Weak northern and strong tropical land carbon uptake from vertical profiles of 
atmospheric CO2

Stephens, B. B.; Gurney, K. R.; Tans, P. P.; Sweeney, C.; Peters, W.; Bruhwiler, L.; Ciais, P.; Ramonet, M.; Bousquet, P.; Nakazawa, T.; Aoki, S.; Machida, T.; Inoue, G.; Vinnichenko, N.; Lloyd, J.; Jordan, Armin; Heimann, M.; Shibistova, O.; Langenfelds, R. L.; Steele, L. P.; Francey, R. J.; Denning, A. S.

doi:10.1126/science.1137004

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Weak northern and strong tropical land carbon uptake from vertical profiles of atmospheric CO₂

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Jordan, Armin
Service Facility Gas Analytical Laboratory, Dr. A. Jordan, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Heimann, M.
Department Biogeochemical Systems, Prof. M. Heimann, Max Planck Institute for Biogeochemistry, Max Planck Society;

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引用

Stephens, B. B., Gurney, K. R., Tans, P. P., Sweeney, C., Peters, W., Bruhwiler, L., Ciais, P., Ramonet, M., Bousquet, P., Nakazawa, T., Aoki, S., Machida, T., Inoue, G., Vinnichenko, N., Lloyd, J., Jordan, A., Heimann, M., Shibistova, O., Langenfelds, R. L., Steele, L. P., Francey, R. J., & Denning, A. S. (2007). Weak northern and strong tropical land carbon uptake from vertical profiles of atmospheric CO₂. Science, 316(5832), 1732-1735. doi:10.1126/science.1137004.

引用: https://hdl.handle.net/11858/00-001M-0000-000E-D5F7-A

要旨

Measurements of midday vertical atmospheric CO₂ distributions reveal annual-mean vertical CO₂ gradients that are inconsistent with atmospheric models that estimate a large transfer of terrestrial carbon from tropical to northern latitudes. The three models that most closely reproduce the observed annual-mean vertical CO₂ gradients estimate weaker northern uptake of -1.5 petagrams of carbon per year (Pg C year(-1)) and weaker tropical emission of +0.1 Pg C year(-1) compared with previous consensus estimates of -2.4 and +1.8 Pg C year(-1), respectively. This suggests that northern terrestrial uptake of industrial CO₂ emissions plays a smaller role than previously thought and that, after subtracting land-use emissions, tropical ecosystems may currently be strong sinks for CO₂. [References: 32]