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Author |
Aline Peltier, Arnaud Chulliat |
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Title |
On the feasibility of promptly producing quasi-definitive magnetic observatory data |
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Journal |
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Year |
2010 |
Publication |
Earth, planets and space |
Abbreviated Journal |
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Volume |
62 |
Issue |
2 |
Pages |
e5-e8 |
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Keywords |
baseline data processing geomagnetic modeling Magnetic observatory quasi-definitive data |
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Abstract |
Magnetic observatories currently distribute two types of data: preliminary data, available in less than 72 hrs in the case of INTERMAGNET observatories, and definitive baseline-corrected data, produced only once a year. Several users and groups of users have expressed the need for baseline-corrected observatory data produced in a continuous manner. The main applications for such quasi-definitive data include geomagnetic field modeling and the calculation of geomagnetic activity indices. We present an original method for producing quasi-definitive data at the end of each calendar month using temporary baselines. Preliminary and definitive data at nine INTERMAGNET observatories are used to test this method, simulating the production of quasi-definitive data throughout the year 2008. The temporary baselines obtained are very close to the definitive ones, except during the last few days of each time interval. The means and standard deviations of the differences between quasi-definitive and definitive data do not exceed 0.3 nT, well below the current INTERMAGNET standard of accuracy. This result demonstrates the feasibility of promptly producing quasi-definitive data at most magnetic observatories of INTERMAGNET type. |
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139 |
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ISSN  |
1880-5981 |
ISBN |
1880-5981 |
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yes |
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Call Number |
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Serial |
7435 |
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Title |
On the observation of magnetic events on broad-band seismometers |
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Journal |
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Year |
2020 |
Publication |
Earth, planets and space |
Abbreviated Journal |
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Volume |
72 |
Issue |
1 |
Pages |
109 |
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Keywords |
Anthropogenic sources of magnetic noise Seismic instrumentation Sudden Storm Commencements |
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133 |
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ISSN |
1880-5981 |
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yes |
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Serial |
7888 |
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Title |
Evaluation of candidate models for the 13th generation International Geomagnetic Reference Field |
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Journal |
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Year |
2021 |
Publication |
Earth, Planets and Space |
Abbreviated Journal |
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Volume |
73 |
Issue |
1 |
Pages |
48 |
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Keywords |
Geomagnetism IGRF Magnetic field modeling |
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139 |
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ISSN |
1880-5981 |
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yes |
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Serial |
7937 |
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Title |
International Geomagnetic Reference Field: the thirteenth generation |
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Journal |
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Year |
2021 |
Publication |
Earth, Planets and Space |
Abbreviated Journal |
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Volume |
73 |
Issue |
1 |
Pages |
49 |
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Keywords |
Geomagnetism IGRF Magnetic field modeling |
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Abstract |
In December 2019, the International Association of Geomagnetism and Aeronomy (IAGA) Division V Working Group (V-MOD) adopted the thirteenth generation of the International Geomagnetic Reference Field (IGRF). This IGRF updates the previous generation with a definitive main field model for epoch 2015.0, a main field model for epoch 2020.0, and a predictive linear secular variation for 2020.0 to 2025.0. This letter provides the equations defining the IGRF, the spherical harmonic coefficients for this thirteenth generation model, maps of magnetic declination, inclination and total field intensity for the epoch 2020.0, and maps of their predicted rate of change for the 2020.0 to 2025.0 time period. |
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139 |
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ISSN |
1880-5981 |
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yes |
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Call Number |
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Serial |
8085 |
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Title |
First detection of Borrelia burgdorferi sensu lato DNA in king penguins (Aptenodytes patagonicus halli).
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Journal Article |
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Year |
2014 |
Publication |
Ticks and tick-borne diseases |
Abbreviated Journal |
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Volume |
5 |
Issue |
6 |
Pages |
939-42 |
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Keywords |
Borrelia burgdorferi, Crozet Archipelago, Epidemiology, King penguins, Lyme disease, Spirochetemia, |
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Abstract |
The hard tick Ixodes uriae parasitises a wide range of seabird species in the circumpolar areas of both Northern and Southern hemispheres and has been shown to be infected with Borrelia burgdorferi sensu lato, the bacterial agents of Lyme borreliosis. Although it is assumed that seabirds represent viable reservoir hosts, direct demonstrations of infection are limited to a single study from the Northern hemisphere. Here, the blood of 50 tick-infested adult king penguins (Aptenodytes patagonicus halli) breeding in the Crozet Archipelago (Southern Indian Ocean) was examined for B. burgdorferi sl exposure by serology and for spirochetemia by in vitro DNA amplification. Four birds were found positive by serology, whereas B. burgdorferi sl DNA was detected in two other birds. Our data therefore provide the first direct proof of Borrelia burgdorferi sl spirochetes in seabirds of the Southern hemisphere and indicate a possible reservoir role for king penguins in the natural maintenance of this bacterium. Although the bacterial genetic diversity present in these hosts and the infectious period for tick vectors remain to be elucidated, our results add to a growing body of knowledge on the contribution of seabirds to the complex epizootiology of Lyme disease and the global dissemination of B. burgdorferi sl spirochetes.
