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| Titel |
Summer upwelling at the Boknis Eck time-series station (1982 to 2012) – a combined glider and wind data analysis |
| VerfasserIn |
J. Karstensen, T. Liblik, J. Fischer, K. Bumke, G. Krahmann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 13 ; Nr. 11, no. 13 (2014-07-04), S.3603-3617 |
| Datensatznummer |
250117505
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| Publikation (Nr.) |
 copernicus.org/bg-11-3603-2014.pdf |
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| Zusammenfassung |
| Two consecutive summer upwelling events, each lasting for less than 24 h,
were surveyed in high temporal and vertical resolution close to the Boknis
Eck time-series station (BE) in the western Belt Sea (Baltic Sea) in summer
2010 with an autonomous glider. Driven only by moderate offshore winds both
events resulted in more than 5 K cooling of surface waters, while only for
the second event were significant irreversible changes in the vertical
stratification observed. Generalizing the glider survey observations
with hourly wind data from nearby meteorological stations, it is found that
upwelling in the BE area occurs for wind directions between 190 to
260° and wind speed exceeding 4 m s−1. Based on these
thresholds the wind-induced summer (June to September) upwelling conditions
in the BE area for the period 1982 to 2012 are reconstructed. On average
about 18 days of upwelling favourable wind conditions are found for the four
summer months, with significant interannual variability ranging from 7.7 days
(2006) to more than 28 days (1985). By aligning upwelling favourable wind
conditions with the monthly BE surveys it is found that extreme anomalies in
BE surveys follow extended periods of upwelling favourable winds. |
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