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Abstract
From July to September 2012, during the fifth Chinese National Arctic Research Expedition (CHINARE), the concentrations of black carbon (BC) aerosols inside the marine boundary layer were measured by an in situ aethalometer. BC concentrations ranged from 0.20 ng∙m−3 to 1063.20 ng∙m−3, with an average of 75.74 ng∙m−3. The BC concentrations were significantly higher over the mid-latitude and coastal areas than those over the remote ocean and high latitude areas. The highest average concentration was found over offshore China (643.44 ng∙m−3) during the cruise, while the lowest average was found over the Arctic Ocean (5.96 ng∙m−3). BC aerosol was found mainly affected by the terrestrial input and displayed seasonal and spatial variations. Compared with the results from the third and fourth CHINARE of summer 2008, and summer 2010, the inter-annual variation of BC over the Arctic Ocean was negligible.
Highlights
Black carbon (BC) aerosol is a kind of amorphous carbon released to the atmosphere by incomplete combustion of fossil and biomass fuels [1]
This study provides updated information on the spatial distribution of BC
BC concentrations were monitored on the icebreaker, Xuelong, during the 5th Chinese National Arctic Research Expedition (CHINARE) 2012
Summary
Black carbon (BC) aerosol is a kind of amorphous carbon released to the atmosphere by incomplete combustion of fossil and biomass fuels [1]. It can be found in the atmosphere, soil, snow, ice, ocean and lake sediments. BC is the main component in atmospheric aerosols absorbing sunlight and can hardly be depleted through chemical reactions in the atmosphere. It is mainly removed by rain and snowfall [2]. Previous studies implied that scattered aerosols can greatly increase the BC positive radiation forcing [4]
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