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I. Ambar, M. Howe (1979)
Observations of the Mediterranean outflow—II The deep circulation in the vicinity of the Gulf of Cadiz, 26A
M. Baringer, J. Price (1997)
Mixing and spreading of the Mediterranean outflow, 27
L. M. Beal, H. L. Bryden (1999)
The velocity and vorticity structure of the Agulhas Current at 32°S, 104
G. Audi, O. Bersillon, J. Blachot, A. Wapstra (2003)
The NUBASE evaluation of nuclear and decay properties, 729
M. Andres, J. Toole, D. Torres, W. Smethie, T. Joyce, R. Curry (2016)
Stirring by deep cyclones and the evolution of Denmark Strait Overflow Water observed at line W, 109
AbstractRadiocarbon dates of fossil carbonates sampled from sediment cores and the seafloor have been used to infer that deep ocean ventilation during the last ice age was different from today. In this first of two companion papers, the time-averaged abyssal circulation in the modern Atlantic is estimated by combining a hydrographic climatology, observational estimates of volume transports, Argo float velocities at 1000 m, radiocarbon data, and geostrophic dynamics. Different estimates of modern circulation, obtained from different prior assumptions about the abyssal flow and different errors in the geostrophic balance, are produced for use in a robust interpretation of fossil records in terms of deviations from the present-day flow, which is undertaken in Part II. We find that, for all estimates, the meridional transport integrated zonally and averaged over a hemisphere, ⟨Vk⟩, is southward between 1000 and 4000 m in both hemispheres, northward between 4000 and 5000 m in the South Atlantic, and insignificant between 4000 and 5000 m in the North Atlantic. Estimates of ⟨Vk⟩ obtained from two distinct prior circulations—one based on a level of no motion at 4000 m and one based on Argo float velocities at 1000 m—become statistically indistinguishable when Δ14C data are considered. The transport time scale, defined as τk=Vk/〈Vk〉, where Vk is the volume of the kth layer, is estimated to about a century between 1000 and 3000 m in both the South and North Atlantic, 124 ± 9 yr (203 ± 23 yr) between 3000 and 4000 m in the South (North) Atlantic, and 269 ± 115 yr between 4000 and 5000 m in the South Atlantic.
Journal of Physical Oceanography – American Meteorological Society
Published: Jun 18, 2021
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