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Author |
Ricaud, P. Gabard, B. Derrien, S. Attie, J.-L. Rose, T. Czekala, H. |
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Title |
Validation of tropospheric water vapor as measured by the 183-GHz HAMSTRAD Radiometer over the Pyrenees Mountains, France |
Type |
Journal Article |
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Year |
2010 |
Publication |
IEEE Geoscience and Remote Sensing Society |
Abbreviated Journal |
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Volume |
48 |
Issue |
5 |
Pages |
2189-2203 |
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Abstract |
The H2O Antarctica Microwave Stratospheric and Tropospheric Radiometers (HAMSTRAD) 183-GHz radiometer has been developed to measure vertical profiles of tropospheric water vapor above Dome C (Concordia station), Antarctica ( 75?06'S, 123?21'E, 3233 m asml), which is an extremely cold and dry environment, over decades. Prior to its installation at Dome C in January 2009, the instrument was deployed at the Pic du Midi (PdM) station ( 42?56'N, 0?08'E, 2877 m asml) in the Pyrenees Mountains, France, over the period covering February-June 2008. Vertical profiles of absolute humidity and integrated water vapor (IWV) as measured by HAMSTRAD were compared with measurements from radiosondes launched in three different sites: Lannemezan (43?07'N, 0?23'E, 610 m asml), France (~30 km northeast from PdM), Bordeaux-Me?rignac Airport (44?49'N, 0?42'W, 50 m asml), France ( ~ 220 km northwest from PdM), and Zaragoza (41?39'N, 0?53'W, 263 m asml), Spain ( ~170 km southwest from PdM). The validation process also used the vertical profiles of tropospheric H2O as measured by the nadir-viewing infrared atmospheric sounding interferometer (IASI) instrument aboard the MetOp-A space platform. The temporal evolution of the HAMSTRAD H2O measurements above the PdM station is very consistent with IASI, sonde, and in situ measurements, tracking the same atmosphere from a dry period in February to a wet period in June. HAMSTRAD showed unrealistic values in periods of well-established snow tempest. While the sensitivity of the HAMSTRAD measurements tends to be degraded 6 km above the altitude of the instrument, namely, above 8877 m asml, the HAMSTRAD measurements seem reasonable at the uppermost retrieval level (namely, 10 km, 12 877 m asml). In May, the wet periods are systematically showing a good agreement between sonde and HAMSTRAD IWV fields and H2O below 6777 m asml but a dry bias of IASI by more than 4-kg m-2 IWV, where- – as outside of these periods, the three data sets behave consistently. Since the best results (mean, standard deviation, bias, and correlation) are obtained when the HAMSTRAD radiometer operates in the very dry conditions of February, namely, in dryness conditions comparable to Dome C summertime values, we are very confident in the optimal use of the instrument when deployed in Antarctica. |
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910 |
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Bachelor's thesis |
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ISSN |
0196-2892 |
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yes |
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52 |
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Author |
Groscolas R, Viera V, Guerin N, Handrich Y, Côté S D, |
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Title |
Heart rate as a predictor of energy expenditure in undisturbed fasting and incubating penguins.
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Type |
Journal Article |
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Year |
2010 |
Publication |
The Journal of experimental biology |
Abbreviated Journal |
J. Exp. Biol. |
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Volume |
213 |
Issue |
1 |
Pages |
153 -60 |
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Keywords |
Animals, Energy Metabolism, Fasting, Fasting: physiology, Female, Heart Rate, Male, Nesting Behavior, Nesting Behavior: physiology, Spheniscidae, Spheniscidae: physiology, |
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Abstract |
Heart rate (f(H)) measurement offers the possibility to monitor energy expenditure (EE) in wild animals if the EE/f(H) relationship for the species, physiological stages and activities of interest is known. This relationship has been extensively studied using oxygen consumption rate ( ) measurement in captive, repeatedly handled king penguins (Aptenodytes patagonicus). Unfortunately, the potential effects of stress on the observed relationships resulting from handling and confinement were not considered. This study is the first involving undisturbed animals, and determines the EE/f(H) relationship in naturally fasting and freely incubating or captivity-acclimatized male and female king penguins. EE determination was based on (1) the measurement of body mass loss during periods of phase II fasting, and (2) the calculation of its energy equivalent from changes in body composition, i.e. 23.9 kJ g(-1). f(H) levels in freely incubating and captivity-acclimatized birds were found to be 50-70% lower than those previously reported for resting king penguins during measurements. Significant EE/f(H) relationships were found in freely incubating and captive males and females (R(2)=0.59 to 0.84), with no difference observed between genders. The best overall relationship was obtained by including fasting duration (t, days) in the model: EE=818+43.7xf(H)+36.3t-1.4txf(H) (R(2)=0.91). This equation yielded EE estimates approximately 26% higher than the previously reported 'best' predictive equation in king penguins, and even more so when f(H) was low. This result suggests that stress induces a disproportionate increase of f(H) vs O(2) consumption, and that the use of EE/f(H) relationships obtained in stressed birds could lead to underestimated EE values.
