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  • Other Sources  (12)
  • 2010-2014  (12)
  • 1
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    Reduction of Near-Inertial energy through the dependence of wind stress on the Ocean-Surface velocity (2013)
    AGU (American Geophysical Union) | Wiley
    In:  Journal of Geophysical Research: Oceans, 118 . pp. 2761-2773.
    Details
    Publication Date: 2018-02-27
    Description: A realistic primitive-equation model of the Southern Ocean at eddying spatial resolution is used to examine the effect of ocean-surface-velocity dependence of the wind stress on the strength of near-inertial oscillations. Accounting for the ocean-surface-velocity dependence of the wind stress leads to a large reduction of wind-induced near-inertial energy of approximately 40 percent and of wind power input into the near-inertial frequency band of approximately 20 percent. A large part of this reduction can be explained by the leading-order modification to the wind stress if the ocean-surface velocity is included. The strength of the reduction is shown to be modulated by the inverse of the ocean-surface-mixed-layer depth. We conclude that the effect of surface-velocity dependence of the wind stress should be taken into account when estimating the wind-power input into the near-inertial frequency band and when estimating near-inertial energy levels in the ocean due to wind forcing.
    Type: Article , PeerReviewed
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  • 2
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    Transport driven by eddy momentum fluxes in the Gulf Stream Extension region (2010)
    AGU (American Geophysical Union)
    In:  Geophysical Research Letters, 37 . L24401.
    Details
    Publication Date: 2017-06-13
    Description: The importance of the Gulf Stream Extension region in climate and seasonal prediction research is being increasingly recognised. Here we use satellite-derived eddy momentum fluxes to drive a shallow water model for the North Atlantic Ocean that includes the realistic ocean bottom topography. The results show that the eddy momentum fluxes can drive significant transport, sufficient to explain the observed increase in transport of the Gulf Stream following its separation from the coast at Cape Hatteras, as well as the observed recirculation gyres. The model also captures recirculating gyres seen in the mean sea surface height field within the North Atlantic Current system east of the Grand Banks of Newfoundland, including a representation of the Mann Eddy.
    Type: Article , PeerReviewed
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  • 3
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    A new multibeam approach about spatial mapping of shallow gas. (2012)
    In:  [Talk] In: 6. Scientific Work Group Meeting &COST Action ES0902 PERGAMON 7th Management Committee Meeting, 5.-7.11.2012, Gent, Belgium .
    Details
    Publication Date: 2012-10-25
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 4
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    A low frequency multibeam assessment: Spatial mapping of shallow gas by enhanced penetration and angular response anomaly (2013)
    Elsevier
    In:  Marine and Petroleum Geology, 44 . pp. 217-222.
    Details
    Publication Date: 2017-10-04
    Description: This study highlights the potential of using a low frequency multibeam echosounder for detection and visualization of shallow gas occurring several meters beneath the seafloor. The presence of shallow gas was verified in the Bornholm Basin, Baltic Sea, at 80 m water depth with standard geochemical core analysis and hydroacoustic subbottom profiling. Successively, this area was surveyed with a 95 kHz and a 12 kHz multibeam echosounder (MBES). The bathymetric measurements with 12 kHz provided depth values systematically deeper by several meters compared to 95 kHz data. This observation was attributed to enhanced penetration of the low frequency signal energy into soft sediments. Consequently, the subbottom geoacoustic properties contributed highly to the measured backscattered signals. Those appeared up to 17 dB higher inside the shallow gas area compared to reference measurements outside and could be clearly linked to the shallow gas front depth down to 5 meter below seafloor. No elevated backscatter was visible in 95 kHz MBES data, which in turn highlights the superior potential of low frequency MBES to image shallow sub-seafloor features. Small gas pockets could be resolved even on the outer swath (up to 65°). Strongly elevated backscattering from gassy areas occurred at large incidence angles and a high gas sensitivity of the MBES is further supported by an angular response analysis presented in this study. We conclude that the MBES together with subbottom profiling can be used as an efficient tool for spatial subbottom mapping in soft sediment environments.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
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  • 5
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    Tectonic control on submarine mass wasting off Central Chile (2012)
    In:  [Talk] In: The Lübeck Retreat, Collaborative Research SFB 574 Volatiles and Fluids in Subduction Zones: Climate Feedback and Trigger Mechanisms for Natural Disasters, 23.-25.05.2012, Lübeck . The Lübeck Retreat: final colloquium of SFB 574; May 23-25, 2012: program & abstracts ; pp. 35-36 .
