研究目的
Investigating the global soil freeze/thaw detection algorithm using passive L-band microwave observations from the European Space Agency’s Soil Moisture and Ocean Salinity (SMOS) mission and its applications in carbon and climate models, soil carrying capacity analysis, and hydrological models.
研究成果
The demonstrator version of the SMOS F/T product has been published, covering the period from June 2010 to March 2017. The next step is to provide an operational product, updated in a daily basis with 1-day latency.
研究不足
The current version of the SMOS based F/T product has a temporal coverage from June 2010 to December 2017. An operational version of the product is under development.
1：Experimental Design and Method Selection:
The soil freeze/thaw (F/T) detection method is based on using SMOS satellite data, employing a threshold detection approach by comparing each observation to empirically predefined frozen and thawed ground references.
2：Sample Selection and Data Sources:
Uses daily gridded SMOS brightness temperature datasets provided by Centre Aval de Traitement des Données SMOS (CATDS).
3：List of Experimental Equipment and Materials:
SMOS satellite's MIRAS (Microwave Imaging with Aperture Synthesis) instrument.
4：Experimental Procedures and Operational Workflow:
The detection algorithm uses air temperature and snow cover ancillary data to regulate the detection in two phases.
5：Data Analysis Methods:
The output product categorizes soil state as frozen, partially frozen, or thawed.
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