| Records |
| Author |
S. Merouane, S. Günther, O. Chitarra, O. Stenzel, M. Hilchenbach, C. Engrand, N. Tarcea |
| Title |
Investigation of Antarctic Micrometeorites and Selected Carbonaceous Chondrites by Raman Sprectoscopy, Electron Microscopy and Mass Spectrometry |
Type |
Journal |
| Year |
2018 |
Publication |
81st Annual Meeting of the Meteoritical Society, 22-27 July 2018, Moscow, Russia, #6251 |
Abbreviated Journal |
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| Volume |
2067 |
Issue |
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Pages |
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| Keywords |
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Abstract  |
Three Antarctic micrometeorites have been studied by Raman spectroscopy, electron microscopy and mass spectrometry and compared with carbonaceous chondrites and with cometary dust analyzed in situ by the Rosetta/COSIMA instrument. |
| Programme |
1120 |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
7926 |
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| Author |
Alexandra Lavrillier, Aurore Dumont, Donatas Brandišauskas |
| Title |
Human-nature relationships in the Tungus societies of Siberia and Northeast China |
Type |
Journal |
| Year |
2018 |
Publication |
Études mongoles et sibériennes, centrasiatiques et tibétaines |
Abbreviated Journal |
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| Volume |
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Issue |
49 |
Pages |
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| Keywords |
China ethnohistory hunting landscape minority-state relationship nomadism politics reindeer herding ritual practices Russia shamanism traditional ecological knowledge Tungus |
| Abstract |
Though the Tungus are dispersed all over Siberia and Northeast China and practice various economic activities, such as hunting, reindeer herding, horse breeding, fishing, and dog breeding, they can be regarded as a coherent cultural and linguistic group; more surprisingly, in the People’s Republic of China (PRC), they are also occupied with agriculture and Mongol pastoralism. Thus, the Tungus, living as they do across the borders of different provinces and states, allow us to conduct comparat... |
| Programme |
1127 |
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Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0766-5075 |
ISBN |
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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 |
8082 |
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| Author |
Pieterse G, Krol M C, Batenburg A M, M Brenninkmeijer C A, Popa M E, O'Doherty S, Grant A, Steele L P, Krummel P B, Langenfelds R L, Wang H J, Vermeulen A T, Schmidt M, Yver C, Jordan A, Engel A, Fisher R E, Lowry D, Nisbet E G, Reimann S, Vollmer M K, Steinbacher M, Hammer S, Forster G, Sturges W T, Röckmann T, |
| Title |
Reassessing the variability in atmospheric H2 using the two-way nested TM5 model
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Type |
Journal Article |
| Year |
2013 |
Publication |
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
Abbreviated Journal |
J. Geophys. Res. |
| Volume |
118 |
Issue |
9 |
Pages |
3764-3780 |
| Keywords |
0315 Biosphere/atmosphere interactions, 0317 Chemical kinetic and photochemical properties, 0322 Constituent sources and sinks, 0365 Troposphere: composition and chemistry, 0368 Troposphere: constituent transport and chemistry, Chemical Transport Model, Dry deposition, Hydrogen isotopes, Molecular hydrogen, Sources and sinks, Tropospheric budget, |
| Abstract |
This work reassesses the global atmospheric budget of H2 with the TM5 model. The recent adjustment of the calibration scale for H2 translates into a change in the tropospheric burden. Furthermore, the ECMWF Reanalysis-Interim (ERA-Interim) data from the European Centre for Medium-Range Weather Forecasts (ECMWF) used in this study show slower vertical transport than the operational data used before. Consequently, more H2 is removed by deposition. The deposition parametrization is updated because significant deposition fluxes for snow, water, and vegetation surfaces were calculated in our previous study. Timescales of 1–2 h are asserted for the transport of H2 through the canopies of densely vegetated regions. The global scale variability of H2 and δ[DH2] is well represented by the updated model. H2 is slightly overestimated in the Southern Hemisphere because too little H2 is removed by dry deposition to rainforests and savannahs. The variability in H2 over Europe is further investigated using a high-resolution model subdomain. It is shown that discrepancies between the model and the observations are mainly caused by the finite model resolution. The tropospheric burden is estimated at 165±8 Tg H2. The removal rates of H2 by deposition and photochemical oxidation are estimated at 53±4 and 23±2 Tg H2/yr, resulting in a tropospheric lifetime of 2.2±0.2 year. |
