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Title |
Constraining 20th-Century Sea-Level Rise in the South Atlantic Ocean |
Type |
Journal |
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Year |
2021 |
Publication |
Journal of Geophysical Research: Oceans |
Abbreviated Journal |
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Volume |
126 |
Issue |
3 |
Pages |
e2020JC016970 |
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Keywords  |
data rescue salt-marsh proxies sea-level changes South Atlantic tide gauges |
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688 |
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2169-9291 |
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yes |
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Call Number |
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Serial |
8603 |
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Author |
S. Jevrejeva, A. Matthews, A. Slangen |
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Title |
The Twentieth-Century Sea Level Budget: Recent Progress and Challenges |
Type |
Journal |
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Year |
2017 |
Publication |
Surveys in Geophysics |
Abbreviated Journal |
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Volume |
38 |
Issue |
1 |
Pages |
295-307 |
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Keywords |
Data archeology Observing system Sea level budget Sea level rise |
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688 |
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ISSN |
1573-0956 |
ISBN |
1573-0956 |
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yes |
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Call Number |
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Serial |
7051 |
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Title |
On the seasonal asymmetry of the diurnal and semidiurnal geomagnetic variations |
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Journal Article |
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Year |
2005 |
Publication |
Journal of geophysical research-atmospheres |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
110 |
Issue |
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Pages |
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Keywords |
daily variation; lower thermospheric winds; ionospheric dynamo; current system; geomagnetic activity; equinoxes; 1555 Geomagnetism and Paleomagnetism: Time variations: diurnal to decadal; 2437 Ionosphere: Ionospheric dynamics; 3369 Atmospheric Processes: Thermospheric dynamics; 3389 Atmospheric Processes: Tides and planetary waves |
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Abstract |
The diurnal and semidiurnal variations of the geomagnetic field are investigated at 18 observatories using long series of hourly values (up to 97 years at Sitka). The seasonal variations of amplitude of the 12-hour and 24-hour lines are obtained for the H and Z components using a 28-day sliding window. The Fourier analysis is performed using either all days within the window or only the five quietest days. At midlatitudes a strong lack of symmetry about the summer solstice is observed for both lines and both components. This effect is enhanced when selecting quiet days. When averaged over the entire series, the sign of this seasonal asymmetry is the same at 9 out of 10 midlatitude observatories for both lines and for a given component; it is opposite for the H and Z components. Such a coherent seasonal asymmetry is not found at low and high latitudes. At high latitudes a strong annual variation is found inside the polar caps, while a strong semiannual variation is found in the auroral zones. When selecting quiet days, these two effects are weaker, and the seasonal asymmetry becomes comparable to that at midlatitudes. At all latitudes the year-to-year variations of the seasonal asymmetry are uncorrelated with solar activity. It is suggested that lower thermospheric winds may have a similar seasonal asymmetry between spring and autumn equinoxes. Such an asymmetry is present in the published literature but has been overlooked. Possible causes for this wind asymmetry are reviewed. |
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Programme |
139 |
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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 |
5485 |
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Title |
Overcoming deterrent metabolites by gaining essential nutrients: A lichen/snail case study |
Type |
Journal |
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Year |
2019 |
Publication |
Phytochemistry |
Abbreviated Journal |
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Volume |
164 |
Issue |
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Pages |
86-93 |
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Keywords |
D-arabitol; Feeding choice; Lichen; Mass spectrometry imaging; Parmeliaceae; Snail; Usnic acid |
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Abstract |
Specialised metabolites in lichens are generally considered repellent compounds by consumers. Nevertheless, if the only food available is lichens rich in specialised metabolites, lichenophages must implement strategies to overcome the toxicity of these metabolites. Thus, the balance between phagostimulant nutrients and deterrent metabolites could play a key role in feeding preferences. To further understand lichen-gastropod interactions, we studied the feeding behaviour and consumption in Notodiscus hookeri, the land snail native to sub-Antarctic islands. The lichen Usnea taylorii was used because of its simple chemistry, its richness in usnic acid (specialised metabolite) and arabitol (primary metabolite) and its presence in snail habitats. Choice tests in arenas with intact lichens versus acetone-rinsed lichens were carried out to study the influence of specialised metabolites on snail behaviour and feeding preference. Simultaneously, usnic acid and arabitol were quantified and located within the lichen thallus using HPLC-DAD-MS and in situ imaging by mass spectrometry to assess whether their spatial distribution explained preferential snail grazing. No-choice feeding experiments, with the pure metabolites embedded in an artificial diet, defined a gradual gustatory response, from strong repellence (usnic acid) to high appetence (D-arabitol). This case study demonstrates that the nutritional activity of N. hookeri is governed by the chemical quality of the food and primarily by nutrient availability (arabitol), despite the presence of deterrent metabolite (usnic acid). |
