A unified approach to infrared aerosol remote sensing and type specification Atmospheric Chemistry and Physics DOI 10.5194/acp-13-2195-2013 25 February 2013 Here we use high resolution infrared measurements for aerosol type differentiation, exploiting, in that part of spectrum, the dependency of their refractive index on wavelength. We review existing detection methods and present a unified detection method based on linear discrimination analysis. Read more
Radiative forcing of the direct aerosol effect from AeroCom Phase II simulations Atmospheric Chemistry and Physics DOI 10.5194/acp-13-1853-2013 19 February 2013 We report on the AeroCom Phase II direct aerosol effect (DAE) experiment where 16 detailed global aerosol models have been used to simulate the changes in the aerosol distribution over the industrial era. All 16 models have estimated the radiative forcing of the anthropogenic DAE, and have taken into account anthropogenic sulphate, black carbon and organic aerosols from fossil fuel, biofuel, and biomass burning emissions. Read more
Application of the Statistical Oxidation Model (SOM) to Secondary Organic Aerosol formation from photooxidation of C12 alkanes Atmospheric Chemistry and Physics DOI 10.5194/acp-13-1591-2013 8 February 2013 We apply the Statistical Oxidation Model of Cappa and Wilson (2012) to model the formation of the secondary organic aerosol from the formation of the four C12 alkanes, dodecane, 2-methyl undecane, cyclododecane and hexylcyclohexane, under both high- and low-NOxconditions, based upon data from the Caltech chambers. SOM) to Secondary Organic Aerosol formation from photooxidation of C12 alkanes">Read more
Aerosol decadal trends – Part 1: In-situ optical measurements at GAW and IMPROVE stations Atmospheric Chemistry and Physics DOI 10.5194/acp-13-869-2013 22 January 2013 Since the aerosol variables are not normally distributed, three different methods (the seasonal Mann-Kendall test associated with the Sen’s slope, the generalized least squares fit associated with an autoregressive bootstrap algorithm for confidence intervals, and the least-mean square fit applied to logarithms of the data) were applied to detect the long-term trends and their magnitudes. GAW and IMPROVE stations">Read more
Aerosol decadal trends – Part 2: In-situ aerosol particle number concentrations at GAW and ACTRIS stations Atmospheric Chemistry and Physics DOI 10.5194/acp-13-895-2013 22 January 2013 We have analysed the trends of total aerosol particle number concentrations (N) measured at long-term measurement stations involved either in the Global Atmosphere Watch (GAW) and/or EU infrastructure project ACTRIS. This work provides a useful comparison analysis for modelling studies of trends in aerosol number concentrations. GAW and ACTRIS stations">Read more
Efficient determination of vehicle emission factors by fuel use category using on-road measurements: downward trends on Los Angeles freight corridor I-710 Atmospheric Chemistry and Physics DOI 10.5194/acp-13-347-2013 11 January 2013 We developed an alternative method that links real-time on-road pollutant measurements from a mobile platform with real-time traffic data, and allows efficient calculation of both the average and the spread of vehicle emission factors for light-duty gasoline-powered vehicles and heavy-duty diesel-powered vehicles. Read more
No statistically significant effect of a short-term decrease in the nucleation rate on atmospheric aerosols Atmospheric Chemistry and Physics DOI 10.5194/acp-12-11573-2012 4 December 2012 We use a global aerosol microphysics model to determine whether a 10 day reduction of 15% in the nucleation rate could generate a statistically significant response in aerosol concentrations and optical properties. Read more
Sea-spray geoengineering in the HadGEM2-ES earth-system model: radiative impact and climate response Atmospheric Chemistry and Physics DOI 10.5194/acp-12-10887-2012 16 November 2012 The radiative impact and climate effects of geoengineering using sea-spray aerosols have been investigated in the HadGEM2-ES Earth system model using a fully prognostic treatment of the sea-spray aerosols and also including their direct radiative effect. Read more
Future air quality in Europe: a multi-model assessment of projected exposure to ozone Atmospheric Chemistry and Physics DOI 10.5194/acp-12-10613-2012 13 November 2012 In order to explore future air quality in Europe at the 2030 horizon, two emission scenarios developed in the framework of the Global Energy Assessment including varying assumptions on climate and energy access policies are investigated with an ensemble of six regional and global atmospheric chemistry transport models. Read more
Multi-generation gas-phase oxidation, equilibrium partitioning, and the formation and evolution of secondary organic aerosol Atmospheric Chemistry and Physics DOI 10.5194/acp-12-9505-2012 22 October 2012 A new model of secondary organic aerosol (SOA) formation is developed that explicitly takes into account multi-generational oxidation as well as fragmentation of gas-phase compounds, and assumes equilibrium gas-particle partitioning. Read more
