Comparison of two soil temperature algorithms for a bare ground site on the Loess Plateau in China

dc.contributor.author Gao, Zhiqiu
dc.contributor.author Lenschow, Donald
dc.contributor.author Horton, Robert
dc.contributor.author Horton, Robert
dc.contributor.author Zhou, Mingyu
dc.contributor.author Wang, Linlin
dc.contributor.author Wen, Jun
dc.contributor.department Agronomy
dc.date 2018-01-25T07:46:56.000
dc.date.accessioned 2020-06-29T23:04:46Z
dc.date.available 2020-06-29T23:04:46Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2008
dc.date.issued 2008-01-01
dc.description.abstract <p>Two thermal transfer algorithms for soil are used to investigate the diurnal vertical temperature variation in the common case of a vertically heterogeneous thermal diffusivity and the considerable liquid water flux which generally exists in soil when surface evaporation is large. One algorithm assumes that soil is vertically homogenous and takes into account only thermal conduction, and the other, developed in our recent study, considers the vertical heterogeneity of thermal diffusivity in soil and couples thermal conduction and convection (e.g., heat transfer by water flux). Theoretically the two methods are identical for vertically homogenous dry soil. On the basis of soil temperature data collected at a bare soil site over the Loess Plateau of China during the period from DOYs 197 to 241, 2005, we found that the new algorithm gives a realistic estimate of soil temperature while the previous one, on average, overestimates either the diurnal amplitude by 0.95 K or the phase shift by 0.207 rad (i.e., 47.44 min) at the soil depth of 0.10 m. Using the new algorithm and measurements of soil temperature, we determine the soil thermal diffusivity and a variable that represents the sum of the vertical gradient of soil thermal diffusivity and water flux density at three levels within the first 0.40 m of the soil surface. We also simulate the soil temperature for the depths of 0.20 m and 0.40 m, and the results are in satisfactory agreement with direct measurements. The main contribution here is to provide analytic insight into the role of heterogeneity and some simple formulae as tools for interpretation of the role of heterogeneity in observed diurnal temperature variations.</p>
dc.description.comments <p>This article is published as Gao, Zhiqiu, Donald H. Lenschow, Robert Horton, Mingyu Zhou, Linlin Wang, and Jun Wen. "Comparison of two soil temperature algorithms for a bare ground site on the Loess Plateau in China." Journal of Geophysical Research 113, D18105 (2008). doi: <a href="http://dx.doi.org/10.1029" target="_blank">10.1029/2008JD010285</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_pubs/383/
dc.identifier.articleid 1430
dc.identifier.contextkey 11408350
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/383
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/4735
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_pubs/383/2008_Horton_ComparisonTwo.pdf|||Fri Jan 14 23:53:17 UTC 2022
dc.source.uri 10.1029/2008JD010285
dc.subject.disciplines Agriculture
dc.subject.disciplines Geophysics and Seismology
dc.subject.disciplines Hydrology
dc.subject.disciplines Soil Science
dc.title Comparison of two soil temperature algorithms for a bare ground site on the Loess Plateau in China
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication d3fb0917-6868-417e-9695-a010896cfafa
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
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