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Title |
Investigation of Antarctic Micrometeorites and Selected Carbonaceous Chondrites by Raman Sprectoscopy, Electron Microscopy and Mass Spectrometry |
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2018 |
Publication |
81st Annual Meeting of the Meteoritical Society, 22-27 July 2018, Moscow, Russia, #6251 |
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2067 |
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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. |
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1120 |
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yes |
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7926 |
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Title |
Human-nature relationships in the Tungus societies of Siberia and Northeast China |
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2018 |
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49 |
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Keywords |
China ethnohistory hunting landscape minority-state relationship nomadism politics reindeer herding ritual practices Russia shamanism traditional ecological knowledge Tungus |
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1127 |
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0766-5075 |
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yes |
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8082 |
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Title |
Reassessing the variability in atmospheric H2 using the two-way nested TM5 model
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Journal Article |
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Year |
2013 |
Publication |
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
118 |
Issue |
9 |
Pages |
3764-3780 |
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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, |
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416 |
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2169-8996 |
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yes |
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4452 |
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Author |
Elsa Gautier, Joel Savarino, Joseph Erbland, James Farquhar |
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Title |
SO2 Oxidation Kinetics Leave a Consistent Isotopic Imprint on Volcanic Ice Core Sulfate |
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Year |
2018 |
Publication |
Journal of Geophysical Research: Atmospheres |
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Volume |
123 |
Issue |
17 |
Pages |
9801-9812 |
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Keywords |
Antarctica ice core sulfur mass-independent isotope fractionation volcanic eruption |
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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 ?33S versus ?36S and ?34S versus ?33S slopes to be constrained at ?1.56 (1? = 0.25) and 0.09 (1? = 0.02), respectively. The ?33S versus ?36S slope refines a prior determinations of ?36S/?33S = ?4 and overlaps the range observed for sulfur seen in early Earth samples (Archean). In recent volcanogenic sulfate, the ?33S versus ?34S differs, however, from the Archean record. The similitude for ?36S/?33S and the difference for ?33S/?34S 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. |
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1177 |
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2169-8996 |
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2169-8996 |
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yes |
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Call Number |
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Serial |
7420 |
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Author |
M. Battandier, L. Bonal, E. Quirico, P. Beck, C. Engrand, J. Duprat, E. Dartois |
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Title |
Characterization of the organic matter and hydration state of Antarctic micrometeorites: A reservoir distinct from carbonaceous chondrites |
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Journal |
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Year |
2018 |
Publication |
Icarus |
Abbreviated Journal |
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Volume |
306 |
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Pages |
74-93 |
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Programme |
1120 |
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ISSN |
0019-1035 |
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Approved |
yes |
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Call Number |
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Serial |
7894 |
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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 |
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Journal |
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Year |
2017 |
Publication |
Radiation Research |
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Volume |
188 |
Issue |
5 |
Pages |
597-611 |
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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. |
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1112 |
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ISSN |
0033-7587 |
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0033-7587 |
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yes |
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Call Number |
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Serial |
6725 |
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Author |
G. Hubert, M. T. Pazianotto, C. A. Federico, P. Ricaud |
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Title |
Analysis of the Forbush Decreases and Ground-Level Enhancement on September 2017 Using Neutron Spectrometers Operated in Antarctic and Midlatitude Stations |
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Year |
2019 |
Publication |
Journal of Geophysical Research: Space Physics |
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124 |
Issue |
1 |
Pages |
661-673 |
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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. |
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910,1112 |
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Bachelor's thesis |
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ISSN |
2169-9402 |
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2169-9402 |
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yes |
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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, |
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Title |
Assimilation of IASI satellite CO fields into a global chemistry transport model for validation against aircraft measurements
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Journal Article |
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2012 |
Publication |
ATMOSPHERIC CHEMISTRY AND PHYSICS |
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Volume |
12 |
Issue |
10 |
Pages |
4493-4512 |
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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. |
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416 |
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ISSN |
1680-7324 |
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yes |
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4268 |
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Author |
Picard G, Domine F, Krinner G, Arnaud L, Lefebvre E, |
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Title |
Inhibition of the positive snow-albedo feedback by precipitation in interior Antarctica |
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2012 |
Publication |
Nature Climate Change |
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Issue |
11 |
Pages |
795-798 |
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Keywords |
limate change Cryospheric science |
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Programme |
1013 |
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Bachelor's thesis |
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Nature Publishing Group |
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ISSN |
1758-6798 |
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yes |
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Serial |
456 |
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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 |
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Year |
2018 |
Publication |
Lithos |
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Volume |
318-319 |
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219-229 |
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Keywords |
Antarctica-Australia connection George V Land; Gondwana margin; Ross orogeny; Zircon and monazite UPb dating |
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1003 |
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Bachelor's thesis |
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0024-4937 |
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yes |
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Call Number |
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7650 |
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