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Author |
Picard G, Domine F, Krinner G, Arnaud L, Lefebvre E, |
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Title |
Inhibition of the positive snow-albedo feedback by precipitation in interior Antarctica |
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Journal |
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Year |
2012 |
Publication |
Nature Climate Change |
Abbreviated Journal |
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Volume |
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Issue |
11 |
Pages |
795-798 |
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Keywords |
limate change Cryospheric science |
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Programme |
1013 |
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Bachelor's thesis |
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Publisher |
Nature Publishing Group |
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ISSN |
1758-6798 |
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yes |
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Serial |
456 |
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Author |
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Title |
Candidate models for the IGRF 11th generation making use of extrapolated observatory data
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Type |
Journal Article |
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Year |
2010 |
Publication |
Earth Planets and Space |
Abbreviated Journal |
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Volume |
62 |
Issue |
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Pages |
745 -751 |
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Abstract |
Three candidate models are produced in response to the call for IGRF-11 models. A main field model around epoch 2005.0 is based on one year of Oersted and CHAMP measurements, and is proposed for the definitive model for epoch 2005.0. A main field model around epoch 2009.5, based on two months of CHAMP measurements and extrapolated to 2010.0, is proposed as a main field model for epoch 2010.0. A secular variation model valid for 2010.0-2015.0, based on the extrapolation through exponential
smoothing of observatory monthly mean values, is proposed as a predictive secular variation model. Comparison of similar extrapolations made for previous IGRF generations with actual observations are presented and discussed. |
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Programme |
139;905 |
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Bachelor's thesis |
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ISSN |
1343-8832 |
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yes |
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Call Number |
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Serial |
2464 |
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Title |
Continuous 25-yr aerosol records at coastal Antarctica I: inter-annual variability of ionic compounds and links to climate indices |
Type |
Journal Article |
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Year |
2011 |
Publication |
Tellus B |
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 |
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Programme |
414 |
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Thesis |
Bachelor's thesis |
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Publisher |
Blackwell Publishing Ltd |
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Series Issue |
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Edition |
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ISSN |
1600-0889 |
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yes |
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Call Number |
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Serial |
2549 |
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Author |
Jaffal A, Paris-Palacios S, Jolly S, Thailly A F, Delahaut L, Beall E, Roche H, Biagianti-Risbourg S, Betoulle S, |
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Title |
Cadmium and copper contents in a freshwater fish species (brook trout, Salvelinus fontinalis) from the subantarctic Kerguelen Islands
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Type |
Journal Article |
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Year |
2011 |
Publication |
Polar Biology |
Abbreviated Journal |
Polar Biol. |
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Volume |
34 |
Issue |
3 |
Pages |
397 -409 |
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Abstract |
The subantarctic Kerguelen Islands (49 degrees S, 70 degrees E) contain freshwaters among the most isolated in the world from direct human activities. Cadmium and copper concentrations were analyzed in muscle and liver tissues of 57 non-migratory brook trout (Salvelinus fontinalis) inhabiting the Sud River of Kerguelen Islands. The mean cadmium concentration in liver was 1.13 mu g/g dry wt, within the range of levels measured in liver of marine fish from the Southern Ocean. Muscular Cd levels (0.12 mu g/g dry wt) were roughly ten times higher than those measured in Kerguelen's marine fish species. Copper levels were very high in the two organs (62.27 mu g/g dry wt in liver and 3.02 mu g/g dry wt in muscle) compared to those detected in fish from the Southern Ocean. Regarding the seasonal trend, the highest Cu and Cd muscular levels were measured in fish at the end of the austral winter, whereas the highest hepatic levels were observed at the end of the austral summer. Moreover, hepatic cadmium levels were higher in females than in males. These results could be related to brook trout spawning physiological preparations and foraging behavior during the summer period. We provide here the first results about Cu and Cd levels in liver and muscle of a freshwater fish species in an insular subantarctic context. They are in agreement with the high cadmium contamination found in fish of the Southern Ocean.
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Programme |
409;1041 |
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Thesis |
Bachelor's thesis |
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Series Editor |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0722-4060 |
ISBN |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
2620 |
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Author |
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Title |
First Report of Nasturtium as a Natural Host of Cherry leaf roll virus on Amsterdam Island
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Type |
Journal Article |
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Year |
2010 |
Publication |
PLANT DISEASE |
Abbreviated Journal |
Plant Dis. |
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Volume |
94 |
Issue |
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Pages |
477 |
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Keywords |
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Abstract |
Cherry leaf roll virus (CLRV) is a well-known virus belonging to the genus Nepovirus, but unlike most members of this genus, it is not known to be transmitted by nematodes but only through seeds and pollen. Since its first description in 1955 on Prunus avium L. in England (1), CLRV has been shown to have a worldwide distribution and a wide natural host range. During a survey of plant viruses in the French sub-Antarctic islands, samples from nasturtium plants (Tropaeolum majus), an introduced plant species, showing symptoms of leaf mosaic, deformation, and veinal necrosis were collected on Amsterdam Island. Upon mechanical transmission with sap extracts, necrotic ringspot and oak-leaf symptoms typical of Nepovirus infection were observed on the leaves of inoculated Nicotiana clevelandii and N. tabacum plants. Inoculation of healthy nasturtium plants resulted in mosaic and pin-point necrosis symptoms. Electron microscopy on negatively stained sap extracts revealed the presence of icosahedral virions, 28 to ...