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Programme |
136 |
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Thesis |
Bachelor's thesis |
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Edition |
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ISSN |
0031-9422 |
ISBN |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
7652 |
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Author |
Dettai A, Berkani M, Lautredou A-C, Couloux A, Lecointre G, Ozouf-Costaz C, Gallut C, |
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Title |
Tracking the elusive monophyly of nototheniid fishes (Teleostei) with multiple mitochondrial and nuclear markers
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Type |
Journal Article |
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Year |
2012 |
Publication |
Marine Genomics |
Abbreviated Journal |
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Volume |
8 |
Issue |
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Pages |
49-58 |
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Keywords |
Cytochrome oxidase 1, Phylogeny, Congruence, Simultaneous analysis, |
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Abstract |
Since the first molecular study of the suborder Notothenioidei in 1994, many phylogenetic studies have been published. Among these, those with a sufficient number of taxa have all suggested that the Nototheniidae, as currently defined, is monophyletic only with the inclusion of the Channichthyidae, Artedidraconidae, Bathydraconidae and Harpagiferidae. This is corroborated by more recent studies including more taxa, but in these studies either the number of nuclear markers or the number of taxa included remained low. We obtained sequences for a large sampling covering most nototheniid genera for five markers described previously for other samplings (COI, Rhodopsin retrogene, Pkd1, HECW2, and SSRP1) and one nuclear marker never used before in phylogenetic inference (PPM1d). The topology for the combined analysis of the nuclear coding genes, as well as the topology for SSRP1 (non-coding) and the combined analysis for all markers all support the paraphyly of Nototheniidae, the genus Notothenia (including Paranotothenia) is the sister group of the clade Channichthyidae, Artedidraconidae, Bathydraconidae and Harpagiferidae, and genus Gobionotothen is a sister group to both. As in previous studies, Trematomus, Lepidonotothen and Patagonotothen form a clade that also includes Indonotothenia cyanobrancha. The position of Pleuragramma antarctica, Dissostichus species and Aethotaxis mitopteryx remains unstable and dependant on markers and analyses. |
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Programme |
1124 |
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ISSN |
1874-7787 |
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Approved |
yes |
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Call Number |
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Serial |
4021 |
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Author |
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Title |
Sunlight-driven nitrate loss records Antarctic surface mass balance |
Type |
Journal |
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Year |
2022 |
Publication |
Nature Communications |
Abbreviated Journal |
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Volume |
13 |
Issue |
1 |
Pages |
4274 |
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Keywords |
Cryospheric science Environmental chemistry Palaeoclimate |
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Abstract |
Standard proxies for reconstructing surface mass balance (SMB) in Antarctic ice cores are often inaccurate or coarsely resolved when applied to more complicated environments away from dome summits. Here, we propose an alternative SMB proxy based on photolytic fractionation of nitrogen isotopes in nitrate observed at 114 sites throughout East Antarctica. Applying this proxy approach to nitrate in a shallow core drilled at a moderate SMB site (Aurora Basin North), we reconstruct 700 years of SMB changes that agree well with changes estimated from ice core density and upstream surface topography. For the under-sampled transition zones between dome summits and the coast, we show that this proxy can provide past and present SMB values that reflect the immediate local environment and are derived independently from existing techniques. |
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Programme |
1177 |
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Edition |
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ISSN |
2041-1723 |
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Approved |
yes |
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Call Number |
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Serial |
8592 |
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Author |
M. Leduc-Leballeur, G. Picard, G. Macelloni, L. Arnaud, M. Brogioni, A. Mialon, Y. H. Kerr |
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Title |
Influence of snow surface properties on L-band brightness temperature at Dome C, Antarctica |
