In Situ Estimates of Freezing/Melting Point Depression in Agricultural Soils Using Permittivity and Temperature Measurements

We present a method to characterize soil moisture freeze‐thaw events and freezing/melting point depression using permittivity and temperature measurements, readily available from in situ sources. In cold regions soil freeze‐thaw processes play a critical role in the surface energy and water balance,...

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Veröffentlicht in:Water resources research 2020-05, Vol.56 (5), p.n/a
Hauptverfasser: Pardo Lara, R., Berg, A. A., Warland, J., Tetlock, Erica
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creator Pardo Lara, R.
Berg, A. A.
Warland, J.
Tetlock, Erica
description We present a method to characterize soil moisture freeze‐thaw events and freezing/melting point depression using permittivity and temperature measurements, readily available from in situ sources. In cold regions soil freeze‐thaw processes play a critical role in the surface energy and water balance, with implications ranging from agricultural yields to natural disasters. Although monitoring of the soil moisture phase state is of critical importance, there is an inability to interpret soil moisture instrumentation in frozen conditions. To address this gap, we investigated the freeze‐thaw response of a widely used soil moisture probe, the HydraProbe, in the laboratory. Soil freezing curves (SFCs) and soil thawing curves (STCs) were identified using the relationship between soil permittivity and temperature. The permittivity SFC/STC was fit using a logistic growth model to estimate the freezing/melting point depression (Tf/m) and its spread (s). Laboratory results showed that the fitting routine requires permittivity changes greater than 3.8 to provide robust estimates and suggested that a temperature bias is inherent in horizontally placed HydraProbes. We tested the method using field measurements collected over the last 7 years from the Environment and Climate Change Canada and the University of Guelph's Kenaston Soil Moisture Network in Saskatchewan, Canada. By dividing the time series into freeze‐thaw events and then into individual transitions, the permittivity SFC/STC was identified. The freezing and melting point depression for the network was estimated as Tf/m = − 0.35 ± 0.2,with Tf = − 0.41 ± 0.22 °C and Tm = − 0.29 ± 0.16 °C, respectively. Key Points The freeze‐thaw response of a widely used soil moisture probe was investigated, and permittivity soil freezing/thawing curves were identified A logistic growth model was fitted to the permittivity soil freezing/thawing curves yielding freezing/melting point depression estimates In situ estimates of the freezing/melting point depression and frozen water saturation provided for the Kenaston Soil Moisture Network
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A. ; Warland, J. ; Tetlock, Erica</creator><creatorcontrib>Pardo Lara, R. ; Berg, A. A. ; Warland, J. ; Tetlock, Erica</creatorcontrib><description>We present a method to characterize soil moisture freeze‐thaw events and freezing/melting point depression using permittivity and temperature measurements, readily available from in situ sources. In cold regions soil freeze‐thaw processes play a critical role in the surface energy and water balance, with implications ranging from agricultural yields to natural disasters. Although monitoring of the soil moisture phase state is of critical importance, there is an inability to interpret soil moisture instrumentation in frozen conditions. To address this gap, we investigated the freeze‐thaw response of a widely used soil moisture probe, the HydraProbe, in the laboratory. Soil freezing curves (SFCs) and soil thawing curves (STCs) were identified using the relationship between soil permittivity and temperature. The permittivity SFC/STC was fit using a logistic growth model to estimate the freezing/melting point depression (Tf/m) and its spread (s). Laboratory results showed that the fitting routine requires permittivity changes greater than 3.8 to provide robust estimates and suggested that a temperature bias is inherent in horizontally placed HydraProbes. We tested the method using field measurements collected over the last 7 years from the Environment and Climate Change Canada and the University of Guelph's Kenaston Soil Moisture Network in Saskatchewan, Canada. By dividing the time series into freeze‐thaw events and then into individual transitions, the permittivity SFC/STC was identified. The freezing and melting point depression for the network was estimated as Tf/m = − 0.35 ± 0.2,with Tf = − 0.41 ± 0.22 °C and Tm = − 0.29 ± 0.16 °C, respectively. Key Points The freeze‐thaw response of a widely used soil moisture probe was investigated, and permittivity soil freezing/thawing curves were identified A logistic growth model was fitted to the permittivity soil freezing/thawing curves yielding freezing/melting point depression estimates In situ estimates of the freezing/melting point depression and frozen water saturation provided for the Kenaston Soil Moisture Network</description><identifier>ISSN: 0043-1397</identifier><identifier>EISSN: 1944-7973</identifier><identifier>DOI: 10.1029/2019WR026020</identifier><language>eng</language><publisher>Washington: John Wiley &amp; Sons, Inc</publisher><subject>Agricultural land ; Climate change ; Cold regions ; cryosphere ; Disasters ; Environmental monitoring ; freeze thaw ; Freeze-thawing ; Freezing ; Freezing point ; freezing point depression ; Frozen ground ; Growth models ; Identification ; Instrumentation ; Laboratories ; Melting ; Melting point ; Melting points ; Moisture probe ; Natural disasters ; Permittivity ; seasonally frozen ground ; Soil ; Soil freezing ; soil freezing curve ; Soil investigations ; Soil moisture ; Soil temperature ; Soils ; Surface energy ; Surface properties ; Temperature measurement ; Thawing ; Water balance</subject><ispartof>Water resources research, 2020-05, Vol.56 (5), p.n/a</ispartof><rights>2020. 