Cristin-resultat-ID: 1469729
Sist endret: 11. april 2018 11:38
NVI-rapporteringsår: 2017
Resultat
Vitenskapelig artikkel
2017

Interannual tropical Pacific sea surface temperature anomalies teleconnection to Northern Hemisphere atmosphere in November

Bidragsytere:
  • Martin Peter King
  • Ivana Herceg-Bulić
  • Fred Kucharski og
  • Noel Keenlyside

Tidsskrift

Climate Dynamics
ISSN 0930-7575
e-ISSN 1432-0894
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2017
Publisert online: 2017
Trykket: 2018
Volum: 50
Hefte: 5-6
Sider: 1881 - 1899

Importkilder

Scopus-ID: 2-s2.0-85019054191

Beskrivelse Beskrivelse

Tittel

Interannual tropical Pacific sea surface temperature anomalies teleconnection to Northern Hemisphere atmosphere in November

Sammendrag

We investigate the Northern Hemisphere atmospheric circulation anomalies associated to the sea surface temperature (SST) anomalies that are related to the eastern-Pacific and central-Pacific El Nino-Southern Oscillations in the late autumn (November). This research is motivated by the need for improving understanding of the autumn climate conditions which can impact on winter climate, as well as the relative lack of study on the boreal autumn climate processes compared to winter. Using reanalysis and SST datasets available from the late nineteenth century through the recent years, we found that there are two major atmospheric responses; one is a hemispheric-wide wave number-4 pattern, another has a more annular pattern. Both of these project on the East Atlantic pattern (southward-shifted North Atlantic Oscillation) in the Atlantic sector. Which of the patterns is active is suggested to depend on the background mean flow, with the annular anomaly active in the most recent decades, while the wave-4 pattern in the decades before. This switch is associated with a change of correlation sign in the North Pacific. We discuss the robustness of this finding. The ability of two atmospheric general circulation models (ICTP-AGCM and ECHAM-AGCM) to reproduce the teleconnections is also examined. Evidence provided shows that the wave-4 pattern and the East Atlantic pattern signals can be reproduced by the models, while the shift from this to an annular response for the recent years is not found conclusively.

Bidragsytere

Martin Peter King

  • Tilknyttet:
    Forfatter
    ved NORCE Klima ved NORCE Norwegian Research Centre AS

Ivana Herceg-Bulić

  • Tilknyttet:
    Forfatter
    ved Sveučilište u Zagrebu

Fred Kucharski

  • Tilknyttet:
    Forfatter
    ved Abdus Salam International Centre for Theoretical Physics

Noel Keenlyside

  • Tilknyttet:
    Forfatter
    ved Geofysisk institutt ved Universitetet i Bergen
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