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Title: Demons in the North Atlantic: Variability of Deep Ocean Ventilation

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2020GL092340· OSTI ID:1786630
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Program in Atmospheric and Oceanic Science Princeton University Princeton NJ USA
  2. Department of Earth Sciences University of Oxford Oxford UK
  3. University of Brest CNRS, IRD, Ifremer, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM Brest France
  4. Department of Physics University of Oxford Oxford UK
+ Show Author Affiliations

Abstract Translation of atmospheric forcing variability into the ocean interior via ocean ventilation is an important aspect of transient climate change. On a seasonal timescale in the subtropics, this translation is mediated by a so‐called “Demon” that prevents access to all except late‐winter mixed‐layer water. Here, we use an eddy‐permitting numerical circulation model to investigate a similar process operating on longer (interannual) timescales in the subpolar North Atlantic. We find that variations in atmospheric forcing are mediated in their translation to the ocean interior, with year‐to‐year changes in the late‐winter mixed layer depth being the critical factor. The signature of persistent strong atmospheric forcing driving deep mixed layers is preferentially ventilated to the interior when the forcing is ceased. Susceptibility to this effect depends on the location and density of subduction—with the rate at which newly ventilated water escapes its region of subduction being the crucial factor.

Sponsoring Organization:
USDOE
OSTI ID:
1786630
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Vol. 48 Journal Issue: 9; ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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