Atmospheric deposition, CO2, and change in the land carbon sink. Fernández-Martínez, M., Vicca, S., Janssens, I., A., Ciais, P., Obersteiner, M., Bartrons, M., Sardans, J., Verger, A., Canadell, J., G., Chevallier, F., Wang, X., Bernhofer, C., Curtis, P., S., Gianelle, D., Grünwald, T., Heinesch, B., Ibrom, A., Knohl, A., Laurila, T., Law, B., E., Limousin, J., M., Longdoz, B., Loustau, D., Mammarella, I., Matteucci, G., Monson, R., K., Montagnani, L., Moors, E., J., Munger, J., W., Papale, D., Piao, S., L., & Peñuelas, J. Scientific Reports, 7(1):9632, 12, 2017.
Atmospheric deposition, CO2, and change in the land carbon sink [link]Website  abstract   bibtex   
Concentrations of atmospheric carbon dioxide (CO2) have continued to increase whereas atmospheric deposition of sulphur and nitrogen has declined in Europe and the USA during recent decades. Using time series of flux observations from 23 forests distributed throughout Europe and the USA, and generalised mixed models, we found that forest-level net ecosystem production and gross primary production have increased by 1% annually from 1995 to 2011. Statistical models indicated that increasing atmospheric CO2 was the most important factor driving the increasing strength of carbon sinks in these forests. We also found that the reduction of sulphur deposition in Europe and the USA lead to higher recovery in ecosystem respiration than in gross primary production, thus limiting the increase of carbon sequestration. By contrast, trends in climate and nitrogen deposition did not significantly contribute to changing carbon fluxes during the studied period. Our findings support the hypothesis of a general CO2-fertilization effect on vegetation growth and suggest that, so far unknown, sulphur deposition plays a significant role in the carbon balance of forests in industrialized regions. Our results show the need to include the effects of changing atmospheric composition, beyond CO2, to assess future dynamics of carbon-climate feedbacks not currently considered in earth system/climate modelling.
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 title = {Atmospheric deposition, CO2, and change in the land carbon sink},
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 year = {2017},
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 pages = {9632},
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 abstract = {Concentrations of atmospheric carbon dioxide (CO2) have continued to increase whereas atmospheric deposition of sulphur and nitrogen has declined in Europe and the USA during recent decades. Using time series of flux observations from 23 forests distributed throughout Europe and the USA, and generalised mixed models, we found that forest-level net ecosystem production and gross primary production have increased by 1% annually from 1995 to 2011. Statistical models indicated that increasing atmospheric CO2 was the most important factor driving the increasing strength of carbon sinks in these forests. We also found that the reduction of sulphur deposition in Europe and the USA lead to higher recovery in ecosystem respiration than in gross primary production, thus limiting the increase of carbon sequestration. By contrast, trends in climate and nitrogen deposition did not significantly contribute to changing carbon fluxes during the studied period. Our findings support the hypothesis of a general CO2-fertilization effect on vegetation growth and suggest that, so far unknown, sulphur deposition plays a significant role in the carbon balance of forests in industrialized regions. Our results show the need to include the effects of changing atmospheric composition, beyond CO2, to assess future dynamics of carbon-climate feedbacks not currently considered in earth system/climate modelling.},
 bibtype = {article},
 author = {Fernández-Martínez, Marcos and Vicca, Sara and Janssens, Ivan. A. and Ciais, Philippe and Obersteiner, Michael and Bartrons, Mireia and Sardans, Jordi and Verger, Aleixandre and Canadell, Josep G. and Chevallier, Frédéric and Wang, Xuhui and Bernhofer, Christian and Curtis, Peter S. and Gianelle, Damiano and Grünwald, T. and Heinesch, B. and Ibrom, A. and Knohl, A. and Laurila, T. and Law, B. E. and Limousin, J. M. and Longdoz, Bernard and Loustau, D. and Mammarella, I. and Matteucci, G. and Monson, R. K. and Montagnani, Leonardo and Moors, E. J. and Munger, J. W. and Papale, D. and Piao, S. L. and Peñuelas, J.},
 journal = {Scientific Reports},
 number = {1},
 keywords = {FR_HES,FR_LBR,_FR_PUE}
}

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