 |
| Titel |
Contribution of organic carbon to wood smoke particulate matter absorption of solar radiation |
| VerfasserIn |
T. W. Kirchstetter, T. L. Thatcher |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 14 ; Nr. 12, no. 14 (2012-07-16), S.6067-6072 |
| Datensatznummer |
250011313
|
| Publikation (Nr.) |
 copernicus.org/acp-12-6067-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| A spectroscopic analysis of 115 wintertime particulate matter samples
collected in rural California shows that wood smoke absorbs solar radiation
with a strong spectral selectivity. This is consistent with prior work that
has demonstrated that organic carbon (OC), in addition to black carbon (BC),
appreciably absorbs solar radiation in the visible and ultraviolet spectral
regions. We apportion light absorption to OC and BC and find that the
absorption Ångström exponent of the light-absorbing OC in these
samples ranges from 3.0 to 7.4 and averages 5.0. Further, we calculate that
OC would account for 14% and BC would account for 86% of solar
radiation absorbed by the wood smoke in the atmosphere (integrated over the
solar spectrum from 300 to 2500 nm). OC would contribute 49% of the wood
smoke particulate matter absorption of ultraviolet solar radiation at
wavelengths below 400 nm and, therefore, may affect tropospheric
photochemistry. These results illustrate that BC is the dominant
light-absorbing particulate matter species in atmospheres burdened with
residential wood smoke and OC absorption is secondary but not insignificant.
Further, these results add to the growing body of evidence that
light-absorbing OC is ubiquitous in atmospheres influenced by biomass
burning and may be important to include when considering particulate matter
effects on climate. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|