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Author |
Barruol Guilhem, Cordier Emmanuel, Bascou Jérôme, Fontaine Fabrice R, Legrésy Benoit, Lescarmontier Lydie, |
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Title |
Tide-induced microseismicity in the Mertz glacier grounding area, East Antarctica
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Journal Article |
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Year |
2013 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
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Volume |
40 |
Issue |
20 |
Pages |
5412-5416 |
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133;1003 |
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Bachelor's thesis |
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1944-8007 |
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yes |
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4765 |
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Author |
Bai L, Ritsema J, |
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Title |
The effect of large-scale shear-velocity heterogeneity on SS precursor amplitudes
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Type |
Journal Article |
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Year |
2013 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
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Volume |
40 |
Issue |
23 |
Pages |
6054-6058 |
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Keywords |
mantle transition zone, SS precursors, velocity heterogeneity, amplitude, 1734 Seismology, 7290 Computational seismology, 8124 Earth's interior: composition and state, |
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133 |
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1944-8007 |
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yes |
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Serial |
4766 |
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Author |
Bekki S, Rap A, Poulain V, Dhomse S, Marchand M, Lefevre F, Forster PM, Szopa S, Chipperfield MP, |
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Title |
Climate impact of stratospheric ozone recovery
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Type |
Journal Article |
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Year |
2013 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
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Volume |
40 |
Issue |
11 |
Pages |
2796-2800 |
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Keywords |
stratospheric ozone, climate, 0340 Middle atmosphere: composition and chemistry, |
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Programme |
209 |
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1944-8007 |
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yes |
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4874 |
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Author |
Vallée Martin, Satriano Claudio, |
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Title |
Ten year recurrence time between two major earthquakes affecting the same fault segment
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Type |
Journal Article |
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Year |
2014 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
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Volume |
41 |
Issue |
7 |
Pages |
2312-2318 |
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Keywords |
earthquake recurrence, rerupture, seismic gap hypothesis, dynamic stress, Scotia, 7215 Earthquake source observations, 7223 Earthquake interaction, forecasting, and prediction, 7203 Body waves, 7209 Earthquake dynamics, 7250 Transform faults, |
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Abstract |
Earthquake ruptures stop when they encounter barriers impeding further propagation. These barriers can theoretically originate from changes of geometry or nature of the seismic faults or from a strong lowering of the tectonic stresses, typically due to the occurrence of a recent major earthquake. We show here that this latter mechanism can be ineffective at stopping rupture expansion: the 17 November 2013 magnitude 7.8 Scotia Sea earthquake has propagated into a 100 km long zone already ruptured 10 years ago by a magnitude 7.6 earthquake. Given the plate velocities between Scotia and Antarctic plates (8–9 mm/yr), simple recurrence models would have predicted that the segment affected by the 2003 earthquake could not be reruptured by a major earthquake during several hundreds of years. This earthquake pair indicates that the variations of the tectonic stress during the seismic history of the fault are small compared to the stresses dynamically generated by a large earthquake. |
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133 |
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1944-8007 |
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yes |
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Serial |
5025 |
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Author |
Lynner Colton, Long Maureen D, |
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Title |
Lowermost mantle anisotropy and deformation along the boundary of the African LLSVP
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Type |
Journal Article |
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Year |
2014 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
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Volume |
41 |
Issue |
10 |
Pages |
3447-3454 |
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Keywords |
lowermost mantle anisotropy, African LLSVP, discrepant SKS-SKKS splitting, 7208 Mantle, 7203 Body waves, |
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Abstract |
