Institutional Research Information Service
UCL Logo
Please report any queries concerning the funding data grouped in the sections named "Externally Awarded" or "Internally Disbursed" (shown on the profile page) to your Research Finance Administrator. Your can find your Research Finance Administrator at https://www.ucl.ac.uk/finance/research/rs-contacts.php by entering your department
Please report any queries concerning the student data shown on the profile page to:

Email: portico-services@ucl.ac.uk

Help Desk: http://www.ucl.ac.uk/ras/portico/helpdesk
Publication Detail
Chemical transport models often underestimate inorganic aerosol acidity in remote regions of the atmosphere
  • Publication Type:
    Journal article
  • Authors:
    Nault BA, Campuzano-Jost P, Day DA, Jo DS, Schroder JC, Allen HM, Bahreini R, Bian H, Blake DR, Chin M, Clegg SL, Colarco PR, Crounse JD, Cubison MJ, DeCarlo PF, Dibb JE, Diskin GS, Hodzic A, Hu W, Katich JM, Kim MJ, Kodros JK, Kupc A, Lopez-Hilfiker FD, Marais EA, Middlebrook AM, Neuman JA, Nowak JB, Palm BB, Paulot F, Pierce JR, Schill GP, Scheuer E, Thornton JA, Tsigaridis K, Wennberg PO, Williamson CJ, Jimenez JL
  • Publisher:
  • Publication date:
  • Journal:
    Communications Earth & Environment
  • Volume:
  • Article number:
  • Status:
  • Language:
  • Keywords:
    Atmospheric chemistry, Climate and Earth system modelling, Environmental chemistry
The inorganic fraction of fine particles affects numerous physicochemical processes in the atmosphere. However, there is large uncertainty in its burden and composition due to limited global measurements. Here, we present observations from eleven different aircraft campaigns from around the globe and investigate how aerosol pH and ammonium balance change from polluted to remote regions, such as over the oceans. Both parameters show increasing acidity with remoteness, at all altitudes, with pH decreasing from about 3 to about −1 and ammonium balance decreasing from almost 1 to nearly 0. We compare these observations against nine widely used chemical transport models and find that the simulations show more scatter (generally R2 < 0.50) and typically predict less acidic aerosol in the most remote regions. These differences in observations and predictions are likely to result in underestimating the model-predicted direct radiative cooling effect for sulfate, nitrate, and ammonium aerosol by 15–39%.
Publication data is maintained in RPS. Visit https://rps.ucl.ac.uk
 More search options
UCL Researchers
Dept of Geography
University College London - Gower Street - London - WC1E 6BT Tel:+44 (0)20 7679 2000

© UCL 1999–2011

Search by