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  • 1
    Online Resource
    Online Resource
    Origin of Weakened Interannual Sea Surface Temperature Variability in the Southeastern Tropical Atlantic Ocean
    American Geophysical Union (AGU) ; 2020
    In:  Geophysical Research Letters Vol. 47, No. 20 ( 2020-10-28)
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 47, No. 20 ( 2020-10-28)
    Abstract: Since 2000, the March‐April‐May sea surface temperature variability has weakened by more than 30% in the Angola‐Benguela area Since 2000, the equatorial remote forcing has less influence on Angola‐Benguela sea surface temperatures Since 2000, the Angola‐Benguela local forcing is likely to impact the surface layer more due to a shallower stratification maximum
    Type of Medium: Online Resource
    ISSN: 0094-8276 , 1944-8007
    URL: Article
    DOI: 10.1029/2020GL089348
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2020
    detail.hit.zdb_id: 2021599-X
    detail.hit.zdb_id: 7403-2
    SSG: 16,13
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  • 2
    Online Resource
    Online Resource
    Natural variability of the central Pacific El Niño event on multi-centennial timescales : CENTRAL PACIFIC EL NINO
    American Geophysical Union (AGU) ; 2011
    In:  Geophysical Research Letters Vol. 38, No. 2 ( 2011-01), p. n/a-n/a
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 38, No. 2 ( 2011-01), p. n/a-n/a
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/2010GL045886
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2011
    detail.hit.zdb_id: 2021599-X
    detail.hit.zdb_id: 7403-2
    SSG: 16,13
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  • 3
    Online Resource
    Online Resource
    Role of internal variability in recent decadal to multidecadal tropical Pacific climate changes
    American Geophysical Union (AGU) ; 2017
    In:  Geophysical Research Letters Vol. 44, No. 9 ( 2017-05-16), p. 4246-4255
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 44, No. 9 ( 2017-05-16), p. 4246-4255
    Abstract: Pacific Walker Circulation strongly varies internally Anthropogenic signals in the tropical Pacific sector are hard to detect There is large model uncertainty about the future of the Pacific Walker Circulation
    Type of Medium: Online Resource
    ISSN: 0094-8276 , 1944-8007
    URL: Issue
    URL: Article
    DOI: 10.1002/grl.v44.9
    DOI: 10.1002/2016GL072355
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2017
    detail.hit.zdb_id: 2021599-X
    detail.hit.zdb_id: 7403-2
    SSG: 16,13
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  • 4
    Online Resource
    Online Resource
    Comprehensive Earth System Models of the Last Glacial Cycle
    American Geophysical Union (AGU) ; 2016
    In:  Eos Vol. 97 ( 2016-09-23)
    Details
    In: Eos, American Geophysical Union (AGU), Vol. 97 ( 2016-09-23)
    Abstract: Much of modern climate science fails to consider millennium-scale processes, many of which may prove to be important for predicting the climate trajectory in the shorter term.
    Type of Medium: Online Resource
    ISSN: 2324-9250
    URL: Article
    DOI: 10.1029/2016EO059587
    Language: Unknown
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2016
    detail.hit.zdb_id: 2118760-5
    detail.hit.zdb_id: 240154-X
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  • 5
    Online Resource
    Online Resource
    A high resolution AGCM study of the El Niño impact on the North Atlantic/European sector : THE IMPACT OF EL NIÑO ON EUROPE
    American Geophysical Union (AGU) ; 2002
    In:  Geophysical Research Letters Vol. 29, No. 9 ( 2002-05), p. 5-1-5-4
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 29, No. 9 ( 2002-05), p. 5-1-5-4
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/2001GL013726
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2002
    detail.hit.zdb_id: 2021599-X
    detail.hit.zdb_id: 7403-2
    SSG: 16,13
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  • 6
    Online Resource
    Online Resource
    Is the observed NAO variability during the instrumental record unusual?
