Articles | Volume 18, issue 1
Biogeosciences, 18, 13–24, 2021
https://doi.org/10.5194/bg-18-13-2021
Biogeosciences, 18, 13–24, 2021
https://doi.org/10.5194/bg-18-13-2021

Research article 04 Jan 2021

Research article | 04 Jan 2021

Calculating canopy stomatal conductance from eddy covariance measurements, in light of the energy budget closure problem

Richard Wehr and Scott R. Saleska

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Cited articles

Baldocchi, D. D., Luxmoore, R. J., and Hatfield, J. L.: Discerning the forest from the trees: an essay on scaling canopy stomatal conductance, Agr. Forest Meteorol., 54, 197–226, 1991. 
Charuchittipan, D., Babel, W., Mauder, M., Leps, J.-P., and Foken, T.: Extension of the Averaging Time in Eddy-Covariance Measurements and Its Effect on the Energy Balance Closure, Bound.-Lay. Meteorol., 152, 303–327, 2014. 
Foken, T.: The energy balance closure problem: An overview, Ecol. Appl., 18, 1351–1367, 2008. 
Franssen, H. J. H., Stöckli, R., Lehner, I., Rotenberg, E., and Seneviratne, S. I.: Energy balance closure of eddy-covariance data: A multisite analysis for European FLUXNET stations, Agr. Forest Meteorol., 150, 1553–1567, 2010. 
Gatzsche, K., Babel, W., Falge, E., Pyles, R. D., Paw U, K. T., Raabe, A., and Foken, T.: Footprint-weighted tile approach for a spruce forest and a nearby patchy clearing using the ACASA model, Biogeosciences, 15, 2945–2960, https://doi.org/10.5194/bg-15-2945-2018, 2018. 
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Short summary
Water and carbon exchange between plants and the atmosphere is governed by stomata: adjustable pores in the surfaces of leaves. The combined gas conductance of all the stomata in a canopy has long been estimated using an equation that is shown here to be systematically incorrect because it relies on measurements that are generally inadequate. An alternative approach is shown to be more accurate in all probable scenarios and to imply different responses of stomatal conductance to the environment.
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