0000000000345252

AUTHOR

C. Spindler

showing 3 related works from this author

Volatility of secondary organic aerosol during OH radical induced ageing

2011

The aim of this study was to investigate oxidation of SOA formed from ozonolysis of <i>α</i>-pinene and limonene by hydroxyl radicals. This paper focuses on changes of particle volatility, using a Volatility Tandem DMA (VTDMA) set-up, in order to explain and elucidate the mechanism behind atmospheric ageing of the organic aerosol. The experiments were conducted at the AIDA chamber facility of Karlsruhe Institute of Technology (KIT) in Karlsruhe and at the SAPHIR chamber of Forchungzentrum Jülich (FZJ) in Jülich. A fresh SOA was produced from ozonolysis of <i>α</i>-pinene or limonene and then aged by enhanced OH exposure. As an OH radical source in…

High concentrationAtmospheric ScienceLimoneneOzonolysisRadicalPhotochemistrylcsh:QC1-999AerosolJlcsh:Chemistrychemistry.chemical_compoundlcsh:QD1-999chemistryAgeingddc:550Organic chemistryVolatility (chemistry)Chemical compositionlcsh:Physics
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Aging of biogenic secondary organic aerosol via gas-phase OH radical reactions

2012

The Multiple Chamber Aerosol Chemical Aging Study (MUCHACHAS) tested the hypothesis that hydroxyl radical (OH) aging significantly increases the concentration of first-generation biogenic secondary organic aerosol (SOA). OH is the dominant atmospheric oxidant, and MUCHACHAS employed environmental chambers of very different designs, using multiple OH sources to explore a range of chemical conditions and potential sources of systematic error. We isolated the effect of OH aging, confirming our hypothesis while observing corresponding changes in SOA properties. The mass increases are consistent with an existing gap between global SOA sources and those predicted in models, and can be described b…

OzoneFree Radicals010504 meteorology & atmospheric sciencesUltraviolet Rayschemistry.chemical_element010501 environmental sciencesMass spectrometrybehavioral disciplines and activities01 natural sciencesOxygenMass SpectrometryAtmospherechemistry.chemical_compoundOzoneOrganic Chemicals0105 earth and related environmental sciencesAerosolsMultidisciplinaryOzonolysisAtmosphereHydroxyl RadicalReproducibility of ResultsAerosolOxygenModels ChemicalchemistryAtmospheric chemistryEnvironmental chemistryPhysical SciencesSolventsHydroxyl radicalProceedings of the National Academy of Sciences of the United States of America
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Surface modification of mineral dust particles by sulphuric acid processing: implications for CCN and IN abilities

2011

Abstract. The ability of coated mineral dust particles to act as cloud condensation nuclei (CCN) and ice nuclei (IN) was investigated at LACIS (Leipzig Aerosol Cloud Interaction Simulator) during the FROST1- and FROST2-campaigns (Freezing of dust). Sulphuric acid was condensed on the particles which afterwards were optionally humidified, treated with ammonia vapour and/or heat. By means of aerosol mass spectrometry we found evidence that processing of mineral dust particles with sulphuric acid leads to surface modifications of the particles. These surface modifications are responsible for the observed reduction of the IN activation of the particles. The observed particle mass spectra sugges…

ddc:550complex mixtures
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