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Title |
New modeling of the Vostok ice flow line and implication for the glaciological chronology of the Vostok ice core |
Type |
Journal Article |
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Year |
2004 |
Publication |
Journal of geophysical research-atmospheres |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
109 |
Issue |
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Pages |
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Keywords  |
glaciology; paleoclimatology; Antarctica; inverse theory; 1827 Hydrology: Glaciology; 3344 Meteorology and Atmospheric Dynamics: Paleoclimatology; 3260 Mathematical Geophysics: Inverse theory; 9310 Information Related to Geographic Region: Antarctica |
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Abstract |
We have used new spaceborne (elevation) and airborne (ice thickness) data to constrain a 2D1/2 model of snow accumulation and ice flow along the Ridge B-Vostok station ice flow line (East Antarctica). We show that new evaluations of the ice flow line geometry (from the surface elevation), ice thickness (from low-frequency radar data), and basal melting and sliding change significantly the chronology of the Vostok ice core. This new Vostok dating model reconciles orbital and glaciological timescales and is in good agreement with the Dome Fuji glaciological timescale. At the same time, the new model shows significantly older ages than the previous GT4 timescale for the last glacial part, being thus in better agreement with the GRIP and GISP2 chronologies. |
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355 |
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Publisher |
American Geophysical Union |
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ISSN |
0148-0227 |
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Approved |
yes |
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Call Number |
IPEV @ Thierry.Lemaire @ |
Serial |
5618 |
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Author |
Masson-Delmotte V, Stenni B, Pol K, Braconnot P, Cattani O, Falourd S, Kageyama M, Jouzel J, Landais A, Minster B, Barnola J M, Chappellaz J, Krinner G, Johnsen S, Rothlisberger R, Hansen J, Mikolajewicz U, Otto-Bliesner B, |
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Title |
EPICA Dome C record of glacial and interglacial intensities
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Type |
Journal Article |
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Year |
2010 |
Publication |
Quaternary Science Reviews |
Abbreviated Journal |
Quat Sci Rev |
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Volume |
29 |
Issue |
1-2 |
Pages |
113 -128 |
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Keywords |
glaciology, meteorology climatology, |
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Abstract |
Climate models show strong links between Antarctic and global temperature both in future and in glacial climate simulations. Past Antarctic temperatures can be estimated from measurements of water stable isotopes along the EPICA Dome C ice core over the past 800 000 years. Here we focus on the reliability of the relative intensities of glacial and interglacial periods derived from the stable isotope profile. The consistency between stable isotope-derived temperature and other environmental and climatic proxies measured along the EDC ice core is analysed at the orbital scale and compared with estimates of global ice volume. MIS 2,12 and 16 appear as the strongest glacial maxima, while MIS 5.5 and 11 appear as the warmest interglacial maxima. The links between EDC temperature, global temperature, local and global radiative forcings are analysed. We show: (i) a strong but changing link between EDC temperature and greenhouse gas global radiative forcing in the first and second part of the record; (ii) a large residual signature of obliquity in EDC temperature with a 5 ky lag; (iii) the exceptional character of temperature variations within interglacial periods. Focusing on MIS 5.5, the warmest interglacial of EDC record, we show that orbitally forced coupled climate models only Simulate a precession-induced shift of the Antarctic seasonal cycle of temperature. While they do capture annually persistent Greenland warmth, models fail to capture the warming indicated by Antarctic ice core delta D. We suggest that the model-data mismatch may result from the lack of feedbacks between ice sheets and climate including both local Antarctic effects due to changes in ice sheet topography and global effects due to meltwater-thermohaline circulation interplays. An MIS 5.5 sensitivity study conducted with interactive Greenland melt indeed induces a slight Antarctic warming. We suggest that interglacial EDC optima are caused by transient heat transport redistribution comparable with glacial north-south seesaw abrupt climatic changes. (C) 2009 Elsevier Ltd. All rights reserved.
