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  • 1
    Online Resource
    Online Resource
    Methane and environmental change during the Paleocene-Eocene thermal maximum (PETM): Modeling the PETM onset as a two-stage event : METHANE AND PETM ENVIRONMENTAL CHANGE
    American Geophysical Union (AGU) ; 2011
    In:  Geophysical Research Letters Vol. 38, No. 5 ( 2011-03-16), p. n/a-n/a
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 38, No. 5 ( 2011-03-16), p. n/a-n/a
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/2010GL046038
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2011
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  • 2
    Online Resource
    Online Resource
    Re-tuning the Walker-Kasting global carbon cycle box model using a parameter sensitivity analysis
    McGill University Library and Archives ; 2010
    In:  McGill Science Undergraduate Research Journal Vol. 5, No. 1 ( 2010-03-31), p. 67-72
    Details
    In: McGill Science Undergraduate Research Journal, McGill University Library and Archives, Vol. 5, No. 1 ( 2010-03-31), p. 67-72
    Abstract: introduction: The Walker-Kasting global carbon cycle box model is a simple representation of the earth system used to study climatic events. This model has a high number of parameters whose sensitivity must be tested in order to better understand which of them dominate the behaviour of the model. In this study, we perform a parameter sensitivity analysis. moreover, we use these results to re-tune the model to preindustrial conditions using a quantitative criterion. We then compare our results to those determined by Walker-Kasting. Methods: We achieved the parameter sensitivity analysis by calculating, for each parameter, an index that measures the impact of a change in the initial parameter value on the equilibrium solutions. The most sensitive parameters were determined and then tuned in the model by comparing the model equilibrium solutions to a set of 32 experimental values. results: We found that nine of the tuning parameters were sensitive to a change to their initial value. Furthermore, we discovered that 5 of these parameter values were identical to those determined by Walker-Kasting, thus affirming their work. discussion: a sensitivity analysis is interesting to perform because it allows the users of a model to more fully comprehend the way in which the model reacts to changes in its parameters. sensitivity analysis is fundamental in the tuning of a model (for example, to a particular period in the earth’s history) since it allows researchers to consider only the most important parameters.
    Type of Medium: Online Resource
    ISSN: 1718-0783 , 1718-0775
    URL: Article
    DOI: 10.26443/msurj.v5i1.88
    Language: Unknown
    Publisher: McGill University Library and Archives
    Publication Date: 2010
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  • 3
    Online Resource
    Online Resource
    An interdecadal climate cycle in the South Atlantic and its links to other ocean basins
    American Geophysical Union (AGU) ; 1998
    In:  Journal of Geophysical Research: Oceans Vol. 103, No. C11 ( 1998-10-15), p. 24723-24736
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 103, No. C11 ( 1998-10-15), p. 24723-24736
    Abstract: A singular value decomposition analysis and a combined complex empirical orthogonal function analysis are performed on 80 years of monthly sea surface temperature (SST) and sea level pressure (SLP) data from the South Atlantic region. The analyses reveal the existence of interdecadal fluctuations in the coupled atmosphere‐ocean system with a period of around 20 years. The SST anomalies are observed to propagate anticyclonically around the South Atlantic basin following the subtropical gyre circulation. At the same time, a westward propagation of SLP anomalies across the basin generates changes in the atmospheric circulation that appear to reinforce such SST anomalies through anomalous exchanges of heat. It is thus proposed that the dominant physical processes involved in this interdecadal cycle include the horizontal advection of heat by the ocean currents and changes in the atmosphere‐ocean heat fluxes through local air‐sea interactions. The global SST and SLP patterns that accompany the different phases of the South Atlantic cycle are also presented. They show similarities with other well‐known interdecadal signals observed by several investigators in other ocean basins (e.g., the low‐frequency part of the North Atlantic Oscillation). This suggests that the South Atlantic signal described in this study may be a regional aspect of global interdecadal variability.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/98JC02443
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1998
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    SSG: 16,13
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  • 4
    Online Resource
    Online Resource
    Evidence for interannual and interdecadal climate variability in the South Atlantic
    American Geophysical Union (AGU) ; 1996
    In:  Geophysical Research Letters Vol. 23, No. 19 ( 1996-09-15), p. 2673-2676
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 23, No. 19 ( 1996-09-15), p. 2673-2676
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/96GL02373
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1996
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    SSG: 16,13
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  • 5
    Online Resource
    Online Resource
    Correction to “Evidence for interannual and interdecadal climate variability in the South Atlantic”
    American Geophysical Union (AGU) ; 1996
    In:  Geophysical Research Letters Vol. 23, No. 23 ( 1996-11-15), p. 3425-3425
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 23, No. 23 ( 1996-11-15), p. 3425-3425
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/96GL03147
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1996
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    detail.hit.zdb_id: 7403-2
    SSG: 16,13
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  • 6
    Online Resource
    Online Resource
    Can increased poleward oceanic heat flux explain the warm Cretaceous climate?
