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

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

Schmale, Julia (författare): Paul Scherrer Institute

Henning, Silvia (författare): Leibniz Institute for Tropospheric Research (TROPOS)

Decesari, Stefano (författare): CNR Institute of Atmospheric Sciences and Climate (CNR-ISAC)

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Henzing, Bas (författare): Netherlands Organisation for Applied Scientific Research (Utrecht)

Keskinen, Helmi (författare): University of Helsinki

Sellegri, Karine (författare): University of Auvergne

Ovadnevaite, Jurgita (författare): National University of Ireland Galway

Pöhlker, Mira (författare): Max Planck Institute for Chemistry

Brito, Joel (författare): University of Auvergne,University of São Paulo

Bougiatioti, Aikaterini (författare): University of Crete

Kristensson, Adam (författare): Lund University,Lunds universitet,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Physics,Departments at LTH,Faculty of Engineering, LTH

Kalivitis, Nikos (författare): University of Crete

Stavroulas, Iasonas (författare): University of Crete

Carbone, Samara (författare): University of São Paulo

Jefferson, Anne (författare): National Oceanic and Atmospheric Administration (NOAA)

Park, Minsu (författare): Yonsei University

Schlag, Patrick (författare): Jülich Research Centre,Utrecht University

Iwamoto, Yoko (författare): Hiroshima University,Kanazawa University

Aalto, Pasi (författare): University of Helsinki

Äijälä, Mikko (författare): University of Helsinki

Bukowiecki, Nicolas (författare): Paul Scherrer Institute

Ehn, Mikael (författare): University of Helsinki

Fröhlich, Roman (författare): Paul Scherrer Institute

Frumau, Arnoud (författare): Energy Research Centre of the Netherlands

Herrmann, Erik (författare): Paul Scherrer Institute

Herrmann, Hartmut (författare): Leibniz Institute for Tropospheric Research (TROPOS)

Holzinger, Rupert (författare): Utrecht University

Kos, Gerard (författare): Energy Research Centre of the Netherlands

Kulmala, Markku (författare): University of Helsinki

Mihalopoulos, Nikolaos (författare): University of Crete,National Observatory of Athens

Nenes, Athanasios (författare): National Observatory of Athens,Georgia Institute of Technology,Foundation for Research and Technology - Hellas

O'Dowd, Colin (författare): National University of Ireland Galway

Petäjä, Tuukka (författare): University of Helsinki

Picard, David (författare): University of Auvergne

Pöhlker, Christopher (författare): Max Planck Institute for Chemistry

Pöschl, Ulrich (författare): Max Planck Institute for Chemistry

Poulain, Laurent (författare): Leibniz Institute for Tropospheric Research (TROPOS)

Swietlicki, Erik (författare): Lund University,Lunds universitet,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Physics,Departments at LTH,Faculty of Engineering, LTH

Andreae, Meinrat (författare): Max Planck Institute for Chemistry

Artaxo, Paulo (författare): University of São Paulo

Wiedensohler, Alfred (författare): Leibniz Institute for Tropospheric Research (TROPOS)

Ogren, John (författare): National Oceanic and Atmospheric Administration (NOAA)

Matsuki, Atsushi (författare): Kanazawa University

Soo Yum, Seong (författare): Yonsei University

Stratmann, Frank (författare): Leibniz Institute for Tropospheric Research (TROPOS)

Baltensperger, Urs (författare): Paul Scherrer Institute

Gysel, Martin (författare): Paul Scherrer Institute

Frank, Göran (författare): Lund 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

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2018-02-28
2018
Engelska 29 s.
Ingår i: Atmospheric Chemistry and Physics. - : Copernicus GmbH. - 1680-7316 .- 1680-7324. ; 18:4, s. 2853-2881

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Tidskriftsartikel (refereegranskat)

Abstract Ämnesord

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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.

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Av författaren/redakt...: Schmale, Julia; Henning, Silvia; Decesari, Stefan ...; Henzing, Bas; Keskinen, Helmi; Sellegri, Karine; visa fler...; Ovadnevaite, Jur ...; Pöhlker, Mira; Brito, Joel; Bougiatioti, Aik ...; Kristensson, Ada ...; Kalivitis, Nikos; Stavroulas, Iaso ...; Carbone, Samara; Jefferson, Anne; Park, Minsu; Schlag, Patrick; Iwamoto, Yoko; Aalto, Pasi; Äijälä, Mikko; Bukowiecki, Nico ...; Ehn, Mikael; Fröhlich, Roman; Frumau, Arnoud; Herrmann, Erik; Herrmann, Hartmu ...; Holzinger, Ruper ...; Kos, Gerard; Kulmala, Markku; Mihalopoulos, Ni ...; Nenes, Athanasio ...; O'Dowd, Colin; Petäjä, Tuukka; Picard, David; Pöhlker, Christo ...; Pöschl, Ulrich; Poulain, Laurent; Swietlicki, Erik; Andreae, Meinrat; Artaxo, Paulo; Wiedensohler, Al ...; Ogren, John; Matsuki, Atsushi; Soo Yum, Seong; Stratmann, Frank; Baltensperger, U ...; Gysel, Martin; Frank, Göran; visa färre...

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Av lärosätet: Lunds universitet

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

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