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458 |
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Pergamon-Elsevier |
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ISSN |
0277-3791 |
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Approved |
yes |
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Serial |
1987 |
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Author |
Gagliardini O, Durand G, Zwinger T, Hindmarsh R C A, Le Meur E, |
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Title |
Coupling of ice-shelf melting and buttressing is a key process in ice-sheets dynamics
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Type |
Journal Article |
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Year |
2010 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
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Volume |
37 |
Issue |
14 |
Pages |
1 -5 |
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Keywords |
glaciology, meteorology climatology, |
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Abstract |
Increase in ice-shelf melting is generally presumed to have triggered recent coastal ice-sheet thinning. Using a full-Stokes finite element model which includes a proper description of the grounding line dynamics, we investigate the impact of melting below ice shelves. We argue that the influence of ice-shelf melting on the ice-sheet dynamics induces a complex response, and the first naive view that melting inevitably leads to loss of grounded ice is erroneous. We demonstrate that melting acts directly on the magnitude of the buttressing force by modifying both the area experiencing lateral resistance and the ice-shelf velocity, indicating that the decrease of back stress imposed by the ice-shelf is the prevailing cause of inland dynamical thinning. We further show that feedback from melting and buttressing forces can lead to nontrivial results, as an increase in the average melt rate may lead to inland ice thickening and grounding line advance. Citation: Gagliardini, O., G. Durand, T. Zwinger, R. C. A. Hindmarsh, and E. Le Meur (2010), Coupling of ice-shelf melting and buttressing is a key process in ice-sheets dynamics, Geophys. Res. Lett., 37, L14501, doi:10.1029/2010GL043334.
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Programme |
1053 |
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Publisher |
American Geophysical Union |
Place of Publication |
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ISSN |
0094-8276 |
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yes |
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Call Number |
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Serial |
2583 |
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Title |
Enhancement factors for grounded ice and ice shelves inferred from an anisotropic ice-flow model
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Type |
Journal Article |
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Year |
2010 |
Publication |
Journal Of Glaciology |
Abbreviated Journal |
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Volume |
56 |
Issue |
199 |
Pages |
805 -812 |
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Keywords |
glaciology, |
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Abstract |
Polar ice is known to be one of the most anisotropic natural materials. For a given fabric the polycrystal viscous response is strongly dependent on the actual state of stress and strain rate. Within an ice sheet, grounded-ice parts and ice shelves have completely different stress regimes, so one should expect completely different impacts of ice anisotropy on the flow. The aim of this work is to quantify, through the concept of enhancement factors, the influence of ice anisotropy on the flow of grounded ice and ice shelves. For this purpose, a full-Stokes anisotropic marine ice-sheet flowline model is used to compare isotropic and anisotropic diagnostic velocity fields on a fixed geometry. From these full-Stokes results, we propose a definition of enhancement factors for grounded ice and ice shelves, coherent with the asymptotic models used for these regions. We then estimate realistic values for the enhancement factors induced by ice anisotropy for grounded ice and ice shelves.
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Programme |
458 |
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Publisher |
International Glaciological Society |
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ISSN |
0022-1430 |
ISBN |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
2460 |
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Author |
O. Alemany, P. Talalay, P. Boissonneau, J. Chappellaz, J. F. Chemin, R. Duphil, E. Lefebvre, L. Piard, P. Possenti, J. Triest |
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Title |
The SUBGLACIOR drilling probe: hydraulic considerations |
Type |
Journal |
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Year |
2021 |
Publication |
Annals of Glaciology |
Abbreviated Journal |
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Volume |
62 |
Issue |
84 |
Pages |
131-142 |
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Keywords |
Glaciological instruments and methods ice coring ice engineering paleoclimate |
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Abstract |
Using significant technological breakthroughs and unconventional approaches, the goal of the in situ probing of glacier ice for a better understanding of the orbital response of climate (SUBGLACIOR) project is to advance ice core research by inventing, constructing and testing an in situ probe to evaluate if a target site is suitable for recovering ice as old as 1.5 million years. Embedding a laser spectrometer, the probe is intended to make its own way down into the ice and to measure, in real time and down to the bedrock, the depth profiles of the ice ?D water isotopes as well as the trapped CH4 gas concentration and dust concentration. The probe descent is achieved through electromechanical drilling combined with continuous meltwater sample production using a central melting finger in the drill head. A key aspect of the project lies in the design and implementation of an efficient method to continuously transfer to the surface the ice chips being produced by the drill head and from the refreezed water expulsed downstream from the melting finger, into the borehole. This paper presents a detailed calculation and analysis of the flow rates and pressure conditions required to overcome friction losses of the drilling fluid and to effectively transport ice chips to the surface. |
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Programme |
119 |
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ISSN |
0260-3055, 1727-5644 |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
8234 |
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Author |
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Title |
Fast and partitioned postglacial rebound of southwestern Iceland |
Type |
Journal Article |
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Year |
2008 |
Publication |
Tectonics |
Abbreviated Journal |
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Volume |
27 |
Issue |
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Pages |
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Keywords |
