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Estimation of Penetration Depth from Soil Effective Temperature in Microwave Radiometry
- Source :
- Remote sensing, 10(4):519, 1-19. MDPI, Remote Sensing; Volume 10; Issue 4; Pages: 519, Remote Sensing, Vol 10, Iss 4, p 519 (2018)
- Publication Year :
- 2018
-
Abstract
- Soil moisture is an essential variable in Earth surface modeling. Two dedicated satellite missions, the Soil Moisture and Ocean Salinity (SMOS) and the Soil Moisture Active Passive (SMAP), are currently in operation to map the global distribution of soil moisture. However, at the longer L-band wavelength of these satellites, the emitting behavior of the land becomes very complex due to the unknown deeper penetration depth. This complexity leads to more uncertainty in calibration and validation of satellite soil moisture product and their applications. In the framework of zeroth-order incoherent microwave radiative transfer model, the soil effective temperature is the only component that contains depth information and thus provides the necessary link to quantify the penetration depth. By means of the multi-layer soil effective temperature (Lv’s T e f f ) scheme, we have determined the relationship between the penetration depth and soil effective temperature and verified it against field observations at the Maqu Network. The key findings are that the penetration depth can be estimated according to Lv’s T e f f scheme with the assumption of linear soil temperature gradient along the optical depth; and conversely, the soil temperature at the penetration depth should be equal to the soil effective temperature with the same linear assumption. The accuracy of this inference depends on to what extent the assumption of linear soil temperature gradient is satisfied. The result of this study is expected to advance understanding of the soil moisture products retrieved by SMOS and SMAP and improve the techniques in data assimilation and climate research.
- Subjects :
- 010504 meteorology & atmospheric sciences
Science
0211 other engineering and technologies
Soil science
02 engineering and technology
01 natural sciences
Maqu network
Data assimilation
Atmospheric radiative transfer codes
soil effective temperature
microwave remote sensing
soil moisture
penetration depth
Penetration depth
Water content
Optical depth
021101 geological & geomatics engineering
0105 earth and related environmental sciences
Wavelength
ITC-ISI-JOURNAL-ARTICLE
General Earth and Planetary Sciences
Environmental science
Satellite
ITC-GOLD
Microwave
Subjects
Details
- Language :
- English
- ISSN :
- 20724292
- Database :
- OpenAIRE
- Journal :
- Remote sensing, 10(4):519, 1-19. MDPI, Remote Sensing; Volume 10; Issue 4; Pages: 519, Remote Sensing, Vol 10, Iss 4, p 519 (2018)
- Accession number :
- edsair.doi.dedup.....47c6e9d7e5cd0e80b504ea864bf87e93