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Title: Carbonaceous aerosols recorded in a southeastern Tibetan glacier: analysis of temporal variations and model estimates of sources and radiative forcing

Abstract

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, themore » 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.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1182930
Report Number(s):
PNNL-SA-103290
Journal ID: ISSN 1680-7324; KP1703020
Grant/Contract Number:  
41101063; 41125003; 2009CB723901
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 15; Journal Issue: 3; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; carbonaceous aerosol; Tibetan glacier; emissions; radiative forcing

Citation Formats

Wang, Mo, Xu, B., Cao, J., Tie, X., Wang, Hailong, Zhang, Rudong, Qian, Yun, Rasch, Philip J., Zhao, Shuyu, Wu, Guangjian, Zhao, Huabiao, Joswiak, Daniel R., Li, Jiule, and Xie, Ying. Carbonaceous aerosols recorded in a southeastern Tibetan glacier: analysis of temporal variations and model estimates of sources and radiative forcing. United States: N. p., 2015. Web. doi:10.5194/acp-15-1191-2015.
Wang, Mo, Xu, B., Cao, J., Tie, X., Wang, Hailong, Zhang, Rudong, Qian, Yun, Rasch, Philip J., Zhao, Shuyu, Wu, Guangjian, Zhao, Huabiao, Joswiak, Daniel R., Li, Jiule, & Xie, Ying. Carbonaceous aerosols recorded in a southeastern Tibetan glacier: analysis of temporal variations and model estimates of sources and radiative forcing. United States. doi:10.5194/acp-15-1191-2015.
Wang, Mo, Xu, B., Cao, J., Tie, X., Wang, Hailong, Zhang, Rudong, Qian, Yun, Rasch, Philip J., Zhao, Shuyu, Wu, Guangjian, Zhao, Huabiao, Joswiak, Daniel R., Li, Jiule, and Xie, Ying. Mon . "Carbonaceous aerosols recorded in a southeastern Tibetan glacier: analysis of temporal variations and model estimates of sources and radiative forcing". United States. doi:10.5194/acp-15-1191-2015. https://www.osti.gov/servlets/purl/1182930.
@article{osti_1182930,
title = {Carbonaceous aerosols recorded in a southeastern Tibetan glacier: analysis of temporal variations and model estimates of sources and radiative forcing},
author = {Wang, Mo and Xu, B. and Cao, J. and Tie, X. and Wang, Hailong and Zhang, Rudong and Qian, Yun and Rasch, Philip J. and Zhao, Shuyu and Wu, Guangjian and Zhao, Huabiao and Joswiak, Daniel R. and Li, Jiule and Xie, Ying},
abstractNote = {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.},
doi = {10.5194/acp-15-1191-2015},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 3,
volume = 15,
place = {United States},
year = {Mon Feb 02 00:00:00 EST 2015},
month = {Mon Feb 02 00:00:00 EST 2015}
}

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