRACT_GRANT: NNH08CC96C
Distribution Limits
Public
Copyright
Other