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  • Schmale, JuliaPaul Scherrer Institute (författare)

Long-term cloud condensation nuclei number concentration, particle number size distribution and chemical composition measurements at regionally representative observatories

  • Artikel/kapitelEngelska2018

Förlag, utgivningsår, omfång ...

  • 2018-02-28
  • Copernicus GmbH,2018
  • 29 s.

Nummerbeteckningar

  • LIBRIS-ID:oai:lup.lub.lu.se:660dbf77-ff3b-4315-a041-58ceae3ae89c
  • https://lup.lub.lu.se/record/660dbf77-ff3b-4315-a041-58ceae3ae89cURI
  • https://doi.org/10.5194/acp-18-2853-2018DOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

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Klassifikation

  • Ämneskategori:art swepub-publicationtype
  • Ämneskategori:ref swepub-contenttype

Anmärkningar

  • Aerosol-cloud interactions (ACI) constitute the single largest uncertainty in anthropogenic radiative forcing. To reduce the uncertainties and gain more confidence in the simulation of ACI, models need to be evaluated against observations, in particular against measurements of cloud condensation nuclei (CCN). Here we present a data set - ready to be used for model validation - of long-term observations of CCN number concentrations, particle number size distributions and chemical composition from 12 sites on 3 continents. Studied environments include coastal background, rural background, alpine sites, remote forests and an urban surrounding. Expectedly, CCN characteristics are highly variable across site categories. However, they also vary within them, most strongly in the coastal background group, where CCN number concentrations can vary by up to a factor of 30 within one season. In terms of particle activation behaviour, most continental stations exhibit very similar activation ratios (relative to particles 20nm) across the range of 0.1 to 1.0% supersaturation. At the coastal sites the transition from particles being CCN inactive to becoming CCN active occurs over a wider range of the supersaturation spectrum. Several stations show strong seasonal cycles of CCN number concentrations and particle number size distributions, e.g. at Barrow (Arctic haze in spring), at the alpine stations (stronger influence of polluted boundary layer air masses in summer), the rain forest (wet and dry season) or Finokalia (wildfire influence in autumn). The rural background and urban sites exhibit relatively little variability throughout the year, while short-term variability can be high especially at the urban site. The average hygroscopicity parameter, calculated from the chemical composition of submicron particles was highest at the coastal site of Mace Head (0.6) and lowest at the rain forest station ATTO (0.2-0.3). We performed closure studies based on -Köhler theory to predict CCN number concentrations. The ratio of predicted to measured CCN concentrations is between 0.87 and 1.4 for five different types of . The temporal variability is also well captured, with Pearson correlation coefficients exceeding 0.87. Information on CCN number concentrations at many locations is important to better characterise ACI and their radiative forcing. But long-term comprehensive aerosol particle characterisations are labour intensive and costly. Hence, we recommend operating migrating-CCNCs to conduct collocated CCN number concentration and particle number size distribution measurements at individual locations throughout one year at least to derive a seasonally resolved hygroscopicity parameter. This way, CCN number concentrations can only be calculated based on continued particle number size distribution information and greater spatial coverage of long-term measurements can be achieved.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Henning, SilviaLeibniz Institute for Tropospheric Research (TROPOS) (författare)
  • Decesari, StefanoCNR Institute of Atmospheric Sciences and Climate (CNR-ISAC) (författare)
  • Henzing, BasNetherlands Organisation for Applied Scientific Research (Utrecht) (författare)
  • Keskinen, HelmiUniversity of Helsinki (författare)
  • Sellegri, KarineUniversity of Auvergne (författare)
  • Ovadnevaite, JurgitaNational University of Ireland Galway (författare)
  • Pöhlker, MiraMax Planck Institute for Chemistry (författare)
  • Brito, JoelUniversity of Auvergne,University of São Paulo (författare)
  • Bougiatioti, AikateriniUniversity of Crete (författare)
  • Kristensson, AdamLund University,Lunds universitet,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)nucl-akr (författare)
  • Kalivitis, NikosUniversity of Crete (författare)
  • Stavroulas, IasonasUniversity of Crete (författare)
  • Carbone, SamaraUniversity of São Paulo (författare)
  • Jefferson, AnneNational Oceanic and Atmospheric Administration (NOAA) (författare)
  • Park, MinsuYonsei University (författare)
  • Schlag, PatrickJülich Research Centre,Utrecht University (författare)
  • Iwamoto, YokoHiroshima University,Kanazawa University (författare)
  • Aalto, PasiUniversity of Helsinki (författare)
  • Äijälä, MikkoUniversity of Helsinki (författare)
  • Bukowiecki, NicolasPaul Scherrer Institute (författare)
  • Ehn, MikaelUniversity of Helsinki (författare)
  • Fröhlich, RomanPaul Scherrer Institute (författare)
  • Frumau, ArnoudEnergy Research Centre of the Netherlands (författare)
  • Herrmann, ErikPaul Scherrer Institute (författare)
  • Herrmann, HartmutLeibniz Institute for Tropospheric Research (TROPOS) (författare)
  • Holzinger, RupertUtrecht University (författare)
  • Kos, GerardEnergy Research Centre of the Netherlands (författare)
  • Kulmala, MarkkuUniversity of Helsinki (författare)
  • Mihalopoulos, NikolaosUniversity of Crete,National Observatory of Athens (författare)
  • Nenes, AthanasiosNational Observatory of Athens,Georgia Institute of Technology,Foundation for Research and Technology - Hellas (författare)
  • O'Dowd, ColinNational University of Ireland Galway (författare)
  • Petäjä, TuukkaUniversity of Helsinki (författare)
  • Picard, DavidUniversity of Auvergne (författare)
  • Pöhlker, ChristopherMax Planck Institute for Chemistry (författare)
  • Pöschl, UlrichMax Planck Institute for Chemistry (författare)
  • Poulain, LaurentLeibniz Institute for Tropospheric Research (TROPOS) (författare)
  • Swietlicki, ErikLund University,Lunds universitet,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)nucl-esw (författare)
  • Andreae, MeinratMax Planck Institute for Chemistry (författare)
  • Artaxo, PauloUniversity of São Paulo (författare)
  • Wiedensohler, AlfredLeibniz Institute for Tropospheric Research (TROPOS) (författare)
  • Ogren, JohnNational Oceanic and Atmospheric Administration (NOAA) (författare)
  • Matsuki, AtsushiKanazawa University (författare)
  • Soo Yum, SeongYonsei University (författare)
  • Stratmann, FrankLeibniz Institute for Tropospheric Research (TROPOS) (författare)
  • Baltensperger, UrsPaul Scherrer Institute (författare)
  • Gysel, MartinPaul Scherrer Institute (författare)
  • Frank, GöranLund University,Lunds universitet,MERGE: ModElling the Regional and Global Earth system,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Centre for Environmental and Climate Science (CEC),Faculty of Science,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)nucl-gfr (författare)
  • Paul Scherrer InstituteLeibniz Institute for Tropospheric Research (TROPOS) (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Atmospheric Chemistry and Physics: Copernicus GmbH18:4, s. 2853-28811680-73161680-7324

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