Shear wave splitting of SK(K)S phases is often used to examine upper mantle anisotropy. In specific cases, however, splitting of these phases may reflect anisotropy in the lowermost mantle. Here we present SKS and SKKS splitting measurements for 233 event-station pairs at 34 seismic stations that sample D″ beneath Africa. Of these, 36 pairs show significantly different splitting between the two phases, which likely reflects a contribution from lowermost mantle anisotropy. The vast majority of discrepant pairs sample the boundary of the African large low shear velocity province (LLSVP), which dominates the lower mantle structure beneath this region. In general, we observe little or no splitting of phases that have passed through the LLSVP itself and significant splitting for phases that have sampled the boundary of the LLSVP. We infer that the D″ region just outside the LLSVP boundary is strongly deformed, while its interior remains undeformed (or weakly deformed). |
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Programme |
133 |
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1944-8007 |
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yes |
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Call Number |
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Serial |
5026 |
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Author |
Sarah Safieddine, Marie Bouillon, Ana-Claudia Paracho, Julien Jumelet, Florent Tencé, Andrea Pazmino, Florence Goutail, Catherine Wespes, Slimane Bekki, Anne Boynard, Juliette Hadji‐Lazaro, Pierre-François Coheur, Daniel Hurtmans, Cathy Clerbaux |
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Title |
Antarctic Ozone Enhancement During the 2019 Sudden Stratospheric Warming Event |
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Journal |
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Year |
2020 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
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Volume |
47 |
Issue |
14 |
Pages |
e2020GL087810 |
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Keywords |
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Abstract |
We analyze the 2019 sudden stratospheric warming event that occurred in the Southern Hemisphere through its impact on the Antarctic ozone. Using temperature, ozone, and nitric acid data from the Infrared Atmospheric Sounding Interferometer (IASI), our results show that the average increase in stratospheric temperature reached a maximum of 34.4° on 20 September in the [60–90]°S latitude range when compared to the past 3 years. Dynamical parameters suggest a locally reversed and weakened zonal winds and a shift in the location of the polar jet vortex. This led to air masses mixing, to a reduced polar stratospheric clouds formation detected at a ground station, and as such to lower ozone and nitric acid depletion. 2019 total ozone columns for the months of September, October, and November were on average higher by 29%, 28%, and 26%, respectively, when compared to the 11-year average of the same months. |
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Programme |
209 |
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ISSN |
1944-8007 |
ISBN |
1944-8007 |
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yes |
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Call Number |
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Serial |
6954 |
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Author |
Guy Wöppelmann, Marta Marcos, Alvaro Santamaría‐Gómez, Belén Martín‐Míguez, Marie-Noëlle Bouin, Médéric Gravelle |
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Title |
Evidence for a differential sea level rise between hemispheres over the twentieth century |
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Journal |
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Year |
2014 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
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Volume |
41 |
Issue |
5 |
Pages |
1639-1643 |
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Keywords |
climate change geodesy GPS land motion sea level tide gauge |
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Abstract |
AbstractTide gauge records are the primary source of sea level information over multidecadal to century timescales. A critical issue in using this type of data to determine global climate-related contributions to sea level change concerns the vertical motion of the land upon which the gauges are grounded. Here we use observations from the Global Positioning System for the correction of this vertical land motion. As a result, the spatial coherence in the rates of sea level change during the twentieth century is highlighted at the local and the regional scales, ultimately revealing a clearly distinct behavior between the Northern and the Southern Hemispheres with values of 2.0 mm/yr and 1.1 mm/yr, respectively. Our findings challenge the widely accepted value of global sea level rise for the twentieth century. |
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Programme |
688 |
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ISSN |
1944-8007 |
ISBN |
1944-8007 |
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yes |
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Call Number |
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Serial |
7080 |
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Author |
E. Pauthenet, F. Roquet, G. Madec, C. Guinet, M. Hindell, C. R. McMahon, R. Harcourt, D. Nerini |
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Title |
Seasonal Meandering of the Polar Front Upstream of the Kerguelen Plateau |
Type |
Journal |
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Year |
2018 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
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Volume |
45 |
Issue |
18 |
Pages |
9774-9781 |
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Keywords |
