Influence of langmuir circulation on the deepening of the wind-mixed layer

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dc.identifier.uri Noh, Y. Goh, G. Raasch, S. 2019-10-09T10:27:12Z 2019-10-09T10:27:12Z 2011
dc.identifier.citation Noh, Y.; Goh, G.; Raasch, S.: Influence of langmuir circulation on the deepening of the wind-mixed layer. In: Journal of Physical Oceanography 41 (2011), Nr. 3, S. 472-484. DOI:
dc.description.abstract Analysis of large eddy simulation data reveals that Langmuir circulation (LC) induces a significant enhancement of the mixed layer deepening, only if the mixed layer depth (MLD) h is shallow and the buoyancy jump across it ΔB is small, when simulations are initiated by applying the wind stress to a motionless mixed layer with stratification. The difference in the entrainment rate between the cases with and without LC decreases with hΔB/υL2, where υL is the velocity scale of LC. The ratio of the mixing length scale l between the cases with and without LC is close to 1 for larger Rt [=(Nl0/q)2; Rt > ∼1], but it increases to above 10 with the decrease of Rt, where N is the Brunt–Väisälä frequency and q and l0 are the velocity and length scales of turbulence in the homogeneous layer. It is also found that, in the presence of LC, the effect of stratification on vertical mixing should be parameterized in terms of Rt instead of Ri (=(N/S)2), because velocity shear S is no longer a dominant source of turbulence. The parameterization is provided by l/l0 = (1 + αRt)−1/2 with α ∼ 50, regardless of the presence of LC. However, LC makes l0 much larger than conventionally used for the boundary layer. Copyright 2011 American Meteorological Society eng
dc.language.iso eng
dc.publisher Boston, Massachusetts : American Meteorological Society
dc.relation.ispartofseries Journal of Physical Oceanography 41 (2011), Nr.3
dc.rights Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
dc.subject Oceanic mixed layer eng
dc.subject Large eddy simulation eng
dc.subject Mixed layer eng
dc.subject.ddc 550 | Geowissenschaften ger
dc.subject.ddc 551 | Geologie, Hydrologie, Meteorologie ger
dc.title Influence of langmuir circulation on the deepening of the wind-mixed layer eng
dc.type article
dc.type Text
dc.relation.essn 1520-0485
dc.relation.issn 0022-3670
dc.bibliographicCitation.issue 3
dc.bibliographicCitation.volume 41
dc.bibliographicCitation.firstPage 472
dc.bibliographicCitation.lastPage 484
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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