    American Geophysical Union (AGU) ; 1996
    In:  Paleoceanography Vol. 11, No. 5 ( 1996-10), p. 579-593
    Details
    In: Paleoceanography, American Geophysical Union (AGU), Vol. 11, No. 5 ( 1996-10), p. 579-593
    Abstract: The poleward transport of heat in the mid‐Cretaceous (100 Ma) is examined using an idealized coupled ocean‐atmosphere model. The oceanic component consists of two zonally averaged basins representing the proto‐Pacific and proto‐Indian oceans and models the dynamics of the meridional thermohaline circulation. The atmospheric component is a simple energy and moisture balance model which includes the diffusive meridional transport of sensible heat and moisture. The ocean model is spun up with a variety of plausible Cretaceous surface temperature and salinity profiles, and a consistent atmosphere is objectively derived based on the resultant sea surface temperature and the surface heat and freshwater fluxes. The coupled model does not exhibit climate drift. Multiple equilibria of the coupled model are found that break the initial symmetry of the ocean circulation; several of these equilibria have one‐cell (northern or southern sinking) thermohaline circulation patterns. Two main classes of circulation are found: circulations where the densest water is relatively cool and is formed at the polar latitudes and circulations where the densest water is warm, but quite saline, and the strongest sinking occurs at the tropics. In all cases, significant amounts of warm, saline bottom water are formed in the proto‐Indian basin which modify the deepwater characteristics in the larger (proto‐Pacific) basin. Temperatures in the deep ocean are warm, 10°–17°C, in agreement with benthic foraminiferal oxygen isotope data. The poleward transport of heat in the modeled Cretaceous oceans is larger than in some comparable models of the present day thermohaline circulation and significantly larger than estimates of similar processes in the present‐day ocean. It is consistently larger in the polar sinking cases when compared with that seen in the tropical sinking cases, but this represents an increase of only 10%. The largest increase over present‐day model transports is in the atmospheric latent heat transport, where an increased hydrological cycle (especially in the tropical sinking cases) contributes up to an extra 1 PW of poleward heat transport. Better constraints on the oceanic deepwater circulation during this period are necessary before the meridional circulation can be unambiguously described.
    Type of Medium: Online Resource
    ISSN: 0883-8305 , 1944-9186
    URL: Article
    DOI: 10.1029/96PA01851
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1996
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    SSG: 16,13
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  • 7
    Online Resource
    Online Resource
    Decadal climate oscillations in the Arctic: A new feedback loop for atmosphere-ice-ocean interactions
    American Geophysical Union (AGU) ; 1998
    In:  Geophysical Research Letters Vol. 25, No. 19 ( 1998-10-01), p. 3607-3610
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 25, No. 19 ( 1998-10-01), p. 3607-3610
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/98GL02782
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1998
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    SSG: 16,13
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  • 8
    Online Resource
    Online Resource
    Decadal‐to‐interdecadal fluctuations of arctic sea‐ice cover and the atmospheric circulation during 1954–1994
    Informa UK Limited ; 1999
    In:  Atmosphere-Ocean Vol. 37, No. 4 ( 1999-12), p. 389-415
    Details
    In: Atmosphere-Ocean, Informa UK Limited, Vol. 37, No. 4 ( 1999-12), p. 389-415
    Type of Medium: Online Resource
    ISSN: 0705-5900 , 1480-9214
    URL: Article
    DOI: 10.1080/07055900.1999.9649633
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 1999
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    SSG: 16,13
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  • 9
    Online Resource
    Online Resource
    Is There a Dominant Timescale of Natural Climate Variability in the Arctic?
    American Meteorological Society ; 2000
    In:  Journal of Climate Vol. 13, No. 19 ( 2000-10), p. 3412-3434
    Details
    In: Journal of Climate, American Meteorological Society, Vol. 13, No. 19 ( 2000-10), p. 3412-3434
    Type of Medium: Online Resource
    ISSN: 0894-8755 , 1520-0442
    URL: Article
    DOI: 10.1175/1520-0442(2000)013〈3412:ITADTO〉2.0.CO;2
    RVK:
    UA 4548
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2000
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    detail.hit.zdb_id: 2021723-7
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  • 10
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    A tracer study of the Arctic Ocean's liquid freshwater export variability
    American Geophysical Union (AGU) ; 2010
    In:  Journal of Geophysical Research Vol. 115, No. C7 ( 2010-07-23)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 115, No. C7 ( 2010-07-23)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2009JC005873
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2010
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    SSG: 16,13
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