| Paper: | WE-A1.4 |
| Session: | Land Applications of Radiometry I |
| Time: | Wednesday, March 28, 10:00 - 10:20 |
| Presentation: |
Oral
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| Topic: |
Soil moisture, soil state and vegetation: |
| Title: |
Science and Applications Using the Global NASA Soil Moisture Active Passive (SMAP) Satellite Mission L-Band Radiometry Measurements |
| Authors: |
Dara Entekhabi; Massachusetts Institute of Technology | | |
| | Simon Yueh; NASA Jet Propulsion Laboratory | | |
| | Peggy O'Neill; NASA Goddard Space Flight Center | | |
| | Jared Entin; NASA HQ | | |
| Abstract: |
NASA’s Soil Moisture Active Passive (SMAP) mission now has accumulated measurements from multiple northern hemisphere warm seasons and freeze/thaw cycles. The science products and their assessment reports are distributed through a public archive (NSIDC). The global L-band radiometry from SMAP has enabled investigations in and between water, energy and carbon cycle research, terrestrial ecology, and ocean science. These include eliciting the role of soil moisture control on the evaporation regime and vegetation gross primary productivity, observing soil-vegetation continuum water relationships, analysis of floods and droughts, climate modeling and weather prediction, detecting ocean high-winds during tropical storms, and observing fresh-water outflow into coastal oceans. The SMAP instruments have been calibrated using data from other satellites and external stable target such as locations in central Antarctica, tropical oceans and dense forests. The calibration of SMAP radiometer’s noise diode was achieved using ocean targets and cold sky. Cross-comparison with the European Space Agency’s Soil Moisture and Ocean Salinity (SMOS) radiometer data over land and ocean surfaces indicates in good agreement. This paper outlines the changes to the data processing (L1 brightness temperature and L2 geophysical products) as a result of the observed global L-band radiometry. Recently the project added enhanced radiometry products based on Backus Gilbert optimum interpolation that take advantage of the oversampling characteristics of the SMAP radiometer. The data are gridded so that aliasing effects are reduced. A second new product type investigates the disaggregation of the SMAP L-band radiometer data using the Copernicus’s Sentinel-1A and Sentinel-1B C-band synthetic aperture radar (SAR) data to obtain soil moisture products at about 1 to 3 km resolution.
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