| Records |
| Author |
G. Picard, H. Löwe, F. Domine, L. Arnaud, F. Larue, V. Favier, E. Le Meur, E. Lefebvre, J. Savarino, A. Royer |
| Title |
The Microwave Snow Grain Size: A New Concept to Predict Satellite Observations Over Snow-Covered Regions |
Type |
Journal |
| Year |
2022 |
Publication |
AGU Advances |
Abbreviated Journal |
|
| Volume |
3 |
Issue |
4 |
Pages |
e2021AV000630 |
| Keywords |
microstructure microwave modeling porous media remote sensing snow |
| Abstract |
Satellite observations of snow-covered regions in the microwave range have the potential to retrieve essential climate variables such as snow height. This requires a precise understanding of how microwave scattering is linked to snow microstructural properties (density, grain size, grain shape and arrangement). This link has so far relied on empirical adjustments of the theories, precluding the development of robust retrieval algorithms. Here we solve this problem by introducing a new microstructural parameter able to consistently predict scattering. This “microwave grain size” is demonstrated to be proportional to the measurable optical grain size and to a new factor describing the chord length dispersion in the microstructure, a geometrical property known as polydispersity. By assuming that the polydispersity depends on the snow grain type only, we retrieve its value for rounded and faceted grains by optimization of microwave satellite observations in 18 Antarctic sites, and for depth hoar in 86 Canadian sites using ground-based observations. The value for the convex grains (0.6) compares favorably to the polydispersity calculated from 3D micro-computed tomography images for alpine grains, while values for depth hoar show wider variations (1.2–1.9) and are larger in Canada than in the Alps. Nevertheless, using one value for each grain type, the microwave observations in Antarctica and in Canada can be simulated from in-situ measurements with good accuracy with a fully physical model. These findings improve snow scattering modeling, enabling future more accurate uses of satellite observations in snow hydrological and meteorological applications. |
| Programme |
1110,1177 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
Bachelor's thesis |
| 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  |
2576-604X |
ISBN |
|
Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
8424 |
| Permanent link to this record |
| |
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| |
| Author |
Amro Hashish, Timothy J. Johnson, Dhiraj Chundru, Michele L. Williams, Yuko Sato, Nubia R. Macedo, Augustin Clessin, Hubert Gantelet, Caroline Bost, Jérémy Tornos, Amandine Gamble, Karen J. LeCount, Mostafa Ghanem, Thierry Boulinier, Mohamed El-Gazzar |
| Title |
Complete Genome Sequences of Two Pasteurella multocida Isolates from Seabirds |
Type |
Journal |
| Year |
2023 |
Publication |
Microbiology Resource Announcements |
Abbreviated Journal |
|
| Volume |
12 |
Issue |
4 |
Pages |
e01365-22 |
| Keywords |
|
| Abstract |
Pasteurella multocida is one of the major causes of mass mortalities in wild birds. Here, we report the complete genome sequences of two P. multocida isolates from wild populations of two endangered seabird species, the Indian yellow-nosed albatrosses (Thalassarche carteri) and the northern rockhopper penguins (Eudyptes moseleyi). |
| Programme |
1151 |
| Campaign |
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| Address |
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| Corporate Author |
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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 |
2576-098X |
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 |
8623 |
| Permanent link to this record |
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| |
| Author |
J-C Gallet, P. Björkman, CP Borstad, AJ Hodson, H-W Jacobi, C Larose, B Luks, A Spolaor, TV Schuler, A Urazgildeeva, C Zdanowicz |
| Title |
Snow research in Svalbard: Current status and knowledge gaps |
Type |
Report |
| Year |
2019 |
Publication |
E. orr, g. hansen, h. lappalainen, c. hübner, and h. lihavainen (eds.), SESS report 2018, the state of environmental science in svalbard – an annual report |
Abbreviated Journal |
|
| Volume |
|
Issue |
|
Pages |
82-107 |
| Keywords |
snow, climate, cryosphere, glaciology, ecology, sea-ice |
| Abstract |
|
| Programme |
1126 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
Bachelor's thesis |
| Publisher |
|
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 |
|
Series Title |
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Abbreviated Series Title |
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| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
2535-6321 |
ISBN |
978-82-691528-0-7 |
Medium |
|
| Area |
|
Expedition |
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Conference |
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| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
7544 |
| Permanent link to this record |
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| |
| Author |
Philippe Ricaud, Patrice Medina, Pierre Durand, Jean-Luc Attié, Eric Bazile, Paolo Grigioni, Massimo Del Guasta, Benji Pauly |
| Title |
In Situ VTOL Drone-Borne Observations of Temperature and Relative Humidity over Dome C, Antarctica |
Type |
Journal |
| Year |
2023 |
Publication |
