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Journal Article |
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Year |
2013 |
Publication |
Clim. Past |
Abbreviated Journal |
Clim. Past |
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Volume |
9 |
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Pages |
1715-1731 |
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902 |
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1814-9324 |
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yes |
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4534 |
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Author |
Luca Vittuari, Catherine Ritz and Hugh Corr
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Title |
Studying ice-flows around Dome C (Antarctica): an old history of global climate |
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Conference - National - Communication |
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Year |
2014 |
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902 |
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yes |
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5221 |
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Author |
Fischer H, Severinghaus J, Brook E, Wolff E, Albert M, Alemany O, Arthern R, Bentley C, Blankenship D, Chappellaz J, Creyts T, Dahl-Jensen D, Dinn M, Frezzotti M, Fujita S, Gallee H, Hindmarsh R, Hudspeth D, Jugie G, Kawamura K, Lipenkov V, Miller H, Mulvaney R, Parrenin F, Pattyn F, Ritz C, Schwander J, Steinhage D, van Ommen T, Wilhelms F, |
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Title |
Where to find 1.5 million yr old ice for the IPICS “Oldest-Ice” ice core
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Type |
Journal Article |
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Year |
2013 |
Publication |
Climate of the Past |
Abbreviated Journal |
1814-9324 |
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Volume |
9 |
Issue |
6 |
Pages |
2489-2505 |
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Abstract |
The recovery of a 1.5 million yr long ice core from Antarctica represents a keystone of our understanding of Quaternary climate, the progression of glaciation over this time period and the role of greenhouse gas cycles in this progression. Here we tackle the question of where such ice may still be found in the Antarctic ice sheet. We can show that such old ice is most likely to exist in the plateau area of the East Antarctic ice sheet (EAIS) without stratigraphic disturbance and should be able to be recovered after careful pre-site selection studies. Based on a simple ice and heat flow model and glaciological observations, we conclude that positions in the vicinity of major domes and saddle position on the East Antarctic Plateau will most likely have such old ice in store and represent the best study areas for dedicated reconnaissance studies in the near future. In contrast to previous ice core drill site selections, however, we strongly suggest significantly reduced ice thickness to avoid bottom melting. For example for the geothermal heat flux and accumulation conditions at Dome C, an ice thickness lower than but close to about 2500 m would be required to find 1.5 Myr old ice (i.e., more than 700 m less than at the current EPICA Dome C drill site). Within this constraint, the resolution of an Oldest-Ice record and the distance of such old ice to the bedrock should be maximized to avoid ice flow disturbances for example, by finding locations with minimum geothermal heat flux. As the geothermal heat flux is largely unknown for the EAIS, this parameter has to be carefully determined beforehand. In addition, detailed bedrock topography and ice flow history has to be reconstructed for candidates of an Oldest-Ice ice coring site. Finally, we argue strongly for rapid access drilling before any full, deep ice coring activity commences to bring datable samples to the surface and to allow an age check of the oldest ice. |
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902 |
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Copernicus GmbH |
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1814-9324 |
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yes |
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Call Number |
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Serial |
5727 |
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Title |
Phase relationships between orbital forcing and the composition of air trapped in Antarctic ice cores
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Journal Article |
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Year |
2015 |
Publication |
Climate of the Past Discussions |
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Volume |
11 |
Issue |
2 |
Pages |
1437-1477 |
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902 |
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Copernicus GmbH |
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1814-9359 |
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yes |
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Serial |
6199 |
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Author |
Lucie Bazin |
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2015 |
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902 |
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yes |
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Call Number |
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Serial |
6200 |
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Author |
Ritz Catherine, Hugh Corr, Fred Parrenin, Duncan Young, Jason Roberts, Olivier Passalacqua, Rob Mulvaney, Massimo Frezzotti, Luca Vittuari and others from the DC survey group |
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Title |
Oldest Ice reconnaissance in the vicinity of Concordia. Plans for a collaborative data-modelling approach |
Type |
Conference - International - Communication |
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Year |
2016 |
Publication |
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Abbreviated Journal |
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Abstract |
Recovering a 1.5 million years record of climate and greenhouse gases from Antarctica is a major objective of the ice core community and there is an agreement that such "Oldest Ice" could be found in the plateau area of the East Antarctic Ice Sheet. The region around the permanent station of Concordia (East Antarctica) is among the few possible spots. In the framework of IPICS, it was decided to have a consortium to work on the reconnaissance for Oldest Ice in the region of Dome C. We present here the field measurements that are planned or already going on and how we plan to associate heterogenous observations and ice flow/thermal modelling to infer optimal location. The key issue for retrieving very old ice in central regions is to avoid zones with basal melting at the ice bed interface because this process removes basal layers. Modelling approach is a tool to make predictions about the thermal type of ice-bed interface as well as chronology of the deep layers, however it is limited by the badly known geothermal heat flux value and this approach has to be combined with field observations. The measurements we are considering are radar measurements (airborne, ground based, and pRES), relatively shallow drillings to measure temperature vertical profile and strain net survey. |