    Details
    Publication Date: 2012-09-21
    Description: Submarine landslides are an important but underestimated geological hazard. They can destroy offshore installations like cables and oil platforms, and generate destructive tsunamis that can devastate populated shorelines regionally. Off Central and Southern Chile more than 60 submarine landslides were identified based on a unique bathymetric dataset that was continuously extended and refined over 16 years and 16 scientific cruises and that now covers ~ 90% of the continental margin. Despite of the good documentation, still little is known about the mechanisms that caused the individual slope failure events, about the frequency of such events and their relation to the powerful earthquakes that happen here each 50-100 years.To investigate the preconditioning and triggering mechanisms for the landslides we combine the highresolution swath bathymetric data set with reflection seismic profiles and sediment-echosounder data.In particular we focus on how the tectonic regime, that significantly varies along-strike, impacts on thetype, shape and frequency of slope failures. Furthermore, we investigate how the direct and instantaneous seismic loading generated by the magnitude 8.8 Maule Earthquake that ruptured partsof the study area on the 27 February of 2010 impacted on the slope stability. Such a comparison is possible as we mapped the rupture area bathymetrically before and shortly after the earthquake. Our results indicate that the spatial occurrence of two groups of landslides - lower slope collapses and failures that affect the entire slope - are closely related to the tectonic segmentation of the forearc, and that the long-time tectonic stress regime is a major factor preconditioning slope failure. The seismic loading by the Maule earthquake, on the other hand had surprisingly little effect in triggering km-size submarine landslides, albeit steep slopes, ubiquiteous mass wasting of the past and extreme vertical acceleration in the rupture area.
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 6
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    Gasblasen - Imaging (2012)
    In:  [Talk] In: Konferenz Schall und Schwingungen, Wellen und Turbulenz in sensibler Umgebung, 17.-20.09.2012, Kiel .
    Details
    Publication Date: 2012-10-23
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 7
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    On the spatial and temporal distribution of near-inertial energy in the Southern Ocean (2014)
    AGU (American Geophysical Union) | Wiley
    In:  Journal of Geophysical Research: Oceans, 119 (1). pp. 359-376.
    Details
    Publication Date: 2019-09-23
    Description: We use an eddying realistic primitive equation model of the Southern Ocean to examine the spatial and temporal distribution of near-inertial wind-power input (WPI) and near-inertial energy (NIE) in the Southern Ocean. We find that the modelled near-inertial WPI is almost proportional to inertial wind-stress variance (IWSV), while the modelled NIE is modulated by the inverse of the mixed-layer depth. We go on to assess recent decadal trends of near-inertial WPI from trends of IWSV based on reanalysis wind-stress. Averaged over the Southern Ocean, annual-mean IWSV is found to have increased by 16 percent over the years 1979 through 2011. Part of the increase of IWSV is found to be related to the positive trend of the Southern Annular Mode over the same period. Finally, we show that there are horizontal local maxima of NIE at depth that are almost exclusively associated with anticyclonic eddies.
