Impact of the Soil Moisture Distribution in the Top Layer on the Accuracy Moisture Retrieval by Microwave Radiometer Data
| Autor: | P. P. Bobrov, Alexandr S. Yashchenko |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
L band
010504 meteorology & atmospheric sciences Moisture Microwave radiometer 0211 other engineering and technologies Soil science Global change 02 engineering and technology 01 natural sciences Salinity Satellite data General Earth and Planetary Sciences Environmental science Electrical and Electronic Engineering Water content Layer (electronics) 021101 geological & geomatics engineering 0105 earth and related environmental sciences Remote sensing |
| Zdroj: | IEEE Transactions on Geoscience and Remote Sensing. 54:5239-5246 |
| ISSN: | 1558-0644 0196-2892 |
| DOI: | 10.1109/tgrs.2016.2559162 |
| Popis: | This paper investigates the impact of the soil moisture distribution in the top layer on the accuracy of soil moisture retrieval by microwave remote sensing methods. We modeled soil emission at L-band by coherent and noncoherent models for the different moisture distributions in the top layer. As a result, it is found that, at high moisture gradients, the difference between average moisture within the sensing depth at L-band and the moisture retrievable from remote sensing data can be more than 20% in absolute terms. In addition, high differences between Soil Moisture and Ocean Salinity (SMOS) Level 2 data and the in situ measurements were revealed in cases of high gradients. Such high gradients may be observed during some time in the top layer of the drying soil after rainfall. These differences are significantly more than the accuracy declared by SMOS development team. We proposed a simple method that allows the assessment of the type of soil moisture profile by SMOS and Global Change Observation Mission‐Water “SHIZUKU” (GCOM-W1) satellites data. The procedure for simple processing of data of the two satellites is described. In addition, we compared the type of soil moisture profile retrieved from satellite data and the soil moisture profile found by in situ measurements. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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