The influence of rain sensible heat, subsurface heat convection and the lower temperature boundary condition on the energy balance at the land surface

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*Title:*	Main Title: The influence of rain sensible heat, subsurface heat convection and the lower temperature boundary condition on the energy balance at the land surface
*Description:*	Abstract: In land surface models, which account for the energy balance at the land surface, subsurface heat transport is an important component that reciprocally influences ground, sensible, and latent heat fluxes and net radiation. In most models, subsurface heat transport parameterizations are commonly simplified for computational efficiency. A simplification made in all models is to disregard the sensible heat of rain, H l, and convective subsurface heat flow, q cv, i.e., the convective transport of heat through moisture redistribution. These simplifications act to decouple heat transport from moisture transport at the land surface and in the subsurface, which is not realistic. The influence of H l and q cv on the energy balance was studied using a coupled model that integrates a subsurface moisture and energy transport model with a land surface model of the land surface energy balance, showing that all components of the land surface energy balance depend on H l The strength of the dependence is related to the rainfall rate and the temperature difference between the rain water and the soil surface. The rain water temperature is a parameter rarely measured in the field that introduces uncertainty in the calculations and was approximated using the either air or wet bulb temperatures in different simulations. In addition, it was shown that the lower boundary condition for closing the problem of subsurface heat transport, including convection, has strong implications on the energy balance under dynamic equilibrium conditions. Comparison with measured data from the Meteostation Haarweg, Wageningen, the Netherlands, shows good agreement and further underscores the importance of a more tightly coupled subsurface hydrology–energy balance formulation in land surface models.
*Identifier:*	10.2136/vzj2009.0005 (DOI)

Responsible Party

*Creators:*	Stefan Kollet (Author), Ivana Cvijanovic (Author), Dirk Schüttemeyer (Author), Reed M. Maxwell (Author), Arnold F. Moene (Author), Peter Bayer (Author)
*Publisher:*	Soil Science Society of America
*Publication Year:*	2013

Topic

*TR32 Topic:*	Atmosphere
*Related Subproject:*	D8
*Subjects:*	Keywords: Subsurface Flow, Heat Transport, LSM

File Details

*Filename:*	2009_Kollet_VZJ.pdf
*Data Type:*	Text - Article
*Size:*	12 Pages
*File Size:*	1.6 MB
*Date:*	Issued: 09.10.2010
*Mime Type:*	application/pdf
*Data Format:*	PDF
*Language:*	English
*Status:*	Completed

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*Download Permission:*	Only Project Members
*General Access and Use Conditions:*	For internal use only
*Access Limitations:*	For internal use only
*Licence:*	[TR32DB] Data policy agreement

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*Publication Status:*	Published
*Review Status:*	Peer reviewed
*Publication Type:*	Article
*Article Type:*	Journal
*Source:*	Vadose Zone Journal
*Source Website:*	www.soils.org
*Issue:*	4
*Volume:*	8
*Number of Pages:*	12 (846 - 857)

Metadata Details

*Metadata Creator:*	Stefan Kollet
*Metadata Created:*	05.12.2013
*Metadata Last Updated:*	05.12.2013
*Subproject:*	D8
*Funding Phase:*	2
*Metadata Language:*	English
*Metadata Version:*	V50

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