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| Titel |
Carbonaceous aerosols recorded in a southeastern Tibetan glacier: analysis of temporal variations and model estimates of sources and radiative forcing |
| VerfasserIn |
M. Wang, B. Xu, J. Cao, X. Tie, H. Wang, R. Zhang, Y. Qian, P. J. Rasch, S. Zhao, G. Wu, H. Zhao, D. R. Joswiak, J. Li, Y. Xie |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 3 ; Nr. 15, no. 3 (2015-02-02), S.1191-1204 |
| Datensatznummer |
250119385
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| Publikation (Nr.) |
 copernicus.org/acp-15-1191-2015.pdf |
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| Zusammenfassung |
| High temporal resolution measurements of black carbon (BC) and organic carbon
(OC) covering the time period of 1956–2006 in an ice core over the
southeastern Tibetan Plateau show a distinct seasonal dependence of BC and OC
with higher respective concentrations but a lower OC / BC ratio in the
non-monsoon season than during the summer monsoon. We use a global
aerosol-climate model, in which BC emitted from different source regions can
be explicitly tracked, to quantify BC source–receptor relationships between
four Asian source regions and the southeastern Tibetan Plateau as a receptor.
The model results show that South Asia has the largest contribution to the
present-day (1996–2005) mean BC deposition at the ice-core drilling site
during the non-monsoon season (October to May) (81%) and all year round
(74%), followed by East Asia (14% to the non-monsoon mean and
21% to the annual mean). The ice-core record also indicates stable and
relatively low BC and OC deposition fluxes from the late 1950s to 1980,
followed by an overall increase to recent years. This trend is consistent
with the BC and OC emission inventories and the fuel consumption of South
Asia (as the primary contributor to annual mean BC deposition). Moreover, the
increasing trend of the OC / BC ratio since the early 1990s indicates a
growing contribution of coal combustion and/or biomass burning to the
emissions. The estimated radiative forcing induced by BC and OC impurities in
snow has increased since 1980, suggesting an increasing potential influence
of carbonaceous aerosols on the Tibetan glacier melting and the availability
of water resources in the surrounding regions. Our study indicates that more
attention to OC is merited because of its non-negligible light absorption and
the recent rapid increases evident in the ice-core record. |
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