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Title |
Quality Assessment of the First Measurements of Tropospheric Water Vapor and Temperature by the HAMSTRAD Radiometer Over Concordia Station, Antarctica
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Journal Article |
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Year |
2013 |
Publication |
Geoscience and Remote Sensing, IEEE Transactions on |
Abbreviated Journal |
0196-2892 |
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Volume |
PP |
Issue |
99 |
Pages |
1-23 |
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Keywords  |
Extraterrestrial measurements, Instruments, Microwave radiometry, Ocean temperature, Temperature measurement, Terrestrial atmosphere, Water, Antarctica, atmospheric measurements, humidity measurements, least squares methods, microwave measurements, microwave radiometry, temperature measurements, time series analysis, |
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910,1013 |
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Bachelor's thesis |
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0196-2892 |
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yes |
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Serial |
660 |
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Author |
Manon Battandier |
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2018 |
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1120 |
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yes |
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Serial |
7197 |
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Title |
Extensive air shower Monte Carlo modeling at the ground and aircraft flight altitude in the South Atlantic Magnetic Anomaly and comparison with neutron measurements |
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Journal |
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Year |
2017 |
Publication |
Astroparticle Physics |
Abbreviated Journal |
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Volume |
88 |
Issue |
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Pages |
17-29 |
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Keywords |
Extensive air shower modeling Flight altitude Geant4 MCNPX Monte Carlo method simulation South Atlantic Magnetic Anomaly |
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Abstract |
Modeling cosmic-ray-induced particle fluxes in the atmosphere is very important for developing many applications in aeronautics, space weather and on ground experimental arrangements. There is a lack of measurements and modeling at flight altitude and on ground in the South Atlantic Magnetic Anomaly. In this work we have developed an application based on the Geant4 toolkit called gPartAt that is aimed at the analysis of extensive air shower particle spectra. Another application has been developed using the MCNPX code with the same approach in order to evaluate the models and nuclear data libraries used in each application. Moreover, measurements were performed to determine the ambient dose equivalent rate of neutrons at flight altitude in different regions and dates in the Brazilian airspace; these results were also compared with the simulations. The results from simulations of the neutron spectra at ground level were also compared to data from a neutron spectrometer in operation since February 2015 at the Pico dos Dias Observatory in Brazil, at 1864m above sea level, as part of a collaboration between the Institute for Advanced Studies (IEAv) and the French Aerospace Lab (ONERA). This measuring station is being operated with support from the National Astrophysics Laboratory (LNA). The modeling approaches were also compared to the AtmoRad computational platform, QARM, EXPACS codes and with measurements of the neutron spectrum taken in 2009 at the Pico dos Dias Observatory. |
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1112 |
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0927-6505 |
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0927-6505 |
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yes |
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Call Number |
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Serial |
6723 |
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Title |
Extensive air shower Monte Carlo modeling at the ground and aircraft flight altitude in the South Atlantic Magnetic Anomaly and comparison with neutron measurements |
Type |
Journal |
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Year |
2017 |
Publication |
Astroparticle Physics |
Abbreviated Journal |
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Volume |
88 |
Issue |
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Pages |
17-29 |
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Keywords |
Extensive air shower modeling Flight altitude Geant4 MCNPX Monte Carlo method simulation South Atlantic Magnetic Anomaly |
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Abstract |
Modeling cosmic-ray-induced particle fluxes in the atmosphere is very important for developing many applications in aeronautics, space weather and on ground experimental arrangements. There is a lack of measurements and modeling at flight altitude and on ground in the South Atlantic Magnetic Anomaly. In this work we have developed an application based on the Geant4 toolkit called gPartAt that is aimed at the analysis of extensive air shower particle spectra. Another application has been developed using the MCNPX code with the same approach in order to evaluate the models and nuclear data libraries used in each application. Moreover, measurements were performed to determine the ambient dose equivalent rate of neutrons at flight altitude in different regions and dates in the Brazilian airspace; these results were also compared with the simulations. The results from simulations of the neutron spectra at ground level were also compared to data from a neutron spectrometer in operation since February 2015 at the Pico dos Dias Observatory in Brazil, at 1864m above sea level, as part of a collaboration between the Institute for Advanced Studies (IEAv) and the French Aerospace Lab (ONERA). This measuring station is being operated with support from the National Astrophysics Laboratory (LNA). The modeling approaches were also compared to the AtmoRad computational platform, QARM, EXPACS codes and with measurements of the neutron spectrum taken in 2009 at the Pico dos Dias Observatory. |
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Programme |
1112 |
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ISSN |
0927-6505 |
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0927-6505 |
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Notes |
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yes |
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Call Number |
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Serial |
7035 |
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Title |
Analysis of growth and form in Aerothyris kerguelenensis (rhynchonelliform brachiopod) – Shell spiral deviations, microstructure, trace element contents and stable isotope ratios |
Type |
Journal |
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Year |
2018 |
Publication |
Chemical Geology |
Abbreviated Journal |
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Volume |
483 |
Issue |
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Pages |
474-490 |
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Keywords |
Extant brachiopods Growth patterns Microstructure Shell spiral deviations Stable isotopes Trace elements |
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Programme |
1044 |
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ISSN |
0009-2541 |
ISBN |
0009-2541 |
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Notes |
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yes |
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Call Number |
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Serial |
7104 |
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Title |
Fishing behaviours and fisher effect in decision-making processes when facing depredation by marine predators |
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Journal |
