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Author Glasmacher U., Lang M., Klemme S., Moine B., Barbero L., Neumann R. & Wagner G. openurl 
  Title (up) Alpha-recoil tracks in natural dark-mica: dating geological samples by optical and scanning force microscopy. Type Journal Article
  Year 2003 Publication Nuclear instruments & methods in physics research section a-accelerators spectrometers detectors and associated equipment Abbreviated Journal  
  Volume B 209 Issue Pages 351-356  
  Keywords  
  Abstract  
  Programme 251  
  Campaign  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0168-9002 ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 2422  
Permanent link to this record
 
 
Author Dobrica E., Engrand C., Ogliore R.C., Brearley A. J. file  openurl
  Title (up) Alteration versus morphology of Antarctic micrometeorites: a simple procedure for sample characterization – Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse Type Conference - International - Communication
  Year 2019 Publication 50th Lunar and Planetary Science Conference 2019, #1014 Abbreviated Journal  
  Volume 50 Issue Pages  
  Keywords  
  Abstract Introduction: About thirty percent of Antarctic micrometeorites (AMMs) collected in surface snow layers near the French-Italian station CONCORDIA are fine-grained (Fg) particles [1-2]. Among the Fg particles, about 20% are fine-grained compact (FgC) and 10% are fine-grained fluffy (FgF) [2]. The description and classification of Fg AMMs as defined in Genge et al. [3] is based on Cap Prudhomme AMMs (collected from blue ice [4]) that do not contain the FgF particles. The FgF AMMs were later identified in the CONCORDIA AMMs collected from snow [2]. Therefore, robust criteria are essential to classify the different types of AMM more definitively. We are exploring the possibility that the surface morphology of AMMs, may be a useful and simple criterion for distinguishing between different types of AMM. Here we present the results of image analysis of Fg AMMs. The purposes of these measurements are (1) to evaluate the surface structure and sample morphology of the Fg AMMs and (2) to determine if there is a relationship between surface structure and the degree of alteration/ primitiveness of the particles. Therefore, the basis of this study is the hypothesis that the surface structure of a fragment reflects the characteristics, e.g. grain size, morphology, and the porosity of the bulk material. Methods: AMMs are split into several fragments of which the smallest is deposited on a stub and characterized by SEM, to ensure its extraterrestrial (ET) nature. Secondary electron images were performed on four AMMs stubs (08-33, 08-34, 11-13, and 14-03) using a FEI Quanta 3D field emission gun (FEG) SEM/FIB operating at 5 kV and 20 kV. On each stub there are between 18 to 42 fragments of AMMs collected from snow during the 2006 campaign [1]. Since the samples were fragmented, the exposed surface does not necessarily represent the external surface during atmospheric entry. The proportion of extraterrestrial particles on each stub vary from 48% ET (stub 11-13) to 94% ET (stub 08-33). Forty-six Fg AMMs were identified in these four stubs. The image processing and analysis of the Fg AMM images were performed using ImageJ public domain software program (http://rsb.info.nih.gov/ij) and two different plugins (Facet orientation and Ridge detection) [5-7]. We used the Facet Orientation plugin to derive surface orientation and statistics from the topograph  
  Programme 1120  
  Campaign  
  Address  
  Corporate Author Thesis Bachelor's thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 7905  
Permanent link to this record
 
 
Author Weimerskirch H., Chastel O., Ackermann L., Chaurand T., Cuenot Chaillet F., Hindermeyer X. & Judas J. openurl 
  Title (up) Alternate long and short foraging trips in pelagic seabird parents. Type Journal Article
  Year 1994 Publication Animal behaviour Abbreviated Journal  
  Volume 47 Issue Pages 472-476  
  Keywords  
  Abstract  
  Programme 109  
  Campaign  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0003-3472 ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 529  
Permanent link to this record
 