| Programme |
416 |
| Campaign |
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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 |
2169-8996 |
ISBN |
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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 |
4452 |
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| Author |
Elsa Gautier, Joel Savarino, Joseph Erbland, James Farquhar |
| Title |
SO2 Oxidation Kinetics Leave a Consistent Isotopic Imprint on Volcanic Ice Core Sulfate |
Type |
Journal |
| Year |
2018 |
Publication |
Journal of Geophysical Research: Atmospheres |
Abbreviated Journal |
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| Volume |
123 |
Issue |
17 |
Pages |
9801-9812 |
| Keywords |
Antarctica ice core sulfur mass-independent isotope fractionation volcanic eruption |
| Abstract |
This work presents measurements of time-resolved mass-independently fractionated sulfate of volcanic origin from Antarctic ice core records that cover the last 2,600 years. These measurements are used to evaluate the time dependence of the deposited isotopic signal and to extract the isotopic characteristics of the reactions yielding sulfate from stratospheric volcanic eruptions in the modern atmosphere. Time evolution of the signal in snow (years) with respect to the fast SO2 oxidation in the stratosphere suggests that photochemically produced condensed phase is rapidly and continuously separated from the gas phase and preserved during transportation and deposition on the polar ice cap. On some eruptions, a nonzero isotopic mass balance highlights that a part of the signal can be lost during transport and/or deposition. The large number of volcanic events studied allows the Δ33S versus Δ36S and δ34S versus Δ33S slopes to be constrained at −1.56 (1σ = 0.25) and 0.09 (1σ = 0.02), respectively. The Δ33S versus Δ36S slope refines a prior determinations of Δ36S/Δ33S = −4 and overlaps the range observed for sulfur seen in early Earth samples (Archean). In recent volcanogenic sulfate, the Δ33S versus δ34S differs, however, from the Archean record. The similitude for Δ36S/Δ33S and the difference for Δ33S/δ34S suggest similar mass-independently fractionated sulfate processes to the Archean atmosphere. Using a simple model, we highlight that a combination of several mechanisms is needed to reproduce the observed isotopic trends and suggest a greater contribution from mass-dependent oxidation by OH in the modern atmosphere. |
| Programme |
1177 |
| Campaign |
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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 |
2169-8996 |
ISBN |
2169-8996 |
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 |
7420 |
| Permanent link to this record |
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| Author |
M. Battandier, L. Bonal, E. Quirico, P. Beck, C. Engrand, J. Duprat, E. Dartois |
| Title |
Characterization of the organic matter and hydration state of Antarctic micrometeorites: A reservoir distinct from carbonaceous chondrites |
Type |
Journal |
| Year |
2018 |
Publication |
Icarus |
Abbreviated Journal |
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| Volume |
306 |
Issue |
|
Pages |
74-93 |
| Keywords |
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| Abstract |
This work presents a multi-analysis on 35 Antarctic micrometeorites (AMMs) (Concordia collection 2006) by coupled Raman and Infrared (IR) spectroscopies, in comparison with samples from type 1 and 2 carbonaceous CM, CR and CI chondrites. We identified the Raman G- and D-bands revealing the presence of polyaromatic carbonaceous material on raw particles in a subset of 16 particles. Thirteen AMMs (10 Fg + 1 Fg-Sc + 1 Sc) were selected from this first subset, and analyzed by infrared microscopy along with 4 AMMs (2 Fg + 1 Fg-Sc + 1 Sc) from a previous study by Dobrica et al. (2011). These analyses showed that scoriaceous, fine-grained scoriaceous and part of the fine-grained AMMs are not hydrated, with a weak abundance of carbonaceous matter. According to the Raman criterion defined by Dobrica et al. (2011), hydrous AMMs do not show structural modifications induced by heating through the atmospheric entry. In several hydrous AMMs, the carbonaceous matter abundance is found larger than in Orgueil (CI), Murchison (CM) and QUE 99177 (CR) chondrites and their mineral content exhibit differences reflected by the structure of the silicate 10 µm band. These observations suggest that part of the AMMs originates from one, or several, distinct parent bodies with respect to primitive carbonaceous chondrites. Each hydrous Fg-AMMS displays higher CH2/CH3 ratio and a smaller carbonyl abundance than chondrites, which point toward a mild processing during atmospheric entry, possibly oxidation, which did not modify the carbon backbone and therefore do not induce differences in Raman spectroscopy. |
