Publication Date:
2016-07-06
Description:
This paper presents the results of measurements of aerosol physical and chemical properties during
iAREA2014 campaign that took place on Svalbard between 15th of Mar and 4th of May 2014. With
respect to field area, the experiment consisted of two sites: NyeÅlesund (78�550N, 11�560E) and Longyearbyen
(78�130N, 15�330E) with further integration of Aerosol Robotic Network (AERONET) station in
Hornsund (77�000N, 15�330E). The subject of this study is to investigate the inesitu, passive and active
remote sensing observations as well as numerical simulations to describe the temporal variability of
aerosol singleescattering properties during spring season on Spitsbergen. The retrieval of the data indicates
several event days with enhanced singleescattering properties due to the existence of sulphate
and additional seaesalt load in the atmosphere which is possibly caused by relatively high wind speed.
Optical results were confirmed by numerical simulations made by the GEMeAQ model and by chemical
observations that indicated up to 45% contribution of the seaesalt to a PM10 total aerosol mass concentration.
An agreement between the in-situ optical and microphysical properties was found, namely:
the positive correlation between aerosol scattering coefficient measured by the nephelometer and
effective radius obtained from laser aerosol spectrometer as well as negative correlation between aerosol
scattering coefficient and the Ångstrom exponent indicated that slightly larger particles dominated
during special events. The inesitu surface observations do not show any significant enhancement of the
absorption coefficient as well as the black carbon concentration which might occur during spring. All of
extensive singleescattering properties indicate a diurnal cycle in Longyearbyen, where 21:00e5:00 data
stays at the background level, however increasing during the day by the factor of 3e4. It is considered to
be highly connected with local emissions originating in combustion, traffic and harbour activities. On the
other hand, no daily fluctuations in NyeÅlesund are observed. Mean values in NyeÅlesund are equal to
8.2, 0.8 Mm�1 and 103 ng/m3 for scattering, absorption coefficients and black carbon concentration; however in Longyearbyen (only data from 21:00e05:00 UTC) they reach 7.9, 0.6 Mm�1 as well as 83 ng/
m3 respectively. Overall, the spring 2014 was considerably clean and seaesalt was the major aerosol
component
Repository Name:
EPIC Alfred Wegener Institut
Type:
Article
,
isiRev
Format:
application/pdf
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