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Programme |
902 |
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yes |
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Call Number |
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Serial |
6503 |
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Author |
Lucie Bazin, Amaelle Landais, Emilie Capron, Valérie Masson-Delmotte, Catherine Ritz, Ghislain Picard, Jean Jouzel, Marie Dumont, Markus Leuenberger, and Frédéric Prié |
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Title |
Phase relationships between orbital forcing and the composition of air trapped in Antarctic ice cores |
Type |
Journal Article |
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Year |
2016 |
Publication |
Climate of the past |
Abbreviated Journal |
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Volume |
12 |
Issue |
3 |
Pages |
729-748 |
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Abstract. Orbital tuning is central for ice core chronologies beyond annual layer counting, available back to 60 ka (i.e. thousands of years before 1950) for Greenland ice cores. While several complementary orbital tuning tools have recently been developed using δ18Oatm, δO2⁄N2 and air content with different orbital targets, quantifying their uncertainties remains a challenge. Indeed, the exact processes linking variations of these parameters, measured in the air trapped in ice, to their orbital targets are not yet fully understood. Here, we provide new series of δO2∕N2 and δ18Oatm data encompassing Marine Isotopic Stage (MIS) 5 (between 100 and 160 ka) and the oldest part (340–800 ka) of the East Antarctic EPICA Dome C (EDC) ice core. For the first time, the measurements over MIS 5 allow an inter-comparison of δO2∕N2 and δ18Oatm records from three East Antarctic ice core sites (EDC, Vostok and Dome F). This comparison highlights some site-specific δO2∕N2 variations. Such an observation, the evidence of a 100 ka periodicity in the δO2∕N2 signal and the difficulty to identify extrema and mid-slopes in δO2∕N2 increase the uncertainty associated with the use of δO2∕N2 as an orbital tuning tool, now calculated to be 3–4 ka. When combining records of δ18Oatm and δO2∕N2 from Vostok and EDC, we find a loss of orbital signature for these two parameters during periods of minimum eccentricity (∼ 400 ka, ∼ 720–800 ka). Our data set reveals a time-varying offset between δO2∕N2 and δ18Oatm records over the last 800 ka that we interpret as variations in the lagged response of δ18Oatm to precession. The largest offsets are identified during Terminations II, MIS 8 and MIS 16, corresponding to periods of destabilization of the Northern polar ice sheets. We therefore suggest that the occurrence of Heinrich–like events influences the response of δ18Oatm to precession. |
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902 |
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1814-9324 |
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yes |
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Serial |
6525 |
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Author |
Passalacqua, O., Gagliardini, O., Parrenin, F., Todd, J., Gillet-Chaulet, F., and Ritz, C |
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Title |
Performance and applicability of a 2.5-D ice-flow model in the vicinity of a dome |
Type |
Journal Article |
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Year |
2016 |
Publication |
Geosci. model dev. |
Abbreviated Journal |
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Volume |
9 |
Issue |
7 |
Pages |
2301-2313 |
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Abstract |
In ice-flow modelling, computing in 3-D requires a lot of resources, but 2-D models lack physical likelihood when the flow is diverging. That is why 2-D models accounting for the divergence, so-called 2.5-D models, are an interesting trade-off. However, the applicability of these 2.5-D models has never been systematically examined. We show that these models are ineffective in the case of highly diverging flows, but also for varying temperature, which was not suspected. |
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Programme |
902 |
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Bachelor's thesis |
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1991-9603 |
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yes |
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Serial |
6527 |
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Author |
Young, D. A., Roberts, J. L., Ritz, C., Frezzotti, M., Quartini, E., Cavitte, M. G. P., Tozer, C. R., Steinhage, D., Urbini, S., Corr, H. F. J., Van Ommen, T., and Blankenship, D. D. |
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Title |
High resolution boundary conditions of an old ice target near Dome C, Antarctica, |
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Journal Article |
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Year |
2016 |
Publication |
The cryosphere discuss. |
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2016 |
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1-16 |
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Abstract. A high resolution (1 km line spacing) aerogeophysical survey was conducted over a region near the East Antarctic Ice Sheet's Dome C that may hold a 1.5 million year old climate record. New ice thickness data derived from an airborne coherent radar sounder was combined with unpublished data that was unavailable for earlier compilations. We find under the primary candidate region elevated rough topography, near a number of subglacial lakes, but also regions of smoother bed. The high resolution of this ice thickness dataset also allows us to explore the nature of ice thickness uncertainties in the context of radar geometry and processing. |
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902 |
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1994-0440 |
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yes |
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6528 |
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Title |
Antarctic surface temperature and elevation during the Last Glacial Maximum |
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Year |
2021 |
Publication |
Science |
Abbreviated Journal |
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Volume |
372 |
Issue |
6546 |
Pages |
1097-1101 |
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902 |
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yes |
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8254 |
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