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Journal |
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Year |
2017 |
Publication |
Remote Sensing of Environment |
Abbreviated Journal |
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Volume |
199 |
Issue |
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Pages |
427-436 |
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Keywords |
Cryosphere Microwave SMOS Snow emission modeling |
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Abstract |
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Programme |
1110 |
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ISSN |
0034-4257 |
ISBN |
0034-4257 |
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yes |
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Call Number |
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Serial |
6774 |
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Author |
Giovanni Macelloni, Marion Leduc-Leballeur, Francesco Montomoli, Marco Brogioni, Catherine Ritz, Ghislain Picard |
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Title |
On the retrieval of internal temperature of Antarctica Ice Sheet by using SMOS observations |
Type |
Journal |
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Year |
2019 |
Publication |
Remote Sensing of Environment |
Abbreviated Journal |
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Volume |
233 |
Issue |
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Pages |
111405 |
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Keywords |
Cryosphere L band Snow/ice microwave emission model |
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Abstract |
Internal temperature is an essential parameter for understanding ice sheet dynamics. Glaciological models provide estimations of temperature profiles over Antarctica and few boreholes are also available, but, at present, no measurement exists at the scale of the whole continent. The analysis of passive L-band observations from the Soil Moisture and Ocean Salinity (SMOS) satellite shows that, thanks to the high penetration depth (i.e. up to 1500?m), it is possible to infer information on in depth glaciological properties of the ice sheet including temperature. In this study, the temperature profile is retrieved from SMOS observations using jointly glaciological and emission models. The developed methodology is valid in the inner part of Antarctica where the ice sheet is almost stable (i.e. its velocity is limited to 10?m?yr?1). This analysis points out that in several cases, differences are observed between retrieved temperature profiles and those predicted by glaciological models. In particular, some geophysical parameters, namely the geothermal heat flux and the mean annual accumulation, need to be modified with respect to their prior values in order to simulate SMOS brightness temperatures. Results also clearly show that the reliability of the retrieved profile in depth decreases with increasing ice thickness due to the limited penetration of microwaves in the ice. The obtained results prove the capability of L band (1.4?GHz) passive microwave sensors for investigating the internal temperature of the ice-sheet. |
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1110 |
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ISSN |
0034-4257 |
ISBN |
0034-4257 |
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Approved |
yes |
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Call Number |
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Serial |
6977 |
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Title |
Microstructures, deformation mechanisms and seismic properties of a Palaeoproterozoic shear zone: The Mertz shear zone, East-Antarctica |
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Journal |
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Year |
2016 |
Publication |
Tectonophysics |
Abbreviated Journal |
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Volume |
680 |
Issue |
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Pages |
174-191 |
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Keywords |
Crustal deformation Crystallographic preferred orientation (CPO) East Antarctica Microstructures Shear zone Strain localization |
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Abstract |
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Programme |
1003 |
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ISSN |
0040-1951 |
ISBN |
0040-1951 |
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yes |
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Call Number |
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Serial |
6748 |
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Title |
Adjustment of pre-moult foraging strategies in Macaroni Penguins Eudyptes chrysolophus according to locality, sex and breeding status
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Type |
Journal Article |
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Year |
2014 |
Publication |
Ibis |
Abbreviated Journal |
Ibis (Lond. 1859) |
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Volume |
156 |
Issue |
3 |
Pages |
511-522 |
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Keywords |
Crested Penguins, light-based geolocation, marine habitat, marine resources, non-breeding, Southern Ocean, specialization, stable isotopes, |
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Abstract |
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Programme |
109 |
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ISSN |
1474-919X |
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yes |
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Call Number |
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Serial |
5116 |
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