GRISELIN M. et ORMAUX S.,. (2005). Pour une approche paysagère des espaces polaires, l’exemple du Spitsberg occidental. Norois, 194, 109–123.
Abstract: L'article suivant aborde les paysages polaires à travers la production récente d'un cédérom consacré à l'analyse de paysages depuis le sol en milieu arctique. Après avoir rappelé brièvement l'ambiguïté des relations entre géographie et paysage, on évoque l'évolution des représentations des paysages et des zones polaires chez nos contemporains, avant de montrer comment les nouveaux médias autorisent une approche renouvelée des paysages. Le céderont, sur lequel on focalise progressivement le propos, sert de fil conducteur à cette réflexion sur le paysage polaire, considéré tout à la fois comme objet d'étude et comme espace expérimental.
Programme: 304
|
RICAUD Philippe, GABARD Benjamin, DERRIEN Sol, CHABOUREAU Jean-Pierre, ROSE Thomas, MOMBAUER Andreas, CZEKALA Harald,. (2010). HAMSTRAD-Tropo, A 183-GHz Radiometer Dedicated to Sound Tropospheric Water Vapor Over Concordia Station, Antarctica. IEEE transactions on geoscience and remote sensing, 48(3), 16.
Abstract: The H[2]O Antarctica Microwave Stratospheric and Tropospheric Radiometers (HAMSTRAD) program aims to develop two ground-based microwave radiometers to sound tropospheric and stratospheric water vapor (H[2]O) above Dome C (Concordia Station), Antarctica (75°06'S, 123°21'E, 3233 m asml), an extremely cold and dry environment, over decades. By using state-of-the-art technology, the HAMSTRAD-Tropo radiometer uses spectral information in the domains 51-59 GHz (oxygen line) and 169-197 GHz (water vapor line) to derive accurate tropospheric profiles of temperature (with accuracy ranging from 1 to 2 K) and low absolute humidity (with accuracy ranging from 0.02 to 0.05 g · m[-3]), together with integrated water vapor (with accuracy of about 0.008 kg · m[-2]) and liquid water path. Prior to its installation at Dome C in January 2009, the fully automated radiometer has been deployed at the Pic du Midi (PdM, 42°56'N, 0°08'E, 2877 m asml, France) in February 2008 and was in operation for five months. Preliminary comparisons with radio soundings particularly launched in the vicinity of PdM in February 2008 and the outputs from the mesoscale MESO-NH model show a great consistency to within 0.2-0.3 g · m[-3] between all absolute humidity data sets whatever the atmosphere considered (extremely dry or wet).
Keywords: Atmospheric measurements, humidity measurement, microwave measurements, microwave radiometry, Europe, Europe, Western Europe, Europe Ouest, polar regions, R, France, France, Antarctica, Antarctique, radiometry, Radiom, atmosphere, Atmosph, models, Mod, sounding, Sondage, humidity, Humidit, accuracy, Pr, temperature, Temp, oxygen, Oxyg, technology, Technologie, domes, Dome, programs, Programme, microwaves, Hyperfr, water vapor, Vapeur eau,
Programme: 910
|
|
Joliet F. (2011). Umiujaq, regards inuit sur le paysage. Bachelor's thesis, Presses de l'UQAM, Montréal.
|
Schwarzenboeck, A.; Duroure, C.; Gayet, J.-F.; Herber, A.; Krecji, R.; Lefevre, R.; Minikin, A.; Neuber, R.; Shcherbakov, V.; Strm, J.; Yamagata, S.; Yamanouchi, T. (2004). Aerosol-Cloud Interaction during the Transition Time Period of Arctic Haze to Clean Summer Conditions. European Aerosol Conference 2004, 35. Budapest, (H).
Keywords: arctic aerosol; aerosol-cloud interaction; arctic mixed phase clouds; indirect aerosol effect
Programme: 430
|
Mengesha S., Dehairs F., Fiala M., Elskens M. & Goeyens L. (1998). Seasonal variation of phytoplankton community structure and nitrogen uptake regime in the Indian sector of the southern ocean. Polar Biol., 20(4), 259–272.
Abstract: This study investigates the dynamics of phytoplankton communities and nitrogen uptake in the Indian sector of the Southern Ocean during spring and summer. The study area is oligotrophic (Chl a stocks < 50 mg m-2); nevertheless, a large spatial variation of phytoplankton biomass and community structure was observed. During both seasons the phytoplankton community in the seasonal ice zone showed higher biomasses and was mainly composed of large diatom cells. However, in the permanently open ocean zone the community had low biomass and was chiefly composed of nano- and picoflagellates. In the polar front zone, although biomass was higher, the community structure was similar to the open ocean zone. The results suggest that the variation in phytoplankton community structure on a larger scale resonates with gradients in water column stability and nutrient distribution. However, significant changes in biomass and nutrient stocks but little change in community structure were observed. Absolute nitrogen uptake rates were generally low, but their seasonal variations were highly significant. During spring the communities displayed high specific nitrate uptake (mean rate = 0.0048 h-1). and diatoms (in the seasonal ice zone) as well as nano- and picoflagellates (in the permanently open ocean zone and polar front zone) were mainly based on new production (mean f-ratio = 0.69). The transition to summer was accompanied by a significant reduction in nitrate uptake rate (0.0048 h-1 ? 0.0011 h-1) and a shift from predominantly new to regenerated production (f-ratio 0.69 ? 0.39). Ammonium played a major role in the seasonal dynamics of phytoplankton nutrition. The results emphasize that, despite a large contrast in community structure, the seasonal dynamics of the nitrogen uptake regime and phytoplankton community structure in all three subsystems were similar. Additionally, this study supports our previous conclusion that the seasonal shift in nitrogen uptake regime can occur with, as well as without, marked changes in community structure.
Keywords: Seasonal variation ; Phytoplankton ; Biomass ; Plant community ; Nitrogen cycle ; Absorption ; Southern Ocean ; Indian Ocean ; Algae ; Community structure ; Marine environment ; Thallophyta
Programme: 193
|
Danesi S., M. Dubbini, A. Morelli and L. Vittuari. (2008). Joint geophysical observations of ice stream dynamics (A. Capra and R. Dietrich Eds., Ed.). Bachelor's thesis, Springer-Verlag Berlin Publ., Berlin.
Abstract: Contribution
to ‘Geodetic and Geophysical Observatories in Polar Regions –
Overview in the IPY Perspective’, Springer-Verlag Berlin Publ., A.
Capra and R. Dietrich Eds.,
Programme: 906
|
|
Van De Vijver B., Denys L. & Beyens L. (2000). Fragilaria husvikensis sp. nov. (Bacillariophyceae), another Fragilaria species with transapical ribs from Subantarctica. Nova Hedwigia, , 537–550.
|
|
Dubois J. (1997). Recherche des effets métaboliques des hormones thyroïdiennes chez deux espèces de manchots antarctiques(Pygoscelis adeliae et Ap.). Bachelor's thesis, , .
|
Angelier J. & Bergerat F. (1997). The South Iceland Seismic zone – Part II: Stress fields and mecanisms of seismogenic faults..
Abstract: Abstr., Workshop Prenlab – 1, 24-25 octobre Paris
Programme: 316
|
|
Guinard E., Weimreskirch H. & Jouventin P. (1998). Population changes and demography of the northern rockhopper penguin on Amsterdam and Saint Paul islands. Colonial waterbirds, 21(2), 222–228.
|