    American Geophysical Union (AGU) ; 2008
    In:  Geophysical Research Letters Vol. 35, No. 11 ( 2008-06-05)
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 35, No. 11 ( 2008-06-05)
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/2008GL033273
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2008
    detail.hit.zdb_id: 2021599-X
    detail.hit.zdb_id: 7403-2
    SSG: 16,13
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  • 7
    Online Resource
    Online Resource
    Effects of Ocean Biology on the Penetrative Radiation in a Coupled Climate Model
    American Meteorological Society ; 2006
    In:  Journal of Climate Vol. 19, No. 16 ( 2006-08-15), p. 3973-3987
    Details
    In: Journal of Climate, American Meteorological Society, Vol. 19, No. 16 ( 2006-08-15), p. 3973-3987
    Abstract: The influence of phytoplankton on the seasonal cycle and the mean global climate is investigated in a fully coupled climate model. The control experiment uses a fixed attenuation depth for shortwave radiation, while the attenuation depth in the experiment with biology is derived from phytoplankton concentrations simulated with a marine biogeochemical model coupled online to the ocean model. Some of the changes in the upper ocean are similar to the results from previous studies that did not use interactive atmospheres, for example, amplification of the seasonal cycle; warming in upwelling regions, such as the equatorial Pacific and the Arabian Sea; and reduction in sea ice cover in the high latitudes. In addition, positive feedbacks within the climate system cause a global shift of the seasonal cycle. The onset of spring is about 2 weeks earlier, which results in a more realistic representation of the seasons. Feedback mechanisms, such as increased wind stress and changes in the shortwave radiation, lead to significant warming in the midlatitudes in summer and to seasonal modifications of the overall warming in the equatorial Pacific. Temperature changes also occur over land where they are sometimes even larger than over the ocean. In the equatorial Pacific, the strength of interannual SST variability is reduced by about 10%–15% and phase locking to the annual cycle is improved. The ENSO spectral peak is broader than in the experiment without biology and the dominant ENSO period is increased to around 5 yr. Also the skewness of ENSO variability is slightly improved. All of these changes lead to the conclusion that the influence of marine biology on the radiative budget of the upper ocean should be considered in detailed simulations of the earth’s climate.
    Type of Medium: Online Resource
    ISSN: 1520-0442 , 0894-8755
    URL: Article
    DOI: 10.1175/JCLI3828.1
    RVK:
    UA 4548
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2006
    detail.hit.zdb_id: 246750-1
    detail.hit.zdb_id: 2021723-7
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  • 8
    Online Resource
    Online Resource
    Subtropical Forcing of Tropical Pacific Climate and Decadal ENSO Modulation
    American Meteorological Society ; 2008
    In:  Journal of Climate Vol. 21, No. 18 ( 2008-09-15), p. 4691-4709
    Details
    In: Journal of Climate, American Meteorological Society, Vol. 21, No. 18 ( 2008-09-15), p. 4691-4709
    Abstract: The relative impact of the subtropical North and South Pacific Oceans on the tropical Pacific climate mean state and variability is estimated using an ocean–atmosphere–sea ice coupled general circulation model. Tailored experiments are performed in which the model is forced by idealized sea surface temperature anomalies (SSTAs) in the subtropics of both hemispheres. The main results of this study suggest that subtropical South Pacific climate variations play a dominant role in tropical Pacific decadal variability and in the decadal modulation of El Niño–Southern Oscillation (ENSO). In response to a 2°C warming in the subtropical South Pacific, the equatorial Pacific SST increases by about 0.6°C, approximately 65% larger than the change in the North Pacific experiment. The subtropics affect equatorial SST mainly through atmosphere–mixed layer interactions in the South Pacific experiments; the response is mostly accomplished within a decade. The “oceanic tunnel” dominates in the North Pacific experiments; the response takes at least 100 yr to be accomplished. Similar sensitivity experiments conducted with the stand-alone atmosphere model showed that both air–sea interactions and ocean dynamics are crucial in shaping the tropical climate response. The statistics of ENSO exhibit significant changes in amplitude and frequency in response to a warming/cooling of the subtropical South Pacific: a 2°C warming (cooling) of subtropical South Pacific SST reduces (increases) the interannual standard deviation by about 30% (20%) and shortens (lengthens) the ENSO period. The simulated changes in the equatorial zonal SST gradient are the main contributor to the modulation of ENSO variability. The simulated intensification (weakening) of the annual cycle in response to an enhanced warming (cooling) in subtropical South Pacific partly explains the shifts in frequency, but may also lead to a weaker (stronger) ENSO. The subtropical North Pacific thermal forcing did not change the statistical properties of ENSO as strongly.
