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Accounting for Static and Dynamic Open Water in the Modeling of SMAP Brightness Temperatures over PeatlandsHydrological change in peatlands due to anthropogenic disturbance and global warming can release enormous amounts of greenhouse gas emissions. Passive microwave satellite observations are an opportunity to globally monitor these changes. Abundant static and dynamic open water surfaces in peatlands strongly affect observed brightness temperatures (Tb). Here, we account for these contributions in radiative transfer modeling using NASA's Goddard Earth Observing System Model version 5 (GEOS-5) static open water mask and, for the dynamic open water fraction, the simulated inundated area using a version of the GEOS-5 Catchment land surface model that has been modified for peatland areas (PEAT-CLSM). Modeled Tb is compared against two years of SMAP L-band Tb. Preliminary results indicate: (i) a bias reduction when including the static open water fraction in a simple RTM mixing model, and ii) significantly improved correlation between modeled and observed Tb when using land surface output from PEAT-CLSM instead of the operational CLSM.
Document ID
20180005599
Acquisition Source
Goddard Space Flight Center
Document Type
Presentation
Authors
Bechtold, M. (Katholieke Univ. te Leuven Belgium)
De Canniere, S. (Katholieke Univ. te Leuven Belgium)
Reichle, R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
De Lannoy, Gabrielle (Katholieke Univ. te Leuven Belgium)
Date Acquired
September 26, 2018
Publication Date
July 22, 2018
Subject Category
Geosciences (General)
Report/Patent Number
GSFC-E-DAA-TN59596
Meeting Information
Meeting: International Geoscience and Remote Sensing Symposium (IGARSS)
Location: Valencia
Country: Spain
Start Date: July 22, 2018
End Date: July 27, 2018
Sponsors: Institute of Electrical and Electronics Engineers
Distribution Limits
Public
Copyright
Use by or on behalf of the US Gov. Permitted.
Keywords
passive microwave
soil moisture
organic soil
radiative transfer model
L-band

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