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Title: A novel approach to evaluate soil heat flux calculation: An analytical review of nine methods

Abstract

Abstract There are no direct methods to evaluate calculated soil heat flux (SHF) at the surface ( G 0 ). Instead, validation and cross evaluation of methods for calculating G 0 usually rely on the conventional calorimetric method or the degree of the surface energy balance closure. However, there is uncertainty in the calorimetric method itself, and factors apart from G 0 also contribute to nonclosure of the surface energy balance. Here we used a novel approach to evaluate nine different methods for calculating SHF, including the calorimetric method and methods based on analytical solutions of the heat diffusion equation. The SHF ( G z ) measured by a self‐calibrating SHF plate at a depth of z  = 5 cm below the surface (hereafter G m _5 cm ) was deployed as a reference. Each SHF calculation method was assessed by comparing the calculated G z at the same depth (hereafter G c _5 cm ) with G m _5 cm . The calorimetric method and simple measurement method performed best in determining G c _5 cm but still underestimated G m _5 cm by 19% during themore » daytime. Possible causes for this underestimation include errors and uncertainties in SHF measurements and soil thermal properties, as well as the phase lag between G c _5 cm and G m _5 cm . Our results indicate that the calorimetric method achieves the most accurate SHF estimates if self‐calibrating SHF plates are deployed at two depths (e.g., 5 cm and 10 cm), soil temperature and water content measurements are made in a few depths between the two plates, and soil thermal properties are accurately quantified.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2];  [2];  [2];  [2];  [1]; ORCiD logo [1]
  1. Laboratory for Atmospheric Research, Department of Civil and Environmental Engineering Washington State University Pullman Washington USA
  2. Pacific Northwest National Laboratory Richland Washington USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1402336
Grant/Contract Number:  
DE‐AC05‐76RLO1830
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Journal of Geophysical Research: Atmospheres
Additional Journal Information:
Journal Name: Journal of Geophysical Research: Atmospheres Journal Volume: 122 Journal Issue: 13; Journal ID: ISSN 2169-897X
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English

Citation Formats

Gao, Zhongming, Russell, Eric S., Missik, Justine E. C., Huang, Maoyi, Chen, Xingyuan, Strickland, Chris E., Clayton, Ray, Arntzen, Evan, Ma, Yulong, and Liu, Heping. A novel approach to evaluate soil heat flux calculation: An analytical review of nine methods. United States: N. p., 2017. Web. doi:10.1002/2017JD027160.
Gao, Zhongming, Russell, Eric S., Missik, Justine E. C., Huang, Maoyi, Chen, Xingyuan, Strickland, Chris E., Clayton, Ray, Arntzen, Evan, Ma, Yulong, & Liu, Heping. A novel approach to evaluate soil heat flux calculation: An analytical review of nine methods. United States. https://doi.org/10.1002/2017JD027160
Gao, Zhongming, Russell, Eric S., Missik, Justine E. C., Huang, Maoyi, Chen, Xingyuan, Strickland, Chris E., Clayton, Ray, Arntzen, Evan, Ma, Yulong, and Liu, Heping. Wed . "A novel approach to evaluate soil heat flux calculation: An analytical review of nine methods". United States. https://doi.org/10.1002/2017JD027160.
@article{osti_1402336,
title = {A novel approach to evaluate soil heat flux calculation: An analytical review of nine methods},
author = {Gao, Zhongming and Russell, Eric S. and Missik, Justine E. C. and Huang, Maoyi and Chen, Xingyuan and Strickland, Chris E. and Clayton, Ray and Arntzen, Evan and Ma, Yulong and Liu, Heping},
abstractNote = {Abstract There are no direct methods to evaluate calculated soil heat flux (SHF) at the surface ( G 0 ). Instead, validation and cross evaluation of methods for calculating G 0 usually rely on the conventional calorimetric method or the degree of the surface energy balance closure. However, there is uncertainty in the calorimetric method itself, and factors apart from G 0 also contribute to nonclosure of the surface energy balance. Here we used a novel approach to evaluate nine different methods for calculating SHF, including the calorimetric method and methods based on analytical solutions of the heat diffusion equation. The SHF ( G z ) measured by a self‐calibrating SHF plate at a depth of z  = 5 cm below the surface (hereafter G m _5 cm ) was deployed as a reference. Each SHF calculation method was assessed by comparing the calculated G z at the same depth (hereafter G c _5 cm ) with G m _5 cm . The calorimetric method and simple measurement method performed best in determining G c _5 cm but still underestimated G m _5 cm by 19% during the daytime. Possible causes for this underestimation include errors and uncertainties in SHF measurements and soil thermal properties, as well as the phase lag between G c _5 cm and G m _5 cm . Our results indicate that the calorimetric method achieves the most accurate SHF estimates if self‐calibrating SHF plates are deployed at two depths (e.g., 5 cm and 10 cm), soil temperature and water content measurements are made in a few depths between the two plates, and soil thermal properties are accurately quantified.},
doi = {10.1002/2017JD027160},
journal = {Journal of Geophysical Research: Atmospheres},
number = 13,
volume = 122,
place = {United States},
year = {Wed Jul 12 00:00:00 EDT 2017},
month = {Wed Jul 12 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.1002/2017JD027160

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