TR32-Database: Database of Transregio 32

[1043] - Intercomparison of methods for the simultaneous estimation of zero-plane displacement and aerodynamic roughness length from single-level eddy-covariance data

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Features
Citation
Graf, A., van de Boer, A., Moene, A. F., Vereecken, H., 2014. Intercomparison of methods for the simultaneous estimation of zero-plane displacement and aerodynamic roughness length from single-level eddy-covariance data. Boundary-Layer Meteorology, 151, 373 - 387. DOI: 10.1007/s10546-013-9905-z.
Identification
Title(s):Main Title: Intercomparison of methods for the simultaneous estimation of zero-plane displacement and aerodynamic roughness length from single-level eddy-covariance data
Description(s):Abstract: We applied three approaches to estimate the zero-plane displacement d through the aerodynamic measurement height z (with z = zm − d and zm being the measurement height above the surface), and the aerodynamic roughness length z0, from single-level eddy covariance data. Two approaches (one iterative and one regression-based) were based on the universal function in the logarithmic wind profile and yielded an inherently simultaneous estimation of both d and z0. The third approach was based on flux–variance similarity, where estimation of d and consecutive estimation of z0 are independent steps. Each approach was further divided into two methods differing either with respect to the solution technique (profile approaches) or with respect to the variable (variance of vertical wind and temperature, respectively). All methods were applied to measurements above a large, growing wheat field where a uniform canopy height and its frequent monitoring provided plausibility limits for the resulting estimates of time-variant d and z0. After applying, for each approach, a specific data filtering that accounted for the range of conditions (e.g. stability) for which it is valid, five of the six methods were able to describe the temporal changes of roughness parameters associated with crop growth and harvest, and four of them agreed on d to within 0.3 m most of the time. Application of the same methods to measurements with a more heterogeneous footprint consisting of fully-grown sugarbeet and a varying contribution of adjacent harvested fields exhibited a plausible dependence of the roughness parameters on the sugarbeet fraction. It also revealed that the methods producing the largest outliers can differ between site conditions and stability. We therefore conclude that when determining d for canopies with unknown properties from single-level measurements, as is increasingly done, it is important to compare the results of a number ofmethods rather than rely on a single one. An ensemble average or median of the results, possibly after elimination of methods that produce outliers, can help to yield more robust estimates. The estimates of z0 were almost exclusively physically plausible, although d was considered unknown and estimated simultaneously with the methods and results described above.
Identifier(s):DOI: 10.1007/s10546-013-9905-z
Citation Advice:Graf, Alexander; van de Boer, Anneke; Moene, Arnold; Vereecken, Harry (2014): Intercomparison of methods for the simultaneous estimation of zero-plane displacement and aerodynamic roughness length from single-level eddy-covariance data. Boundary-Layer Meteorology, 151, pp. 373-387.
Responsible Party
Creator(s):Author: Alexander Graf
Author: Anneke van de Boer
Author: Arnold F. Moene
Author: Harry Vereecken
Publisher:Springer
Topic
TR32 Topic:Atmosphere
Subject(s):CRC/TR32 Keywords: Atmosphere–Land Interaction, Boundary Layer, Estimation, Momentum Flux
Topic Category:ClimatologyMeteorologyAtmosphere
File Details
File Name:graf_2014_BLM_roughness.pdf
Data Type:Text
Size(s):15 Pages
File Size:968 kB (0.945 MB)
Date(s):Available: 2014-01-23
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
Constraints
Download Permission:OnlyTR32
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:TR32DB Data policy agreement
Geographic
North:50.8672755
East:6.4353569
South:50.8239199
West:6.3666923
Measurement Region:Ellebach
Measurement Location:Merken
Specific Informations - Publication
Status:Published
Review:PeerReview
Year:2014
Type:Article
Article Type:Journal
Source:Boundary-Layer Meteorology
Volume:151
Number Of Pages:15
Page Range:373 - 387
Metadata Details
Metadata Creator:Alexander Graf
Metadata Created:2014-09-18
Metadata Last Updated:2014-09-18
Subproject:Z3
Funding Phase:2
Metadata Language:English
Metadata Version:V40
Dataset Metrics
Page Visits:140
Metadata Downloads:0
Dataset Downloads:0
Dataset Activity
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