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| Titel |
Aerosol measurements at the Gual Pahari EUCAARI station: preliminary results from in-situ measurements |
| VerfasserIn |
A.-P. Hyvärinen, H. Lihavainen, M. Komppula, T. S. Panwar, V. P. Sharma, R. K. Hooda, Y. Viisanen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 15 ; Nr. 10, no. 15 (2010-08-06), S.7241-7252 |
| Datensatznummer |
250008683
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| Publikation (Nr.) |
 copernicus.org/acp-10-7241-2010.pdf |
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| Zusammenfassung |
| The Finnish Meteorological Institute (FMI), together with The Energy and
Resources Institute of India (TERI), contributed to the European Integrated
project on Aerosol Cloud Climate and Air Quality Interactions, EUCAARI, by
conducting aerosol measurements in Gual Pahari, India, from December 2007 to
January 2010. This paper describes the station setup in detail for the first
time and provides results from the aerosol in-situ measurements, which
include PM and BCe masses, aerosol size distribution from 4 nm to 10 μm,
and the scattering and absorption coefficients. The seasonal variation of
the aerosol characteristics was very distinct in Gual Pahari. The highest
concentrations were observed during the winter and the lowest during the
rainy season. The average PM10 concentration (at STP conditions) was
216 μgm−3 and the average PM2.5 concentration was 126 μgm−3.
A high percentage (4–9%) of the PM10 mass consisted of
BCe which indicates anthropogenic influence. The percentage of BCe was higher
during the winter; and according to the diurnal pattern of the BCe fraction,
the peak occurred during active traffic hours. Another important
source of aerosol particles in the area was new particle formation. The
nucleated particles grew rapidly reaching the Aitken and accumulation mode
size, thus contributing considerably to the aerosol load. The rainy season
decreased the average fraction of particle mass in the PM2.5 size
range, i.e. of secondary origin. The other mechanism decreasing the surface
concentrations was based on convective mixing and boundary layer
evolution. This diluted the aerosol when sun radiation and the temperature
was high, i.e. especially during the pre-monsoon day time. The lighter and
smaller particles were more effectively diluted. |
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