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| Titel |
Microstructure observations during the spring 2011 STRATIPHYT-II cruise in the northeast Atlantic |
| VerfasserIn |
E. Jurado, H. A. Dijkstra, H. J. Woerd |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 8, no. 6 ; Nr. 8, no. 6 (2012-11-07), S.945-957 |
| Datensatznummer |
250006010
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| Publikation (Nr.) |
 copernicus.org/os-8-945-2012.pdf |
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| Zusammenfassung |
| Small-scale temperature and conductivity variations have been
measured in the upper 100 m of the northeast Atlantic
during the STRATIPHYT-II cruise (Las Palmas–Reykjavik, 6
April–3 May 2011). The measurements were done at midday and
comprised 2 to 15 vertical profiles at each station. The derived turbulent
quantities show a transition between weakly-stratified (mixed layer depth, MLD, <100)
and well-mixed waters (MLD > 100), which was centered at about 48° N. The temperature eddy diffusivities, KT,
range from 10−5 to 100 m2 s−1 in the
weakly-stratified stations, and range from 3 × 10−4 to
2 × 100 m2 s−1 in the well-mixed
stations. The turbulent kinetic energy dissipation rates,
ε, range from 3 × 10−8 to
2 × 10−6 m2 s−3 south of the transition
zone, and from 10−7 to 10−5 m2 s−3
north of the transition zone. The station-averaged KT values throughout the
mixed layer increase exponentially with the wind speed. The station-averaged
ε values throughout the mixed layer scale with the wind
stress similarity variable with a scaling factor of about 1.8 in the
wind-dominated stations (ε ≈ 1.8 u☆3/(−κz)). The values of KT and
ε are on average 10 times higher compared to the values
measured at the same stations in July 2009. The results
presented here constitute a unique data set giving large
spatial coverage of upper ocean spring turbulence quantities. |
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