Title: Consequences of incomplete surface energy balance closure for CO2 fluxes from open-path CO2/H2O infrared gas analyzers
Author: Liu, Heping; Randerson, James T.; Lindfors, Jamie; Massman, William J.; Foken, Thomas
Source: Boundary-Layer Meteorology. 120: 65-85.
Publication Series: Journal/Magazine Article (JRNL)
Description: We present an approach for assessing the impact of systematic biases in measured energy fluxes on CO2 flux estimates obtained from open-path eddy-covariance systems. In our analysis, we present equations to analyse the propagation of errors through the Webb, Pearman, and Leuning (WPL) algorithm [Quart. J. Roy. Meteorol. Soc. 106, 85100, 1980] that is widely used to account for density fluctuations on CO2 flux measurements. Our results suggest that incomplete energy balance closure does not necessarily lead to an underestimation of CO2 fluxes despite the existence of surface energy imbalance; either an overestimation or underestimation of CO2 fluxes is possible depending on local atmospheric conditions and measurement errors in the sensible heat, latent heat, and CO2 fluxes. We use open-path eddy-covariance fluxes measured over a black spruce forest in interior Alaska to explore several energy imbalance scenarios and their consequences for CO2 fluxes.
Keywords: carbon dioxide flux, eddy covariance, error analysis, open-path CO2/H2O infrared gas analysers (IRGA), surface energy imbalance, WPL algorithm
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
XML: View XML
Liu, Heping; Randerson, James T.; Lindfors, Jamie; Massman, William J.; Foken, Thomas. 2006. Consequences of incomplete surface energy balance closure for CO2 fluxes from open-path CO2/H2O infrared gas analyzers. Boundary-Layer Meteorology. 120: 65-85.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility