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Turbulent flux modelling with a simple 2-layer soil model and extrapolated surface temperature applied at Nam Co Lake basin on the Tibetan Plateau

Gerken, T. ; Babel, W. ; Hoffmann, A. ; Biermann, T. LU orcid ; Herzog, M. ; Friend, A. D. ; Li, M. ; Ma, Y. ; Foken, T. and Graf, H. F. (2012) In Hydrology and Earth System Sciences 16(4). p.1095-1110
Abstract

This paper introduces a surface model with two soil-layers for use in a high-resolution circulation model that has been modified with an extrapolated surface temperature, to be used for the calculation of turbulent fluxes. A quadratic temperature profile based on the layer mean and base temperature is assumed in each layer and extended to the surface. The model is tested at two sites on the Tibetan Plateau near Nam Co Lake during four days during the 2009 Monsoon season. In comparison to a two-layer model without explicit surface temperature estimate, there is a greatly reduced delay in diurnal flux cycles and the modelled surface temperature is much closer to observations. Comparison with a SVAT model and eddy covariance measurements... (More)

This paper introduces a surface model with two soil-layers for use in a high-resolution circulation model that has been modified with an extrapolated surface temperature, to be used for the calculation of turbulent fluxes. A quadratic temperature profile based on the layer mean and base temperature is assumed in each layer and extended to the surface. The model is tested at two sites on the Tibetan Plateau near Nam Co Lake during four days during the 2009 Monsoon season. In comparison to a two-layer model without explicit surface temperature estimate, there is a greatly reduced delay in diurnal flux cycles and the modelled surface temperature is much closer to observations. Comparison with a SVAT model and eddy covariance measurements shows an overall reasonable model performance based on RMSD and cross correlation comparisons between the modified and original model. A potential limitation of the model is the need for careful initialisation of the initial soil temperature profile, that requires field measurements. We show that the modified model is capable of reproducing fluxes of similar magnitudes and dynamics when compared to more complex methods chosen as a reference.

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author
; ; ; ; ; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
subject
in
Hydrology and Earth System Sciences
volume
16
issue
4
pages
16 pages
publisher
European Geophysical Society
external identifiers
  • scopus:84859336603
ISSN
1027-5606
DOI
10.5194/hess-16-1095-2012
language
English
LU publication?
no
id
0eb79d12-59bb-4994-8f86-76f3fb089c02
date added to LUP
2018-02-07 09:54:48
date last changed
2022-02-15 00:50:03
@article{0eb79d12-59bb-4994-8f86-76f3fb089c02,
  abstract     = {{<p>This paper introduces a surface model with two soil-layers for use in a high-resolution circulation model that has been modified with an extrapolated surface temperature, to be used for the calculation of turbulent fluxes. A quadratic temperature profile based on the layer mean and base temperature is assumed in each layer and extended to the surface. The model is tested at two sites on the Tibetan Plateau near Nam Co Lake during four days during the 2009 Monsoon season. In comparison to a two-layer model without explicit surface temperature estimate, there is a greatly reduced delay in diurnal flux cycles and the modelled surface temperature is much closer to observations. Comparison with a SVAT model and eddy covariance measurements shows an overall reasonable model performance based on RMSD and cross correlation comparisons between the modified and original model. A potential limitation of the model is the need for careful initialisation of the initial soil temperature profile, that requires field measurements. We show that the modified model is capable of reproducing fluxes of similar magnitudes and dynamics when compared to more complex methods chosen as a reference.</p>}},
  author       = {{Gerken, T. and Babel, W. and Hoffmann, A. and Biermann, T. and Herzog, M. and Friend, A. D. and Li, M. and Ma, Y. and Foken, T. and Graf, H. F.}},
  issn         = {{1027-5606}},
  language     = {{eng}},
  number       = {{4}},
  pages        = {{1095--1110}},
  publisher    = {{European Geophysical Society}},
  series       = {{Hydrology and Earth System Sciences}},
  title        = {{Turbulent flux modelling with a simple 2-layer soil model and extrapolated surface temperature applied at Nam Co Lake basin on the Tibetan Plateau}},
  url          = {{http://dx.doi.org/10.5194/hess-16-1095-2012}},
  doi          = {{10.5194/hess-16-1095-2012}},
  volume       = {{16}},
  year         = {{2012}},
}