Soil dielectric characterization during freeze–thaw transitions using L-band coaxial and soil moisture probes
نویسندگان
چکیده
Abstract. Soil microwave permittivity is a crucial parameter in passive retrieval algorithms but remains challenging variable to measure. To validate and improve satellite data products, precise reliable estimations of the relative (?r=?/?0=??-j???; unitless) soils are required, particularly for frozen soils. In this study, measurements were acquired using two different instruments: newly designed open-ended coaxial probe (OECP) conventional Stevens HydraProbe. Both instruments used characterize soil samples undergoing several freeze–thaw cycles laboratory environment. The compared models. OECP measured (?frozen?=[3.5; 6.0], ?frozen??=[0.46; 1.2]) thawed (?thawed?=[6.5; 22.8], ?thawed??=[1.43; 5.7]) permittivity. We also demonstrate that cheaper widespread probes operating at lower frequencies (i.e., HydraProbe) can be estimate given proper calibration an L-band (1–2 GHz) probe. This study highlighted need dielectric models, during transitions. There still important discrepancies between situ modeled estimates no current model accounts hysteresis effect shown freezing thawing processes, which could have significant impact on detection from satellites.
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ژورنال
عنوان ژورنال: Hydrology and Earth System Sciences
سال: 2021
ISSN: ['1607-7938', '1027-5606']
DOI: https://doi.org/10.5194/hess-25-1117-2021