| Records |
Author  |
Zimmer I., Plötz J., Borneman H, Ancel A. & Hagen W |
| Title |
Foraging ecology of emperor penguins. |
Type |
Conference - International - Poster |
| Year |
2006 |
Publication |
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Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
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| Keywords |
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| Abstract |
AWI-Polar Systems meeting |
| Programme |
137 |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
5107 |
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| Author |
Zimmer I, Wilson RP, Beaulieu M, Ropert-Coudert Y, Kato A, Ancel A, Plötz J, |
| Title |
Dive efficiency versus depth in foraging emperor penguins
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Type |
Journal Article |
| Year |
2010 |
Publication |
Aquat Biol |
Abbreviated Journal |
Aquat Biol |
| Volume |
8 |
Issue |
3 |
Pages |
269-277 |
| Keywords |
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| Abstract |
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| Programme |
137 |
| Campaign |
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Edition |
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| ISSN |
1864-7790 |
ISBN |
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Medium |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
3124 |
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| Author |
Zigone, d.; Danecek, p.; Bès de berc, m.; Maggi, a.; Thore, j. y.; Leveque, j. j.; Vallee, m.; Bernard, a.; Sayadi, j.; Morelli, a.; Delladio, a.; Chappellaz, j. a.; Alemany, o.; Possenti, p.; Stutzmann, e.; Bonaime, s.; Pesqueira, f.; Pardo, c.; Vincent, d. |
| Title |
Evolution of the Concordia seismological observatory station CCD (GEOSCOPE network): a new post-hole installation on Antarctica inlandsis |
Type |
Communication |
| Year |
2017 |
Publication |
American geophysical union, fall meeting 2017, abstract #s11c-0607 |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
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| Keywords |
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| Abstract |
Concordia (75°S 123°E) is a scientific base operated by French polar institute IPEV (Institut Paul-Emile Victor) and Italian Antarctic Program PNRA (Programma Nazionale di Ricerche in Antartide), and is located at Dome C, on the ice sheet of the East Antarctica plateau. It hosts a seismological observatory (CCD), which is jointly operated by EOST (Strasbourg) and INGV (Roma). The highly strategic location and remoteness is the key strength of our program, which has provided observatory quality data since 2000. The station has been integrated into the GEOSCOPE network in 2008 and the data are now available in real time through GEOSCOPE and IRIS. The observatory is located at distance of 1km from the base. The current installation is placed at a depth of 12m in an artificial vault constructed from two shipping containers and buried in the snow. The vault is thermally very stable, but the relatively close proximity to the base causes increased diurnal noise ( 40 dB) at frequencies above 1Hz, especially during the summer season. The uppermost 100 m thick firn (snow) layer forms a waveguide, where anthropic noise from the base is trapped and easily picked up by the seismometers (T240 and STS2). Another limitation comes from the hydrostatic pressure of the snow which is continuously deforming the metallic structures: we record container cracking events on the seismograms, and we see visual evidence of structural deformations inside the tunnel and the vault. We propose an evolution of the CCD station towards a post-hole installation. Placing a sensor at a depth of approximately 130 meters, will reduce noise from thermal effects, from tilting and from anthropogenic activity, because it would be located below the firn layer waveguide and the ice pinch-out depth. In order to operate the borehole station for several years, we intend to keep the hole open and the sensor accessible, while ensuring good coupling between the sensor and the surrounding hard ice. To achieve these goals and to avoid any hydrostatic movement, we shall install a PEHD casing in the upper section of the borehole located in the firn layer. After installing the instrument in the hard ice, we shall then fill the hole with silicone oil whose density is similar to that of ice. The drilling is scheduled to start in January 2018. Updates on the project will be presented at the meeting. |
| Programme |
133 |
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Medium |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
7322 |
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| Author |
Ziad, E. Aristidi, A. Agabi, J. Borgnino, F. Martin, E. Fossat |
| Title |
First statistics of turbulence outer scale at Dome C |
Type |
Journal Article |
| Year |
2008 |
Publication |
Astronomy & astrophysics |
Abbreviated Journal |
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| Volume |
491 |
Issue |
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Pages |
917-921 |
| Keywords |
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| Abstract |
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| Programme |
908 |
| Campaign |
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Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0004-6361 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
5196 |
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| Author |
Zhuang Jiang, Becky Alexander, Joel Savarino, Joseph Erbland, Lei Geng |
| Title |
Impacts of the photo-driven post-depositional processing on snow nitrate and its isotopes at Summit, Greenland: a model-based study |
Type |
Journal |
