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| Titel |
Anthropogenic and biophysical contributions to increasing atmospheric CO2 growth rate and airborne fraction |
| VerfasserIn |
M. R. Raupach, J. G. Canadell, C. Quéré |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 5, no. 6 ; Nr. 5, no. 6 (2008-11-28), S.1601-1613 |
| Datensatznummer |
250002926
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| Publikation (Nr.) |
 copernicus.org/bg-5-1601-2008.pdf |
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| Zusammenfassung |
| We quantify the relative roles of natural and anthropogenic influences on
the growth rate of atmospheric CO2 and the CO2 airborne fraction,
considering both interdecadal trends and interannual variability. A combined
ENSO-Volcanic Index (EVI) relates most (~75%) of the interannual
variability in CO2 growth rate to the El-Niño-Southern-Oscillation
(ENSO) climate mode and volcanic activity. Analysis of several CO2 data
sets with removal of the EVI-correlated component confirms a previous
finding of a detectable increasing trend in CO2 airborne fraction
(defined using total anthropogenic emissions including fossil fuels and land
use change) over the period 1959–2006, at a proportional growth rate
0.24% y−1 with probability ~0.9 of a positive trend. This
implies that the atmospheric CO2 growth rate increased slightly faster
than total anthropogenic CO2 emissions. To assess the combined roles
of the biophysical and anthropogenic drivers of atmospheric CO2 growth,
the increase in the CO2 growth rate (1.9% y−1
over 1959–2006) is expressed as the sum of the growth rates of four global
driving factors: population (contributing +1.7% y−1); per capita
income (+1.8% y−1); the total carbon intensity of the global economy
(−1.7% y−1); and airborne fraction (averaging +0.2% y−1
with strong interannual variability). The first three of these factors,
the anthropogenic drivers, have therefore dominated the last, biophysical
driver as contributors to accelerating CO2 growth. Together, the recent
(post-2000) increase in growth of per capita income and decline in the
negative growth (improvement) in the carbon intensity of the economy
will drive a significant further acceleration in the CO2 growth rate
over coming decades, unless these recent trends reverse. |
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