Figure : figure_-2-3_cmyk

Major Components of the North American Carbon Cycle

Figure 2.3

This figure appears in chapter 2 of the Second State of the Carbon Cycle Report (SOCCR2): A Sustained Assessment Report report.

For each component, estimates are shown for average annual stock changes (boxes), fluxes (vertical arrows), and lateral transfers (horizontal arrows) from ca. 2004 to 2013, the approximately 10-year period since the First State of the Carbon Cycle Report (CCSP 2007). All values are reported as teragrams of carbon (Tg C) per year. The sum of all fluxes between the atmosphere and the land or water components equals the increase in atmospheric carbon, so none of the lateral fluxes are counted as exchange with the atmosphere. Mathematical rounding accounts for the difference between this figure’s estimated 1,009 Tg C per year added to the atmosphere over North America and the net carbon source estimate of 1,008 Tg C per year given in Table 2.2, p. 80. The net ecosystem flux of 959 Tg C per year from the atmosphere into land ecosystems is inferred from all the other fluxes based on the principle of conserving the overall mass balance of the different components. [Data sources: Data and certainty estimates are compiled and synthesized from the various chapters in this report. See Preface section titled “Treatment of Uncertainty in SOCCR2,” p. 16, for an explanation of asterisks (i.e., certainty estimates).]

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The time range for this figure is January 10, 2004 (00:00 AM) to December 31, 2013 (00:00 AM).

This figure was created on February 05, 2018.

This figure was submitted on February 11, 2019.


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