Antarctic Polar Front functional principal component analysis Kerguelen Plateau Southern Indian Ocean Southern Ocean fronts |
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Abstract |
The location of the Antarctic Polar Front (PF) is mapped in the Southern Indian Ocean by decomposing the shape of temperature and salinity profiles into vertical modes using a functional Principal Component Analysis. We define the PF as the northernmost minimum of temperature at the subsurface and represent it as a linear combination of the first three modes. This method is applied on an ocean reanalysis data set and on in situ observations, revealing a seasonal variability of the PF latitudinal position that is most pronounced between the Conrad Rise and the Kerguelen Plateau. This shift coincides with variations in the transport across the Northern Kerguelen Plateau. We suggest that seasonal changes of the upper stratification may drive the observed variability of the PF, with potentially large implications for the pathways and residence time of water masses over the plateau and the phytoplankton bloom extending southeast of the Kerguelen Islands. |
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Programme |
1201 |
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1944-8007 |
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1944-8007 |
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yes |
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Serial |
7369 |
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Author |
É Vignon, M.-L. Roussel, I. V. Gorodetskaya, C. Genthon, A. Berne |
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Title |
Present and Future of Rainfall in Antarctica |
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Journal |
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Year |
2021 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
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Volume |
48 |
Issue |
8 |
Pages |
e2020GL092281 |
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Keywords |
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Abstract |
While most precipitation in Antarctica falls as snow, little is known about liquid precipitation, although it can have ecological and climatic impacts. This study combines meteorological reports at 10 stations with the ERA5 reanalysis to provide a climatological characterization of rainfall occurrence over Antarctica. Along the East Antarctic coast, liquid precipitation occurs 22 days per year at most and coincides with maritime intrusions and blocking anticyclones. Over the north-western Antarctic Peninsula, rainfall occurs more than 50 days per year on average and the recent summer cooling was accompanied by a decrease of −35 annual rainy days per decade between 1998 and 2015 at Faraday-Vernadsky. Projections from seven latest-generation climate models reveal that Antarctic coasts will experience a warming and more frequent and intense rainfall by the end of the century. Rainfall is expected to impact new regions of the continent, increasing their vulnerability to melting by the preconditioning of surface snow. |
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Programme |
1013,1143 |
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Thesis |
Bachelor's thesis |
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1944-8007 |
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yes |
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Serial |
7935 |
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Author |
Sara Labrousse, Alexander D. Fraser, Michael Sumner, Takeshi Tamura, David Pinaud, Barbara Wienecke, Roger Kirkwood, Yan Ropert‐Coudert, Ryan Reisinger, Ian Jonsen, Rick Porter‐Smith, Christophe Barbraud, Charles-André Bost, Rubao Ji, Stéphanie Jenouvrier |
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Title |
Dynamic Fine-Scale Sea Icescape Shapes Adult Emperor Penguin Foraging Habitat in East Antarctica |
Type |
Journal |
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Year |
2019 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
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Volume |
46 |
Issue |
20 |
Pages |
11206-11218 |
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Keywords |
emperor penguin fast ice foraging ecology iceberg polynya sea ice |
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Abstract |
The emperor penguin, an iconic species threatened by projected sea ice loss in Antarctica, has long been considered to forage at the fast ice edge, presumably relying on large/yearly persistent polynyas as their main foraging habitat during the breeding season. Using newly developed fine-scale sea icescape data and historical penguin tracking data, this study for the first time suggests the importance of less recognized small openings, including cracks, flaw leads and ephemeral short-term polynyas, as foraging habitats for emperor penguins. The tracking data retrieved from 47 emperor penguins in two different colonies in East Antarctica suggest that those penguins spent 23% of their time in ephemeral polynyas and did not use the large/yearly persistent, well-studied polynyas, even if they occur much more regularly with predictable locations. These findings challenge our previous understanding of emperor penguin breeding habitats, highlighting the need for incorporating fine-scale seascape features when assessing the population persistence in a rapidly changing polar environment. |
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Programme |
109,394,1091 |
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Bachelor's thesis |
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1944-8007 |
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yes |
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Call Number |
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Serial |
7636 |
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