English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
  Attenuation Correction Procedures for Water Vapour Fluxes from Closed-Path Eddy-Covariance Systems

Runkle, B., Wille, C., Gazovic, M., & Kutzbach, L. (2012). Attenuation Correction Procedures for Water Vapour Fluxes from Closed-Path Eddy-Covariance Systems. Boundary-Layer Meteorology, 142(3), 401-423. doi:10.1007/s10546-011-9689-y.

Item is

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Runkle, Benjamin1, Author           
Wille, Christian, Author
Gazovic, Michal, Author
Kutzbach, Lars1, Author
Affiliations:
1CRG Regional Hydrology in Terrestrial Systems, Research Area B: Climate Manifestations and Impacts, The CliSAP Cluster of Excellence, External Organizations, Bundesstraße 53, 20146 Hamburg, DE, ou_2025292              

Content

show
hide
Free keywords: FREQUENCY-RESPONSE CORRECTIONS; CARBON-DIOXIDE; CONCENTRATION FLUCTUATIONS; SPECTRAL CHARACTERISTICS; TRACE GASES; EXCHANGE; ANALYZERS; HEAT; FORESTS; PEARMANClosed-path sensors; Eddy covariance; Flux uncertainties; High-frequency correction; Water vapour fluxes;
 Abstract: Evapotranspiration is a source of water vapour to the atmosphere, and as a crucial indicator of landscape behaviour its accurate measurement has widespread implications. Here we investigate errors that are prevalent and systematic in the closed-path eddy-covariance measurement of latent heat flux: the attenuation of fluxes through dampened cospectral power at high frequencies. This process is especially pronounced during periods of high relative humidity through the adsorption and desorption of water vapour along the tube walls. These effects are additionally amplified during lower air temperature conditions. Here, we quantify the underestimation of evapotranspiration by a closed-path system by comparing its flux estimate to simultaneous and adjacent measurements from an open-path sensor. We apply models relating flux loss to relative humidity itself, to the lag time of the cross-correlation peak between the water vapour and vertical wind velocity signals, and to models of cospectral attenuation relative to the cospectral power of simultaneous sensible heat-flux measurements. We find that including the role of temperature in modifying the attenuation-humidity relationship is essential for unbiased flux correction, and that physically based cospectral attenuation methods are effective characterizers of closed-path instrument signal loss relative to the unattenuated flux value.

Details

show
hide
Language(s): eng - English
 Dates: 2012-03
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: ISI: 000305970300004
DOI: 10.1007/s10546-011-9689-y
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Boundary-Layer Meteorology
  Other : Bound.-Layer Meteor.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 142 (3) Sequence Number: - Start / End Page: 401 - 423 Identifier: ISSN: 0006-8314