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Temporal variability of the Atlantic meridional overturning circulation at 26.5°N
Cunningham, S.A.; Kanzow, T.; Rayner, D.; Baringer, M.O.; Johns, W.E.; Marotzke, J.; Longworth, H.; Grant, E.M.; Hirschi, J.J.-M.; Beal, L.M.; Meinen, C.S.; Bryden, H.L. (2007). Temporal variability of the Atlantic meridional overturning circulation at 26.5°N. Science (Wash.) 317(5840): 935-938
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075; e-ISSN 1095-9203, meer
Peer reviewed article  
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  • Cunningham, S.A.
  • Kanzow, T.
  • Rayner, D.
  • Baringer, M.O.
  • Johns, W.E.
  • Marotzke, J.
  • Longworth, H.
  • Grant, E.M.
  • Hirschi, J.J.-M.
  • Beal, L.M.
  • Meinen, C.S.
  • Bryden, H.L.
Abstract
    The vigor of Atlantic meridional overturning circulation (MOC) is thought to be vulnerable to global warming, but its short-term temporal variability is unknown so changes inferred from sparse observations on the decadal time scale of recent climate change are uncertain. We combine continuous measurements of the MOC (beginning in 2004) using the purposefully designed transatlantic Rapid Climate Change array of moored instruments deployed along 26.5°N, with time series of Gulf Stream transport and surface-layer Ekman transport to quantify its intra-annual variability. The year-long average overturning is 18.7 ± 5.6 sverdrups (Sv) (range: 4.0 to 34.9 Sv, where 1 Sv = a flow of ocean water of 106 cubic meters per second). Interannual changes in the overturning can be monitored with a resolution of 1.5 Sv.
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