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Programme |
394 |
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Series Issue |
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Edition |
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ISSN |
1877-959X |
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Approved |
yes |
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Call Number |
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Serial |
5821 |
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Author |
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Title |
Meeting the challenge of tick-borne disease control: A proposal for 1000 Ixodes genomes |
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Journal |
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Year |
2019 |
Publication |
Ticks and Tick-borne Diseases |
Abbreviated Journal |
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Volume |
10 |
Issue |
1 |
Pages |
213-218 |
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Abstract |
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Programme |
333 |
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ISSN |
1877-959X |
ISBN |
1877-959X |
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Approved |
yes |
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Call Number |
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Serial |
7432 |
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| Permanent link to this record |
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Author |
G. Hubert, S. Aubry |
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Title |
Simulation of atmospheric cosmic-rays and their impacts based on pre-calculated databases, physical models and computational methods |
Type |
Journal |
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Year |
2021 |
Publication |
Journal of Computational Science |
Abbreviated Journal |
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Volume |
51 |
Issue |
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Pages |
101307 |
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Keywords |
Ambient dose equivalent Atmospheric cosmic-rays Cosmogenic nuclide production Multi-physics Single event effect |
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Abstract |
The atmospheric cosmic-ray environment is composed of secondary particles produced when primary cosmic rays interact with the nucleus of atmospheric atoms. Modeling of atmospheric radiations is essential for investigating their impacts on human activities such as radiation risks in aviation or scientific fields such as cosmogenic dating. The nuclear transport codes are a common and accurate way to model the cosmic ray interaction in the atmosphere with minimal approximations. However, tracking all produced secondary particles in each event in the whole depth of the atmosphere and sampling many events to obtain the statistically meaningful results would be a computational challenge and disadvantageous from the point of view of time consumption. This paper presents a computational platform names ATMOS CORE based on pre-calculated databases coupled to physical models and computational methods. The fields of application concern the atmospheric cosmic-rays characterization as well as their effects on electronics systems, on the ambient dose for aircrews or the cosmogenic nuclide production for dating activities. Some comparisons between simulations and measurements are also presented and discussed. |
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Programme |
1112 |
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ISSN |
1877-7503 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
7957 |
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| Permanent link to this record |
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Author |
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Title |
A SNP-based assay in a non model species: evolutionary lineage assignment of brown trout ancient DNA
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Journal Article |
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Year |
2012 |
Publication |
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Abbreviated Journal |
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Volume |
4 |
Issue |
1 |
Pages |
59-62- |
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Keywords |
Ancient DNA, Evolutionary lineage, Homoplasy, Mitochondrial DNA, Multiplex primer extension, SNaPshot, |
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Abstract |
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Programme |
1041 |
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Publisher |
Springer Netherlands |
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ISSN |
1877-7252 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
4655 |
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Author |
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Title |
Comparative phylogeography of three trematomid fishes reveals contrasting genetic structure patterns in benthic and pelagic species
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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 |
23-34 |
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Keywords |
Microsatellite markers, Mitochondrial, Larval duration, Glaciations, Notothenioidei, Life history, |
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Abstract |
Population genetics patterns of marine fish in general and of Southern Ocean fish in particular range from virtual panmixia over ocean-wide scale to deeply fragmented populations. However the causes underlying these different patterns are not properly understood. In this paper, we tested the hypotheses that population connectivity is positively related to a combination of life history traits, namely duration of pelagic larval period and the tendency towards pelagic life style in the adulthood. To do so, we analysed the variability of six microsatellite and one mitochondrial marker (cytochrome b) in three Southern Ocean fish species (Trematomus newnesi, Trematomus hansoni and Trematomus bernacchii). They share a recent common ancestor but notably differ in their duration of pelagic larval period as well as pelagic versus benthic lifestyle. We sampled over a range of more than 5000 km for all three species and used a number of population genetics tools to investigate past and contemporary levels of connectivity. All species experienced population fluctuations, but coalescent simulations suggested that contemporary populations are in migration-drift equilibrium. Although global FST values were rather low, a significant population structure separated the High-Antarctic from the Peninsular regions in all species. The level of genetic differentiation was much lower in the pelagic versus benthic species. Present data suggest that past and present genetic structuring in the Southern Ocean are indeed related with the ecological traits of Antarctic fish, however the relative importance of individual factors remains unclear. |
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Programme |
1142 |
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Thesis |
Bachelor's thesis |
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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 |
1874-7787 |
ISBN |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
3167 |
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| Permanent link to this record |
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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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yes |
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Call Number |
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Serial |
4021 |
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