A Modelling Study of the Impact of On-Road Diesel Emissions on Arctic Black Carbon and Solar Radiation TransferReport as inadecuate




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Department of Physical and Chemical Sciences, Università degli Studi dell’Aquila, Via Vetoio, Coppito, 67100 L’Aquila, Italy





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Academic Editor: Ivar S.A. Isaksen

Abstract Market strategies have greatly incentivized the use of diesel engines for land transportation. These engines are responsible for a large fraction of black carbon BC emissions in the extra-tropical Northern Hemisphere, with significant effects on both air quality and global climate. In addition to direct radiative forcing, planetary-scale transport of BC to the Arctic region may significantly impact the surface albedo of this region through wet and dry deposition on ice and snow. A sensitivity study is made with the University of L’Aquila climate-chemistry-aerosol model by eliminating on-road diesel emissions of BC which represent approximately 50% of BC emissions from land transportation. According to the model and using emission scenarios for the year 2000, this would imply an average change in tropopause direct radiative forcing RF of −0.054 W∙m−2 globally and −0.074 W∙m−2 over the Arctic region, with a peak of −0.22 W∙m−2 during Arctic springtime months. These RF values increase to −0.064, −0.16 and −0.50 W∙m−2, respectively, when also taking into account the BC snow-albedo forcing. The calculated BC optical thickness decrease at λ = 0.55 µm is 0.48 × 10−3 globally and 0.74 × 10−3 over the Arctic i.e., 10.5% and 16.5%, respectively, with a peak of 1.3 × 10−3 during the Arctic springtime. View Full-Text

Keywords: black carbon aerosols; global-scale aerosol model; large-scale atmospheric transport; radiative forcing; snow-albedo forcing black carbon aerosols; global-scale aerosol model; large-scale atmospheric transport; radiative forcing; snow-albedo forcing





Author: Giovanni Pitari * , Glauco Di Genova and Natalia De Luca

Source: http://mdpi.com/



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