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The size dependent composition of fog droplets

Laj, Paolo ; Fuzzi, Sandro ; Lazzari, Alberto ; Ricci, Loretta ; Orsi, Giordano ; Berner, Axel ; Dusek, Ulrike ; Schell, Dieter ; Günther, Armin and Wendisch, Manfred , et al. (1998) In Contributions to Atmospheric Physics 71(1). p.115-130
Abstract

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... (More)

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.

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Contributions to Atmospheric Physics
volume
71
issue
1
pages
16 pages
publisher
Deutsche Meteorologische Gesellschaft / Friedr. Vieweg & Sohn Verlagsgesellschaft mbh
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  • scopus:0031749130
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0005-8173
language
English
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8a0060e7-f68f-4bf9-8994-75717e409af9
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2019-05-16 09:11:29
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2019-11-25 09:30:04
@article{8a0060e7-f68f-4bf9-8994-75717e409af9,
  abstract     = {<p>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 HNO<sub>3</sub> and NH<sub>3</sub>. 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.</p>},
  author       = {Laj, Paolo and Fuzzi, Sandro and Lazzari, Alberto and Ricci, Loretta and Orsi, Giordano and Berner, Axel and Dusek, Ulrike and Schell, Dieter and Günther, Armin and Wendisch, Manfred and Wobrock, Wolfram and Frank, Göran and Martinsson, Bengt G. and Hillamo, Risto},
  issn         = {0005-8173},
  language     = {eng},
  month        = {02},
  number       = {1},
  pages        = {115--130},
  publisher    = {Deutsche Meteorologische Gesellschaft / Friedr. Vieweg & Sohn Verlagsgesellschaft mbh},
  series       = {Contributions to Atmospheric Physics},
  title        = {The size dependent composition of fog droplets},
  volume       = {71},
  year         = {1998},
}