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119;394 |
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Bachelor's thesis |
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ISSN |
0022-0949 |
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yes |
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Serial |
71 |
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Author |
Lévêque Jean-Jacques, Maggi Alessia, Souriau Annie, |
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Title |
Seismological constraints on ice properties at Dome C, Antarctica, from horizontal to vertical spectral ratios
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Type |
Journal Article |
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Year |
2010 |
Publication |
Antarctic Science |
Abbreviated Journal |
Antarct. Sci. |
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Volume |
22 |
Issue |
05 |
Pages |
572 -579 |
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Keywords |
Antarctic seismological stations, Concordia, firn, seismic ambient noise, |
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Abstract |
The French-Italian Concordia (CCD) seismological station at Dome C is one of two observatories setup on the ice cap in the interior of the Antarctic continent. We analysed the seismic signal due to ambient noise at this station and at three temporary stations 5 km away from Concordia, in order to specify the ice properties beneath them. A method based on the horizontal to vertical (H/V) spectral ratio, commonly used to analyse soil response in seismic regions, was applied to the Antarctic stations. The main peak in the spectral ratios is observed at frequencies 6.7–8 Hz at the Dome C stations, but it is not observed at another station on the ice cap, QSPA, where the sensor is buried at 275 m depth. This peak can be explained by a 23 m thick unconsolidated snow or firn layer with a low S-wave velocity of 0.7 km s-1, overlying a consolidated layer with S-wave velocity 1.8 km s-1. Despite the non-uniqueness of the solutions obtained by fitting the H/V spectra, this model is preferred because the depth of the velocity contrast coincides with the density at which ice particles arrange themselves in a continuous, dense lattice. A small variability of this structure is observed around Dome C. |
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Programme |
133;906 |
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Bachelor's thesis |
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ISSN |
0954-1020 |
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yes |
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Serial |
89 |
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Author |
JJ. Leveque, A. Maggi, A. Souriau, G. Wittlinger |
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Title |
CASE-IPY: autonomous seismic stations newly deployed on the East Antarctic Plateau. |
Type |
Conference - International - Poster |
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Year |
2010 |
Publication |
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Abstract |
EGU General Assembly, Vienna, 2010 |
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Programme |
906 |
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Bachelor's thesis |
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yes |
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Serial |
91 |
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Author |
Koubbi Philippe, Ozouf-Costaz Catherine, Goarant Anne, Moteki Masato, Hulley Percy-Alexander, Causse Romain, Dettai Agns, Duhamel Guy, Pruvost Patrice, Tavernier Eric, Post Alexandra L, Beaman Robin J, Rintoul Stephen R, Hirawake Toru, Hirano Daisuke, Ishimaru Takashi, Riddle Martin, Hosie Graham, |
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Title |
Estimating the biodiversity of the East Antarctic shelf and oceanic zone for ecoregionalisation: Example of the ichthyofauna of the CEAMARC (Collaborative East Antarctic Marine Census) CAML surveys
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Type |
Journal Article |
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Year |
2010 |
Publication |
Polar Science |
Abbreviated Journal |
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Volume |
4 |
Issue |
2 |
Pages |
115 -133 |
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Keywords |
East Antarctic shelf, Ichthyofauna, Ecoregionalisation, Generalized dissimilarity modeling, Dumont d'Urville Sea, |
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Abstract |
Ecoregions are defined in terms of community structure as a function of abiotic or even anthropogenic forcing. They are meso-scale structures defined as the potential habitat of a species or the predicted communities geographic extent. We assume that they can be more easily defined for long-lived species, such as benthos or neritic fish, in the marine environment. Uncertainties exist for the pelagic realm because of its higher variability, plus little is known about the meso- and bathypelagic zones. A changing environment and modification of habitats will probably drive new communities from plankton to fish or top predators. We need baseline studies, such as those of the Census of Antarctic Marine Life, and databases like SCAR-MarBIN as tools for integrating all of these observations. Our objective is to understand the biodiversity patterns in the Southern Ocean and how these might change through time. |
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1124;1142 |
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Bachelor's thesis |
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ISSN |
1873-9652 |
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yes |
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123 |
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Author |
