A decadal satellite analysis of the origins and impacts of smoke in Colorado Atmospheric Chemistry and Physics DOI 10.5194/acp-13-7429-2013 2 August 2013 We analyze the record of aerosol optical depth (AOD) measured by the MODerate resolution Imaging Spectroradiometer (MODIS) aboard the Terra satellite in combination with surface PM2.5 to investigate the impact of fires on aerosol loading and air quality over Colorado from 2000 to 2012, and to evaluate the contribution of local versus transported smoke. Read more
Halogen species record Antarctic sea ice extent over glacial–interglacial periods Atmospheric Chemistry and Physics DOI 10.5194/acp-13-6623-2013 12 July 2013 Here we present speciation measurements of bromine and iodine in the TALDICE (TALos Dome Ice CorE) ice core (159°11’ E, 72°49’ S; 2315 m a.s.l.) spanning the last 215 ky. Based on our results we propose the use of both halogens for examining Antarctic variability of past sea ice extent. Read more
Formation of aqueous-phase α-hydroxyhydroperoxides (α-HHP): potential atmospheric impacts Atmospheric Chemistry and Physics DOI 10.5194/acp-13-5857-2013 17 June 2013 The focus of this work is on quantifying the degree of the aqueous-phase formation of α-hydroxyhydroperoxides (α-HHPs) via reversible nucleophilic addition of H2O2 to aldehydes. Formation of this class of highly oxygenated organic hydroperoxides represents a poorly characterized aqueous-phase processing pathway that may lead to enhanced SOA formation and aerosol toxicity. HHP): potential atmospheric impacts">Read more
Impacts of aircraft emissions on the air quality near the ground Atmospheric Chemistry and Physics DOI 10.5194/acp-13-5505-2013 6 June 2013 The continuing increase in demand for commercial aviation transport raises questions about the effects of resulting emissions on the environment. The purpose of this study is to investigate, using a global chemistry transport model, to what extent aviation emissions outside the boundary layer influence air quality in the boundary layer. Read more
Classifying organic materials by oxygen-to-carbon elemental ratio to predict the activation regime of Cloud Condensation Nuclei (CCN) Atmospheric Chemistry and Physics DOI 10.5194/acp-13-5309-2013 27 May 2013 The present results suggest that atmospheric particles dominated by hydrocarbon-like organic components do not activate (i.e., insoluble regime) whereas those dominated by oxygenated organic components activate (i.e., highly soluble regime) for typical atmospheric cloud life cycles. CCN)">Read more
Recent variability of the solar spectral irradiance and its impact on climate modelling Atmospheric Chemistry and Physics DOI 10.5194/acp-13-3945-2013 17 April 2013 We summarize here our current knowledge of solar spectral irradiance variability and its impact on Earth’s climate. Read more
Oxidation of SO2 by stabilized Criegee intermediate (sCI) radicals as a crucial source for atmospheric sulfuric acid concentrations Atmospheric Chemistry and Physics DOI 10.5194/acp-13-3865-2013 12 April 2013 The effect of increased reaction rates of stabilized Criegee intermediates (sCIs) with SO2 to produce sulfuric acid is investigated using data from two different locations, SMEAR II, Hyytiälä, Finland, and Hohenpeissenberg, Germany. Read more
Meteorological observations on the northern Chilean coast during VOCALS-REx Atmospheric Chemistry and Physics DOI 10.5194/acp-13-3409-2013 25 March 2013 Surface coastal observations from two automatic weather stations at Paposo (~25° S) and radiosonde observations at Paposo and Iquique (~20° S) were carried out during VOCALS-REx (VAMOS Ocean-Cloud-Atmosphere-Land Study Regional Experiment). VOCALS-REx">Read more
Host model uncertainties in aerosol radiative forcing estimates: results from the AeroCom Prescribed intercomparison study Atmospheric Chemistry and Physics DOI 10.5194/acp-13-3245-2013 20 March 2013 In this AeroCom Prescribed intercomparison study we systematically isolate and quantify host model uncertainties on aerosol forcing experiments through prescription of identical aerosol radiative properties in twelve participating models. Read more
Quantifying the uncertainty in simulating global tropospheric composition due to the variability in global emission estimates of Biogenic Volatile Organic Compounds Atmospheric Chemistry and Physics DOI 10.5194/acp-13-2857-2013 11 March 2013 In this study we examine the contribution of biogenic volatile organic compounds towards global tropospheric composition using the global 3-D chemistry transport model TM5 and the recently developed modified CB05 chemical mechanism. Read more
