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  • Keenlyside, Noel S.  (4)
  • 2005-2009  (4)
Material
Publisher
Person/Organisation
Language
Years
  • 2005-2009  (4)
Year
Subjects(RVK)
  • 1
    Online Resource
    Online Resource
    On Sub-ENSO Variability
    American Meteorological Society ; 2007
    In:  Journal of Climate Vol. 20, No. 14 ( 2007-07-15), p. 3452-3469
    Details
    In: Journal of Climate, American Meteorological Society, Vol. 20, No. 14 ( 2007-07-15), p. 3452-3469
    Abstract: Multichannel singular spectrum analysis (MSSA) of surface zonal wind, sea surface temperature (SST), 20° isotherm depth, and surface zonal current observations (between 1990 and 2004) identifies three coupled ocean–atmosphere modes of variability in the tropical Pacific: the El Niño–Southern Oscillation (ENSO), the annual cycle, and a mode with a 14–18-month period, which is referred to as sub-ENSO in this study. The sub-ENSO mode accounts for the near 18-month (near annual) variability prior to (following) the 1997/98 El Niño event. It was strongest during this El Niño event, with SST anomalies exceeding 1°C. Sub-ENSO peak SST anomalies are ENSO-like in structure and are associated with eastward propagating heat content variations. However, the SST anomalies are preceded by and in near quadrature with relatively strong remotely forced westward propagating zonal current variations, suggesting the sub-ENSO mode arises from the zonal-advective feedback. The sub-ENSO mode is found to exist also in an intermediate complexity model (ICM) of the tropical Pacific. A heat budget analysis of the model’s sub-ENSO mode shows it indeed arises from the zonal-advective feedback. In the model, both ENSO and sub-ENSO modes coexist, but there is a weak nonlinear interaction between them. Experiments also show that the observed changes in sub-ENSO’s characteristics may be explained by changes in the relative importance of zonal and vertical advection SST tendencies.
    Type of Medium: Online Resource
    ISSN: 1520-0442 , 0894-8755
    URL: Article
    DOI: 10.1175/JCLI4199.1
    RVK:
    UA 4548
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2007
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    Location Call Number Limitation Availability
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Internal and external North Atlantic Sector variability in the Kiel Climate Model
    Schweizerbart ; 2009
    In:  Meteorologische Zeitschrift Vol. 18, No. 4 ( 2009-08-01), p. 433-443
    Details
    In: Meteorologische Zeitschrift, Schweizerbart, Vol. 18, No. 4 ( 2009-08-01), p. 433-443
    Type of Medium: Online Resource
    ISSN: 0941-2948
    Uniform Title: Internal and external North Atlantic Sector variability in the Kiel Climate Model
    URL: Article
    DOI: 10.1127/0941-2948/2009/0395
    RVK:
    UA 5450
    Language: English , English
    Publisher: Schweizerbart
    Publication Date: 2009
    detail.hit.zdb_id: 511391-X
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    SSG: 14
    Location Call Number Limitation Availability
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Understanding Equatorial Atlantic Interannual Variability
    American Meteorological Society ; 2007
    In:  Journal of Climate Vol. 20, No. 1 ( 2007-01-01), p. 131-142
    Details
    In: Journal of Climate, American Meteorological Society, Vol. 20, No. 1 ( 2007-01-01), p. 131-142
    Abstract: An observational-based analysis of coupled variability in the equatorial Atlantic and its seasonality is presented. Regression analysis shows that the three elements of the Bjerknes positive feedback exist in the Atlantic and are spatially similar to those of the Pacific. The cross-correlation functions of the elements of the Bjerknes feedback are also similar and consistent with an ocean–atmosphere coupled mode. However, the growth rate in the Atlantic is up to 50% weaker, and explained variance is significantly lower. The Bjerknes feedback in the Atlantic is strong in boreal spring and summer, and weak in other seasons, which explains why the largest sea surface temperature anomalies (SSTAs) occur in boreal summer. Its seasonality is determined by seasonal variations in both atmospheric sensitivity to SSTA and SSTA sensitivity to subsurface temperature anomalies.
    Type of Medium: Online Resource
    ISSN: 1520-0442 , 0894-8755
    URL: Article
    DOI: 10.1175/JCLI3992.1
    RVK:
    UA 4548
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2007
    detail.hit.zdb_id: 246750-1
    detail.hit.zdb_id: 2021723-7
    Location Call Number Limitation Availability
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Seasonal cycle in the upper equatorial Atlantic Ocean
    American Geophysical Union (AGU) ; 2009
    In:  Journal of Geophysical Research Vol. 114, No. C9 ( 2009-09-18)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 114, No. C9 ( 2009-09-18)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2009JC005418
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2009
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    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
    Location Call Number Limitation Availability
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