The size dependent composition of fog droplets

Laj, PaoloCNR Istituto per le Tecnologie Applicate ai Beni Culturali (CNR-ITABC) (författare)

The size dependency of fog droplet concentration and composition was studied using newly developed droplet impactors during the CHEMDROP campaign in the Po Valley (Italy). A strong size dependency of solute concentrations was measured during several fog episodes. The ionic strength of the droplet solutions varies as a function of droplet diameter, showing maximum values in the 9-19 μm diameter range. The solute concentration varies up to a factor of 10 among droplets of different diameter. Similarly, differences of up to 2 pH units are found among droplets of different diameter. The solute dependency of aerosol and droplets species from 0.1 μm to 50 μm is investigated. The monomodal behaviour of the solute concentration in droplets can be explained by both diffusional condensation of the aerosols serving as cloud condensation nuclei (CCN) and the air/liquid transfer of volatile species, in particular for HNO3 and NH3. The distribution of sulphur species is also size-dependent and is directly linked to the pH variations across the droplet spectrum, resulting in HMSA formation in small droplets and S(IV) oxidation large droplets.

Fuzzi, SandroCNR Istituto per le Tecnologie Applicate ai Beni Culturali (CNR-ITABC) (författare)
Lazzari, AlbertoCNR Istituto per le Tecnologie Applicate ai Beni Culturali (CNR-ITABC) (författare)
Ricci, LorettaCNR Istituto per le Tecnologie Applicate ai Beni Culturali (CNR-ITABC) (författare)
Orsi, GiordanoCNR Istituto per le Tecnologie Applicate ai Beni Culturali (CNR-ITABC) (författare)
Berner, AxelUniversity of Vienna (författare)
Dusek, UlrikeUniversity of Vienna (författare)
Schell, DieterGoethe University (författare)
Günther, ArminGoethe University (författare)
Wendisch, ManfredLeibniz Institute for Tropospheric Research (TROPOS) (författare)
Wobrock, WolframLaboratoire de Méteorologie Physique (LaMP-CNRS) (författare)
Frank, GöranLund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)nucl-gfr (författare)
Martinsson, Bengt G.Lund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)nucl-bma (författare)
Hillamo, RistoFinnish Meteorological Institute (författare)
CNR Istituto per le Tecnologie Applicate ai Beni Culturali (CNR-ITABC)University of Vienna (creator_code:org_t)

Av författaren/redakt...: Laj, Paolo; Fuzzi, Sandro; Lazzari, Alberto; Ricci, Loretta; Orsi, Giordano; Berner, Axel; visa fler...; Dusek, Ulrike; Schell, Dieter; Günther, Armin; Wendisch, Manfre ...; Wobrock, Wolfram; Frank, Göran; Martinsson, Beng ...; Hillamo, Risto; visa färre...

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