| Programme |
1120 |
| Campaign |
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Thesis |
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Place of Publication |
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Editor |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0019-1035 |
ISBN |
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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 |
7894 |
| Permanent link to this record |
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| Author |
Guillaume Hubert, Sébastien Aubry |
| 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 |
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| 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 μSv, 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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Series Title |
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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 |
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| Author |
G. Hubert, M. T. Pazianotto, C. A. Federico, P. Ricaud |
| Title |
Analysis of the Forbush Decreases and Ground-Level Enhancement on September 2017 Using Neutron Spectrometers Operated in Antarctic and Midlatitude Stations |
Type |
Journal |
| Year |
2019 |
Publication |
Journal of Geophysical Research: Space Physics |
Abbreviated Journal |
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| Volume |
124 |
Issue |
1 |
Pages |
661-673 |
| Keywords |
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| Abstract |
This work investigates solar events occurred in September 2017 characterized by a series of Forbush decreases and a ground level enhancement (GLE). Forbush decreases is a rapid decrease in the observed https://en.wikipedia.org/wiki/Galacticcosmicray intensity following a coronal mass ejection while GLE is induced by a strong solar event for which the flux of high-energy solar particles is sufficient to enhance the radiation level on the ground. These investigations were performed using data recorded by a neutron spectrometer network composed of a Bonner sphere system. Two instruments located at Pic-du-Midi Observatory (+2,885 m above sea level) and at Concordia station (Antarctica, +3,233 m) record simultaneously and continuously the neutron spectra, allowing to consider short-term variations during solar events. The main objective is to analyze neutron spectral properties including their energy distributions and dynamics. This paper presents cosmic ray-induced neutron spectra during active solar event leading to changes in the local cosmic ray spectrum (Forbush decreases and a GLE). Concerning the GLE, analyses show that neutrons in the evaporation domain are particularly amplified during the GLE, while other energetic domains increase uniformly. |
| Programme |
910,1112 |
| Campaign |
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| Address |
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Thesis |
Bachelor's thesis |
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Place of Publication |
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Summary Language |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
2169-9402 |
ISBN |
2169-9402 |
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 |
7556 |
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| Author |
Klonecki A, Pommier M, Clerbaux C, Ancellet G, Cammas J-P, Coheur P-F, Cozic A, Diskin G S, Hadji-Lazaro J, Hauglustaine D A, Hurtmans D, Khattatov B, Lamarque J-F, Law K S, Nedelec P, Paris J-D, Podolske J R, Prunet P, Schlager H, Szopa S, Turquety S, |
| Title |
Assimilation of IASI satellite CO fields into a global chemistry transport model for validation against aircraft measurements
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Type |
Journal Article |
| Year |
2012 |
Publication |
ATMOSPHERIC CHEMISTRY AND PHYSICS |
Abbreviated Journal |
|
| Volume |
12 |
Issue |
10 |
Pages |
4493-4512 |
| Keywords |
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| Abstract |
This work evaluates the IASI CO product against independent in-situ aircraft data from the MOZAIC program and the POLARCAT aircraft campaign. The validation is carried out by analysing the impact of assimilation of eight months of IASI CO columns retrieved for the period of May to December 2008 into the global chemistry transport model LMDz-INCA. A modelling system based on a sub-optimal Kalman filter was developed and a specific treatment that takes into account the representativeness of observations at the scale of the model grid is applied to the IASI CO columns and associated errors before their assimilation in the model. Comparisons of the assimilated CO profiles with in situ CO measurements indicate that the assimilation leads to a considerable improvement of the model simulations in the middle troposphere as compared with a control run with no assimilation. Model biases in the simulation of background values are reduced and improvement in the simulation of very high concentrations is observed. The improvement is due to the transport by the model of the information present in the IASI CO retrievals. Our analysis also shows the impact of assimilation of CO on the representation of transport into the Arctic region during the POLARCAT summer campaign. A considerable increase in CO mixing ratios over the Asian source region was observed when assimilation was used leading to much higher values of CO during the cross-pole transport episode. These higher values are in good agreement with data from the POLARCAT flights that sampled this plume. |
