TITLE

Observations of the evolution of particulate in an urban plume and following interaction with cloud

AUTHOR(S)
Bower, Keith N.; Flynn, M. J.; Choularton, T. W.; Burgess, R. A.; Coe, H.; Swietlicki, E.; Martinsson, B.; Zhou, J.; Wiedensohler, A.; Birmilli, W.; Mu¨ller, K.; Berner, A.
PUB. DATE
August 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 534 Issue 1, p631
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
An investigation into the characteristics of aerosol produced in city center Manchester, and the evolution of such aerosol as they advect out of the city and pass over the Pennines. Measurements were made of aerosol properties within the city and at three sites to the east of the city, including a site at the top of Holme Moss which is often in cloud. These measurements showed strong correlation between particle number and traffic flow within the city. Outside the city as the airmass advected over the Pennines it was observed that the particles were a mixture of sulphates, nitrates, chlorides, and organics, and that most were only weakly hygroscopic. Hence despite the high number of aerosol present, few were effective as CCN and the number of cloud droplets formed was limited in most cases to about 600cm[sup -3]. This was in contrast to the ACE-2 experiment where a much more aged plume from Western Europe was sampled on Tenerife, and droplet numbers of up to 2800cm[sup -3] were observed. More work is needed to establish the details of the aging process responsible for these changes in hygroscopicity.
ACCESSION #
5669683

 

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