| Year |
2021 |
Publication |
The Cryosphere |
Abbreviated Journal |
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| Volume |
15 |
Issue |
9 |
Pages |
4207-4220 |
| Keywords |
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| Abstract |
Abstract. Atmospheric Information Embedded In Ice-core Nitrate Is Disturbed By Post-depositional Processing. Here We Used A Layered Snow Photochemical Column Model To Explicitly Investigate The Effects Of Post-depositional Processing On Snow Nitrate And Its Isotopes (δ15n And Δ17o) At Summit, Greenland, Where Post-depositional Processing Was Thought To Be Minimal Due To The High Snow Accumulation Rate. We Found Significant Redistribution Of Nitrate In The Upper Snowpack Through Photolysis, And Up To 21 % Of Nitrate Was Lost And/or Redistributed After Deposition. The Model Indicates Post-depositional Processing Can Reproduce Much Of The Observed δ15n Seasonality, While Seasonal Variations In δ15n Of Primary Nitrate Are Needed To Reconcile The Timing Of The Lowest Seasonal δ15n. In Contrast, Post-depositional Processing Can Only Induce Less Than 2.1 ‰ Seasonal Δ17o Change, Much Smaller Than The Observation (9 ‰) That Is Ultimately Determined By Seasonal Differences In Nitrate Formation Pathway. Despite Significant Redistribution Of Snow Nitrate In The Photic Zone And The Associated Effects On δ15n Seasonality, The Net Annual Effect Of Post-depositional Processing Is Relatively Small, Suggesting Preservation Of Atmospheric Signals At The Annual Scale Under The Present Summit Conditions. But At Longer Timescales When Large Changes In Snow Accumulation Rate Occur This Post-depositional Processing Could Become A Major Driver Of The δ15n Variability In Ice-core Nitrate. |
| Programme |
1177 |
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Edition |
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| ISSN |
1994-0416 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8375 |
| Permanent link to this record |
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| Author |
Zhu L. & Rivera L. |
| Title |
Computation of dynamic and static displacement from a point source in multilayered media. |
Type |
Journal Article |
| Year |
2002 |
Publication |
Geophysical journal international |
Abbreviated Journal |
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| Volume |
148 |
Issue |
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Pages |
619-627 |
| Keywords |
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| Abstract |
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| Programme |
133 |
| Campaign |
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Place of Publication |
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Original Title |
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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 |
0956-540X |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
1795 |
| Permanent link to this record |
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| Author |
Zhou X. |
| Title |
Ile de l'Est (Crozet Archipelago, Southwestern Indian Ocean): Petrogenesis of the plutonic complexes. |
Type |
Thesis |
| Year |
1996 |
Publication |
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Abbreviated Journal |
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Issue |
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Pages |
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| Keywords |
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| Abstract |
Thèse présentée pour l'obtention du grade légal de Docteur en Sciences, Université Libre de Bruxelles |
| Programme |
251 |
| Campaign |
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Edition |
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ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
620 |
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| Author |
Zhiyong Xie, Zhen Wang, Olivier Magand, Alban Thollot, Ralf Ebinghaus, Wenying Mi, Aurelien Dommergue |
| Title |
Occurrence of legacy and emerging organic contaminants in snow at Dome C in the Antarctic |
Type |
Journal |
| Year |
2020 |
Publication |
Science of The Total Environment |
Abbreviated Journal |
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| Volume |
741 |
Issue |
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Pages |
140200 |
| Keywords |
Antarctic Organophosphate esters PAH PFAS Snow |
| Abstract |
Concentrations of 9 organophosphate esters (OPEs), 16 perfluoroalkylated substances (PFASs) and 17 polycyclic aromatic hydrocarbons (PAHs) were investigated in surface snow samples collected at Dome C on the Antarctic Plateau in summer 2016. Tris(1-chloro-2-propyl) phosphate (TCPP), tris-(2-chloroethyl) phosphate (TCEP) and tri-n-butylphosphate (TnBP) were the dominant compounds of OPEs, with mean concentrations of 8157 ± 4860, 1128 ± 928 and 1232 ± 1147 pg/L. Perfluorooctanoic acid (PFOA, mean: 358 ± 71 pg/L) was the dominant compound of PFASs, and following by perfluoro-n-hexanoic acid (PFHxA, mean: 222 ± 97 pg/L), perfluoro-n-heptanoic acid (PFHpA, 183 ± 60 pg/L) and perfluoro-n-pentanoic acid (PFPeA, 175 ± 105 pg/L). 2-(Heptafluoropropoxy)propanoic acid (HFPO-DA, mean: 9.2 ± 2.6 pg/L) was determined in the Antarctic for the first time. Significantly positive correlations were observed between HFPO-DA and the short-chain PFASs, implying they have similar emission sources and long-range transport potential. High levels of 2-methylnaphthalene and 1-methylnaphthalene, as well as the ratios of PAH congeners indicated PAHs were attributable mostly to combustion origin. Occurrence and profiles of the indicators of OPEs, PFASs and PAHs, as well as air mass back-trajectory analysis provided direct evidences of human activities on Concordia station and posed obvious impacts on local environments in the Antarctic. Nevertheless, the exchange processes among different environmental matrices may drive the long-range transport and redistribution of the legacy and emerging Organic contaminants from coast to inland in the Antarctic. |