| Programme |
416 |
| Campaign |
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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 Issue |
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Edition |
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| ISSN |
1680-7324 |
ISBN |
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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 |
4268 |
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| Author |
Picard G, Domine F, Krinner G, Arnaud L, Lefebvre E, |
| Title |
Inhibition of the positive snow-albedo feedback by precipitation in interior Antarctica |
Type |
Journal |
| Year |
2012 |
Publication |
Nature Climate Change |
Abbreviated Journal |
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| Volume |
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Issue |
11 |
Pages |
795-798 |
| Keywords |
limate change Cryospheric science |
| Abstract |
This study uses satellite data to study snow grain size–albedo relationships over the whole Antarctic Plateau. The findings suggest that increased precipitation resulting from climate change will effectively compensate for the decreased albedo that should have resulted from warming, thereby inhibiting the expected ice–albedo feedback. |
| Programme |
1013 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
Bachelor's thesis |
| Publisher |
Nature Publishing Group |
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 |
1758-6798 |
ISBN |
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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 |
456 |
| Permanent link to this record |
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| Author |
Gaëlle Lamarque, Jérôme Bascou, René-Pierre Ménot, Jean-Louis Paquette, Simon Couzinié, Yann Rolland, Jean-Yves Cottin |
| Title |
Ediacaran to lower Cambrian basement in eastern George V Land (Antarctica): Evidence from U-Pb dating of gneiss xenoliths and implications for the South Australia-East Antarctica connection |
Type |
Journal |
| Year |
2018 |
Publication |
Lithos |
Abbreviated Journal |
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| Volume |
318-319 |
Issue |
|
Pages |
219-229 |
| Keywords |
Antarctica-Australia connection George V Land; Gondwana margin; Ross orogeny; Zircon and monazite UPb dating |
| Abstract |
This study presents the first geochronological results on basement rocks from the Penguin-Bage-Webb (PBW) domain located east of the Neoarchean-Paleoproterozoic Terre Adélie craton, Antarctica. Investigated samples are paragneiss xenoliths hosted within early Paleozoic granitoids, which were emplaced during the Ross orogeny. Zircon UPb dating yielded ages ranging from the Archean to the Cambrian, with a dominant Ediacaran (550–635 Ma) population and maximum depositional ages around 570–575 Ma. U–Th–Pb analyses of monazite suggest that the metamorphic event that formed the gneiss samples occured at ca. 515 Ma, shortly prior to incorporation within the granitic magmas. The studied samples likely represent relics of the pre-Gondawana Pacific margin, which was subsequently deformed and metamorphosed during the early Paleozoic Ross orogeny. The obtained zircon UPb date distributions present similarities with those of the Kanmantoo and Nargoon sediments in Southern Australia and provide new constrains for the correlations between East Antarctica and South Australia before the opening of the Southern Ocean. |
| Programme |
1003 |
| Campaign |
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| Address |
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| Corporate Author |
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Thesis |
Bachelor's thesis |
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Place of Publication |
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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 Issue |
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Edition |
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| ISSN |
0024-4937 |
ISBN |
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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 |
7650 |
| Permanent link to this record |
