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An Assessment of New and Current Microwave Land Emissivity Models: Progress Report

An Assessment of New and Current Microwave Land Emissivity Models: Progress Report. Models and Data. JCSDA-CRTM associated with LandEM developed by Weng et al. (2001) (next stage: Multi-layer LandEM) NCEP GDAS atmospheric and surface products AMSR-E L2A (The AMSR-E Level-2A product

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An Assessment of New and Current Microwave Land Emissivity Models: Progress Report

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  1. An Assessment of New and Current Microwave Land Emissivity Models: Progress Report

  2. Models and Data • JCSDA-CRTM associated with LandEM developed by Weng et al. (2001) (next stage: Multi-layer LandEM) • NCEP GDAS atmospheric and surface products • AMSR-E L2A (The AMSR-E Level-2A product contains brightness temperatures at 6.9 GHz, 10.7 GHz, 18.7 GHz, 23.8 GHz, 36.5 GHz, and 89.0 GHz)

  3. Difference between simulated and observed data ΔTB= TBs-TBo • Model’s system bias. • Unaccurate GDAS profiles generally result in some bias. • Model doesn’t simulate well over desert areas. • Model’s simulated result has large bias over mountain and plateau areas. • ?

  4. ΔTB at 10.65 GHz to 89.0 GHz (1)

  5. ΔTB at 10.65 GHz to 89.0 GHz (2)

  6. ΔTB at 10.65 GHz to 89.0 GHz (3) • Bias is -10K~20K.

  7. Radio-Frequency Interference (RFI) at 6.925 GHz ■TBv ■TBh ■TBv ■TBh ± 5K ± 20K • It is likely contaminated by microwave Radio-Frequency Interference (RFI). • RFI can increase brightness temperatures significantly at a lower frequency and generate negative spectral gradient . • Brightness temperature relationship between 6.925 and 10.65 GHz, 7/27/2008 • simulated from microwave emissivity model • observed from AMSR-E.

  8. On-Going Work • Assess New Microwave Land Emissivity Model • To develop an RFI algorithm to remove and identify RFI.

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