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  Planetary boundary layer height modulates aerosol - water interactions during winter in the megacity of Delhi

Raj, S. S., Krüger, O. O., Sharma, A., Panda, U., Pöhlker, C., Walter, D., et al. (2021). Planetary boundary layer height modulates aerosol - water interactions during winter in the megacity of Delhi. doi:10.1002/essoar.10506835.1.

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This preprint has been submitted to and is under consideration at Journal of Geophysical Research - Atmospheres

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 Creators:
Raj, Subha S, Author
Krüger, Ovid O.1, Author              
Sharma, Amit, Author
Panda, Upasana, Author
Pöhlker, Christopher1, Author              
Walter, David1, Author              
Förster, Jan-David1, Author              
Singh, Rishi Pal, Author
S , Swetha, Author
Klimach, Thomas1, Author              
Darbyshire, Eoghan, Author
Martin, Scot T., Author
McFiggans, Gordon, Author
Coe, Hugh, Author
Allan, James D, Author
R, Ravikrishna, Author
Soni, Vijay Kumar, Author
Su, Hang1, Author              
Andreae, Meinrat O.1, Author              
Pöschl, Ulrich1, Author              
Pöhlker, Mira L.1, Author              Gunthe, Sachin S., Author more..
Affiliations:
1Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              

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 Abstract: The Indo-Gangetic Plain is one of the largest sources of air pollution worldwide, and throughout winter strong fluctuations in the planetary boundary layer (PBL) height, driven by a strong radiative thermal inversion, affect the dispersion of this pollution. To date, tie-ins into aerosol-water vapour interactions, especially cloud condensation nuclei (CCN) activity, and the associated implications for aerosol indirect effects and hence on regional and global climate have been little studied. We present the results of a one-month field campaign (February-March 2018) in the polluted megacity of Delhi. The composition of fine particulate matter (PM1) and size-resolved CCN properties were measured over a wide range of water vapour supersaturations. PBL modelling, backward trajectories, and fire spots were included in the analysis to elucidate the influence of PBL and air mass origins on the aerosols. The aerosol properties depended strongly on the PBL height, with enhanced PM1 concentrations, high mass fractions of organic matter and BC, and low aerosol hygroscopicity during time periods of low PBL height (<100m). The observed correlations of PM1, aerosol particle number and CCN number with PBL height were parameterized by simple power law fit. Changes in PBL height induced changes in aerosol accumulation and aging processes, as manifested in aerosol composition and hygroscopicity. In contrast, aerosol properties did not depend strongly on air mass origins or wind direction, implying that the observed aerosol and CCN represented local emissions. The relationship between CCN number and supersaturation was well described by an error function parameterization.

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Language(s): eng - English
 Dates: 2021-04-20
 Publication Status: Published online
 Pages: 24
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: DOI: 10.1002/essoar.10506835.1
 Degree: -

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