Title:
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Microstructure observations during the spring 2011 STRATIPHYT-II cruise in the northeast Atlantic
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Author:
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Jurado Cojo, Elena; Dijkstra, Henk A.; van der Woerd, Hendrik Jan
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Other authors:
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Universitat Ramon Llull. La Salle; Utrecht University. Institute for Marine and Atmospheric Research Utrecht (IMAU). Dept. of Physics and Astronomy; University Amsterdam. Institute for Environmental Studies |
Abstract:
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Small-scale temperature and conductivity varia-tions have been measured in the upper 100 m of the northeastAtlantic during the STRATIPHYT-II cruise (Las Palmas–Reykjavik, 6 April–3 May 2011). The measurements weredone at midday and comprised 2 to 15 vertical profiles at eachstation. The derived turbulent quantities show a transitionbetween weakly-stratified (mixed layer depth, MLD,<100)and well-mixed waters (MLD>100), which was centered atabout 48◦N. The temperature eddy diffusivities,KT, rangefrom 10−5to 100m2s−1in the weakly-stratified stations, andrange from 3×10−4to 2×100m2s−1in the well-mixed sta-tions. The turbulent kinetic energy dissipation rates,ε, rangefrom 3×10−8to 2×10−6m2s−3south of the transition zone,and from 10−7to 10−5m2s−3north of the transition zone.The station-averagedKTvalues throughout the mixed layerincrease exponentially with the wind speed. The station-averagedεvalues throughout the mixed layer scale with thewind stress similarity variable with a scaling factor of about1.8 in the wind-dominated stations (ε≈1.8u3∗/(−κz)). Thevalues ofKTandεare on average 10 times higher comparedto the values measured at the same stations in July 2009.The results presented here constitute a unique data set giv-ing large spatial coverage of upper ocean spring turbulencequantities. |
Publication date:
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2012-11-07 |
Subject (UDC):
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504 - Ciències del medi ambient |
Subject(s):
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Oceanografia Meteorologia marítima |
Rights:
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L'accés als continguts d'aquest document queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons:http://creativecommons.org/licenses/by/4.0/
© L'autor/a |
Pages:
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13 p. |
Document type:
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Article Article - Published version |
DOI:
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http://dx.doi.org/10.5194/os-8-945-2012
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Published by:
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European Geosciences Union
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Publish at:
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Ocean Science, 2012, Vol. 8, No 6 (Novembre)
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