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Programme |
136 |
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Corporate Author |
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Thesis |
Bachelor's thesis |
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Publisher |
The American Phytopathological Society |
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Series Editor |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0191-2917 |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
2661 |
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Author |
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Title |
Introduced black rats Rattus rattus on Ile de la Possession (Iles Crozet, Subantarctic): diet and trophic position in food webs
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Type |
Journal Article |
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Year |
2011 |
Publication |
Polar Biology |
Abbreviated Journal |
Polar Biol. |
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Volume |
34 |
Issue |
2 |
Pages |
169-180 -180 |
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Keywords |
Biomedical and Life Sciences, |
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Abstract |
Rats introduced on islands can affect ecosystem structure and function by feeding on terrestrial plants and both marine and terrestrial animals. The diet and trophic position of Rattus rattus introduced on Ile de la Possession (Iles Crozet) was assessed from two sites, according to the presence or absence of a king penguin colony. We used three complementary assays: macroanalyses of the stomach, faecal microhistology, and stable isotope analyses of 15N/13C in liver. Near the rookery, spermatophytes contributed on average 50% (confidential interval: 2375) to the diet based on isotopes, mainly consisting in reproductive parts of Poa spp., Agrostis magellanica, and Cerastium fontanum identified in faeces. Terrestrial animal preys were represented by insects that contributed 25% (056) in isotopes, dominated in faeces by caterpillars of Pringleophaga spp. and adult weevils. Bird remains were found in faeces, forming 18% (630) of isotopes. Terrestrial earthworms contributed to 7% (021), with chaetae observed in faeces. On the other site, spermatophytes represented 62% (5173) of assimilated food in rats livers, mainly formed by Poaceae and Acaena magellanica, insects by caterpillars [24% (1039)], and terrestrial earthworms [13% (223)]. Our results suggest that rats, which were found at the top of terrestrial food chains, may have a direct role on a such simplified ecosystem, by preying on the most abundant and largest body-sized terrestrial invertebrates,e.g. the keystone species Pringleophaga spp., and by feeding on both reproductive and vegetative parts of autochthonous and introduced plants. The discrepancies and usefulness of employing both isotopes and faecal analyses are discussed. |
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Programme |
136 |
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Address |
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Corporate Author |
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Thesis |
Bachelor's thesis |
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Publisher |
Springer Berlin / Heidelberg |
Place of Publication |
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Editor |
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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 |
0722-4060 |
ISBN |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
2671 |
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| Permanent link to this record |
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Author |
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Title |
International Geomagnetic Reference Field: the eleventh generation
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Type |
Journal Article |
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Year |
2010 |
Publication |
Geophysical Journal International |
Abbreviated Journal |
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Volume |
183 |
Issue |
3 |
Pages |
1216 -1230 |
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Keywords |
Magnetic field, Satellite magnetics, |
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Abstract |
SUMMARY The eleventh generation of the International Geomagnetic Reference Field (IGRF) was adopted in December 2009 by the International Association of Geomagnetism and Aeronomy Working Group V-MOD. It updates the previous IGRF generation with a definitive main field model for epoch 2005.0, a main field model for epoch 2010.0, and a linear predictive secular variation model for 2010.02015.0. In this note the equations defining the IGRF model are provided along with the spherical harmonic coefficients for the eleventh generation. Maps of the magnetic declination, inclination and total intensity for epoch 2010.0 and their predicted rates of change for 2010.02015.0 are presented. The recent evolution of the South Atlantic Anomaly and magnetic pole positions are also examined.
