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| Titel |
Near-surface profiles of aerosol number concentration and temperature over the Arctic Ocean |
| VerfasserIn |
A. Held, D. A. Orsini, P. Vaattovaara, M. Tjernström, C. Leck |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 4, no. 8 ; Nr. 4, no. 8 (2011-08-18), S.1603-1616 |
| Datensatznummer |
250002078
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| Publikation (Nr.) |
 copernicus.org/amt-4-1603-2011.pdf |
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| Zusammenfassung |
| Temperature and particle number concentration profiles were measured at
small height intervals above open and frozen leads and snow surfaces in the
central Arctic. The device used was a gradient pole designed to investigate
potential particle sources over the central Arctic Ocean. The collected data
were fitted according to basic logarithmic flux-profile relationships to
calculate the sensible heat flux and particle deposition velocity.
Independent measurements by the eddy covariance technique were conducted at
the same location. General agreement was observed between the two methods
when logarithmic profiles could be fitted to the gradient pole data. In
general, snow surfaces behaved as weak particle sinks with a maximum
deposition velocity vd = 1.3 mm s−1 measured with the gradient
pole. The lead surface behaved as a weak particle source before freeze-up
with an upward flux Fc = 5.7 × 104 particles m−2 s−1, and
as a relatively strong heat source after freeze-up, with an upward maximum
sensible heat flux H = 13.1 W m−2. Over the frozen lead, however, we
were unable to resolve any significant aerosol profiles. |
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