Weak northern and strong tropical land carbon uptake from vertical profiles of atmospheric CO2.
نویسندگان
چکیده
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.
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www.sciencemag.org (this information is current as of June 22, 2007 ): The following resources related to this article are available online at http://www.sciencemag.org/cgi/content/full/316/5832/1732 version of this article at: including high-resolution figures, can be found in the online Updated information and services, http://www.sciencemag.org/cgi/content/full/316/5832/1732/DC1 can be found...
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ورودعنوان ژورنال:
- Science
دوره 316 5832 شماره
صفحات -
تاریخ انتشار 2007