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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

Journal Article · · Atmospheric Chemistry and Physics (Online)

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.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
41101063; 41125003; 2009CB723901
OSTI ID:
1182930
Report Number(s):
PNNL-SA-103290; KP1703020
Journal Information:
Atmospheric Chemistry and Physics (Online), Vol. 15, Issue 3; ISSN 1680-7324
Publisher:
European Geosciences UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 60 works
Citation information provided by
Web of Science

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Cited By (18)

Black carbon (BC) in a northern Tibetan mountain: effect of Kuwait fires on glaciers journal January 2018
Variability in individual particle structure and mixing states between the glacier–snowpack and atmosphere in the northeastern Tibetan Plateau journal January 2018
Radiative forcing by light-absorbing particles in snow journal October 2018
Sources of black carbon to the Himalayan–Tibetan Plateau glaciers journal August 2016
Black carbon-induced snow albedo reduction over the Tibetan Plateau: uncertainties from snow grain shape and aerosol–snow mixing state based on an updated SNICAR model journal January 2018
Impact of light-absorbing particles on snow albedo darkening and associated radiative forcing over high-mountain Asia: high-resolution WRF-Chem modeling and new satellite observations journal January 2019
Linking atmospheric pollution to cryospheric change in the Third Pole region: current progress and future prospects journal March 2019
Radiative feedbacks of dust in snow over eastern Asia in CAM4-BAM journal January 2018
Saharan dust events in the European Alps: role in snowmelt and geochemical characterization journal January 2019
Quantifying the light absorption and source attribution of insoluble light-absorbing particles on Tibetan Plateau glaciers between 2013 and 2015 journal January 2019
Black carbon and mineral dust in snow cover on the Tibetan Plateau journal January 2018
Quantifying sources, transport, deposition, and radiative forcing of black carbon over the Himalayas and Tibetan Plateau journal January 2015
First simultaneous measurements of peroxyacetyl nitrate (PAN) and ozone at Nam Co in the central Tibetan Plateau: impacts from the PBL evolution and transport processes journal January 2018
Distributions and light absorption property of water soluble organic carbon in a typical temperate glacier, southeastern Tibetan Plateau journal January 2018
Seasonal variation and light absorption property of carbonaceous aerosol in a typical glacier region of the southeastern Tibetan Plateau journal January 2018
Black carbon and mineral dust in snow cover on the Tibetan Plateau text January 2018
Saharan dust events in the European Alps: role on snowmelt and geochemical characterization posted_content November 2018
Quantifying sources, transport, deposition and radiative forcing of black carbon over the Himalayas and Tibetan Plateau journal January 2015

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