    Type of Medium: Online Resource
    ISSN: 1520-0442 , 0894-8755
    URL: Article
    DOI: 10.1175/2008JCLI2075.1
    RVK:
    UA 4548
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2008
    detail.hit.zdb_id: 246750-1
    detail.hit.zdb_id: 2021723-7
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  • 9
    Online Resource
    Online Resource
    Wind-Driven Oceanic Rossby Waves in the Tropical South Indian Ocean with and without an Active ENSO
    American Meteorological Society ; 2005
    In:  Journal of Physical Oceanography Vol. 35, No. 5 ( 2005-05-01), p. 729-746
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 35, No. 5 ( 2005-05-01), p. 729-746
    Abstract: The interannual heat content variability in the tropical south Indian Ocean (SIO) and its relationship with El Niño–Southern Oscillation (ENSO) is studied. The baroclinic ocean response to stochastic wind stress predicted by a simple analytical model is compared with two integrations of the ECHO-G coupled general circulation model. In one integration, ocean–atmosphere interactions are suppressed in the tropical Pacific Ocean, so that this integration does not simulate ENSO. In the other integration, interactions are allowed everywhere and ENSO is simulated. The results show that basinwide variability in the SIO heat content can be produced by two mechanisms: 1) oscillatory forcing by ENSO-related wind stress and 2) temporally stochastic and spatially coherent wind stress forcing. Previous studies have shown that transmission of energy from the tropical Pacific to the southern Indian Ocean occurs through coastal Kelvin waves along the western coast of Australia. The results in this paper confirm the occurrence of such transmission. In the ECHO-G simulations, this transmission occurs both at the annual time scale and at interannual time scales. Generation of offshore Rossby waves by these coastal Kelvin waves at interannual time scales—and, in particular, at the ENSO time scale—was found.
    Type of Medium: Online Resource
    ISSN: 1520-0485 , 0022-3670
    URL: Article
    DOI: 10.1175/JPO2723.1
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2005
    detail.hit.zdb_id: 2042184-9
    detail.hit.zdb_id: 184162-2
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  • 10
    Online Resource
    Online Resource
    Arctic–North Atlantic Interactions and Multidecadal Variability of the Meridional Overturning Circulation
    American Meteorological Society ; 2005
    In:  Journal of Climate Vol. 18, No. 19 ( 2005-10-01), p. 4013-4031
    Details
    In: Journal of Climate, American Meteorological Society, Vol. 18, No. 19 ( 2005-10-01), p. 4013-4031
    Abstract: Analyses of a 500-yr control integration with the non-flux-adjusted coupled atmosphere–sea ice–ocean model ECHAM5/Max-Planck-Institute Ocean Model (MPI-OM) show pronounced multidecadal fluctuations of the Atlantic overturning circulation and the associated meridional heat transport. The period of the oscillations is about 70–80 yr. The low-frequency variability of the meridional overturning circulation (MOC) contributes substantially to sea surface temperature and sea ice fluctuations in the North Atlantic. The strength of the overturning circulation is related to the convective activity in the deep-water formation regions, most notably the Labrador Sea, and the time-varying control on the freshwater export from the Arctic to the convection sites modulates the overturning circulation. The variability is sustained by an interplay between the storage and release of freshwater from the central Arctic and circulation changes in the Nordic Seas that are caused by variations in the Atlantic heat and salt transport. The relatively high resolution in the deep-water formation region and the Arctic Ocean suggests that a better representation of convective and frontal processes not only leads to an improvement in the mean state but also introduces new mechanisms determining multidecadal variability in large-scale ocean circulation.
    Type of Medium: Online Resource
    ISSN: 1520-0442 , 0894-8755
    URL: Article
    DOI: 10.1175/JCLI3462.1
    RVK:
    UA 4548
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2005
    detail.hit.zdb_id: 246750-1
    detail.hit.zdb_id: 2021723-7
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