| Records |
| Author |
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| Title |
Dome C coherence time statistics from DIMM data |
Type |
Journal |
| Year |
2020 |
Publication |
Monthly Notices of the Royal Astronomical Society |
Abbreviated Journal |
|
| Volume |
496 |
Issue |
4 |
Pages |
4822-4826 |
| Keywords |
Astrophysics – Instrumentation and Methods for Astrophysics |
| Abstract |
We present a reanalysis of several years of DIMM data at the site of Dome C, Antarctica, to provide measurements of the coherence time $\tau0$. Statistics and seasonal behaviour of $\tau0$ are given at two heights above the ground, 3m and 8m, for the wavelength $\lambda=500$nm. We found an annual median value of $2.9$ms at the height of 8m. A few measurements could also be obtained at the height of 20m and give a median value of 6ms during the period June--September. For the first time, we provide measurements of $\tau0$ in daytime during the summer, which appears to show the same time dependence as the seeing with a sharp maximum at 5pm local time. Exceptional values of $\tau0$ above 10ms are met at this particular moment. The continuous slow variations of turbulence conditions during the day offers a natural test bed for a solar adaptive optics system. |
| Programme |
1066 |
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Edition |
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| ISSN |
0035-8711, 1365-2966 |
ISBN  |
0035-8711, 1365-2966 |
Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
7825 |
| Permanent link to this record |
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| Author |
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| Title |
Transiting planet candidates with ASTEP 400 at Dome C, Antarctica |
Type |
Journal |
| Year |
2016 |
Publication |
Monthly Notices of the Royal Astronomical Society |
Abbreviated Journal |
|
| Volume |
463 |
Issue |
1 |
Pages |
45-62 |
| Keywords |
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| Abstract |
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| Programme |
1066 |
| Campaign |
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Edition |
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| ISSN |
0035-8711 |
ISBN |
0035-8711 |
Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
8070 |
| Permanent link to this record |
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| Author |
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| Title |
Stratospheric aerosol data records for the climate change initiative: Development, validation and application to chemistry-climate modelling |
Type |
Journal |
| Year |
2017 |
Publication |
Remote Sensing of Environment |
Abbreviated Journal |
|
| Volume |
203 |
Issue |
|
Pages |
296-321 |
| Keywords |
Aerosol burden Aerosol remote sensing Climate data record Climate modelling ENVISAT GOMOS Lidar Stratospheric aerosol extinction Volcanic eruptions |
| Abstract |
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| Programme |
209 |
| Campaign |
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| Address |
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| Corporate Author |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0034-4257 |
ISBN |
0034-4257 |
Medium |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
6753 |
| Permanent link to this record |
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| Author |
M. Leduc-Leballeur, G. Picard, G. Macelloni, L. Arnaud, M. Brogioni, A. Mialon, Y. H. Kerr |
| Title |
Influence of snow surface properties on L-band brightness temperature at Dome C, Antarctica |
Type |
Journal |
| Year |
2017 |
Publication |
Remote Sensing of Environment |
Abbreviated Journal |
|
| Volume |
199 |
Issue |
|
Pages |
427-436 |
| Keywords |
Cryosphere Microwave SMOS Snow emission modeling |
| Abstract |
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| Programme |
1110 |
| Campaign |
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| Address |
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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 |
0034-4257 |
ISBN |
0034-4257 |
Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
6774 |
| Permanent link to this record |
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| Author |
Giovanni Macelloni, Marion Leduc-Leballeur, Francesco Montomoli, Marco Brogioni, Catherine Ritz, Ghislain Picard |
| Title |
On the retrieval of internal temperature of Antarctica Ice Sheet by using SMOS observations |
Type |
Journal |
| Year |
2019 |
Publication |
Remote Sensing of Environment |
Abbreviated Journal |
|
| Volume |
233 |
Issue |
|
Pages |
111405 |
| Keywords |
Cryosphere L band Snow/ice microwave emission model |
| Abstract |
Internal temperature is an essential parameter for understanding ice sheet dynamics. Glaciological models provide estimations of temperature profiles over Antarctica and few boreholes are also available, but, at present, no measurement exists at the scale of the whole continent. The analysis of passive L-band observations from the Soil Moisture and Ocean Salinity (SMOS) satellite shows that, thanks to the high penetration depth (i.e. up to 1500?m), it is possible to infer information on in depth glaciological properties of the ice sheet including temperature. In this study, the temperature profile is retrieved from SMOS observations using jointly glaciological and emission models. The developed methodology is valid in the inner part of Antarctica where the ice sheet is almost stable (i.e. its velocity is limited to 10?m?yr?1). This analysis points out that in several cases, differences are observed between retrieved temperature profiles and those predicted by glaciological models. In particular, some geophysical parameters, namely the geothermal heat flux and the mean annual accumulation, need to be modified with respect to their prior values in order to simulate SMOS brightness temperatures. Results also clearly show that the reliability of the retrieved profile in depth decreases with increasing ice thickness due to the limited penetration of microwaves in the ice. The obtained results prove the capability of L band (1.4?GHz) passive microwave sensors for investigating the internal temperature of the ice-sheet. |
| Programme |
1110 |
| Campaign |
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| Address |
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Series Issue |
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Edition |
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| ISSN |
0034-4257 |
ISBN |
0034-4257 |
Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
6977 |
| Permanent link to this record |
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| Author |
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| Title |
Analysis of Exposure to Solar and Galactic Cosmic Radiations of Flights Representative of the European International Air Traffic |
Type |
Journal |
| Year |
2018 |
Publication |
Radiation Research |
Abbreviated Journal |
|
| Volume |
190 |
Issue |
3 |
Pages |
271-281 |
| Keywords |
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| Abstract |
This study analyzed the impact of galactic and solar cosmic rays on ambient dose equivalent during airline travel. A high statistic of flights are considered, which is representative of European international air traffic. Flight paths are based on the Eurocontrol Demand Data Repository and consider realistic flight plans with and without regulations or updated with radar data from the Central Flow Management Unit. Ambient dose equivalent during flights was investigated during quiet solar periods and extreme solar flare events. Thus, the statistical analyses presented here take into account route characteristics (departure, arrival, continent, etc.) and space weather conditions. The findings of this work show the important influence of flight path, particularly the latitude, which drives the cutoff rigidity variations. Moreover, dose values vary drastically during ground level enhancement events, with the route path (latitude, longitude and altitude) and the phasing of the solar event. This study highlights the importance of monitoring these solar events and developing a physical approach to obtain reliable assessment of ambient dose equivalents. |