Drones |
Abbreviated Journal |
|
| Volume |
7 |
Issue |
8 |
Pages |
532 |
| Keywords |
Antarctica Concordia station drone free troposphere planetary boundary layer relative humidity temperature VTOL |
| Abstract |
The Antarctic atmosphere is rapidly changing, but there are few observations available in the interior of the continent to quantify this change due to few ground stations and satellite measurements. The Concordia station is located on the East Antarctic Plateau (75° S, 123° E, 3233 m above mean sea level), one of the driest and coldest places on Earth. Several remote sensing instruments are available at the station to probe the atmosphere, together with operational meteorological sensors. In order to observe in situ clouds, temperature, relative humidity and supercooled liquid water (SLW) at a high vertical resolution, a new project based on the use of an unmanned aerial vehicle (drone) vertical take-off and landing from the DeltaQuad Company has been set up at Concordia. A standard Vaisala pressure, temperature and relative humidity sensor was installed aboard the drone coupled to an Anasphere SLW sensor. A total of thirteen flights were conducted from 24 December 2022 to 17 January 2023: nine technology flights and four science flights (on 2, 10, 11 and 13 January 2023). Drone-based temperature and relative humidity profiles were compared to (1) the balloon-borne meteorological observations at 12:00 UTC, (2) the ground-based microwave radiometer HAMSTRAD and (3) the outputs from the numerical weather prediction models ARPEGE and AROME. No SLW clouds were present during the period of observations. Despite technical issues with drone operation due to the harsh environments encountered (altitude, temperature and geomagnetic field), the drone-based observations were consistent with the balloon-borne observations of temperature and relative humidity. The radiometer showed a systematic negative bias in temperature of 2 °C, and the two models were, in the lowermost troposphere, systematically warmer (by 2–4 °C) and moister (by 10–30%) than the drone-based observations. Our study shows the great potential of a drone to probe the Antarctic atmosphere in situ at very high vertical resolution (a few meters). |
| Programme |
910 |
| Campaign |
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| Address |
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| Corporate Author |
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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 |
2504-446X |
ISBN |
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Medium |
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| Area |
|
Expedition |
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Conference |
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| Notes |
|
Approved |
yes |
| Call Number |
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Serial |
8781 |
| Permanent link to this record |
| |
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| |
| Author |
France Caza, Maximiliano Cledon, Yves St-Pierre |
| Title |
Biomonitoring Climate Change and Pollution in Marine Ecosystems: A Review on Aulacomya ater |
Type |
Journal |
| Year |
2016 |
Publication |
Journal of Marine Sciences |
Abbreviated Journal |
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| Volume |
|
Issue |
|
Pages |
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| Keywords |
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| Abstract |
The sedentarism and wide global distribution of the blue mussel Mytilus edulis have made it a useful bioindicator to assess changes in the health status of the marine ecosystem in response to pollution and other environmental stresses. Effective biomonitoring of an ecosystem requires, however, that multiple biomarkers be used to obtain an accurate measure of the cumulative effects of different sources of environmental stress. Here, we provide a first integrated review of the biological, economical, and geographical characteristics of another species of mussels, the ribbed mussel Aulacomya ater. We discuss the use of Aulacomya ater as a complementary biomonitor to the blue mussel to assess the impact of pollutants and climate change. Recent findings have indeed shown that Mytilus edulis and Aulacomya ater have distinctive anatomy and physiology and respond differently to environmental stress. Monitoring of mixed beds containing blue and ribbed mussels may thus represent a unique opportunity to study the effect of environmental stress on the biodiversity of marine ecosystems, most notably in the Southern hemisphere, which is particularly sensitive to climate change and where both species often cohabitate in the same intertidal zones. |
| Programme |
409 |
| Campaign |
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| Address |
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| Corporate Author |
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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 |
|
| ISSN |
2475-4706 |
ISBN |
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Medium |
|
| Area |
|
Expedition |
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Conference |
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| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
7609 |
| Permanent link to this record |
| |