glacio-isostasy; rebound; rheology; 5475 Planetary Sciences: Solid Surface Planets: Tectonics; 5416 Planetary Sciences: Solid Surface Planets: Glaciation; 4556 Oceanography: Physical: Sea level: variations and mean; 8033 Structural Geology: Rheology: mantle |
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Abstract |
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Programme |
316 |
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Publisher |
American Geophysical Union |
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Edition |
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ISSN |
0278-7407 |
ISBN |
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Approved |
yes |
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Call Number |
IPEV @ Thierry.Lemaire @ |
Serial |
5569 |
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Author |
Techow NMSM, ORyan C, Phillips RA, Gales R, Marin M, Patterson-Fraser D, Quintana F, Ritz MS, Thompson DR, Wanless RM, Weimerskirch H, Ryan PG, |
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Title |
Speciation and phylogeography of giant petrels Macronectes
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Type |
Journal Article |
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Year |
2010 |
Publication |
Molecular Phylogenetics and Evolution |
Abbreviated Journal |
1055-7903 |
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Volume |
54 |
Issue |
2 |
Pages |
472-487 |
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Keywords |
Giant Petrels, Microsatellite, Cytochrome b, Macronectes, Genetic differentiation, Genetic diversity, Species, |
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Abstract |
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Programme |
109 |
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ISSN |
1055-7903 |
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Approved |
yes |
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Call Number |
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Serial |
3059 |
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Author |
Gaia Piccioni, Denise Dettmering, Wolfgang Bosch, Florian Seitz |
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Title |
TICON: TIdal CONstants based on GESLA sea-level records from globally located tide gauges |
Type |
Journal |
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Year |
2019 |
Publication |
Geoscience Data Journal |
Abbreviated Journal |
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Volume |
6 |
Issue |
2 |
Pages |
97-104 |
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Keywords |
GESLA tide gauge tides |
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Abstract |
The TICON (TIdal CONstants) dataset contains harmonic constants of 40 tidal constituents computed for 1,145 tide gauges distributed globally. The tidal estimations are based on publicly available sea level records of the second version of the Global Extreme Sea Level Analysis (GESLA) project and were derived through a least squares-based harmonic analysis on the single time series. A preliminary screening was performed on all records to exclude doubtful observations. Only the records containing more than 70% of valid measurements were processed, that correspond to 89.7% of the total 1,276 original public GESLA records. The results are stored in a text file, and include additional information on the position of the stations, the starting and ending years of the analysed record, the estimated error of the fit, a code that corresponds to the source of the record and additional information on the single time series. In ocean tide models, data from in situ stations are used for validation purposes, and TICON is a useful and easy-to-handle data set that allows the users to select the records according to different criteria most suitable for their purposes. The data are provided with DOI identification in the PANGAEA repository. |
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Programme |
688 |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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ISSN |
2049-6060 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
8616 |
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Author |
Renac Christophe, Moine Bertrand, Goudour Jean-Pierre, LeRomancer Marc, Perrache Chantal |
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Title |
Stable isotope study of rainfall, river drainage and hot springs of the kerguelen archipelago, SW Indian Ocean |
Type |
Journal |
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Year |
2020 |
Publication |
Geothermics |
Abbreviated Journal |
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Volume |
83 |
Issue |
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Pages |
101726 |
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Keywords |
Geothermal springs Kerguelen archipelago Stable isotope composition Water-Rock interaction |
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Abstract |
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Programme |
408,444 |
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Thesis |
Bachelor's thesis |
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Place of Publication |
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Summary Language |
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Abbreviated Series Title |
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Edition |
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ISSN |
0375-6505 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
8262 |
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Author |
Charlotte Bruland, Celine Hadziioannou |
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Title |
Gliding tremors associated with the 26 second microseism in the Gulf of Guinea |
Type |
Journal |
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Year |
2023 |
Publication |
Communications Earth & Environment |
Abbreviated Journal |
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Volume |
4 |
Issue |
1 |
Pages |
1-9 |
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Keywords |
Geophysics Seismology Volcanology |
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Abstract |
A location in the Gulf of Guinea, which emits monochromatic seismic waves at 26-second period, seemingly continuously, was identified in the 1960s. However, the origin of these seismic waves remains enigmatic to date. Here we use three-component data from two seismic arrays in Africa, as well as additional seismic data compiled from around the world, to investigate the tremors. We identify frequency glides accompanying the previously known 26 s microseism which start at the same frequency and originate in the same, fixed location in the Gulf of Guinea. The stable characteristics of the tremors, their low frequency range, the implied large spatial scale, and the decades-long timescales where this phenomenon seems to have been active, all point towards a gap in our understanding of long period oceanic and volcanic signals. Since tremor is an important tool to monitor volcanoes, understanding this phenomenon may affect future forecasting of volcanic activity. |
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Programme |
133 |
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Edition |
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ISSN |
2662-4435 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
8536 |
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