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
Contrasting trends of mass and optical properties of aerosols over the Northern Hemisphere from 1992 to 2011 Atmospheric Chemistry and Physics DOI 10.5194/acp-12-9387-2012 15 October 2012 This study compares the long-term variation of mass and optical properties of atmospheric aerosols over the Northern Hemisphere, including China, the US, Canada and Europe. Contrasting trends of mass and optical properties were found from 1992 to 2011. Read more
Particle backscatter and relative humidity measured across cirrus clouds and comparison with microphysical cirrus modelling Atmospheric Chemistry and Physics DOI 10.5194/acp-12-9135-2012 5 October 2012 Advanced measurement and modelling techniques are employed to estimate the partitioning of atmospheric water between the gas phase and the condensed phase in and around cirrus clouds, and thus to identify in-cloud and out-of-cloud supersaturations with respect to ice. Read more
Diurnal variations of organic molecular tracers and stable carbon isotopic composition in atmospheric aerosols over Mt. Tai in the North China Plain: an influence of biomass burning Atmospheric Chemistry and Physics DOI 10.5194/acp-12-8359-2012 18 September 2012 This study demonstrates that crop-residue burning activities can significantly enhance the organic aerosol loading and alter the organic composition and stable carbon isotopic composition of aerosol particles in the troposphere over the North China Plain. Read more
