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Observation of the suppression of water uptake by marine particles

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Title: Observation of the suppression of water uptake by marine particles
Authors: Modini, Robin L.1 r.modini@student.qut.edu.au, Johnson, Graham R.1 g.johnson@qut.edu.au, He, Congrong1 c.he@qut.edu.au, Ristovski, Zoran D. z.ristovski@qut.edu.au
Source: Atmospheric Research. Nov2010, Vol. 98 Issue 2-4, p219-228. 10p.
Subjects: Aerosols, Humidity control, Evaporation (Meteorology), Thin films, Atmospheric nucleation, Temperature control, Condensation (Meteorology)
Geographic Terms: Pacific Coast (Qld.), Queensland
Abstract: Abstract: A 4week intensive measurement campaign was conducted in March–April 2007 at Agnes Water, a remote coastal site on the east coast of Australia. A Volatility-Hygroscopicity-Tandem Differential Mobility Analyser (VH-TDMA) was used to investigate changes in the hygroscopic properties of ambient particles as volatile components were progressively evaporated. Nine out of 18 VH-TDMA volatility scans detected internally mixed multi-component particles in the nucleation and Aitken modes in clean marine air. Evaporation of a volatile, organic-like component in the VH-TDMA caused significant increases in particle hygroscopicity. In 3 scans the increase in hygroscopicity was so large it was explained by an increase in the absolute volume of water uptake by the particle residuals, and not merely an increase in their relative hygroscopicity. This indicates the presence of organic components that were suppressing the hygroscopic growth of mixed particles on the timescale of humidification in the VH-TDMA (6.5secs). This observation was supported by ZSR calculations for one scan, which showed that the measured growth factors of mixed particles were up to 18% below those predicted assuming independent water uptake of the individual particle components. The observed suppression of water uptake could be due to a reduced rate of hygroscopic growth caused by the presence of organic films or organic-inorganic interactions in solution droplets that had a negative effect on hygroscopicity. [Copyright &y& Elsevier]
Copyright of Atmospheric Research is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 55056115
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Observation of the suppression of water uptake by marine particles
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  Data: <searchLink fieldCode="AR" term="%22Modini%2C+Robin+L%2E%22">Modini, Robin L.</searchLink><relatesTo>1</relatesTo><i> r.modini@student.qut.edu.au</i><br /><searchLink fieldCode="AR" term="%22Johnson%2C+Graham+R%2E%22">Johnson, Graham R.</searchLink><relatesTo>1</relatesTo><i> g.johnson@qut.edu.au</i><br /><searchLink fieldCode="AR" term="%22He%2C+Congrong%22">He, Congrong</searchLink><relatesTo>1</relatesTo><i> c.he@qut.edu.au</i><br /><searchLink fieldCode="AR" term="%22Ristovski%2C+Zoran+D%2E%22">Ristovski, Zoran D.</searchLink><i> z.ristovski@qut.edu.au</i>
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  Data: <searchLink fieldCode="JN" term="%22Atmospheric+Research%22">Atmospheric Research</searchLink>. Nov2010, Vol. 98 Issue 2-4, p219-228. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Aerosols%22">Aerosols</searchLink><br /><searchLink fieldCode="DE" term="%22Humidity+control%22">Humidity control</searchLink><br /><searchLink fieldCode="DE" term="%22Evaporation+%28Meteorology%29%22">Evaporation (Meteorology)</searchLink><br /><searchLink fieldCode="DE" term="%22Thin+films%22">Thin films</searchLink><br /><searchLink fieldCode="DE" term="%22Atmospheric+nucleation%22">Atmospheric nucleation</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+control%22">Temperature control</searchLink><br /><searchLink fieldCode="DE" term="%22Condensation+%28Meteorology%29%22">Condensation (Meteorology)</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Pacific+Coast+%28Qld%2E%29%22">Pacific Coast (Qld.)</searchLink><br /><searchLink fieldCode="DE" term="%22Queensland%22">Queensland</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract: A 4week intensive measurement campaign was conducted in March–April 2007 at Agnes Water, a remote coastal site on the east coast of Australia. A Volatility-Hygroscopicity-Tandem Differential Mobility Analyser (VH-TDMA) was used to investigate changes in the hygroscopic properties of ambient particles as volatile components were progressively evaporated. Nine out of 18 VH-TDMA volatility scans detected internally mixed multi-component particles in the nucleation and Aitken modes in clean marine air. Evaporation of a volatile, organic-like component in the VH-TDMA caused significant increases in particle hygroscopicity. In 3 scans the increase in hygroscopicity was so large it was explained by an increase in the absolute volume of water uptake by the particle residuals, and not merely an increase in their relative hygroscopicity. This indicates the presence of organic components that were suppressing the hygroscopic growth of mixed particles on the timescale of humidification in the VH-TDMA (6.5secs). This observation was supported by ZSR calculations for one scan, which showed that the measured growth factors of mixed particles were up to 18% below those predicted assuming independent water uptake of the individual particle components. The observed suppression of water uptake could be due to a reduced rate of hygroscopic growth caused by the presence of organic films or organic-inorganic interactions in solution droplets that had a negative effect on hygroscopicity. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Atmospheric Research is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.atmosres.2010.03.025
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 10
        StartPage: 219
    Subjects:
      – SubjectFull: Aerosols
        Type: general
      – SubjectFull: Humidity control
        Type: general
      – SubjectFull: Evaporation (Meteorology)
        Type: general
      – SubjectFull: Thin films
        Type: general
      – SubjectFull: Atmospheric nucleation
        Type: general
      – SubjectFull: Temperature control
        Type: general
      – SubjectFull: Condensation (Meteorology)
        Type: general
      – SubjectFull: Pacific Coast (Qld.)
        Type: general
      – SubjectFull: Queensland
        Type: general
    Titles:
      – TitleFull: Observation of the suppression of water uptake by marine particles
        Type: main
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          Name:
            NameFull: Modini, Robin L.
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            NameFull: Johnson, Graham R.
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            NameFull: He, Congrong
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            NameFull: Ristovski, Zoran D.
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            – D: 01
              M: 11
              Text: Nov2010
              Type: published
              Y: 2010
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              Value: 01698095
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              Value: 98
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              Value: 2-4
          Titles:
            – TitleFull: Atmospheric Research
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