GRISELIN M., MARLIN Ch., LAFFLY D., BERNARD E., DELANGLE E., FRIEDT J-M., SCHWAMBORN G. et TOLLE F. |
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Title |
Austre Lovén Glacier variation in surface and volume (1964-2008) through remote sensing, DEM, maps and field measurements during the IPY program Hydro-Sensor-FLOWS |
Type |
Book Chapter |
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Year |
2010 |
Publication |
Canadian journal of remote sensing |
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304 |
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Bachelor's thesis |
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1712-7971 |
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134 |
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Author |
Spée Marion, Marchal Lorène, Thierry Anne-Mathilde, Chastel Olivier, Enstipp Manfred, Maho Yvon Le, Beaulieu Michaël, Raclot Thierry, |
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Title |
Exogenous corticosterone mimics a late fasting stage in captive Adélie penguins (Pygoscelis adeliae)
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Journal Article |
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Year |
2011 |
Publication |
American Journal of Physiology – Regulatory, Integrative and Comparative Physiology |
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Volume |
300 |
Issue |
5 |
Pages |
R1241 -R1249 |
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137 |
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Bachelor's thesis |
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1522-1490 |
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yes |
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180 |
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Author |
Ricaud, P., S. Derrien, J.-P. Chaboureau, J.-L. Attié, T. Rose, H. Czekala, C. Genthon, L. Genoni, A. Pellegrini and G. Durand |
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Title |
The 183-GHz radiometer HAMSTRAD: Validation over the Pyrenees mountains (France) and first measurements at Dome C (Antarctica) |
Type |
Conference - International - Article without Reading Comitee |
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Year |
2010 |
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Conférence CONCORDIASI, Toulouse, March 2010. |
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Programme |
910 |
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Bachelor's thesis |
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yes |
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Serial |
223 |
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Author |
P. Ricaud, J.-L. Attié, T. Rose, C. Genthon, L. Genoni, A. Pellegrini and G. Durand |
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Title |
THE GROUND-BASED MICROWAVE RADIOMETER HAMSTRAD: FIRST MEASUREMENTS OF TEMPERATURE AND HUMIDITY IN THE PBL AT DOME C (ANTARCTICA) |
Type |
Conference - International - Communication |
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Year |
2010 |
Publication |
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Volume |
XXXI SCAR Meeting, Buenos Aires, |
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Pages |
Argentina, 2-6 August 2010. |
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Programme |
910 |
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Bachelor's thesis |
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yes |
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230 |
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Author |
Larose Catherine, Berger Sibel, Ferrari Christophe, Navarro Elisabeth, Dommergue Aurélien, Schneider Dominique, Vogel Timothy, |
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Title |
Microbial sequences retrieved from environmental samples from seasonal Arctic snow and meltwater from Svalbard, Norway
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Type |
Journal Article |
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Year |
2010 |
Publication |
Extremophiles |
Abbreviated Journal |
Geochim. Cosmochim. Acta |
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Volume |
14 |
Issue |
2 |
Pages |
205-212 -212 |
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Keywords |
Biomedical and Life Sciences, |
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Abstract |
16S rRNA gene (rrs) clone libraries were constructed from two snow samples (May 11, 2007 and June 7, 2007) and two meltwater samples collected during the spring of 2007 in Svalbard, Norway (79°N). The libraries covered 19 different microbial classes, including Betaproteobacteria (21.3%), Sphingobacteria (16.4%), Flavobacteria (9.0%), Acidobacteria (7.7%) and Alphaproteobacteria (6.5%). Significant differences were detected between the two sets of sample libraries. First, the meltwater libraries had the highest community richness (Chao1: 103.2 and 152.2) and Shannon biodiversity indices (between 3.38 and 3.59), when compared with the snow libraries (Chao1: 14.8 and 59.7; Shannon index: 1.93 and 3.01). Second, -LIBSHUFF analyses determined that the bacterial communities in the snow libraries were significantly different from those of the meltwater libraries. Despite these differences, our data also support the theory that a common core group of microbial populations exist within a variety of cryohabitats.
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399 |
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Bachelor's thesis |
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Springer Japan |
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1431-0651 |
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yes |
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253 |
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