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http://www.atmos-chem-phys-discuss.net/7/2275/2007/acpd-7-2275-2007.pdf
2275
2324
2007-02-16
Arctic smoke – aerosol characteristics during a record air pollution event in the European Arctic and its radiative impact
R. Treffeisen
renate.treffeisen@awi.de
P. Turnved
J. Ström
A. Herber
J. Bareiss
A. Helbig
R. S. Stone
W. Hoyningen-Huene
R. Krejci
A. Stohl
R. Neuber
Alfred Wegner Institute for Polar and Marine Research, Telegrafenberg A45, 14473 Potsdam, Germany
ITM – Department of Applied Environmental Science, Stockholm University, S 106 91 Stockholm, Sweden
Alfred Wegner Institute for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany
University of Trier, Department of Climatology, 54286 Trier, Germany
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder 80309
Univ. of Bremen, Institute of Environmental Physics, Otto-Hahn-Allee 1, 28334 Bremen, Germany
Department of Meteorology (MISU), Stockholm University, S 106 91 Stockholm, Sweden
Norwegian Institute for Air Research, Instituttveien 18, 2027 Kjeller, Norway
In early May 2006 a record high air pollution event was observed at
Ny-Ålesund, Spitsbergen. An atypical weather pattern established a
pathway for the rapid transport of biomass burning aerosols from
agricultural fires in Eastern Europe to the Arctic. Atmospheric stability
was such that the smoke was constrained to low levels, within 2 km of the
surface during the transport. A description of this smoke event in terms of
transport and main aerosol characteristics can be found in Stohl et al. (2007). This study puts emphasis on the radiative effect of the smoke. The
aerosol size distribution was characterized as having an accumulation mode
centered at 165–185 nm and almost 1.6 for geometric standard deviation of
the mode. Nucleation and small Aitken mode particles were almost completely
suppressed within the smoke plume measured at Ny-Ålesund. Chemical and
microphysical aerosol information obtained at Mt. Zeppelin (474 m.a.s.l) was
used to derive input parameters for a one-dimensional radiation transfer
model to explore the radiative effects of the smoke. The daily mean heating
rate calculated on 2 May 2006 for the average size distribution and measured
chemical composition reached 0.55 K day<sup>−1</sup> at 0.5 km altitude for the
assumed external mixture of the aerosols but showing much higher heating
rates for an internal mixture (1.7 K day<sup>−1</sup>). In comparison a case study
for March 2000 showed that the local climatic effects due to Arctic haze,
using a regional climate model, HIRHAM, amounts to a maximum of 0.3 K day<sup>−1</sup> of heating at 2 km altitude (Treffeisen et al., 2005).
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