On the mechanism of centennial thermohaline oscillations

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ID: 302328
2006
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Abstract
Centennial oscillations of the ocean thermohaline circulation are studied in a 2-D latitude-depth model under mixed boundary conditions (i.e.restoring surface temperature and prescribed freshwater flux).The oscillations are revealed through linear stability analysis of a steady state obtained in a single hemisphere configuration.A density variance budget is performed and helps determine the physical processes sustaining these oscillations: the restoring surface temperature appears as a source of density variance -this is a consequence of positively-correlated temperature and salinity anomalies.A minimal model, the Howard-Malkus loop oscillator, enables us to understand physically the oscillatory and growth mechanisms.The centennial oscillation is connected to the advection of salinity anomaly around the loop; it is also related to the salinity feedback on the overturning which reinforces anomalies through a change of residence time in the freshwater flux regions.Analytical solutions of this loop model show that these centennial oscillations exist in a specific parameter regime in terms of the freshwater flux amplitude F 0 : oscillations are damped if F 0 is too weak, but if F 0 is too large, the instability grows exponentially without oscillating-the latter regime is known as the positive salinity feedback.The robustness of these oscillations is then analyzed in more realistic bihemispheric configurations, some including a highly idealized Antarctic Circumpolar Current: oscillations are then always damped.These results are rationalized with the loop model, and compared to the oscillations found in general circulation models.
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Authors Florian Sévellec, Thierry Huck, Mahdi Ben Jelloul
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Journal journal of marine research
Year 2006
DOI
10.1357/002224006778189608
URL
https://doi.org/10.1357/002224006778189608
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