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Volume 14, issue 2
Biogeosciences, 14, 389–401, 2017
https://doi.org/10.5194/bg-14-389-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Biogeosciences, 14, 389–401, 2017
https://doi.org/10.5194/bg-14-389-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 26 Jan 2017

Research article | 26 Jan 2017

Dynamics of canopy stomatal conductance, transpiration, and evaporation in a temperate deciduous forest, validated by carbonyl sulfide uptake

Richard Wehr et al.

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Baker, I. T., Prihodko, L., Denning, A. S., Goulden, M. L., Miller, S., and da Rocha, H. R.: Seasonal drought stress in the Amazon: Reconciling models and observations, J. Geophys. Res., 113, G00B01, https://doi.org/10.1029/2007JG000644, 2008.
Barbour, M. M., Cernusak, L. A., Whitehead, D., Griffin, K. L., Turnbull, M. H., Tissue, D. T., and Farquhar, G. D.: Nocturnal stomatal conductance and implications for modelling δ18O of leaf-respired CO2 in temperate tree species, Funct. Plant Biol., 32, 1107–1121, https://doi.org/10.1071/FP05118, 2005.
Berry, J. A., Wolf, A., Campbell, J. E., Baker, I., Blake, N., Blake, D., Denning, A. S., Kawa, S. R., Montzka, S. A., Seibt, U., Stimler, K., Yakir, D. and Zhu, Z.: A coupled model of the global cycles of carbonyl sulfide and CO2: A possible new window on the carbon cycle, J. Geophys. Res.-Biogeo., 118, 842–852, https://doi.org/10.1002/jgrg.20068, 2013.
Blonquist, J. M., Montzka, S. A., and Munger, J. W.: The potential of carbonyl sulfide as a proxy for gross primary production at flux tower sites, J. Geophys. Res., 116, G04019, https://doi.org/10.1029/2011JG001723, 2011.
Bonan, G. B., Lawrence, P. J., Oleson, K. W., Levis, S., Jung, M., Reichstein, M., Lawrence, D. M., and Swenson, S. C.: Improving canopy processes in the Community Land Model version 4 (CLM4) using global flux fields empirically inferred from FLUXNET data, J. Geophys. Res., 116, G02014, https://doi.org/10.1029/2010JG001593, 2011.
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Leaf stomata influence both photosynthesis and transpiration, coupling the carbon and water cycles, but there is no direct method for estimating stomatal behavior on the ecosystem scale. We use the ecosystem–atmosphere exchange of water, heat, and carbonyl sulfide to estimate canopy-integrated stomatal conductance by two independent methods. We then use that conductance to show that the seasonal dynamics of transpiration and evaporation are different than represented in current biosphere models.
Leaf stomata influence both photosynthesis and transpiration, coupling the carbon and water...
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