Articles | Volume 13, issue 1
https://doi.org/10.5194/gi-13-51-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gi-13-51-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Ultra-low-cost manual soil respiration chamber
Bartosz M. Zawilski
CORRESPONDING AUTHOR
CESBIO Université de Toulouse, CNES, CNRS, INRA, IRD, UT3-Paul Sabatier, 31000 Toulouse, France
Vincent Bustillo
CESBIO Université de Toulouse, CNES, CNRS, INRA, IRD, UT3-Paul Sabatier, 31000 Toulouse, France
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Bartosz M. Zawilski, Franck Granouillac, Nicole Claverie, Baptiste Lemaire, Aurore Brut, and Tiphaine Tallec
Geosci. Instrum. Method. Data Syst., 12, 45–56, https://doi.org/10.5194/gi-12-45-2023, https://doi.org/10.5194/gi-12-45-2023, 2023
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In most cases, the soil water content (SWC) measurement is carried out using commercially available dielectric-permittivity-based probes such as time domain reflectometers or frequency domain reflectometers (FDR). However, these probes use transfer functions which may be inadequate in the soil concerned. Raw SWC measurement in clayey soil shows an important relative error. A simple protocol is presented, allowing for the recovery of an acceptable accuracy of the FDR SWC measurements.
Bartosz M. Zawilski
Geosci. Instrum. Method. Data Syst., 11, 223–234, https://doi.org/10.5194/gi-11-223-2022, https://doi.org/10.5194/gi-11-223-2022, 2022
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Surface energy balance (SEB) closure check and important environmental variable monitoring require soil heat flux measurement. On the one hand every experimental technique has its possible errors and needs to be checked and corrected. On the other hand, SEB equation should include all sensed energy sources and sinks.
Bartosz M. Zawilski
Geosci. Instrum. Method. Data Syst., 11, 163–182, https://doi.org/10.5194/gi-11-163-2022, https://doi.org/10.5194/gi-11-163-2022, 2022
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Soil evaporation is one of the most important water vapor sources on the Earth with multiple and severe consequences; however, there is a relative lack of instruments to measure it. This study describes a simple apparatus making the soil evaporation measurement accessible. The soil evaporation complexity is overcome by measuring the evaporation dynamic under different measurement conditions. A relatively simple measurement correction is then performed depending on the wind speed.
Bartosz M. Zawilski
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-43, https://doi.org/10.5194/bg-2020-43, 2020
Preprint withdrawn
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One of the most used techniques in order to assess the greenhouse gases flux is the Eddy Covariance (EC) technique that supposes the mean air vertical speed nullity. While working extensively with another technique used for soil effluxes measurements: dynamically closed chambers, it became obvious that there is a mass flow from the soil, it means that the vertical air speed can only be positive and caused by water evaporation. Based on vapor evaporation rate, EC corrections are very important.
Bartosz M. Zawilski, Franck Granouillac, Nicole Claverie, Baptiste Lemaire, Aurore Brut, and Tiphaine Tallec
Geosci. Instrum. Method. Data Syst., 12, 45–56, https://doi.org/10.5194/gi-12-45-2023, https://doi.org/10.5194/gi-12-45-2023, 2023
Short summary
Short summary
In most cases, the soil water content (SWC) measurement is carried out using commercially available dielectric-permittivity-based probes such as time domain reflectometers or frequency domain reflectometers (FDR). However, these probes use transfer functions which may be inadequate in the soil concerned. Raw SWC measurement in clayey soil shows an important relative error. A simple protocol is presented, allowing for the recovery of an acceptable accuracy of the FDR SWC measurements.
Bartosz M. Zawilski
Geosci. Instrum. Method. Data Syst., 11, 223–234, https://doi.org/10.5194/gi-11-223-2022, https://doi.org/10.5194/gi-11-223-2022, 2022
Short summary
Short summary
Surface energy balance (SEB) closure check and important environmental variable monitoring require soil heat flux measurement. On the one hand every experimental technique has its possible errors and needs to be checked and corrected. On the other hand, SEB equation should include all sensed energy sources and sinks.
Bartosz M. Zawilski
Geosci. Instrum. Method. Data Syst., 11, 163–182, https://doi.org/10.5194/gi-11-163-2022, https://doi.org/10.5194/gi-11-163-2022, 2022
Short summary
Short summary
Soil evaporation is one of the most important water vapor sources on the Earth with multiple and severe consequences; however, there is a relative lack of instruments to measure it. This study describes a simple apparatus making the soil evaporation measurement accessible. The soil evaporation complexity is overcome by measuring the evaporation dynamic under different measurement conditions. A relatively simple measurement correction is then performed depending on the wind speed.
Bartosz M. Zawilski
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-43, https://doi.org/10.5194/bg-2020-43, 2020
Preprint withdrawn
Short summary
Short summary
One of the most used techniques in order to assess the greenhouse gases flux is the Eddy Covariance (EC) technique that supposes the mean air vertical speed nullity. While working extensively with another technique used for soil effluxes measurements: dynamically closed chambers, it became obvious that there is a mass flow from the soil, it means that the vertical air speed can only be positive and caused by water evaporation. Based on vapor evaporation rate, EC corrections are very important.
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Robert Krüger, Pierre Karrasch, and Anette Eltner
Geosci. Instrum. Method. Data Syst., 13, 163–176, https://doi.org/10.5194/gi-13-163-2024, https://doi.org/10.5194/gi-13-163-2024, 2024
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Low-cost sensors could fill gaps in existing observation networks. To ensure data quality, the quality of the factory calibration of a given sensor has to be evaluated if the sensor is used out of the box. Here, the factory calibration of a widely used low-cost rain gauge type has been tested both in the lab (66) and in the field (20). The results of the study suggest that the calibration of this particular type should at least be checked for every sensor before being used.
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Heat storage in the soil is difficult to measure due to vertical heterogeneity. To improve measurements, we designed a 3D-printed probe that uses fiber-optic distributed temperature sensing to measure a vertical profile of soil temperature. We validated the temperature measurements against standard instrumentation. With the high-resolution data we were able to determine the thermal diffusivity of the soil at a resolution of 2.5 cm, which is much higher compared to traditional methods.
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Soil moisture monitoring is important for many applications, from improving weather prediction to supporting agriculture practices. Our capability to measure this variable is still, however, limited. In this study, we show the tests conducted on a new soil moisture sensor at several locations. The results show that the new sensor is a valid and compact alternative to more conventional, non-invasive soil moisture sensors that can pave the way for a wide range of applications.
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The expendable current profiler (XCP) is a single-use instrument that rapidly measures currents, including the velocity, flow direction, and temperature of seawater. This study improves upon the design of the XCP to reduce the cost of the single-use devices. This has been achieved by adopting signal modulation and demodulation to transmit analog signals on an enamelled wire and digitizing the signal above the surface of the water.
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Short summary
Manual chambers for soil respiration monitoring can be cost-effective yet rather accurate devices. The described chamber is relatively low in cost and entirely built from commercial parts, which makes it very accessible for almost everybody. Our chamber is robust, simple to operate, and very suitable for a large-scale punctual campaign and for educational purposes. Oxygen sensors bring some more insights into our soil respiration understanding.
Manual chambers for soil respiration monitoring can be cost-effective yet rather accurate...