Sensible heat measurements indicating depth and magnitude of subsurface soil water evaporation

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dc.contributor.author Heitman, J.
dc.contributor.author Xiao, X.
dc.contributor.author Horton, Robert
dc.contributor.author Horton, R.
dc.contributor.author Sauer, T. J.
dc.contributor.department Agronomy
dc.date 2018-01-25T07:46:49.000
dc.date.accessioned 2020-06-29T23:04:45Z
dc.date.available 2020-06-29T23:04:45Z
dc.date.issued 2008-04-01
dc.description.abstract <p>Most measurement approaches for determining evaporation assume that the latent heat flux originates from the soil surface. Here, a new method is described for determining in situ soil water evaporation dynamics from fine-scale measurements of soil temperature and thermal properties with heat pulse sensors. A sensible heat balance is computed using soil heat flux density at two depths and change in sensible heat storage in between; the sensible heat balance residual is attributed to latent heat from evaporation of soil water. Comparisons between near-surface soil heat flux density and Bowen ratio energy balance measurements suggest that evaporation originates below the soil surface several days after rainfall. The sensible heat balance accounts for this evaporation dynamic in millimeter-scale depth increments within the soil. Comparisons of sensible heat balance daily evaporation estimates to Bowen ratio and mass balance estimates indicate strong agreement (<em>r</em><sup>2</sup> = 0.96, root-mean-square error = 0.20 mm). Potential applications of this technique include location of the depth and magnitude of subsurface evaporation fluxes and estimation of stage 2–3 daily evaporation without requirements for large fetch. These applications represent new contributions to vadose zone hydrology.</p>
dc.description.comments <p>This article is published as Heitman, J. L., Xinhua Xiao, Robert Horton, and T. J. Sauer. "Sensible heat measurements indicating depth and magnitude of subsurface soil water evaporation." Water resources research 44, no. 4 (2008). doi: <a href="http://dx.doi.org/10.1029/2008WR006961" target="_blank" title="Sensible heat measurements indicating depth and magnitude of subsurface soil water evaporation">10.1029/2008WR006961</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_pubs/382/
dc.identifier.articleid 1429
dc.identifier.contextkey 11406998
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/382
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/4734
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_pubs/382/2008_Horton_SensibleHeatMeasurements.pdf|||Fri Jan 14 23:53:08 UTC 2022
dc.source.uri 10.1029/2008WR006961
dc.subject.disciplines Agriculture
dc.subject.disciplines Hydrology
dc.subject.disciplines Research Methods in Life Sciences
dc.subject.disciplines Soil Science
dc.title Sensible heat measurements indicating depth and magnitude of subsurface soil water evaporation
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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