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| Titel |
Atmospheric black carbon and sulfate concentrations in Northeast Greenland |
| VerfasserIn |
A. Maßling, I. E. Nielsen, D. Kristensen, J. H. Christensen, L. L. Sørensen, B. Jensen, Q. T. Nguyen, J. K. Nøjgaard, M. Glasius, H. Skov |
| 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 ; 15, no. 16 ; Nr. 15, no. 16 (2015-08-28), S.9681-9692 |
| Datensatznummer |
250120001
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| Publikation (Nr.) |
 copernicus.org/acp-15-9681-2015.pdf |
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| Zusammenfassung |
Measurements of equivalent black carbon (EBC) in aerosols at the high Arctic
field site Villum Research Station (VRS) at Station Nord in North Greenland
showed a seasonal variation in EBC concentrations with a maximum in winter
and spring at ground level. Average measured concentrations were about
0.067 ± 0.071 for the winter and 0.011 ± 0.009 for the summer
period. These data were obtained using a multi-angle absorption photometer
(MAAP). A similar seasonal pattern was found for sulfate concentrations with
a maximum level during winter and spring analyzed by ion chromatography.
Here, measured average concentrations were about 0.485 ± 0.397 for the
winter and 0.112 ± 0.072 for the summer period. A correlation between
EBC and sulfate concentrations was observed over the years 2011 to 2013
stating a correlation coefficient of R2 = 0.72. This finding gives the
hint that most likely transport of primary emitted BC particles to the Arctic
was accompanied by aging of the aerosols through condensational processes. BC
and sulfate are known to have only partly similar sources with respect to
their transport pathways when reaching the high Arctic. Aging processes may
have led to the formation of secondary inorganic matter and further transport
of BC particles as cloud processing and further washout of particles is less
likely based on the typically observed transport patterns of air masses
arriving at VRS. Additionally, concentrations of EC (elemental carbon) based
on a thermo-optical method were determined and compared to EBC measurements.
EBC measurements were generally higher, but a correlation between EC and EBC
resulted in a correlation coefficient of R2 = 0.64.
Model estimates of the climate forcing due to BC in the Arctic are based on
contributions of long-range transported BC during spring and summer. The
measured concentrations were here compared with model results obtained by the
Danish Eulerian Hemispheric Model, DEHM. Good agreement between measured and modeled
concentrations of both EBC/BC and sulfate was observed. Also, the correlation
between BC and sulfate concentrations was confirmed based on the model
results observed over the years 2011 to 2013 stating a correlation
coefficient of R2 = 0.74. The dominant source is found to be combustion
of fossil fuel with biomass burning as a minor, albeit significant source. |
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