[722] - 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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Kollet, S., Cvijanovic, I., Schüttemeyer, D., Maxwell, R. M., Moene, A. F., Bayer, P., 2009. The influence of rain sensible heat, subsurface heat convection and the lower temperature boundary condition on the energy balance at the land surface. Vadose Zone Journal, 8 (4), 846 - 857. DOI: 10.2136/vzj2009.0005.
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Title(s):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(s):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(s):DOI: 10.2136/vzj2009.0005
Responsible Party
Creator(s):Author: Stefan Kollet
Author: Ivana Cvijanovic
Author: Dirk Schüttemeyer
Author: Reed M. Maxwell
Author: Arnold F. Moene
Author: Peter Bayer
Publisher:Soil Science Society of America
TR32 Topic:Atmosphere
Subject(s):CRC/TR32 Keywords: Subsurface Flow, Heat Transport, LSM
File Details
File Name:2009_Kollet_VZJ.pdf
Data Type:Text
Size(s):12 Pages
File Size:1635 kB (1.597 MB)
Date(s):Issued: 2010-10-09
Mime Type:application/pdf
Data Format:PDF
Download Permission:OnlyTR32
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:TR32DB Data policy agreement
North:-no map data
Measurement Region:TheNetherlands
Measurement Location:--TheNetherlands--
Specific Informations - Publication
Article Type:Journal
Source:Vadose Zone Journal
Number Of Pages:12
Page Range:846 - 857
Metadata Details
Metadata Creator:Stefan Kollet
Metadata Created:2013-12-05
Metadata Last Updated:2013-12-05
Funding Phase:2
Metadata Language:English
Metadata Version:V40
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