| Programme |
1028 |
| Campaign |
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| Address |
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Thesis |
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| Publisher |
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Place of Publication |
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Editor |
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| Language |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0048-9697 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
7685 |
| Permanent link to this record |
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| Author |
Zhitu Ma, Colleen A. Dalton |
| Title |
Evolution of the lithosphere in the Indian Ocean from combined earthquake and ambient noise tomography |
Type |
Journal |
| Year |
2017 |
Publication |
Journal of Geophysical Research: Solid Earth |
Abbreviated Journal |
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| Volume |
122 |
Issue |
1 |
Pages |
354-371 |
| Keywords |
ambient noise Indian Ocean surface wave |
| Abstract |
Abstract Rayleigh wave dispersion extracted from ambient seismic noise has been widely used to image crustal and uppermost mantle structure. Applications of this approach in continental settings are abundant, but there have been relatively few studies within ocean basins. By cross-correlating ambient noise recorded at broadband seismic stations around the Indian Ocean, we demonstrate the feasibility of extracting high-quality, long-period (10?30 mHz) Rayleigh waves that traverse the entire ocean basin. High-quality Rayleigh wave cross-correlation functions can be obtained from stacking waveforms over less than 2 years at land stations and less than 4 years at island stations. We show that adding the dispersion information extracted from ambient noise to a global earthquake data set can improve the resolution of phase velocity maps by about 20% in the northern Indian Ocean, where the station distribution is the best. We find that a plate cooling model with a potential temperature of 1450°C and plate thickness of 125 km can fit both the seismic observations and seafloor topography. The Seychelles-Mascarene Plateau is characterized by anomalously slow velocity at 30 mHz. The inclusion of ambient noise data in the tomographic inversion shifts the slow velocity anomaly into better agreement with the topographic relief, allowing us to estimate its crustal thickness and confirm that the plateau's elevation is supported by thick crust. The 10 and 20 mHz phase velocity maps show a strong asymmetry across the Central Indian Ridge that is best explained by eastward asthenospheric flow emanating from nearby hot spots. |
| Programme |
133 |
| Campaign |
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| Address |
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Place of Publication |
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Editor |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
2169-9313 |
ISBN |
2169-9313 |
Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
7326 |
| Permanent link to this record |
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| Author |
Zhendong Zhang, Jessica C. E. Irving, Frederik J. Simons, Tariq Alkhalifah |
| Title |
Seismic evidence for a 1000 km mantle discontinuity under the Pacific |
Type |
Journal |
| Year |
2023 |
Publication |
Nature Communications |
Abbreviated Journal |
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| Volume |
14 |
Issue |
1 |
Pages |
1714 |
| Keywords |
Geophysics Seismology |
| Abstract |
Seismic discontinuities in the mantle are indicators of its thermo-chemical state and offer clues to its dynamics. Ray-based seismic methods, though limited by the approximations made, have mapped mantle transition zone discontinuities in detail, but have yet to offer definitive conclusions on the presence and nature of mid-mantle discontinuities. Here, we show how to use a wave-equation-based imaging method, reverse-time migration of precursors to surface-reflected seismic body waves, to uncover both mantle transition zone and mid-mantle discontinuities, and interpret their physical nature. We observe a thinned mantle transition zone southeast of Hawaii, and a reduction in impedance contrast around 410 km depth in the same area, suggesting a hotter-than-average mantle in the region. Here, we furthermore reveal a 4000–5000 km-wide reflector in new images of the mid mantle below the central Pacific, at 950–1050 km depth. This deep discontinuity exhibits strong topography and generates reflections with polarity opposite to those originating at the 660 km discontinuity, implying an impedance reversal near 1000 km. We link this mid-mantle discontinuity to the upper reaches of deflected mantle plumes upwelling in the region. Reverse-time migration full-waveform imaging is a powerful approach to imaging Earth’s interior, capable of broadening our understanding of its structure and dynamics and shrinking modeling uncertainties. |
| Programme |
133 |
| Campaign |
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| Address |
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Thesis |
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Editor |
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Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
2041-1723 |
ISBN |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8549 |
| Permanent link to this record |