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A.</creatorcontrib><creatorcontrib>Warland, J.</creatorcontrib><creatorcontrib>Tetlock, Erica</creatorcontrib><title>In Situ Estimates of Freezing/Melting Point Depression in Agricultural Soils Using Permittivity and Temperature Measurements</title><title>Water resources research</title><description>We present a method to characterize soil moisture freeze‐thaw events and freezing/melting point depression using permittivity and temperature measurements, readily available from in situ sources. In cold regions soil freeze‐thaw processes play a critical role in the surface energy and water balance, with implications ranging from agricultural yields to natural disasters. Although monitoring of the soil moisture phase state is of critical importance, there is an inability to interpret soil moisture instrumentation in frozen conditions. To address this gap, we investigated the freeze‐thaw response of a widely used soil moisture probe, the HydraProbe, in the laboratory. Soil freezing curves (SFCs) and soil thawing curves (STCs) were identified using the relationship between soil permittivity and temperature. The permittivity SFC/STC was fit using a logistic growth model to estimate the freezing/melting point depression (Tf/m) and its spread (s). Laboratory results showed that the fitting routine requires permittivity changes greater than 3.8 to provide robust estimates and suggested that a temperature bias is inherent in horizontally placed HydraProbes. We tested the method using field measurements collected over the last 7 years from the Environment and Climate Change Canada and the University of Guelph's Kenaston Soil Moisture Network in Saskatchewan, Canada. By dividing the time series into freeze‐thaw events and then into individual transitions, the permittivity SFC/STC was identified. The freezing and melting point depression for the network was estimated as Tf/m = − 0.35 ± 0.2,with Tf = − 0.41 ± 0.22 °C and Tm = − 0.29 ± 0.16 °C, respectively. Key Points The freeze‐thaw response of a widely used soil moisture probe was investigated, and permittivity soil freezing/thawing curves were identified A logistic growth model was fitted to the permittivity soil freezing/thawing curves yielding freezing/melting point depression estimates In situ estimates of the freezing/melting point depression and frozen water saturation provided for the Kenaston Soil Moisture Network</description><subject>Agricultural land</subject><subject>Climate change</subject><subject>Cold regions</subject><subject>cryosphere</subject><subject>Disasters</subject><subject>Environmental monitoring</subject><subject>freeze thaw</subject><subject>Freeze-thawing</subject><subject>Freezing</subject><subject>Freezing point</subject><subject>freezing point depression</subject><subject>Frozen ground</subject><subject>Growth models</subject><subject>Identification</subject><subject>Instrumentation</subject><subject>Laboratories</subject><subject>Melting</subject><subject>Melting point</subject><subject>Melting points</subject><subject>Moisture probe</subject><subject>Natural disasters</subject><subject>Permittivity</subject><subject>seasonally frozen ground</subject><subject>Soil</subject><subject>Soil freezing</subject><subject>soil freezing curve</subject><subject>Soil investigations</subject><subject>Soil moisture</subject><subject>Soil temperature</subject><subject>Soils</subject><subject>Surface energy</subject><subject>Surface properties</subject><subject>Temperature measurement</subject><subject>Thawing</subject><subject>Water balance</subject><issn>0043-1397</issn><issn>1944-7973</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp9kEtLAzEURoMoWKs7f0DArWPzmkeWpVottCh90OUwnd6UlJnMmGSUij_eaF24cnU2534XDkLXlNxRwuSAESrXc8ISwsgJ6lEpRJTKlJ-iHiGCR5TL9BxdOLcnhIo4SXvoc2LwQvsOPziv68KDw43CYwvwoc1uMIPKB-KXRhuP76G14JxuDNYGD3dWl13lO1tUeNHoyuGV-5HB1tp7_ab9ARdmi5dQt2CLYAKeQeECazDeXaIzVVQOrn7ZR6vxw3L0FE2fHyej4TQqOCdZFAtJiNpslEqEZCSRaptxUcpUZVSWnIotjUFlstyQVEA4SeNYJCxLGBQKypL30c1xt7XNawfO5_umsya8zJkIeyzhkgbr9miVtnHOgspbG5LYQ05J_t03_9s36Pyov-sKDv-6-Xo-mrMQPONfmpJ9ng</recordid><startdate>202005</startdate><enddate>202005</enddate><creator>Pardo Lara, R.</creator><creator>Berg, A. 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subjects Agricultural land
Climate change
Cold regions
cryosphere
Disasters
Environmental monitoring
freeze thaw
Freeze-thawing
Freezing
Freezing point
freezing point depression
Frozen ground
Growth models
Identification
Instrumentation
Laboratories
Melting
Melting point
Melting points
Moisture probe
Natural disasters
Permittivity
seasonally frozen ground
Soil
Soil freezing
soil freezing curve
Soil investigations
Soil moisture
Soil temperature
Soils
Surface energy
Surface properties
Temperature measurement
Thawing
Water balance
title In Situ Estimates of Freezing/Melting Point Depression in Agricultural Soils Using Permittivity and Temperature Measurements
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