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  • Nature Research  (2)
  • AMER METEOROLOGICAL SOC  (1)
  • AMS (American Meteorological Society)  (1)
  • Hamburg : [Max Planck Institut für Meteorologie]  (1)
  • 1
    Online Resource
    Online Resource
    PAlaeo-Constraints on Monsoon Evolution and Dynamics (PACMEDY) : Abschlussbericht : Berichtszeitraum: 1. Juli 2016-31. Mai 2020 (2020)
    Hamburg : [Max Planck Institut für Meteorologie]
    Details Availability
    Keywords: Forschungsbericht ; Paläoklima ; Modell
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (14 Seiten, 1,14 MB) , Diagramme
    URL: https://doi.org/10.2314/KXP:1760478334
    DOI: 10.2314/KXP:1760478334
    Language: German
    Note: Förderkennzeichen BMBF 01LP1607B , Verbundnummer 01172249 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden
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  • 2
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    Cyclogenesis in the Denmark Strait Overflow Plume (2001)
    AMS (American Meteorological Society)
    In:  Journal of Physical Oceanography, 31 (11). pp. 3214-3229.
    Details
    Publication Date: 2018-04-06
    Description: A densely spaced hydrographic survey of the northern Irminger Basin together with satellite-tracked near-surface drifters confirm the intense mesoscale variability within and above the Denmark Strait overflow. In particular, the drifters show distinct cyclonic vortices over the downslope edge of the outflow plume. Growing perturbations such as these can be attributed to the baroclinic instability of a density current. A primitive equation model with periodic boundaries is used to simulate the destabilization of an idealized dense filament on a continental slope that resembles the northeastern Irminger Basin. Unstable waves evolve rapidly if the initial temperature profile is perturbed with a sinusoidal anomaly that exceeds a certain cutoff wavelength. As the waves grow to large amplitudes isolated eddies of both signs develop. Anticyclones form initially within the dense filament and are rich in overflow water. In contrast, cyclones form initially with their center in the ambient water but wrap outflow water around their center, thus containing a mixture of both water types. The nonlinear advection of waters that were originally located within the front between both water masses contributes most significantly to the stronger intensification of the cyclones in comparison with anticyclones. The frontal waters carry positive relative vorticity into the center of the cyclone. The process bears therefore some resemblance to atmospheric frontal cyclogenesis. After saturation there is a bottom jet of overflow water that is confined by counterrotating eddies: anticyclones upslope and cyclones downslope of the overflow core. The parameter dependence of the maximum growth rate is studied, and the implications of eddy-induced mixing for the water mass modification is discussed.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1175/1520-0485(2001)031〈3214:CITDSO〉2.0.CO;2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Global temperature modes shed light on the Holocene temperature conundrum (2020)
    Nature Research
    Details
    Publication Date: 2023-02-08
    Description: Reconstructions of the global mean annual temperature evolution during the Holocene yield conflicting results. One temperature reconstruction shows global cooling during the late Holocene. The other reconstruction reveals global warming. Here we show that both a global warming mode and a cooling mode emerge when performing a spatio-temporal analysis of annual temperature variability during the Holocene using data from a transient climate model simulation. The warming mode is most pronounced in the tropics. The simulated cooling mode is determined by changes in the seasonal cycle of Arctic sea-ice that are forced by orbital variations and volcanic eruptions. The warming mode dominates in the mid-Holocene, whereas the cooling mode takes over in the late Holocene. The weighted sum of the two modes yields the simulated global temperature trend evolution. Our findings have strong implications for the interpretation of proxy data and the selection of proxy locations to compute global mean temperatures.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Coupled stratosphere-troposphere-Atlantic multidecadal oscillation and its importance for near-future climate projection (2022)
    Nature Research
    Details
    Publication Date: 2024-02-07
    Description: Northern Hemisphere (NH) climate has experienced various coherent wintertime multidecadal climate trends in stratosphere, troposphere, ocean, and cryosphere. However, the overall mechanistic framework linking these trends is not well established. Here we show, using long-term transient forced coupled climate simulation, that large parts of the coherent NH-multidecadal changes can be understood within a damped coupled stratosphere/troposphere/ocean-oscillation framework. Wave-induced downward propagating positive stratosphere/troposphere-coupled Northern Annular Mode (NAM) and associated stratospheric cooling initiate delayed thermohaline strengthening of Atlantic overturning circulation and extratropical Atlantic-gyres. These increase the poleward oceanic heat transport leading to Arctic sea-ice melting, Arctic warming amplification, and large-scale Atlantic warming, which in turn initiates wave-induced downward propagating negative NAM and stratospheric warming and therefore reverse the oscillation phase. This coupled variability improves the performance of statistical models, which project further weakening of North Atlantic Oscillation, North Atlantic cooling and hiatus in wintertime North Atlantic-Arctic sea-ice and global surface temperature just like the 1950s-1970s.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Polar-lower latitude linkages and their role in weather and climate prediction (2015)
    AMER METEOROLOGICAL SOC
    In:  EPIC3Bulletin of the American Meteorological Society, AMER METEOROLOGICAL SOC, ISSN: 0003-0007
    Details
    Publication Date: 2015-06-11
    Description: International Workshop on Polar-lower Latitude Linkages in Weather and Climate Prediction What: Eighty experts from twenty different countries met to assess recent progress in, and new directions for, our understanding of the mechanisms governing polar-lower latitude linkages and their role in weather and climate prediction including services. When: 10–12 December 2014 Where: Barcelona, Spain
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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