Journal article

Airborne measurements of nucleation mode particles I: coastal nucleation and growth rates

O’Dowd C, Yoon Y, Junkerman W, Aalto P, Kulmala M, Lihavainen H, Viisanen Y ...see all

Atmospheric Chemistry and Physics Discussions, vol. 6, issue 4 (2006) pp. 8097-8123

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Abstract

A light aircraft was equipped with a bank of Condensation Particle
Counters (CPCs) (50% cut from 3�5.4�9.6 nm) and a nano-Scanning Mobility
Particle Sizer (nSMPS) and deployed along the west coast of Ireland,
in the vicinity of Mace Head. The objective of the exercise was to
provide high resolution micro-physical measurements of the coastal
nucleation mode in order to map the spatial extent of new particle
production regions and to evaluate the evolution, and associated
growth rates of the coastal nucleation-mode aerosol plume. Results
indicate that coastal new particle production is occurring over most
areas along the land-sea interface with peak concentrations at the
coastal plume-head in excess of 106 cm-3. Pseudo-Lagrangian studies
of the coastal plume evolution illustrated significant growth of
new particles to sizes in excess of 8 nm approximately 10 km downwind
of the source region. Close to the plume head (can be as high as 123�171 nm h-1, decreasing gradually to 53�72 nm
h-1 at 3 km. Further along the plume, at distances up to 10 km, the
growth rates are calculated to be 17�32 nm h-1. Growth rates of this
magnitude suggest that after a couple of hours, coastal nucleation
mode particles can reach significant sizes where they can contribution
to the regional aerosol loading.

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Authors

  • C. D. O’Dowd

  • Y. J. Yoon

  • W. Junkerman

  • P. Aalto

  • M. Kulmala

  • H. Lihavainen

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