| Programme |
1112 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
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Place of Publication |
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Editor |
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Summary Language |
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Original Title |
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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 |
0033-7587, 1938-5404 |
ISBN |
0033-7587, 1938-5404 |
Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
7040 |
| Permanent link to this record |
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| |
| Author |
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| Title |
Atmospheric Cosmic-Ray Variation and Ambient Dose Equivalent Assessments Considering Ground Level Enhancement Thanks to Coupled Anisotropic Solar Cosmic Ray and Extensive Air Shower Modeling |
Type |
Journal |
| Year |
2017 |
Publication |
Radiation Research |
Abbreviated Journal |
|
| Volume |
188 |
Issue |
5 |
Pages |
597-611 |
| Keywords |
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| Abstract |
This work investigates the impact of Forbush decrease (FD) and ground-level enhancement (GLE) in the atmosphere, based on solar and galactic cosmic-ray models and the extensive air shower simulations. This approach gives the possibility to investigate both the dynamic behavior of neutron monitors (NM) (using response function) and the flight dose. The ambient dose equivalent during quiet solar activity and solar events (i.e., FDs and GLEs) were investigated for realistic flight plans issued from the Eurocontrol Demand Data Repository. The calculated ambient dose equivalents were compared with flight measurements in quiet solar conditions; comparisons are relevant and demonstrate the ability to estimate the dose level. The GLE model was validated for the GLEs 5 and 69 using the cosmic-ray variation recorded by NMs. The GLE model was applied to flight dose calculations. All of these results show that dose values vary drastically with the route path (latitude, longitude and altitude) and with the delay between the flight departure and the solar event occurrence. Doses induced by extreme GLE events were investigated specifically for London to New York flights, and resulting additional doses are a few hundred or 1,000 ?Sv, impacting significantly the annual effective dose. This highlights the importance of monitoring extreme solar events and using realistic semi-empirical and particle transport methods for reliable calculation of dose levels. |
| Programme |
1112 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
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| Publisher |
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Place of Publication |
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Editor |
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| Language |
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Summary Language |
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Original Title |
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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 |
0033-7587 |
ISBN |
0033-7587 |
Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
6725 |
| Permanent link to this record |
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| |
| Author |
Dmitry Krasnoshchekov, Petr Kaazik, Elena Kozlovskaya, Vladimir Ovtchinnikov |
| Title |
|
Type |
Journal |
| Year |
2016 |
Publication |
Pure and Applied Geophysics |
Abbreviated Journal |
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| Volume |
173 |
Issue |
5 |
Pages |
1575-1591 |
| Keywords |
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| Abstract |
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| Programme |
133 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
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Place of Publication |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0033-4553, 1420-9136 |
ISBN |
0033-4553, 1420-9136 |
Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
6772 |
| Permanent link to this record |
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| Author |
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| Title |
A healthy, premoult adult king penguin (Aptenodytes patagonicus) with a markedly twisted beak |
Type |
Journal |
| Year |
2017 |
Publication |
Polar Record |
Abbreviated Journal |
|
| Volume |
53 |
Issue |
6 |
Pages |
631-632 |
| Keywords |
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| Abstract |
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| Programme |
394 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
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Place of Publication |
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Editor |
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Summary Language |
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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 |
0032-2474, 1475-3057 |
ISBN |
0032-2474, 1475-3057 |
Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
6853 |
| Permanent link to this record |
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| |
| Author |
Alexandra Lavrillier |
| Title |
Climate change among nomadic and settled Tungus of Siberia: continuity and changes in economic and ritual relationships with the natural environment |
Type |
Journal |
| Year |
2013 |
Publication |
Polar Record |
Abbreviated Journal |
|
| Volume |
49 |
Issue |
3 |
Pages |
260-271 |
| Keywords |
|
| Abstract |
Living in close relationship with the Siberian environment, for several decades the Tungus (Evenk and Even peoples) have been noticing numerous changes in climate, flora and fauna. Based on fieldwork among reindeer herders, hunters and fishermen in Yakutia, the Amur region and Kamchatka, this paper explores how climate change is perceived, and how it causes economic, social and ritual changes. It questions the modifications of the economic and religious human-environment relationships through various aspects. It analyses the indigenous perception of a link between the environment and identity and the indigenous notion of adaptation and vulnerability. It also compares their adaptive strategies that either use old techniques, or trigger mutations. In this context, the notion of reciprocity seems to be disappearing and a new notion of time-space in managing the environment is appearing. This paper analyses the religious changes, such as the creation of new rituals and millenarian narratives or the rebirth of shamanistic legends. |
| Programme |
1127 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
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| Publisher |
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Place of Publication |
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Editor |
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| Language |
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Summary Language |
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Original Title |
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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 |
0032-2474, 1475-3057 |
ISBN |
0032-2474, 1475-3057 |
Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
6976 |
| Permanent link to this record |
