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table : estimates-of-wetland-area-total-carbon-storage-carbon-dioxide-and-methane-fluxes-and-net-carbon-flux-by-major-us-region
Estimates of Wetland Area, Total Carbon Storage, Carbon Dioxide and Methane Fluxes, and Net Carbon Flux by Major U.S. Region (a-b)
This table appears in chapter 13 of the Second State of the Carbon Cycle Report (SOCCR2): A Sustained Assessment Report report.
(a) From U.S. Geological Survey’s LandCarbon Program. Cells with two numbers represent the reported minimum and maximum. Carbon amounts are in petagrams (Pg).
(b) See references for uncertainty analyses for the respective regions.
(c) Total carbon storage for the eastern United States, Great Plains, and western United States is for 2005 and is the sum of biomass (live and dead) and the upper 20 cm of soil; for Alaska, total carbon storage is the average stock from 2000 to 2009 and is the sum of biomass (live above ground, live below ground, and dead), moss, litter, surface organic soil layers, and the upper 1 m of mineral soil.
(d) Carbon dioxide (CO2) flux for the eastern United States, Great Plains, and western United States is for 2001 to 2005; for Alaska, it is for 2000 to 2009.
(e) Methane (CH4) flux for the eastern United States, Great Plains, and western United States is for 2001 to 2005 and is pre- sented in CO2 equivalent (CO2e) using a global warming potential (GWP) of 21; for Alaska, the flux is for 2000 to 2009 and is presented in CO2e using a GWP of 25. Note that CO2e is the amount of CO2 that would produce the same effect on the radiative balance of Earth’s climate system as another greenhouse gas, such as CH4 or nitrous oxide, on a 100-year timescale. For comparison to units of carbon, each kg CO2e is equivalent to 0.273 kg C (0.273 = 1/3.67). See Box P.2, Global Carbon Cycle, Global Warming Potential, and Carbon Dioxide Equivalent, in the Preface for more details.
(f) Net carbon fluxes for the eastern United States, Great Plains, and western United States are for 2001 to 2005; for Alaska, they are for 2000 to 2009.
(g) Zhu and Reed (2014).
(h) Zhu and McGuire (2011).
(i) Not reported.
(j) Zhu and Reed (2012).
(k) Zhu and McGuire (2016).
|Region||Wetland Area (km^2)||Total Carbon Storage (c) (Pg C)||CO2 Exchange (d) (Pg CO2 per Year)||CH4 Exchangee (Pg CO2 (e) per Year)||Net Carbon Flux (f) (Pg C per Year)|
|Eastern United States (g)||271,482||3.8, 4.2||–0.18, –0.048||0.186, 0.187||–0.049, –0.013|
|Great Plains (h)||30,380||0.22||NR (i)||0.082||–0.02|
|Western United States (j)||10,114||0.06, 0.07||–0.005, 0.0002||0.002||–0.0015, 0|
|Boreal Alaska – North (k)||112,007||2.4||NR||0.020||–0.002|
|Boreal Alaska – South (k)||18,627||0.9||NR 0||006||0.001|
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