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Showing 1–14 of 14 results
Advanced filters: Author: Andreas Kürten Clear advanced filters

  • The growth rates of freshly formed aerosol particles influence what fraction of these can reach sizes large enough to affect cloud formation and climate. Here, the authors show that the nano-particle growth in a sulphuric acid containing system can be enhanced by the presence of ions or small acid-base clusters.

    • Katrianne Lehtipalo
    • Linda Rondo
    • Markku Kulmala
    ResearchOpen Access
    Nature Communications
    Volume: 7, P: 1-9

  • Experiments performed in the CERN CLOUD chamber show that, under upper-tropospheric conditions, new atmospheric particle formation may be initiated by the reaction of hydroxyl radicals with isoprene emitted by rainforests.

    • Jiali Shen
    • Douglas M. Russell
    • Xu-Cheng He
    ResearchOpen Access
    Nature
    Volume: 636, P: 115-123

  • Aircraft measurements over the Amazon show that new particle formation in the upper troposphere emerges when isoprene, emitted by forests, undergoes oxidation in the presence of nitrogen oxides produced by lightning.

    • Joachim Curtius
    • Martin Heinritzi
    • Jos Lelieveld
    ResearchOpen Access
    Nature
    Volume: 636, P: 124-130

  • Iodic acid (HIO3) forms aerosols very efficiently, but its gas-phase formation mechanism is not well understood. Atmospheric simulation chamber experiments, quantum chemical calculations and kinetic modelling have now revealed that HIO3 forms as an early iodine oxidation product from hypoiodite. The mechanism explains field measurements and suggests a catalytic role for iodine in particle formation.

    • Henning Finkenzeller
    • Siddharth Iyer
    • Rainer Volkamer
    ResearchOpen Access
    Nature Chemistry
    Volume: 15, P: 129-135

  • By performing experiments under upper tropospheric conditions, nitric acid, sulfuric acid and ammonia can form particles synergistically, at rates orders of magnitude faster than any two of the three components.

    • Mingyi Wang
    • Mao Xiao
    • Neil M. Donahue
    ResearchOpen Access
    Nature
    Volume: 605, P: 483-489

  • Measurements in the CLOUD chamber at CERN show that the rapid condensation of ammonia and nitric acid vapours could be important for the formation and survival of new particles in wintertime urban conditions, contributing to urban smog.

    • Mingyi Wang
    • Weimeng Kong
    • Neil M. Donahue
    ResearchOpen Access
    Nature
    Volume: 581, P: 184-189

  • The growth of nucleated organic particles has been investigated in controlled laboratory experiments under atmospheric conditions; initial growth is driven by organic vapours of extremely low volatility, and accelerated by more abundant vapours of slightly higher volatility, leading to markedly different modelled concentrations of atmospheric cloud condensation nuclei when this growth mechanism is taken into account.

    • Jasmin Tröstl
    • Wayne K. Chuang
    • Urs Baltensperger
    ResearchOpen Access
    Nature
    Volume: 533, P: 527-531

  • Aerosol particles can form in the atmosphere by nucleation of highly oxidized biogenic vapours in the absence of sulfuric acid, with ions from Galactic cosmic rays increasing the nucleation rate by one to two orders of magnitude compared with neutral nucleation.

    • Jasper Kirkby
    • Jonathan Duplissy
    • Joachim Curtius
    ResearchOpen Access
    Nature
    Volume: 533, P: 521-526

  • Jet engine lubrication oil is an efficient nucleation agent that likely contributes to high levels of ultrafine particles near airports contributing to poor air quality, suggest laboratory thermodenuder experiments and observations near Frankfurt International Airport.

    • Florian Ungeheuer
    • Lucía Caudillo
    • Alexander L. Vogel
    ResearchOpen Access
    Communications Earth & Environment
    Volume: 3, P: 1-8