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פותח על ידי קלירמאש פתרונות בע"מ -
Investigating temporal field sampling strategies for site-specific calibration of three soil moisture-neutron intensity parameterisation methods
Year:
2015
Authors :
איוומה, יוסט
;
.
Volume :
19
Co-Authors:
Iwema, J., Department of Civil Engineering, University of Bristol, Queen's Building, Bristol, United Kingdom
Rosolem, R., Department of Civil Engineering, University of Bristol, Queen's Building, Bristol, United Kingdom, Cabot Institute, University of Bristol, Bristol, United Kingdom
Baatz, R., Agrosphere (IBG-3), Forschungszentrum Jülich GmbH, Jülich, Germany
Wagener, T., Department of Civil Engineering, University of Bristol, Queen's Building, Bristol, United Kingdom, Cabot Institute, University of Bristol, Bristol, United Kingdom
Bogena, H.R., Agrosphere (IBG-3), Forschungszentrum Jülich GmbH, Jülich, Germany
Facilitators :
From page:
3203
To page:
3216
(
Total pages:
14
)
Abstract:
The Cosmic-Ray Neutron Sensor (CRNS) can provide soil moisture information at scales relevant to hydrometeorological modelling applications. Site-specific calibration is needed to translate CRNS neutron intensities into sensor footprint average soil moisture contents. We investigated temporal sampling strategies for calibration of three CRNS parameterisations (modified N0, HMF, and COSMIC) by assessing the effects of the number of sampling days and soil wetness conditions on the performance of the calibration results while investigating actual neutron intensity measurements, for three sites with distinct climate and land use: a semi-arid site, a temperate grassland, and a temperate forest. When calibrated with 1 year of data, both COSMIC and the modified N0 method performed better than HMF. The performance of COSMIC was remarkably good at the semi-arid site in the USA, while the N0mod performed best at the two temperate sites in Germany. The successful performance of COSMIC at all three sites can be attributed to the benefits of explicitly resolving individual soil layers (which is not accounted for in the other two parameterisations). To better calibrate these parameterisations, we recommend in situ soil sampled to be collected on more than a single day. However, little improvement is observed for sampling on more than 6 days. At the semi-arid site, the N0mod method was calibrated better under site-specific average wetness conditions, whereas HMF and COSMIC were calibrated better under drier conditions. Average soil wetness condition gave better calibration results at the two humid sites. The calibration results for the HMF method were better when calibrated with combinations of days with similar soil wetness conditions, opposed to N0mod and COSMIC, which profited from using days with distinct wetness conditions. Errors in actual neutron intensities were translated to average errors specifically to each site. At the semi-arid site, these errors were below the typical measurement uncertainties from in situ point-scale sensors and satellite remote sensing products. Nevertheless, at the two humid sites, reduction in uncertainty with increasing sampling days only reached typical errors associated with satellite remote sensing products. The outcomes of this study can be used by researchers as a CRNS calibration strategy guideline. © Author(s) 2015.
Note:
Related Files :
cosmic ray
Cosmic ray neutron
remote sensing
Satellite remote sensing
soil moisture
Soils
soil surveys
עוד תגיות
תוכן קשור
More details
DOI :
10.5194/hess-19-3203-2015
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
19226
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:27
Scientific Publication
Investigating temporal field sampling strategies for site-specific calibration of three soil moisture-neutron intensity parameterisation methods
19
Iwema, J., Department of Civil Engineering, University of Bristol, Queen's Building, Bristol, United Kingdom
Rosolem, R., Department of Civil Engineering, University of Bristol, Queen's Building, Bristol, United Kingdom, Cabot Institute, University of Bristol, Bristol, United Kingdom
Baatz, R., Agrosphere (IBG-3), Forschungszentrum Jülich GmbH, Jülich, Germany
Wagener, T., Department of Civil Engineering, University of Bristol, Queen's Building, Bristol, United Kingdom, Cabot Institute, University of Bristol, Bristol, United Kingdom
Bogena, H.R., Agrosphere (IBG-3), Forschungszentrum Jülich GmbH, Jülich, Germany
Investigating temporal field sampling strategies for site-specific calibration of three soil moisture-neutron intensity parameterisation methods
The Cosmic-Ray Neutron Sensor (CRNS) can provide soil moisture information at scales relevant to hydrometeorological modelling applications. Site-specific calibration is needed to translate CRNS neutron intensities into sensor footprint average soil moisture contents. We investigated temporal sampling strategies for calibration of three CRNS parameterisations (modified N0, HMF, and COSMIC) by assessing the effects of the number of sampling days and soil wetness conditions on the performance of the calibration results while investigating actual neutron intensity measurements, for three sites with distinct climate and land use: a semi-arid site, a temperate grassland, and a temperate forest. When calibrated with 1 year of data, both COSMIC and the modified N0 method performed better than HMF. The performance of COSMIC was remarkably good at the semi-arid site in the USA, while the N0mod performed best at the two temperate sites in Germany. The successful performance of COSMIC at all three sites can be attributed to the benefits of explicitly resolving individual soil layers (which is not accounted for in the other two parameterisations). To better calibrate these parameterisations, we recommend in situ soil sampled to be collected on more than a single day. However, little improvement is observed for sampling on more than 6 days. At the semi-arid site, the N0mod method was calibrated better under site-specific average wetness conditions, whereas HMF and COSMIC were calibrated better under drier conditions. Average soil wetness condition gave better calibration results at the two humid sites. The calibration results for the HMF method were better when calibrated with combinations of days with similar soil wetness conditions, opposed to N0mod and COSMIC, which profited from using days with distinct wetness conditions. Errors in actual neutron intensities were translated to average errors specifically to each site. At the semi-arid site, these errors were below the typical measurement uncertainties from in situ point-scale sensors and satellite remote sensing products. Nevertheless, at the two humid sites, reduction in uncertainty with increasing sampling days only reached typical errors associated with satellite remote sensing products. The outcomes of this study can be used by researchers as a CRNS calibration strategy guideline. © Author(s) 2015.
Scientific Publication
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