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Year |
2021 |
Publication |
Fisheries Management and Ecology |
Abbreviated Journal |
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Volume |
28 |
Issue |
6 |
Pages |
528-541 |
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Abstract |
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Programme |
109 |
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ISSN |
1365-2400 |
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Approved |
yes |
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Call Number |
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Serial |
8307 |
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Title |
Water Isotopic Signature of Surface Snow Metamorphism 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 |
17 |
Pages |
e2021GL093382 |
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Keywords |
excess Ice cores metamorhism Paleoclimate water isotopes |
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Abstract |
Water isotope ratios of ice cores are a key source of information on past temperatures. Through fractionation within the hydrological cycle, temperature is imprinted in the water isotopic composition of snowfalls. However, this signal of climatic interest is modified after deposition when snow remains at the surface exposed to the atmosphere. Comparing time series of surface snow isotopic composition at Dome C with satellite observations of surface snow metamorphism, we found that long summer periods without precipitation favor surface snow metamorphism altering the surface snow isotopic composition. Using excess parameters (combining D,17O, and 18O fractions) allow the identification of this alteration caused by sublimation and condensation of surface hoar. The combined measurement of all three isotopic compositions could help identifying ice core sections influenced by snow metamorphism in sites with very low snow accumulation. |
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Programme |
1110 |
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ISSN |
1944-8007 |
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yes |
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Call Number |
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Serial |
8306 |
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Author |
D. Noll, F. Leon, D. Brandt, P. Pistorius, C. Le Bohec, F. Bonadonna, P. N. Trathan, A. Barbosa, A. Raya Rey, G. P. M. Dantas, R. C. K. Bowie, E. Poulin, J. A. Vianna |
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Title |
Positive selection over the mitochondrial genome and its role in the diversification of gentoo penguins in response to adaptation in isolation |
Type |
Journal |
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Year |
2022 |
Publication |
Scientific Reports |
Abbreviated Journal |
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Volume |
12 |
Issue |
1 |
Pages |
3767 |
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Keywords |
Evolution Evolutionary genetics |
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Abstract |
Although mitochondrial DNA has been widely used in phylogeography, evidence has emerged that factors such as climate, food availability, and environmental pressures that produce high levels of stress can exert a strong influence on mitochondrial genomes, to the point of promoting the persistence of certain genotypes in order to compensate for the metabolic requirements of the local environment. As recently discovered, the gentoo penguins (Pygoscelis papua) comprise four highly divergent lineages across their distribution spanning the Antarctic and sub-Antarctic regions. Gentoo penguins therefore represent a suitable animal model to study adaptive processes across divergent environments. Based on 62 mitogenomes that we obtained from nine locations spanning all four gentoo penguin lineages, we demonstrated lineage-specific nucleotide substitutions for various genes, but only lineage-specific amino acid replacements for the ND1 and ND5 protein-coding genes. Purifying selection (dN/dS??1) was mostly present in codons of the Complex I (NADH genes), supported by two different codon-based methods at the ND1 and ND4 in the most divergent lineages, the eastern gentoo penguin from Crozet and Marion Islands and the southern gentoo penguin from Antarctica respectively. Additionally, ND5 and ATP6 were under selection in the branches of the phylogeny involving all gentoo penguins except the eastern lineage. Our study suggests that local adaptation of gentoo penguins has emerged as a response to environmental variability promoting the fixation of mitochondrial haplotypes in a non-random manner. Mitogenome adaptation is thus likely to have been associated with gentoo penguin diversification across the Southern Ocean and to have promoted their survival in extreme environments such as Antarctica. Such selective processes on the mitochondrial genome may also be responsible for the discordance detected between nuclear- and mitochondrial-based phylogenies of gentoo penguin lineages. |
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Programme |
137,354 |
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Thesis |
Bachelor's thesis |
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ISSN |
2045-2322 |
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yes |
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Call Number |
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Serial |
8457 |
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Title |
Service of rapid magnetic variations, an update |
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Journal |
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Year |
2023 |
Publication |
Geoscience Data Journal |
Abbreviated Journal |
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Volume |
10 |
Issue |
1 |
Pages |
99-113 |
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Keywords |
event detection ISGI – International Service of Geomagnetic Indices rapid magnetic variations solar flare effects storm sudden commencements |
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Abstract |
Rapid magnetic variations on Earth are intimately linked with solar activity and this is one of the main topics in Space Weather research. Modelling and forecasting these phenomena are vital in our technological society. The Service of Rapid Magnetic Variations provides lists of these remarkable magnetic events in a continuous way in what constitutes a long geophysical series that began in the late 19th century. Although the aim of this Service remains unchanged, methods have changed with time. Here, we describe the recent evolution of the Service, its database and the latest works carried out to improve the products delivered to the scientific society. |
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Programme |
139 |
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ISSN |
2049-6060 |
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yes |
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Call Number |
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Serial |
8640 |
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Author |
Vallet Carole, Labat Jean-Philippe, Smith Martina, Koubbi Philippe, |
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Title |
Interannual variations in euphausiid life stage distribution in the Dumont dUrville Sea from 2004 to 2008
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Type |
Journal Article |
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Year |
2011 |
Publication |
Polar Science |
Abbreviated Journal |
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Volume |
5 |
Issue |
2 |
Pages |
166-178 |
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Keywords |
Euphausia crystallorophias, Thysanoessa macrura, Antarctic, Abundance, Spatial distribution, Environmental factors, |
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Programme |
1142 |
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ISSN |
1873-9652 |
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yes |
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Call Number |
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Serial |
3326 |
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