 
Author Weimerskirch, H.; Cherel, Y.; Cuenot-Chaillet, F.; Ridoux, V. doi  openurl
  Title (up) Alternative foraging strategies and resource allocation by male and female wandering albatrosses. Type Journal Article
  Year 1997 Publication Ecology Abbreviated Journal Ecology  
  Volume 78 Issue 7 Pages 2051-2063  
  Keywords  
  Abstract  
  Programme 109  
  Campaign  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0012-9658 ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number IPEV @ Thierry.Lemaire @ Serial 5562  
Permanent link to this record
 
 
Author Ceresa C. openurl 
  Title (up) Alternative foraging strategies of central-place foragers facing an environmental variability Type Master 2
  Year 2017 Publication Abbreviated Journal  
  Volume Issue Pages  
  Keywords  
  Abstract  
  Programme 137  
  Campaign  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 6898  
Permanent link to this record
 
 
Author Schmidt A., Handrich Y., Fahlman A., Woakes A.J. & P.J. Butler (2005). openurl 
  Title (up) Alternative thermoregulatory strategies in king penguins at sea: physiological adjustments and energetics in relation with sustained activity versus interbout resting Type Conference - International - Communication
  Year 2005 Publication Abbreviated Journal  
  Volume Issue Pages  
  Keywords  
  Abstract 2nd International Bio-logging Science Symposium St Andrews, Scotland, 13-16 juin 2005.  
  Programme 394  
  Campaign  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 5150  
Permanent link to this record
 
 
Author Fifi Ibrahime Adodo openurl 
  Title (up) Altimétrie et radiométrie en Antarctique Type Thesis
  Year 2018 Publication Abbreviated Journal  
  Volume Issue Pages  
  Keywords Altimétrie radar Antarctique Backscattering coefficent Calotte polaire Calottes glaciaires -- Antarctique Climat -- Changements Coefficients de rétrodiffusion Physique de la mesure Polar ice sheet Polarization ratio Radar altimeter Radiometer Radiométrie Ratio de polarisation de température de brillance Surface roughness Ugosité de surface  
  Abstract Dans le contexte actuel du réchauffement climatique, l'une des principales sources d'incertitude pour l'élévation du niveau de la mer est la contribution de la calotte Antarctique. L'étendue et les conditions météorologiques extrêmes de ce continent font de la télédétection spatiale un moyen utile pour son suivi sur le long terme. Les observations satellites altimétriques et radiométriques dans la gamme des micro-ondes rendent compte de l'évolution des propriétés du manteau neigeux de la calotte. L'altimétrie radar, par des mesures répétées de l'élévation de la topographie de surface, permet de quantifier les variations de volume sur l'ensemble du continent. Cependant, la pénétration de l'onde radar dans la neige affecte négativement cette quantification. Les méthodes proposées pour minimiser les erreurs de pénétration sont toutes basées sur des relations avec le coefficient de rétrodiffusion radar. La compréhension des variations annuelles et inter-annuelles du coefficient de rétrodiffusion est nécessaire pour améliorer la précision de l'estimation de l'élévation de la surface donc du bilan de volume de la calotte. Cette thèse a pour objectif d'étudier le coefficient de rétrodiffusion mesuré par les altimètres sur l'ensemble du continent, sujet qui jusqu'à aujourd'hui a reçu peu d'attention. Les altimètres radars embarqués à bord d'ENVISAT (bandes S et Ku) et de SARAL/AltiKa (bande Ka) ont des sensibilités différentes aux propriétés de la neige. Nous nous sommes intéressés aux caractéristiques annuelles et inter-annuelles des coefficients de rétrodiffusion dans ces trois bandes. Une étude de sensibilité a été réalisée avec un modèle électromagnétique afin de déterminer les propriétés du manteau neigeux qui dominent le signal saisonnier. On montre que le signal saisonnier est sensible à la densité et la rugosité de surface dans la bande S, à la température de la neige dans la bande Ka et à l'une ou à l'autre de ces variables selon la région dans la bande Ku. Les caractéristiques saisonnières du coefficient de rétrodiffusion sont ensuite comparées à celles des températures de brillance acquises par les radiomètres à bord de SARAL et de SSM/I. Les résultats indiquent une influence significative de la rugosité de surface sur les températures de brillance de la bande Ka, influence souvent considérée négligeable dans la modélisation de la température de brillance. Cette étude apporte une meilleure connaissance de la dynamique saisonnière des propriétés de proche surface de la calotte Antarctique. Elle fournit de nouveaux indices pour développer dans le futur des algorithmes robustes de correction de l'erreur de pénétration. Elle met également en lumière l'importance des missions altimétriques multi-fréquences et les possibilités qu'offrent le signal de la bande S pour l'étude des variabilités saisonnières de la rugosité de surface. En définitive, la rugosité de surface est un paramètre important à prendre en compte pour obtenir de meilleures estimations et modélisations des coefficients de rétrodiffusion et des températures de brillance.  
  Programme 1110  
  Campaign  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 7892  
Permanent link to this record
 
