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Author |
Ambroise Dufour |
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Title |
Statistics of Precipitations on the Antarctic Plateau |
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Report |
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2012 |
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Paris school of mines engineer thesis report
Abstract: Precipitation in the interior of the Antarctic continent plays a crucial role in the mass balance of the ice-sheet. Nevertheless, few observations have been made to quantify the snowfall and it is not clear how accurately the phenomenon is reproduced by climate models. For these reasons, a disdrometer (VPF-730, Biral) was set up on the Antarctic Plateau in 2009 at the French-Italian station Concordia. The observations were compared to a limited area model and a meteorological reanalysis. To account for the important di erences between observations and models, a cluster analysis was performed on the disdrometer data. This method allowed to separate artefacts from actual snow events and to distinguish snow events among themselves. If the artefacts are excluded from the dataset, the agreement with the models is improved, at least in terms of the timing of events. A recalibration for speci c snow types could potentially yield information on the magnitude of the events as well.
Can be downloaded at http://www-lgge.obs.ujf-grenoble.fr/~christo/calva/reports/Rapport_AmbroiseDufour.pdf |
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4203 |
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H. Gallée and C. genthon |
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Evaluation of uncertainties on the surface mass balance (SMB) of Antarctica and related contribution to sea-level. A contribution of WP2.4 to WP6 |
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2012 |
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IC2SEA report
Available at http://www-lgge.obs.ujf-grenoble.fr/~christo/calva/reports/Evaluation-smbGalleeGenthonIce2sea.pdf |
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1013 |
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4204 |
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Ricaud, P., F. Carminati, B. Plazolles, Y. Courcoux, C. Genthon, A. Pellegrini, J.-L. Attie, L. El Amraoui, T. August, J. Warner |
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Variabilities of temperature and water vapour above Dome C (Antarctica) from the lowermost troposphere to the lowermost stratosphere |
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Conference - International - Communication |
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2012 |
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SCAR 2012, 13-25 Juillet, Portland, USA |
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1013 |
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4273 |
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Palerme, C., C. Genthon, N. Champollion; G. Picard, C. Claud |
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Title |
Antarctic precipitation and climate change |
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Conference - International - Communication |
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2012 |
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SCAR 2012, 13-25 Juillet, Portland, USA. |
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1013 |
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4281 |
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Brun, C., H. Barral, S. Blein, C. Genthon |
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Title |
turbulence anisotropy in katabatic flows, from alpine slopes to antarctic plateau |
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Conference - International - Communication |
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2011 |
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EGU 2014, Vienne, Autriche, Avril 2014. |
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1013 |
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1653 |
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Author |
Genthon Christophe, Six Delphine, Gallée Hubert, Grigioni Paolo, Pellegrini Andrea, |
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Title |
Two years of atmospheric boundary layer observations on a 45-m tower at Dome C on the Antarctic plateau
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Journal Article |
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2013 |
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JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
Abbreviated Journal |
J. Geophys. Res. |
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118 |
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8 |
Pages |
3218-3232 |
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Keywords |
3307 Boundary layer processes, 3329 Mesoscale meteorology, 3349 Polar meteorology, 3394 Instruments and techniques, 9310 Antarctica, Antarctica, Boundary layer processes, Mesoscale meteorology, Polar meteorology, |
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The lower atmospheric boundary layer at Dome C on the Antarctic plateau has been continuously monitored along a 45-m tower since 2009. Two years of observations (2009 and 2010) are presented. A strong diurnal cycle is observed near the surface in summer but almost disappears at the top of the tower, indicating that the summer nocturnal inversion is very shallow. Very steep inversions reaching almost 1°C m-1 on average along the tower are observed in winter. They are stronger and more frequent during the colder 2010 winter, reaching a maximum in a layer ~10-15 m above the surface. Winter temperature is characterized by strong synoptic variability. An extreme warm event occurred in July 2009. The temperature reached -30°C, typical of mid-summer weather. Meteorological analyses which agree with the observations near the surface confirm that heat is propagated downward from higher elevations. A high total water column indicates moist air masses aloft originating from the lower latitudes. The coldest temperatures and strongest inversions are associated with characteristic synoptic patterns and a particularly dry atmosphere. Measurement of moisture in the clean and cold Antarctic plateau atmosphere is a challenging task. Supersaturations are very likely but are not revealed by the observations. This is possibly an instrumental artifact that would affect other moisture measurements made in similar conditions. In spite of this, such observations offer a stringent test of the robustness of the polar boundary layer in meteorological and climate models, addressing a major concern raised in the IPCC 2007 report. |
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2169-8996 |
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4488 |
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Author |
Naaim, F., H. Bellot, K. Nishimura, C. Genthon, C. Palerme, et G. Guyomarc'h |
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Title |
How to detect snow fall occurrence during blowing snow event? |
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Conference - International - Article without Reading Comitee |
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2013 |
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Proceedings de l'International Snow Science Workshop, Université d'Anchorage, 976-982 |
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1013 |
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4490 |
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Jaime E. G., J. Thomas, R. von Glasgow, S. Bekki, Al. Kukui, M. Frey, B. Jourdain, M. Kerbrat, C. Genthon, S. Preuknert, and M. Legrand |
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Title |
1D Chemical Modeling of coupled snow-atmosphere chemistry at Dome C Antarctica |
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Conference - International - Communication |
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2013 |
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EGU2013, Avril 2013, Vienne, Autriche. |
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1013 |
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4491 |
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Barral H., C. genthon, D. Six, H. Gallée, C. brun |
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The atmospheric boundary layer at Dome C on the Antarctic plateau |
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Conference - International - Communication |
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2013 |
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EGU2013, Avril 2013, Vienne, Autriche. |
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4492 |
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Palerme C., C. Genthon, J. Kay, F. Naiim, C. Amory |
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Title |
Detecting precipitation events in Antarctica by space radar nd in situ measurements |
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Conference - International - Communication |
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2013 |
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DACA 2013, 8-12 Juillet 2013, Davos, Suisse. |
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4493 |
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