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Decrease of emissions required to stabilize atmospheric CO 2 due to positive carbon cycle–climate feedbacks
Author(s) -
Matthews H. Damon
Publication year - 2005
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl023435
Subject(s) - environmental science , carbon cycle , greenhouse gas , climate change , climate model , atmospheric sciences , climatology , carbon fibers , atmospheric carbon cycle , ecosystem , geology , oceanography , ecology , materials science , composite number , composite material , biology
Positive feedbacks between the carbon cycle and climate have the potential to accelerate the accumulation of atmospheric CO 2 over the next century. Here, I address the question of how climate‐induced carbon cycle changes could affect the emissions required to stabilize atmospheric CO 2 at 1000 ppmv. From a coupled climate‐carbon cycle simulation, I calculated emissions that are consistent with a prescribed CO 2 stabilization pathway. By comparing a coupled simulation with a second constant‐climate simulation, I show that carbon cycle‐climate feedbacks lead to large decreases in allowable emissions. Cumulative emissions are reduced by 94, 230 and 754 GtC between 2005 and years 2050, 2100 and 2350 respectively. Annual differences are largest at 2080, where emissions are reduced by 2.8 GtC/year. Further, while terrestrial feedbacks dominate for the next two centuries, the effect of ocean feedbacks on allowable emissions begin to exceed that of terrestrial feedbacks around the year 2250.