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  • Shepherd, Rosalie H.STFC Rutherford Appleton Lab, Res Complex Harwell, Cent Laser Facil, Oxford OX11 0FA, England.;Royal Holloway Univ London, Dept Earth Sci, Egham TW20 0EX, Surrey, England. (författare)

Measurement of gas-phase OH radical oxidation and film thickness of organic films at the air-water interface using material extracted from urban, remote and wood smoke aerosol

  • Artikel/kapitelEngelska2022

Förlag, utgivningsår, omfång ...

  • 2022
  • Royal Society of Chemistry (RSC),2022
  • electronicrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:uu-481772
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-481772URI
  • https://doi.org/10.1039/d2ea00013jDOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

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

Anmärkningar

  • The presence of an organic film on a cloud droplet or aqueous aerosol particle has the potential to alter the chemical, optical and physical properties of the droplet or particle. In the study presented, water insoluble organic materials extracted from urban, remote (Antarctica) and wood burning atmospheric aerosol were found to have stable, compressible, films at the air-water interface that were typically similar to 6-18 angstrom thick. These films are reactive towards gas-phase OH radicals and decay exponentially, with bimolecular rate constants for reaction with gas-phase OH radicals of typically 0.08-1.5 x 10(-10) cm(3) molecule(-1) s(-1). These bimolecular rate constants equate to initial OH radical uptake coefficients estimated to be similar to 0.6-1 except woodsmoke (similar to 0.05). The film thickness and the neutron scattering length density of the extracted atmosphere aerosol material (from urban, remote and wood burning) were measured by neutron reflection as they were exposed to OH radicals. For the first time neutron reflection has been demonstrated as an excellent technique for studying the thin films formed at air-water interfaces from materials extracted from atmospheric aerosol samples. Additionally, the kinetics of gas-phase OH radicals with a proxy compound, the lipid 1,2-distearoyl-sn-glycero-3-phosphocholine (DSPC) was studied displaying significantly different behaviour, thus demonstrating it is not a good proxy for atmospheric materials that may form films at the air-water interface. The atmospheric lifetimes, with respect to OH radical oxidation, of the insoluble organic materials extracted from atmospheric aerosol at the air-water interface were a few hours. Relative to a possible physical atmospheric lifetime of 4 days, the oxidation of these films is important and needs inclusion in atmospheric models. The optical properties of these films were previously reported [Shepherd et al., Atmos. Chem. Phys., 2018, 18, 5235-5252] and there is a significant change in top of the atmosphere albedo for these thin films on core-shell atmospheric aerosol using the film thickness data and confirmation of stable film formation at the air-water interface presented here.

Ämnesord och genrebeteckningar

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

  • King, Martin D.Royal Holloway Univ London, Dept Earth Sci, Egham TW20 0EX, Surrey, England. (författare)
  • Rennie, Adrian R.,1957-Uppsala universitet,Institutionen för kemi - Ångström,Makromolekylär kemi(Swepub:uu)adren227 (författare)
  • Ward, Andrew D.STFC Rutherford Appleton Lab, Res Complex Harwell, Cent Laser Facil, Oxford OX11 0FA, England. (författare)
  • Frey, Markus M.British Antarctic Survey, Nat Environm Res Council, High Cross,Madingley Rd, Cambridge CB3 0ET, England. (författare)
  • Brough, NeilBritish Antarctic Survey, Nat Environm Res Council, High Cross,Madingley Rd, Cambridge CB3 0ET, England. (författare)
  • Eveson, JoshuaBritish Antarctic Survey, Nat Environm Res Council, High Cross,Madingley Rd, Cambridge CB3 0ET, England. (författare)
  • Del Vento, SabinoBritish Antarctic Survey, Nat Environm Res Council, High Cross,Madingley Rd, Cambridge CB3 0ET, England. (författare)
  • Milsom, AdamUniv Birmingham, Sch Geog Earth & Environm Sci, Birmingham B15 2TT, W Midlands, England. (författare)
  • Pfrang, ChristianUniv Birmingham, Sch Geog Earth & Environm Sci, Birmingham B15 2TT, W Midlands, England. (författare)
  • Skoda, Maximilian W. A.Rutherford Appleton Lab, ISIS Pulsed Neutron & Muon Source, Oxford OX11 0QX, England. (författare)
  • Welbourn, Rebecca J. L.Rutherford Appleton Lab, ISIS Pulsed Neutron & Muon Source, Oxford OX11 0QX, England. (författare)
  • STFC Rutherford Appleton Lab, Res Complex Harwell, Cent Laser Facil, Oxford OX11 0FA, England.;Royal Holloway Univ London, Dept Earth Sci, Egham TW20 0EX, Surrey, England.Royal Holloway Univ London, Dept Earth Sci, Egham TW20 0EX, Surrey, England. (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Environmental Science: Royal Society of Chemistry (RSC)2:4, s. 574-5902634-3606

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