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Sensitivity Analysis of b-factor in Microwave Emission Model for Soil Moisture Retrieval: A Case Study for SMAP Mission (2010)
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BibTeX
@MISC{Seo10sensitivityanalysis,
author = {Dugwon Seo and Tarendra Lakhankar and Reza Khanbilvardi},
title = {Sensitivity Analysis of b-factor in Microwave Emission Model for Soil Moisture Retrieval: A Case Study for SMAP Mission},
year = {2010}
}
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Abstract
Abstract: Sensitivity analysis is critically needed to better understand the microwave emission model for soil moisture retrieval using passive microwave remote sensing data. The vegetation b-factor along with vegetation water content and surface characteristics has significant impact in model prediction. This study evaluates the sensitivity of the b-factor, which is function of vegetation type. The analysis is carried out using Passive and Active L and S-band airborne sensor (PALS) and measured field soil moisture from Southern Great Plains experiment (SGP99). The results show that the relative sensitivity of the b-factor is 86 % in wet soil condition and 88 % in high vegetated condition compared to the sensitivity of the soil moisture. Apparently, the b-factor is found to be more sensitive than the vegetation water content, surface roughness and surface temperature; therefore, the effect of the b-factor is fairly large to the microwave emission in certain conditions. Understanding the dependence of the b-factor on the soil and vegetation is important in studying the soil moisture retrieval algorithm, which can lead to potential improvements in model development for the Soil Moisture Active-Passive (SMAP) mission.
Keyphrases
sensitivity analysis soil moisture retrieval microwave emission model case study smap mission vegetation water content model prediction s-band airborne sensor passive microwave remote surface roughness model development field soil moisture potential improvement certain condition southern great plain experiment vegetation b-factor significant impact relative sensitivity microwave emission surface characteristic soil moisture active-passive soil moisture retrieval algorithm surface temperature wet soil condition soil moisture vegetation type
