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Low-frequency thermohaline variability in the Subtropical South Atlantic pycnocline during 2002–2013

Abstract : Low-frequency variability of spiciness is observed in the Subtropical South Atlantic over the period 2002–2013 with the Argo gridded product In Situ Analysis System. Within the pycnocline, spiciness anomalies propagate at a mean speed of 0.04 ± 0.02 m s−1, the same speed as the gyre mean circulation, from the Agulhas Retroflection region off South Africa (~35°S–20°E) toward the South American coast (~18°S–35°W). After 2010, propagation is still found, but stationary local spiciness generation is also found over the Subtropical South Atlantic. This spiciness increase is associated with high values of vertical Turner angle below the mixed layer base during late winter. This suggests spice injection resulting from penetrative convective mixing due to air-sea buoyancy loss. These features may have an impact on the low-frequency warm and salty signal produced by the Agulhas leakage in Subtropical South Atlantic and the upper branch of the Atlantic Meridional Overturning Circulation.
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https://hal.archives-ouvertes.fr/hal-01131534
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Soumis le : jeudi 25 novembre 2021 - 15:23:30
Dernière modification le : vendredi 3 décembre 2021 - 11:42:31

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2014GL061160.pdf
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Nicolas Kolodziejczyk, Gilles Reverdin, Fabienne Gaillard, Alban Lazar. Low-frequency thermohaline variability in the Subtropical South Atlantic pycnocline during 2002–2013. Geophysical Research Letters, American Geophysical Union, 2014, 41 (18), pp.6468-6475. ⟨10.1002/2014GL061160⟩. ⟨hal-01131534⟩

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