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    Causal dependences between the coupled ocean–atmosphere dynamics over the tropical Pacific, the North Pacific and the North Atlantic

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    Authors
    Vannitsem, Stéphane
    Ekelmans, Pierre
    Discipline
    Earth and related Environmental sciences
    Audience
    Scientific
    Date
    2018
    Publisher
    Copernicus Publications on behalf of the European Geophysical Union
    Metadata
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    Description
    The causal dependences (in a dynamical sense) between the dynamics of three different coupled ocean–atmosphere basins, the North Atlantic, the North Pacific and the tropical Pacific region (Nino3.4), have been explored using data from three reanalysis datasets, namely ORA-20C, ORAS4 and ERA-20C. The approach is based on convergent cross mapping (CCM) developed by Sugihara et al. (2012) that allows for evaluating the dependences between variables beyond the classical teleconnection patterns based on correlations. The use of CCM on these data mostly reveals that (i) the tropical Pacific (Nino3.4 region) only influences the dynamics of the North Atlantic region through its annual climatological cycle; (ii) the atmosphere over the North Pacific is dynamically forcing the North Atlantic on a monthly basis; (iii) on longer timescales (interannual), the dynamics of the North Pacific and the North Atlantic are influencing each other through the ocean dynamics, suggesting a connection through the thermohaline circulation. These findings shed a new light on the coupling between these three different regions of the globe. In particular, they call for a deep reassessment of the way teleconnections are interpreted and for a more rigorous way to evaluate dynamical dependences between the different components of the climate system.
    Citation
    Vannitsem, Stéphane; Ekelmans, Pierre (2018). Causal dependences between the coupled ocean–atmosphere dynamics over the tropical Pacific, the North Pacific and the North Atlantic. , Earth System Dynamics, Vol. 9, 1063-1083, Copernicus Publications on behalf of the European Geophysical Union, DOI: 10.5194/esd-9-1063-2018.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/7055
    doi: http://dx.doi.org/10.5194/esd-9-1063-2018
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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