X. Zhan, NOAA-NESDIS-STAR, IGARSS 2011, Vancouver, Canada, 24-27 July, 2011. WHY DIFFERENT PASSIVE MICROWAVE ALGORITHMS WHY DIFFERENT PASSIVE MICROWAVE ALGORITHMS GIVE DIFFERENT SOIL MOISTURE RETRIEVALS GIVE DIFFERENT SOIL MOISTURE RETRIEVALS Xiwu Zhan, Jicheng Liu Xiwu Zhan, Jicheng Liu NOAA-NESDIS Center for Satellite Applications and Research, Camp Springs, NOAA-NESDIS Center for Satellite Applications and Research, Camp Springs, MD MD Thomas Holmes, Wade Crow, Tom Jackson Thomas Holmes, Wade Crow, Tom Jackson USDA-ARS Hydrology and Remote Sensing Lab, Beltsville, MD USDA-ARS Hydrology and Remote Sensing Lab, Beltsville, MD Steven Chan Steven Chan NASA-JPL, Pasadena, CA NASA-JPL, Pasadena, CA IGARSS 2011, Vancouver, Canada, 24-27 July, 2011
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WHY DIFFERENT PASSIVE MICROWAVE ALGORITHMS GIVE DIFFERENT SOIL MOISTURE RETRIEVALS
WHY DIFFERENT PASSIVE MICROWAVE ALGORITHMS GIVE DIFFERENT SOIL MOISTURE RETRIEVALS. Xiwu Zhan, Jicheng Liu NOAA-NESDIS Center for Satellite Applications and Research, Camp Springs, MD Thomas Holmes, Wade Crow, Tom Jackson USDA-ARS Hydrology and Remote Sensing Lab, Beltsville, MD Steven Chan - PowerPoint PPT Presentation
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WHY DIFFERENT PASSIVE MICROWAVE WHY DIFFERENT PASSIVE MICROWAVE ALGORITHMS GIVE DIFFERENT SOIL MOISTURE ALGORITHMS GIVE DIFFERENT SOIL MOISTURE
RETRIEVALSRETRIEVALS
Xiwu Zhan, Jicheng LiuXiwu Zhan, Jicheng LiuNOAA-NESDIS Center for Satellite Applications and Research, Camp Springs, MDNOAA-NESDIS Center for Satellite Applications and Research, Camp Springs, MD
Thomas Holmes, Wade Crow, Tom JacksonThomas Holmes, Wade Crow, Tom Jackson USDA-ARS Hydrology and Remote Sensing Lab, Beltsville, MDUSDA-ARS Hydrology and Remote Sensing Lab, Beltsville, MD
Steven ChanSteven Chan NASA-JPL, Pasadena, CANASA-JPL, Pasadena, CA
1.1. LPRM converges while MCI sometimes not;LPRM converges while MCI sometimes not;
2.2. Remove tau=f(MPDI) from LPRM and use Remove tau=f(MPDI) from LPRM and use Ts = f(Tb37v) for MCI;Ts = f(Tb37v) for MCI;
3.3. Perturb Tb37v, Tbh & Tbv for LPRM and MCI Perturb Tb37v, Tbh & Tbv for LPRM and MCI to test how they are sensitive to their errors.to test how they are sensitive to their errors.
1.1. Use GLDAS SM inverse tau with SCA eqns;Use GLDAS SM inverse tau with SCA eqns;
2.2. Use the inversed tau to retrieve SM as reference;Use the inversed tau to retrieve SM as reference;
3.3. Perturb Tb37v, Tbh for SCA retrievals to testPerturb Tb37v, Tbh for SCA retrievals to testhow they are sensitive to these errors.how they are sensitive to these errors.
The difference of current satellite soil moisture The difference of current satellite soil moisture products may confuse users.products may confuse users.
Single-Channel Algorithm relies heavily on accuracy of Single-Channel Algorithm relies heavily on accuracy of tau estimates.tau estimates.
LPRM algorithm uses a tau-MPDI relationship and TLPRM algorithm uses a tau-MPDI relationship and TB37vB37v
for Tfor Tss estimate to reduce iteration variable numbers in estimate to reduce iteration variable numbers in
solution procedure. Its sensitivity to Tsolution procedure. Its sensitivity to TBB calibration, T calibration, Tss
estimate and other parameter errors needs to be estimate and other parameter errors needs to be assessed.assessed.
Multi-channel Inversion algorithm is similar to LPRM Multi-channel Inversion algorithm is similar to LPRM algorithm when using the same Talgorithm when using the same Tss estimates. Thus, the estimates. Thus, the
tau-MPDI relationship may not be the key for the LPRM tau-MPDI relationship may not be the key for the LPRM success.success.