In:
Progress in oceanography, Amsterdam [u.a.] : Elsevier Science, 1963, 77(2008), 4, Seite 276-284, 0079-6611
In:
volume:77
In:
year:2008
In:
number:4
In:
pages:276-284
Beschreibung / Inhaltsverzeichnis:
The Vema Channel acts as a major conduit for the equatorward spreading of Antarctic Bottom Water between the Argentine and Brazil Basins. For almost two years the thermal stratification above its saddle depth (4660 m) called Vema Sill was recorded by moored thermistors and current meters. The lowest 490 m of the water column was instrumented to monitor the well-developed benthic boundary layer of Antarctic Bottom Water. The latter can be subdivided into Weddell Sea Deep Water on the sea bed and lower Circumpolar Deep Water above it. The data show fluctuations on various scales including periods, each about 12 weeks long, when the abyssal stratification virtually disappeared. Assuming a stable ratio between density and temperature, time series of bulk Richardson numbers are estimated from temperature and current shear data. The results suggest a potential for intermittent episodes of locally generated vertical mixing.
Materialart:
Online-Ressource
ISSN:
0079-6611
DOI:
10.1016/j.pocean.2006.05.006
Sprache:
Englisch
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