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An atmospheric perspective on North American carbon dioxide exchange: CarbonTracker. | LitMetric

AI Article Synopsis

  • The study estimates the net CO2 exchange between North America's terrestrial biosphere and the atmosphere from 2000 to 2005, using 28,000 atmospheric CO2 observations processed through CarbonTracker, a sophisticated data assimilation system.
  • North America’s terrestrial biosphere acted as a carbon sink, absorbing an average of -0.65 PgC/yr, which partially offsets the 1.85 PgC/yr released from fossil fuel burning and cement production.
  • The research indicates geographical variations in carbon uptake, with significant contributions from eastern deciduous forests and boreal coniferous forests, and highlights the impact of extreme climatic events, such as the 2002 drought, on carbon sink efficiency.

Article Abstract

We present an estimate of net CO(2) exchange between the terrestrial biosphere and the atmosphere across North America for every week in the period 2000 through 2005. This estimate is derived from a set of 28,000 CO(2) mole fraction observations in the global atmosphere that are fed into a state-of-the-art data assimilation system for CO(2) called CarbonTracker. By design, the surface fluxes produced in CarbonTracker are consistent with the recent history of CO(2) in the atmosphere and provide constraints on the net carbon flux independent from national inventories derived from accounting efforts. We find the North American terrestrial biosphere to have absorbed -0.65 PgC/yr (1 petagram = 10(15) g; negative signs are used for carbon sinks) averaged over the period studied, partly offsetting the estimated 1.85 PgC/yr release by fossil fuel burning and cement manufacturing. Uncertainty on this estimate is derived from a set of sensitivity experiments and places the sink within a range of -0.4 to -1.0 PgC/yr. The estimated sink is located mainly in the deciduous forests along the East Coast (32%) and the boreal coniferous forests (22%). Terrestrial uptake fell to -0.32 PgC/yr during the large-scale drought of 2002, suggesting sensitivity of the contemporary carbon sinks to climate extremes. CarbonTracker results are in excellent agreement with a wide collection of carbon inventories that form the basis of the first North American State of the Carbon Cycle Report (SOCCR), to be released in 2007. All CarbonTracker results are freely available at http://carbontracker.noaa.gov.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2141884PMC
http://dx.doi.org/10.1073/pnas.0708986104DOI Listing

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