Parameterization of vertical mixing in the Weddell Sea

Edit Item Edit Item

General Information:

Timmermann, R. and Beckmann, A. (2004): Parameterization of vertical mixing in the Weddell Sea , Ocean modelling, 6 (1), pp. 83-100 . doi: 10.1016/S1463-5003(02)0061-6
Cite this page as:
Official URL:
Contact Email:

PDF (Fulltext)

Download (972Kb) | Preview
Cite this document as:
Supplementary Information:


A series of vertical mixing schemes implemented in a circumpolar coupled ice-ocean model of the BRIOS family is validated against observations of hydrography and sea ice coverage in the Weddell Sea.Assessed parameterizations include the Richardson number-dependent Pacanowski-Philander scheme, the Mellor-Yamada turbulent closure scheme, the K-Profile Parameterization, a bulk mixed layer model and the Ocean Penetrative Plume Scheme.Combinations of the Pacanowski-Philander parameterization or the Ocean Penetrative Plume Scheme with a simple diagnostic model depending on the Monin-Obukhov length yield particularly good results.In contrast, experiments using a constant diffusivity and the traditional {\it convective adjustment} cannot reproduce the observations.An underestimation of wind-driven mixing in summer leads to an accumulation of salt in the winter water layer, inducing deep convection in the central Weddell Sea and a homogenization of the water column.Large upward heat fluxes in these simulations lead to the formation of unrealistic, large polynyas in the central Weddell Sea after only a few years of integration.We conclude that an adequate parameterization of both wind-induced mixing and bouyancy-driven convection is crucial for realistic simulations of processes in seasonally ice-covered seas.

Further Details:

read more
OAI 2.0:
ePIC is powered by:
EPrints 3