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| |
| Author |
Sophia Ferchiou, France Caza, Richard Villemur, Jacques Labonne, Yves St-Pierre |
| Title |
Skin and Blood Microbial Signatures of Sedentary and Migratory Trout (Salmo trutta) of the Kerguelen Islands |
Type |
Journal |
| Year |
2023 |
Publication |
Fishes |
Abbreviated Journal |
|
| Volume |
8 |
Issue |
4 |
Pages |
174 |
| Keywords |
Salmo trutta 16S rRNA blood microbiome fish Kerguelen Islands migration skin microbiome |
| Abstract |
Our understanding of how microbiome signatures are modulated in wild fish populations remains poorly developed and has, until now, mostly been inferred from studies in commercial and farmed fish populations. Here, for the first time, we have studied changes in the skin and blood microbiomes of the Salmo trutta population of the volcanic Kerguelen archipelago located at the northern limit of the Antarctic Ocean. The Kerguelen Islands present a natural framework of population expansion and reveal a likely situation representing further climate change in distribution areas. Our results showed that S. trutta of the Kerguelen Islands has a microbiome signature distinct from those of salmonids of the Northern Hemisphere. Our study also revealed that the skin and blood microbiomes differ between sedentary and migratory S. trutta. While 18 phyla were shared between both groups of trout, independent of the compartment, 6 phyla were unique to migratory trout. Further analyses showed that microbiome signatures undergo significant site-specific variations that correlate, in some cases, with the peculiarity of specific ecosystems. Our study also revealed the presence of potential pathogens at particular sites and the impact of abiotic factors on the microbiome, most notably due to the volcanic nature of the environment. This study contributes to a better understanding of the factors that modulate the microbiome signatures of migratory and sedentary fish populations. It will also help to better monitor the impacts of climate change on the colonization process in the sub-Antarctic region. |
| Programme |
1041 |
| Campaign |
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| Address |
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| Corporate Author |
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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 |
2410-3888 |
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 |
|
Approved |
yes |
| Call Number |
|
Serial |
8404 |
| Permanent link to this record |
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| |
| Author |
Vincent Zvénigorosky, Sylvie Duchesne, Liubomira Romanova, Patrice Gérard, Christiane Petit, Michel Petit, Anatoly Alexeev, Olga Melnichuk, Angéla Gonzalez, Jean-Luc Fausser, Aisen Solovyev, Georgii Romanov, Nikolay Barashkov, Sardana Fedorova, Bertrand Ludes, Eric Crubézy, Christine Keyser |
| Title |
The genetic legacy of legendary and historical Siberian chieftains |
Type |
Journal |
| Year |
2020 |
Publication |
Communications Biology |
Abbreviated Journal |
|
| Volume |
3 |
Issue |
1 |
Pages |
1-9 |
| Keywords |
|
| Abstract |
Seventeen years of archaeological and anthropological expeditions in North-Eastern Siberia (in the Sakha Republic, Yakutia) have permitted the genetic analysis of 150 ancient (15th-19th century) and 510 modern individuals. Almost all males were successfully analysed (Y-STR) and this allowed us to identify paternal lineages and their geographical expansion through time. This genetic data was confronted with mythological, historical and material evidence to establish the sequence of events that built the modern Yakut genetic diversity. We show that the ancient Yakuts recovered from this large collection of graves are not representative of an ancient population. Uncommonly, we were also able to demonstrate that the funerary preference observed here involved three specific male lineages, especially in the 18th century. Moreover, this dominance was likely caused by the Russian conquest of Siberia which allowed some male clans to rise to new levels of power. Finally, we give indications that some mythical and historical figures might have been the actors of those genetic changes. These results help us reconsider the genetic dynamics of colonization in some regions, question the distinction between fact and myth in national histories and provide a rare insight into a funerary ensemble by revealing the biased process of its composition. |
| Programme |
1038 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
Bachelor's thesis |
| Publisher |
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Place of Publication |
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Editor |
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| Language |
|
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 |
2399-3642 |
ISBN |
2399-3642 |
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 |
7790 |
| Permanent link to this record |
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| Author |
A.-M. Lagrange, Nadège Meunier, Pascal Rubini, Miriam Keppler, Franck Galland, Eric Chapellier, Eric Michel, Luis Balona, Hervé Beust, Tristan Guillot, Antoine Grandjean, Simon Borgniet, Djamel Mékarnia, Paul Anthony Wilson, Flavien Kiefer, Mickael Bonnefoy, Jorge Lillo-Box, Blake Pantoja, Matias Jones, Daniela Paz Iglesias, Laetitia Rodet, Matias Diaz, Abner Zapata, Lyu Abe, François-Xavier Schmider |
