Stability analysis of the Labrador Current

Thomsen, Sören, Eden, Carsten and Czeschel, Lars (2014) Stability analysis of the Labrador Current Journal of Physical Oceanography, 44 (2). pp. 445-463. DOI 10.1175/JPO-D-13-0121.1.

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Supplementary data:


Mooring observations and model simulations point to an instability of the Labrador Current (LC) during winter, with enhanced eddy kinetic energy (EKE) at periods between 2 to 5 days, and much less EKE during other seasons. Linear stability analysis using vertical shear and stratification from the model reveals three dominant modes of instability in the LC:
- a balanced interior mode with along-flow wavelengths of about 30–45 km, phase velocities of 0.3 m/s, maximal growth rates of 1 d−1 and surface intensified, but deep reaching amplitudes,
- a balanced shallow mode with along-flow wavelengths of about 0.3–1.5 km, about three times larger phase speeds and growth rates, but amplitudes confined to the mixed layer (ML),
- and an unbalanced symmetric mode with largest growth rates, vanishing phase speeds and along-flow structure, and very small cross-flow wavelengths, also confined to the ML.
Both balanced modes are akin to baroclinic instability, but operate at moderate to small Richardson numbers Ri with much larger growth rates as for the quasi-geostrophic limit of Ri ≫ 1. The interior mode is found to be responsible for the instability of the LC during winter. Weak stratification and enhanced vertical shear due to local buoyancy loss and the advection of convective water masses from the interior result in small Ri within the LC, and to three times larger growth rates of the interior mode in March compared to summer and fall conditions. Both the shallow and the symmetric mode are not resolved by the model, but it is suggested that they might also play an important role for the instability in the LC and for lateral mixing.

Document Type: Article
Additional Information: WOS:000331024500003
Keywords: Circulation/ Dynamics, Boundary currents, Eddies, Frontogenesis/frontolysis, Instability, Mesoscale processes, Variability, Intraseasonal variability
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
DOI etc.: 10.1175/JPO-D-13-0121.1
ISSN: 0022-3670
Projects: Future Ocean
Date Deposited: 12 Nov 2013 13:05
Last Modified: 01 Jun 2015 23:38

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