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A Preview of AMSR: Airborne C-band Microwave Radiometer (ACMR) Observations from SGP99Although L-band is generally considered ideal for passive microwave sensing of soil moisture, near-future satellite observing systems such as Advanced Mechanically Scanned Radiometer (AMSR) will provide C-band data for several years before any L-band data might become available. The Southern Great Plains'99 (SGP99) Experiment was designed to generate C-band observations suitable for testing and refinement of AMSR-era soil moisture retrieval algorithms. C-band data collected using the Airborne C-band Microwave Radiometer (ACMR), a new high-accuracy NASA/GSFC instrument, clearly demonstrated a strong response to a 9-day drydown event as well as to differences between the northern (cooler & wetter) and southern (warmer & dryer) areas covered by the P-3 flights. For example, the H-polarized brightness temperatures observed during the first three days of the drydown increased up to 50 K in the northern areas. These observations represent a preview of what we can expect from AMSR, albeit at 3-km spatial resolution vs. approximately 60 km for AMSR. Initial results of soil-vegetation microwave modeling will also be presented to estimate the relative contributions of soil physical temperature, canopy physical temperature, soil moisture, and canopy moisture. Significant radio-frequency interference (RFI) was evident during the experiment, and amelioration strategies will be discussed. The net effect of RFI (an upward bias in brightnesses) when averaged over an AMSR footprint is expected to be more subtle.
Document ID
20000074793
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Kim, Edward
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Doiron, Terence
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Principe, Caleb
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Gong, Lei
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Shiue, James
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 2000
Subject Category
Earth Resources And Remote Sensing
Meeting Information
Meeting: International Geoscience and Remote Sensing Symposium (IGARSS)
Location: Honolulu, HI
Country: United States
Start Date: July 24, 2000
End Date: July 28, 2000
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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