| 词条 | Airborne fraction |
| 释义 |
The airborne fraction is a scaling factor defined as the ratio of the annual increase in atmospheric {{chem|CO|2}} to the {{chem|CO|2}} emissions from anthropogenic sources.[1] It represents the proportion of human emitted {{CO2}} that remains in the atmosphere. The fraction averages about 45%, meaning that approximately half the human-emitted {{chem|CO|2}} is absorbed by ocean and land surfaces. There is some evidence for a recent increase in airborne fraction, which would imply a faster increase in atmospheric {{chem|CO|2}} for a given rate of human fossil-fuel burning.[2] Changes in carbon sinks can affect the airborne fraction. References1. ^Forster, P, V Ramaswamy, P Artaxo, et al. (2007) Changes in Atmospheric Constituents and in Radiative Forcing. In: Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on ClimateChange [Solomon, S. et al. (eds.)]. Cambridge University Press, Cambridge, UK & New York, USA. {{climate-stub}}2. ^{{cite journal|doi=10.1073/pnas.0702737104|last=Canadell|first=Josep G.|author2=Corinne Le Quere|author3=Michael R. Raupach|author4=Christopher B. Field|author5=Erik T. Buitenhuis|author6=Philippe Ciais|author7=Thomas J. Conway|author8=Nathan P. Gillett|author9=R. A. Houghton|author10=Gregg Marland|date=November 20, 2007 |title=Contributions to accelerating atmospheric CO2 growth from economic activity, carbon intensity, and efficiency of natural sinks|journal=PNAS|volume=104|issue=47|pages=18866–18870|url=http://www.pnas.org/content/104/47/18866.full.pdf|accessdate=2010-01-02|pmid=17962418|pmc=2141868}} 1 : Climatology |
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