Figure : figure_es-2_word

ES.2. Major Carbon Fluxes of North America

Figure ES.2

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

Net fluxes and transfers of carbon among the atmosphere, land, and water are depicted in this simplified representation of the North American carbon cycle. The diagram includes fluxes of carbon dioxide but not methane or other carbon-containing greenhouse gases. These carbon flows include 1) emissions (red arrows); 2) uptake (black arrows); 3) lateral transfers (blue arrows); and 4) burial (blue arrows), which involves transfers of carbon from water to sediments and soils. Estimates—derived from Figure ES.3, p. 27, and Figure 2.3, p. 83, in Ch. 2: The North American Carbon Budget—are in teragrams of carbon (Tg C) per year. The increase in atmospheric carbon, denoted by a positive value, represents the net annual change resulting from the addition of carbon emissions minus net uptake of atmospheric carbon by ecosystems and coastal waters. Net ecosystem carbon uptake represents the balance of carbon fluxes between the atmosphere and land (i.e., soils, grasslands, forests, permafrost, and boreal and Arctic ecosystems). Coastal waters include tidal wetlands, estuaries, and the coastal ocean (see Figure ES.3 for details). The net land sink, denoted by a positive value, is the net uptake by ecosystems and tidal wetlands (Figure ES.3) minus emissions from harvested wood and inland waters and estuaries (Figure ES.3). For consistency, the land sink estimate of 606 Tg C per year is adopted from Ch. 2, p. 71. Because of rounding of the numbers in that chapter, this value differs slightly from the combined estimate from Figures ES.2 and ES.3 (605 Tg C per year). Asterisks indicate that there is 95% confidence that the actual value is within 10% (*****), 25% (****), 50% (***), 100% (**), or >100% (*) of the reported value. [Figure source: Adapted from Ciais et al., 2013, Figures 6.1 and 6.2; Copyright IPCC, used with permission.]

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The time range for this figure is January 01, 2004 (00:00 AM) to December 31, 2013 (00:00 AM).

This figure was created on February 05, 2018.

This figure was submitted on March 22, 2019.

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