Articles | Volume 21, issue 12
https://doi.org/10.5194/bg-21-3015-2024
https://doi.org/10.5194/bg-21-3015-2024
Research article
 | 
28 Jun 2024
Research article |  | 28 Jun 2024

Separating above-canopy CO2 and O2 measurements into their atmospheric and biospheric signatures

Kim A. P. Faassen, Jordi Vilà-Guerau de Arellano, Raquel González-Armas, Bert G. Heusinkveld, Ivan Mammarella, Wouter Peters, and Ingrid T. Luijkx

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Short summary
The ratio between atmospheric O2 and CO2 can be used to characterize the carbon balance at the surface. By combining a model and observations from the Hyytiälä forest (Finland), we show that using atmospheric O2 and CO2 measurements from a single height provides a weak constraint on the surface CO2 exchange because large-scale processes such as entrainment confound this signal. We therefore recommend always using multiple heights of O2 and CO2 measurements to study surface CO2 exchange.
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