Abstract
We show that oceanic cycle lengths persist across oceanic cyclic time-series by comparing cycles in series that come from “sister” measurements in the North Atlantic Ocean. These are the North Atlantic oscillation (NAO), the Atlantic multidecadal oscillation (AMO) and the Atlantic meridional overturning circulation (AMOC). The raw NAO series, which is an extremely noisy series in its raw format, showed cycles at 7, 13, 20, 26 and 34 years that were common with, or overlapped, the other two series, and across increasing degrees of smoothing of the NAO series. At the 1960 midpoint of the hiatus period 1943–1975, NAO was leading time-series to AMOC and AMO and AMO was a leading time-series to AMOC, but in 1975, at the end of the hiatus period, the leading relations were reversed.
Highlights
The North Atlantic oscillation (NAO), the Atlantic multidecadal oscillation (AMO) and the Atlantic meridional overturning circulation (AMOC) time-series all describe different aspects of water movements in the Atlantic Ocean
The NAO measures sea surface pressure difference between two locations whereas the AMO and the AMOC are constructed from several measures averaged over an area
The results suggest that the three oscillation LL-relations: LL(AMOC, NAO), LL(AMO, NAO) and LL(AMO, AMOC) show concerted movements and describe different aspects of the same system of ocean dynamics
Summary
The North Atlantic oscillation (NAO), the Atlantic multidecadal oscillation (AMO) and the Atlantic meridional overturning circulation (AMOC) time-series all describe different aspects of water movements in the Atlantic Ocean. The NAO series are often described as being basically noise [1]. The two other series are found to show some variability, their potential cyclic behavior is not well established. The relations between the time-series are largely unexplored. This would be a important issue, since the mechanisms that generate cycles (or variability if cycles cannot be established) may differ for each of the cyclic components. We examine (i) common cycle times for the oscillations and (ii) the interaction between them in terms of leading and lagging relations between pairs of oscillations.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
