GLORIA

GEOMAR Library Ocean Research Information Access

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Online Resource
    Online Resource
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Keywords: Paleoclimatology--Holocene. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (494 pages)
    Edition: 1st ed.
    ISBN: 9783662103135
    Series Statement: GKSS School of Environmental Research Series
    DDC: 551.6/09/01
    Language: English
    Note: GKSS School of Environmental Research -- The Climate in Historical Times -- Copyright -- Preface -- Contents -- List of Contributors -- 1 The Holocene: Considerations with Regard to its Climate and Climate Archives -- 2 Nonlinear Dynamics of the Climate System -- 3 A Discourse About Quasi-realistic Climate Models and Their Applications in Paleoclimatic Studies -- 4 Holocene Climate Variability from Model Simulations - State of the Art -- 5 Marine Paleoclimatology - Motivation, Tools, and Results -- 6 Corals as Climate Archive -- 7 Annually Laminated Lake Sediments and Their Palaeoclimatic Relevance -- 8 Interpreting Climate Proxies from Tree-rings -- 9 The Environmental and Climate Record in Polar Ice Cores -- 10 Reconstructing Large-scale Variability from Palaeoclimatic Evidence by Means of Data Assimilation Through Upscaling and Nudging (DATUN) -- 11 Mid- to Late Holocene Lake Ecosystem Response to Catchment and Climatic Changes- A Detailed Varve Analysis of Lake Holzmaar(Germany) -- 12 Holocene Palaeoclimate in the Saharo-ArabianDesert -- 13 Transfer Functions for PaleoclimateReconstructions - Theory and Methods -- 14 Transfer Functions for Paleoclimate Reconstructions - Applications -- 15 Climate Information from Stable Hydrogenand Carbon Isotopes of C3 Plants - GrowthChamber Experiments and Field Observations -- 16 Detection of Climate Modes as Recorded in a Seasonal-resolution Coral Record Covering the Last 250 Years -- 17 Phase Stability of the Solar Schwabe Cycle in Lake Holzmaar, Germany, and G ISP2, Greenland, between 10,000 and 9,000 cal. BP -- 18 Variable Freshwater Input to the Arctic Ocean During the Holocene: Implications for Large-Scale Ocean-Sea Ice Dynamics as Simulated by a Circulation Model -- 19 Forced Climate Variability During the Last Millennium with the Earth System Model CLIMBER-2. , 20 The Contribution of High-resolution Magnetostratigraphic Analyses to Paleoclimatic Reconstructions -- 21 Internal Climate Variability in Global and Regional Climate Models -- 22 Climate Diagnostics by Adjoint Modelling: A Feasibility Study -- 23 Evidence for the Climate During the Late Maunder Minimum from Proxy Data and Model Simulations Available Within KIHZ -- References -- Index.
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 2
    Publication Date: 2021-03-29
    Description: Microstructures from deep ice cores reflect the dynamic conditions of the drill location as well as the thermodynamic history of the drill site and catchment area in great detail. Ice core parameters (crystal lattice-preferred orientation (LPO), grain size, grain shape), mesostructures (visual stratigraphy) as well as borehole deformation were measured in a deep ice core drilled at Kohnen Station, Dronning Maud Land (DML), Antarctica. These observations are used to characterize the local dynamic setting and its rheological as well as microstructural effects at the EDML ice core drilling site (European Project for Ice Coring in Antarctica in DML). The results suggest a division of the core into five distinct sections, interpreted as the effects of changing deformation boundary conditions from triaxial deformation with horizontal extension to bedrock-parallel shear. Region 1 (uppermost approx. 450 m depth) with still small macroscopic strain is dominated by compression of bubbles and strong strain and recrystallization localization. Region 2 (approx. 450–1700 m depth) shows a girdle-type LPO with the girdle plane being perpendicular to grain elongations, which indicates triaxial deformation with dominating horizontal extension. In this region (approx. 1000 m depth), the first subtle traces of shear deformation are observed in the shape-preferred orientation (SPO) by inclination of the grain elongation. Region 3 (approx. 1700–2030 m depth) represents a transitional regime between triaxial deformation and dominance of shear, which becomes apparent in the progression of the girdle to a single maximum LPO and increasing obliqueness of grain elongations. The fully developed single maximum LPO in region 4 (approx. 2030–2385 m depth) is an indicator of shear dominance. Region 5 (below approx. 2385 m depth) is marked by signs of strong shear, such as strong SPO values of grain elongation and strong kink folding of visual layers. The details of structural observations are compared with results from a numerical ice sheet model (PISM, isotropic) for comparison of strain rate trends predicted from the large-scale geometry of the ice sheet and borehole logging data. This comparison confirms the segmentation into these depth regions and in turn provides a wider view of the ice sheet.
    Keywords: polar ice core; microstructure; borehole deformation; fabric; texture; ice flow modelling ; 551
    Language: English
    Type: article , publishedVersion
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 3
    Publication Date: 2022-03-24
    Description: The landscape of Antarctica, hidden beneath kilometre‐thick ice in most places, has been shaped by the interactions between tectonic and erosional processes. The flow dynamics of the thick ice cover deepened pre‐formed topographic depressions by glacial erosion, but also preserved the subglacial landscapes in regions with moderate to slow ice flow. Mapping the spatial variability of these structures provides the basis for reconstruction of the evolution of subglacial morphology. This study focuses on the Jutulstraumen Glacier drainage system in Dronning Maud Land, East Antarctica. The Jutulstraumen Glacier reaches the ocean via the Jutulstraumen Graben, which is the only significant passage for draining the East Antarctic Ice Sheet through the western part of the Dronning Maud Land mountain chain. We acquired new bed topography data during an airborne radar campaign in the region upstream of the Jutulstraumen Graben to characterise the source area of the glacier. The new data show a deep relief to be generally under‐represented in available bed topography compilations. Our analysis of the bed topography, valley characteristics and bed roughness leads to the conclusion that much more of the alpine landscape that would have formed prior to the Antarctic Ice Sheet is preserved than previously anticipated. We identify an active and deeply eroded U‐shaped valley network next to largely preserved passive fluvial and glacial modified landscapes. Based on the landscape classification, we reconstruct the temporal sequence by which ice flow modified the topography since the beginning of the glaciation of Antarctica.
    Description: Airborne ice‐penetrating radar data reveal the evolution of the subglacial morphology of the Jutulstraumen Glacier drainage system in western Dronning Maud Land. We identify various geomorphological patterns that are related to different stages of subglacial erosion and allow us to reconstruct the temporal sequence by which ice flow modified the topography since the beginning of glaciation of Antarctica.
    Language: English
    Type: doc-type:article
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...