کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4553708 1328922 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Temperature fluctuations and current shear in Antarctic Bottom Water at the Vema Sill
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Temperature fluctuations and current shear in Antarctic Bottom Water at the Vema Sill
چکیده انگلیسی
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 1-2 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Progress in Oceanography - Volume 77, Issue 4, June 2008, Pages 276-284
نویسندگان
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