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

@article{Stephens2007WeakNA,
  title={Weak northern and strong tropical land carbon uptake from vertical profiles of atmospheric CO2.},
  author={Britton B Stephens and Kevin R. Gurney and Pieter Tans and Colm Sweeney and Wouter Peters and Lori Perliski Bruhwiler and Philippe Ciais and Michel Ramonet and Philippe Bousquet and Takakiyo Nakazawa and Shuji Aoki and Toshinobu Machida and Gen Inoue and Nikolay Vinnichenko and Jon C. Lloyd and Armin Jordan and M Heimann and O. B. Shibistova and Ray L. Langenfelds and L. Paul Steele and R. Francey and Allan Scott Denning},
  journal={Science},
  year={2007},
  volume={316 5832},
  pages={1732-5}
}
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… CONTINUE READING
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