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Programme |
139;905 |
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Address |
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Corporate Author |
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Thesis |
Bachelor's thesis |
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Publisher |
Blackwell Publishing Ltd |
Place of Publication |
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Series Editor |
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Series Issue |
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Edition |
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ISSN |
1365-246X |
ISBN |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
2683 |
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Author |
Branger Karine, Drillet Yann, Houssais Marie-Nolle, Testor Pierre, Bourdall-Badie Romain, Alhammoud Bahjat, Bozec Alexandra, Mortier Laurent, Bouruet-Aubertot Pascale, Crpon Michel, |
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Title |
Impact of the spatial distribution of the atmospheric forcing on water mass formation in the Mediterranean Sea
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Type |
Journal Article |
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Year |
2010 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
115 |
Issue |
C12 |
Pages |
C12041 - |
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Keywords |
Mediterranean Sea, deep water formation, numerical modeling, atmospheric forcing, 4504 Oceanography: Physical: Air/sea interactions, 4215 Oceanography: General: Climate and interannual variability, 4513 Oceanography: Physical: Decadal ocean variability, 4283 Oceanography: General: Water masses, 4520 Oceanography: Physical: Eddies and mesoscale processes, |
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Abstract |
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Programme |
452 |
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Address |
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Corporate Author |
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Thesis |
Bachelor's thesis |
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Publisher |
AGU |
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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Series Issue |
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Edition |
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ISSN |
0148-0227 |
ISBN |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
2693 |
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Author |
Coco I, Amata E, Marcucci M F, Ambrosino D, Villain J-P, Hanuise C, |
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Title |
The effects of an interplanetary shock on the high-latitude ionospheric convection during an IMF By-dominated period
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Type |
Journal Article |
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Year |
2008 |
Publication |
Ann. Geophys. |
Abbreviated Journal |
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Volume |
26 |
Issue |
9 |
Pages |
2937-2951 |
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Keywords |
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Abstract |
On 6 January 1998 an interplanetary shock hit the magnetosphere around 14:15 UT and caused a reconfiguration of the northern high-latitude ionospheric convection. We use SuperDARN, spacecraft and ground magnetometer data to study such reconfiguration. We find that the shock front was tilted towards the morning flank of the magnetosphere, while the Interplanetary Magnetic Field (IMF) was By-dominated, with By<0, IMF Bz>0 and |By|>>Bz. As expected, the magnetospheric compression started at the first impact point of the shock on the magnetopause causing an increase of the Chapman-Ferraro current from dawn to dusk and yielding an increase of the geomagnetic field at the geostationary orbit and on the ground. Moreover, the high-latitude magnetometer data show vortical structures clearly related to the interaction of the shock with the magnetosphere-ionosphere system. In this context, the SuperDARN convection maps show that at very high latitudes above the northern Cusp and in the morning sector, intense sunward convection fluxes appear, well correlated in time with the SI arrival, having a signature typical for Bz>0 dominated lobe reconnection. We suggest that in this case the dynamic pressure increase associated to the shock plays a role in favouring the setting up of a new lobe merging line albeit |By|>>Bz≥0. |
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Programme |
312;911 |
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Address |
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Corporate Author |
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Thesis |
Bachelor's thesis |
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Publisher |
Copernicus Publications |
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 |
1432-0576 |
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 |
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Call Number |
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Serial |
2731 |
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| Permanent link to this record |
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Author |
Lukianova R, Hanuise C, Christiansen F, |
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Title |
Asymmetric distribution of the ionospheric electric potential in the opposite hemispheres as inferred from the SuperDARN observations and FAC-based convection model
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Type |
Journal Article |
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Year |
2008 |
Publication |
Journal of Atmospheric and Solar-Terrestrial Physics |
Abbreviated Journal |
1364-6826 |
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Volume |
70 |
Issue |
18 |
Pages |
2324-2335 |
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Keywords |
Ionosphere, Convection, Field-aligned currents, SuperDARN, |
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Abstract |
We compare the SuperDARN convection patterns with the predictions of a new numerical model of the global distribution of ionospheric electric potentials. The model utilizes high-precision statistical maps of field-aligned currents (FAC) derived from measurements made by polar-orbiting low-altitude satellites. Both the solar and auroral precipitation contributions are included in order to derive the ionospheric conductance. Taking into account the electrodynamic coupling of the opposite hemispheres, the model allows one to obtain the convection patterns developed simultaneously in both hemispheres for given input parameters. SuperDARN, with its database containing global northern and southern convection maps, provides the unique opportunity to compare the model predictions of electric fields with observations. In the present study we focus on the effect of significant interhemispheric asymmetry governed by the IMF clock angle and solar zenith angle. We calculate the convection patterns for specific cases caused by the sign of BY and season and demonstrate the capability of the FAC-based model reproduce the radar observations. The simulation confirms that the solar zenith angle should be linked to the IMF clock angle to fully characterize the convection patterns. The model predicts that the cross-polar cap potential drop is regularly larger in the winter hemisphere than in the summer hemisphere. |
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Programme |
312;911 |
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Address |
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Corporate Author |
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Thesis |
Bachelor's thesis |
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Publisher |
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Place of Publication |
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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 |
1364-6826 |
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 |
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Call Number |
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Serial |
2743 |
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| Permanent link to this record |