    Type: Article , PeerReviewed
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  • 8
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    The influence of ocean-surface-velocity-dependent wind stress on the dynamics of the Southern Ocean: The near-inertial and the sub-inertial response (2013)
    In:  (PhD/ Doctoral thesis), Christian-Albrechts-Universität Kiel, Kiel, Germany, 113 pp
    Details
    Publication Date: 2019-09-23
    Description: This thesis examines the consequences of the ocean-surface-velocity dependence of the wind stress (SVD) for the dynamics of the Southern Ocean. It does so by comparing the output from eddying ocean-model experiments that only differ in the way the wind stress is parameterized. The thesis consists of three separate research papers. The first paper assesses the influence of SVD on the near-inertial variability. It is shown that SVD leads to a substantial reduction of horizontally averaged near-inertial energy (NIE) and of horizontally averaged wind power input (WPI) into the near-inertial frequency band. The observed reduction of NIE and near-inertial WPI is explained by the fact that SVD, to leading order, adds a linear damping term to the momentum equation governing near-inertial oscillations in the mixed-layer. This damping term is inversely proportional to the mixed-layer depth and hence the effect of SVD on near-inertial oscillations is found to be largest if the mixed-layer is shallow. The second paper assesses the influence of SVD on sub-inertial time scales. It is found that SVD also substantially reduces sub-inertial WPI and mesoscale eddy kinetic energy (EKE). The largest effect of SVD on sub-inertial WPI and EKE is found along the path of the Antarctic Circumpolar Current (ACC). SVD is found to generally damp the amplitude of monthly to inter-annual variability in the model, without affecting the time-dependence of the wind stress, of WPI, and of the strength of the ACC. SVD is, however, found to have only a minor impact on the path and strength of the ACC. The third paper connects to the first one by focussing on the spatial and temporal distribution of NIE and near-inertial WPI in the Southern Ocean. The modelled near-inertial WPI is found to be mainly governed by the variability of the wind-stress at the local inertial frequency (IWSV). This relationship is used to indirectly examine the temporal evolution of near-inertial WPI on time scales much longer than those which can be directly examined with the model. It is found that from 1979 to 2011 IWSV over the Southern Ocean has increased substantially. Furthermore, the inter-annual variability of IWSV in the Southern Ocean is shown to be largely governed by the Southern Annular Mode.
    Type: Thesis , NonPeerReviewed
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  • 9
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    Interannual Variability of Wind Power Input to near-inertial Currents in the North Atlantic (2014)
    In:  [Poster] In: Atmosphere and Ocean Dynamics: A Scientific Workshop to Celebrate Professor Dr Richard Greatbatch's 60th Birthday, 10.-11.04.2014, Liverpool, UK .
    Details
    Publication Date: 2015-01-05
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 10
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    Die plio- und pleistozänen Schotter der Wutach-Donau am Ost-Schwarzwald (2011)
    Geozon Science Media
    Details
    Publication Date: 2021-03-29
    Description: Die Wutach-Terrassenschotter, die den Fluß als dessen letzte Bildung vor seinem Überlaufen zum Hochrhein in der Würm-Kaltzeit zwischen seinem Austritt aus dem Gebirge und der einstigen Überlaufstelle in talab zunehmender Höhe über seiner jungen Schlucht begleiten, stellen bildungsmäßig keine Einheit („Niederterrasse") dar. Sie weisen eine deutliche Gliederung auf in zwei glazifluviale Schotterkörper, die durch eine Diskordanz, stellenweise durch augenscheinlich nicht kaltzeitliche feinklastische Bildungen voneinander getrennt sind und sich in ihrem Konservierungsgrad merklich voneinander unterscheiden. Es wird versucht, die Schotterkörper den beiden jüngsten pleistozänen Kaltzeiten zuzuordnen. Anschließend erfolgt eine Darstellung der älteren Wutachschotter und eine Besprechung von deren mutmaßlicher Altersstellung auf der Grundlage von in den letzten Jahren erfolgten Untersuchungen.
    Description: research
    Keywords: 551.7 ; VAR 000 ; Glazialgeologie ; pleistozän ; pliozän ; rhein ; donau ; schotter ; schwarzwald ; wutach ; feldberg ; waldshut
    Language: German
    Type: article , publishedVersion
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