Energy balance closure of eddy covariance data: the role of mechanical and thermal turbulence

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Title:Main Title: Energy balance closure of eddy covariance data: the role of mechanical and thermal turbulence
Description:Abstract: This paper presents a multi-site (>20) analysis of the relative and absolute energy balance (EB) closure at European FLUXNET sites, as a function of the stability parameter e, the friction velocity u*, thermallyinduced turbulence, and the time of the day. A focus of the analysis is the magnitude of EB deficits for very unstable conditions. A univariate analysis of the relative EB deficit as function of _ alone (both for individual sites and a synthesis for all sites), reveals that the relative EB deficit is larger for very unstable conditions (e <−1.0) than for less unstable conditions (−0.02 > e ≥−1.0). A bivariate analysis of the relative EB deficit as function of both e and u*, however, indicates that for situations with comparable u* the closure is better for very unstable conditions than for less unstable conditions. Our results suggest that the poorer closure for very unstable conditions identified from the univariate analysis is due to reduced u* under these conditions. In addition, we identify that the conditions characterized by smallest relative EB deficits (elevated overall turbulence, mostly during day time) correspond to cases with the largest absolute EB deficits. Thus, the total EB deficit at the sites is induced mostly under these conditions, which is particularly relevant for evapotranspiration estimates. Further, situations with the largest relative EB deficits are generally characterized by small absolute EB deficits. We also find that the relative EB deficit does generally not correspond to the regression line of absolute EB deficit with the net radiation because there is a (positive or negative) offset. This can be understood from theoretical considerations. Finally, we find that storage effects explain a considerable fraction of the large relative (but small absolute) nocturnal EB deficits, and only a limited fraction of the overall relative and absolute EB deficits.
Identifier:10.1016/j.agrformet.2010.08.005 (DOI)
Responsible Party
Creators:Harrie-Jan Hendricks-Franssen (Author), Reto Stöckli (Author), Irene Lehner (Author), Eyal Rotenberg (Author), Sonia Seneviratne (Author)
Publisher:Elsevier B.V
Publication Year:2013
Topic
TR32 Topic:Other
Related Subproject:D5
Subjects:Keywords: Land-Atmosphere Interaction, Eddy Covariance, Energy Balance Closure, Atmospheric Stability, Friction Velocity, Thermal Turbulence
File Details
Filename:2010_HendricksFranssen_AFM.pdf
Data Type:Text - Article
Size:15 Pages
File Size:773 KB
Date:Accepted: 16.08.2010
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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Specific Information - Publication
Publication Status:Published
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Agricultural and Forest Meteorology
Source Website:www.elsevier.com/locate/agrformet
Volume:150
Number of Pages:15 (1553 - 1567)
Metadata Details
Metadata Creator:Harrie-Jan Hendricks-Franssen
Metadata Created:03.12.2013
Metadata Last Updated:03.12.2013
Subproject:D5
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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