| Title |
Evidence for an additional planet in the β Pictoris system |
Type |
Journal |
| Year |
2019 |
Publication |
Nature Astronomy |
Abbreviated Journal |
|
| Volume |
3 |
Issue |
12 |
Pages |
1135-1142 |
| Keywords |
|
| Abstract |
With its imaged debris disk of dust, its evaporating exocomets, and an imaged giant planet, the young (~23 Myr) β Pictoris system is a unique proxy for detailed studies of planet formation processes as well as planet–disk interactions. Here, we study ten years of European Southern Observatory/High Accuracy Radial Velocity Planet Searcher (HARPS) high-resolution spectroscopic data of β Pictoris. After removing the radial velocity (RV) signals arising from the δ Scuti pulsations of the star, a ~1,200-d periodic signal remains, which, within our current knowledge, we can only attribute to a second planet in the system. The β Pic c mass is about nine times the mass of Jupiter; it orbits at ~2.7 au on an eccentric (e ~ 0.24) orbit. More RV data are needed to obtain more precise estimates of the properties of β Pic c. The current modelling of the planet’s properties and the dynamic of the whole system has to be reinvestigated in light of this detection. |
| Programme |
1066 |
| Campaign |
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| Address |
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| Corporate Author |
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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 |
2397-3366 |
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 |
7702 |
| Permanent link to this record |
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| Author |
Bart Van de Vijver, Richard M. Crawford |
| Title |
Melosira jeanbertrandiana, a new Melosira species (Bacillariophyceae) from the sub-Antarctic region |
Type |
Journal |
| Year |
2019 |
Publication |
Botany Letters |
Abbreviated Journal |
|
| Volume |
167 |
Issue |
1 |
Pages |
50-56 |
| Keywords |
Melosira melosiroid genera morphology new species Sub-Antarctica |
| Abstract |
During a survey of the soil diatom flora of the sub-Antarctic Ile de la Possession (Iles Crozet), located in the southern Indian Ocean, an unknown Melosira species was found that could not be identified using the currently available literature on the genus. The species is described as Melosira jeanbertrandiana sp. nov. based on detailed light and scanning electron microscopy observations. The new species is characterized by a relatively high mantle, the presence of several marginal rings of acute, never bifurcating spines and a series of eight rimoportulae near the central area with several others scattered over the rest of the valve face and mantle. The girdle comprising several large, ligulate open copulae and the position of the rimoportulae clearly place this new species within the genus Melosira C.Agardh. The species was observed in bare, moist soil in scratches in cliffs bordering the ocean where the influence of sea spray is obvious. The description of this new species further increases the number of species of the Melosirales compared to other centric freshwater diatoms which are infrequently found on the sub-Antarctic islands. |
| Programme |
136 |
| Campaign |
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| Address |
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| Corporate Author |
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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 |
2381-8107 |
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 |
7712 |
| Permanent link to this record |
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| |
| Author |
Bart Van de Vijver, Pieter Scholberg, Marc Lebouvier |
| Title |
Pinnularia schoelynckiana, a new limnoterrestrial diatom species (Bacillariophyta) from the sub-Antarctic Iles Kerguelen (southern Indian Ocean) |
Type |
Journal |
| Year |
2019 |
Publication |
Botany Letters |
Abbreviated Journal |
|
| Volume |
167 |
Issue |
1 |
Pages |
42-49 |
| Keywords |
hot springs morphology new species Pinnularia sub-Antarctica |
| Abstract |
An unknown Pinnularia taxon was recorded during a survey of the limno-terrestrial diatom flora of some hot springs in the Val Travers area (Grande Terre, Iles Kerguelen, sub-Antarctic region). The morphology of the species was investigated using both light and scanning electron microscopy. Based on these results, the species could not be identified using the currently available literature and is therefore described as a new species: Pinnularia schoelynckiana sp. nov. The new species is characterized by rhombic-lanceolate valves, radiate, geniculate striae changing into strongly convergent near the apices and an undulating, lateral raphe. A detailed morphological comparison is made with similar Pinnularia species, described from the Antarctic Region and worldwide. Brief notes on the associated diatom flora and its ecology are added. |
| Programme |
136 |
| Campaign |
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| Address |
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| Corporate Author |
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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 |
2381-8107 |
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 |
|
Serial |
7716 |
| Permanent link to this record |
