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On the attribution of black and brown carbon light absorption using the Ångström exponent
Atmospheric chemistry and physics, 2013-01, Vol.13 (20), p.10535-10543
[Peer Reviewed Journal]
ISSN: 1680-7324 ;ISSN: 1680-7316 ;EISSN: 1680-7324 ;DOI: 10.5194/acp-13-10535-2013
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Title:
On the attribution of black and brown carbon light absorption using the Ångström exponent
Author:
Lack, D. A.
;
Langridge, J. M.
Is Part Of:
Atmospheric chemistry and physics, 2013-01, Vol.13 (20), p.10535-10543
Description:
The absorption Ångström exponent (AAE) of externally mixed black carbon (BCExt), or BC internally mixed with non-absorbing material (BCInt), is often used to determine the contribution of brown carbon (BrC) light absorption at short visible wavelengths. This attribution method contains assumptions with uncertainties that have not been formally assessed. We show that the potential range of AAE for BCExt (or BCInt) in the atmosphere can reasonably lead to +7% to −22% uncertainty in BCExt (or BCInt) absorption at short wavelengths derived from measurements made at longer wavelengths, where BrC is assumed not to absorb light. These uncertainties propagate to errors in the attributed absorption of BrC. For uncertainty in attributed BrC absorption to be ≤ ± 33%, 23% to 41% of total absorption must be sourced from BrC. These uncertainties would be larger if absorption by dust were also to be considered due to additional AAE assumptions. For data collected during a biomass-burning event, the mean difference between measured and AAE attributed BrC absorption was found to be 34% – an additional uncertainty in addition to the theoretical uncertainties presented. In light of the potential for introducing significant and poorly constrained errors, we caution against the universal application of the AAE method for attributing BrC absorption.
Publisher:
Copernicus Publications
Language:
English
Identifier:
ISSN: 1680-7324
ISSN: 1680-7316
EISSN: 1680-7324
DOI: 10.5194/acp-13-10535-2013
Source:
Geneva Foundation Free Medical Journals at publisher websites
Directory of Open Access Journals
Alma/SFX Local Collection
ProQuest Central
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