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      Weak Northern and Strong Tropical Land Carbon Uptake from Vertical Profiles of Atmospheric CO 2

      Author(s): 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5 , 1 , 2 , 3 , 4 , 5
      Publication date Created:
      Publication date (Print):
      Journal: Science
      Publisher: American Association for the Advancement of Science (AAAS)

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          Abstract

          Measurements of midday vertical atmospheric CO 2 distributions reveal annual-mean vertical CO 2 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 CO 2 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 CO 2 emissions plays a smaller role than previously thought and that, after subtracting land-use emissions, tropical ecosystems may currently be strong sinks for CO 2 .

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          Increased plant growth in the northern high latitudes from 1981 to 1991

          R. Myneni, C. D. Keeling, C J Tucker … (1997)
          Article 0 comments Cited 983 times – based on 0 reviews     Review now
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            Carbon pools and flux of global forest ecosystems.

            R. Dixon, A. M. Solomon, S. Brown … (1994)
            Forest systems cover more than 4.1 x 10(9) hectares of the Earth's land area. Globally, forest vegetation and soils contain about 1146 petagrams of carbon, with approximately 37 percent of this carbon in low-latitude forests, 14 percent in mid-latitudes, and 49 percent at high latitudes. Over two-thirds of the carbon in forest ecosystems is contained in soils and associated peat deposits. In 1990, deforestation in the low latitudes emitted 1.6 +/- 0.4 petagrams of carbon per year, whereas forest area expansion and growth in mid- and high-latitude forest sequestered 0.7 +/- 0.2 petagrams of carbon per year, for a net flux to the atmosphere of 0.9 +/- 0.4 petagrams of carbon per year. Slowing deforestation, combined with an increase in forestation and other management measures to improve forest ecosystem productivity, could conserve or sequester significant quantities of carbon. Future forest carbon cycling trends attributable to losses and regrowth associated with global climate and land-use change are uncertain. Model projections and some results suggest that forests could be carbon sinks or sources in the future.
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              Observational contrains on the global atmospheric co2 budget.

              P Tans, I. Fung, T Takahashi (1990)
              Observed atmospheric concentrations of CO(2) and data on the partial pressures of CO(2) in surface ocean waters are combined to identify globally significant sources and sinks of CO(2). The atmospheric data are compared with boundary layer concentrations calculated with the transport fields generated by a general circulation model (GCM) for specified source-sink distributions. In the model the observed north-south atmospheric concentration gradient can be maintained only if sinks for CO(2) are greater in the Northern than in the Southern Hemisphere. The observed differences between the partial pressure of CO(2) in the surface waters of the Northern Hemisphere and the atmosphere are too small for the oceans to be the major sink of fossil fuel CO(2). Therefore, a large amount of the CO(2) is apparently absorbed on the continents by terrestrial ecosystems.
              Article 0 comments Cited 640 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Title: Science
                Abbreviated Title: Science
                Publisher: American Association for the Advancement of Science (AAAS)
                ISSN (Print): 0036-8075
                ISSN (Electronic): 1095-9203
                Publication date Created: June 22 2007
                Publication date (Print): June 22 2007
                Volume: 316
                Issue: 5832
                Pages: 1732-1735
                Affiliations
                [1 ]National Center for Atmospheric Research, Boulder, CO 80305, USA.
                [2 ]Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, IN 47907, USA.
                [3 ]National Oceanic and Atmospheric Administration, Boulder, CO 80305, USA.
                [4 ]Le Laboratoire des Sciences du Climat et l'Environnement, 91191 Gif sur Yvette, France.
                [5 ]Center for Atmospheric and Oceanic Studies, Tohoku University, Sendai 980-8578, Japan.
                Article
                DOI: 10.1126/science.1137004
                PubMed ID: 17588927
                SO-VID: 6321d511-908e-4739-bf87-8c4bfe56c195
                Copyright © © 2007
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