Universität zu Köln

Schwinger, Joerg, Kollet, Stefan J., Hoppe, Charlotte M. and Elbern, Hendrik ORCID: 0000-0002-5746-4506 (2010). Sensitivity of Latent Heat Fluxes to Initial Values and Parameters of a Land-Surface Model. Vadose Zone J., 9 (4). S. 984 - 1002. MADISON: SOIL SCI SOC AMER. ISSN 1539-1663

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Abstract

A tangent linear version of the complex soil-vegetation-atmosphere transfer model Community Land Model has been developed and its ability to reproduce relevant sensitivities of the modeled soil moisture and latent heat flux (LE) evolution to a number of different parameters on a short time scale (3 d) was analyzed. To this end, a series of idealized experiments for different soil moisture states and three different soil types was conducted. We found that the tangent linear model performs well for a large range of conditions. Situations in which the linear approximation potentially fails were connected with the occurrence of saturation and with the highly nonlinear parameterization of water availability to plants. The sensitivity of LE with respect to the model's initial soil moisture state was calculated and compared with the LE sensitivity to soil texture, leaf area index (LAI), and vegetation roughness length. These sensitivities were found to be highly variable with soil type and soil moisture. Our results confirm that soil texture and LAI are key parameters that have a dominant influence on modeled LE under specific environmental conditions. As a preparatory study to soil data assimilation developments, the results also serve to quantify model uncertainties due to limited knowledge of forcing processes and model parameters.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schwinger, Joerg UNSPECIFIED UNSPECIFIED UNSPECIFIED Kollet, Stefan J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hoppe, Charlotte M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Elbern, Hendrik UNSPECIFIED orcid.org/0000-0002-5746-4506 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-492751
DOI:	10.2136/vzj2009.0190
Journal or Publication Title:	Vadose Zone J.
Volume:	9
Number:	4
Page Range:	S. 984 - 1002
Date:	2010
Publisher:	SOIL SCI SOC AMER
Place of Publication:	MADISON
ISSN:	1539-1663
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SCREEN-LEVEL OBSERVATIONS; SOIL-MOISTURE; DATA ASSIMILATION; VARIATIONAL ANALYSIS; PART I; SCHEME; INCLUSION; 4D-VAR; ENERGY; BATS Multiple languages Environmental Sciences; Soil Science; Water Resources Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/49275