 
Author JOLY D., openurl 
  Title (up) Ambiances climatiques instantanées; application à la microclimatologie du Spitsberg Type Journal Article
  Year 2004 Publication Norois Abbreviated Journal  
  Volume 191 Issue Pages 43-58  
  Keywords  
  Abstract  
  Programme 304  
  Campaign  
  Address  
  Corporate Author Thesis Bachelor's thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0029-182X ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 4042  
Permanent link to this record
 
 
Author JOLY D., openurl 
  Title (up) Ambiances climatiques instantanées; application à la microclimatologie du Spitsberg ». Journées de la commission Type Conference - National - Article with Reading Comitee
  Year 2003 Publication Abbreviated Journal  
  Volume Issue Pages  
  Keywords  
  Abstract "Climat et société » du Comité National Français de Géographie, les 20-22 mars 2003, Rennes, 20 p.  
  Programme 304  
  Campaign  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 4060  
Permanent link to this record
 
 
Author Legovini, Paride file  openurl
  Title (up) Ambient seismic noise tomography of the Antarctic continent Type Thesis
  Year 2019 Publication [dissertation thesis], alma mater studiorum università di Bologna. dottorato di ricerca in geofisica Abbreviated Journal  
  Volume Issue Pages  
  Keywords  
  Abstract The lithosphere of Antarctica reacts to both the stress variations due to the dynamics of the mantle and the variation of the glacial load due to changes in climate. These two factors act on the dynamics of the glacial mass, on the evolution of the continent's topography and on the plate seismicity. This means that the knowledge of spatial variations in lithospheric thickness is needed to comprehend of the processes that involve interactions between climate and the geosphere. The main aim of this work is to produce a tomographic model of the continent. The classic data source for tomographic studies is a set of seismic signals produced by earthquakes. In this work I use a different technique: information is extracted by correlating the ambient seismic noise recorded in different locations. Instead of a the classic cross-correlation, this work uses the phase cross correlation technique, which appears to be more robust in our use case. Signal phases are used even to improve the correlogram stacks, by weighting the stack samples according to the correlograms' coherence. In Antarctica, the 30s Rayleigh wave group velocity map shows lower velocities in East Antarctica, and higher velocities in West Antarctica, coherently with expectations related to a thicker cratonic crust in the East, and thinner extending crust in the West. Deeper sensitivity of longer periods make the color pattern switch for the 80s map, sensing the upper mantle and consequently higher velocity at the cold roots of cratonic East Antarctica and lower velocity in the tectonically active West. I also contributed to the maintenance and development of the seismic observational infrastructure in Antarctica. This thesis recaps the activities I carried out during my participation to the 31st campaign of the Italian National Antarctic Research Program, to which I participated during the PhD course.  
  Programme 133  
  Campaign  
  Address  
  Corporate Author Thesis Bachelor's thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 7283  
Permanent link to this record
Select All    Deselect All [51–60] << 61 62 63 64 65 66 67 68 69 70 >> [71–80]
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