Black carbon in the Arctic: the underestimated role of gas flaring and residential combustion emissions Atmospheric Chemistry and Physics DOI 10.5194/acp-13-8833-2013 5 September 2013 Chemistry transport models and climate chemistry models struggle to reproduce the Arctic Haze phenomenon, and this has recently prompted changes in aerosol removal schemes to remedy the modeling problems. In this paper, we show that shortcomings in current emission data sets are at least as important. Read more
The magnitude and causes of uncertainty in global model simulations of cloud condensation nuclei Atmospheric Chemistry and Physics DOI 10.5194/acp-13-8879-2013 5 September 2013 Here we perform a variance-based analysis of a global 3-D aerosol microphysics model to quantify the magnitude and leading causes of parametric uncertainty in model-estimated present-day concentrations of cloud condensation nuclei. Read more
Global CO2 fluxes estimated from GOSAT retrievals of total column CO2 Atmospheric Chemistry and Physics DOI 10.5194/acp-13-8695-2013 3 September 2013 This paper presents one of the first estimates of the global distribution of CO2surface fluxes using total column CO2 measurements retrieved by the SRON-KIT RemoTeC algorithm from the Greenhouse gases Observing SATellite (GOSAT). GOSAT retrievals of total column CO2">Read more
Gravitational separation in the stratosphere – a new indicator of atmospheric circulation Atmospheric Chemistry and Physics DOI 10.5194/acp-13-8787-2013 3 September 2013 The O2/N2 ratio observed in the middle stratosphere, corrected for gravitational separation, showed the same mean air age as estimated from the CO2 mole fraction. Therefore, gravitational separation is usable as a new indicator of changes in the atmospheric circulation in the stratosphere. Read more
Quantitative evaluation of emission controls on primary and secondary organic aerosol sources during Beijing 2008 Olympics Atmospheric Chemistry and Physics DOI 10.5194/acp-13-8303-2013 22 August 2013 To assess the primary and secondary sources of fine organic aerosols after the aggressive implementation of air pollution controls during the 2008 Beijing Olympic Games, 12 h PM2.5 values were measured at an urban site at Peking University (PKU) and an upwind rural site at Yufa during the CAREBEIJING-2008 (Campaigns of Air quality REsearch in BEIJING and surrounding region) summer field campaign. Read more
Absorptivity of brown carbon in fresh and photo-chemically aged biomass-burning emissions Atmospheric Chemistry and Physics DOI 10.5194/acp-13-7683-2013 9 August 2013 Experiments were conducted to investigate light absorption of organic aerosol in fresh and photo-chemically aged biomass-burning emissions. Read more
ACE-FTS observations of acetonitrile in the lower stratosphere Atmospheric Chemistry and Physics DOI 10.5194/acp-13-7405-2013 2 August 2013 This work reports the first infrared satellite remote-sensing measurements of acetonitrile (CH3CN) in the Earth’s atmosphere using solar occultation measurements made by the Atmospheric Chemistry Experiment Fourier transform spectrometer (ACE-FTS) between 2004 and 2011. ACE-FTS observations of acetonitrile in the lower stratosphere">Read more
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
