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Author  |
Yan Axel Gomez Coutouly And Angela K. Gore |
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Title |
Little Panguingue Creek: a c. 9600 year-old prehistoric knapping workshop in the Nenana valley, Central Alaska |
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Communication |
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2019 |
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Paper presented at the Workshop PACE, Prehistoric Adaptations to Cold Environments, 8-9 janvier 2019 |
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1217 |
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yes |
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6800 |
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Author |
Yan Axel Gómez Coutouly |
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Title |
Questioning the Anthropic Nature of Pedra Furada and the Piauà Sites |
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Journal |
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Year |
2022 |
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PaleoAmerica |
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8 |
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1 |
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29-52 |
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Brazil geofacts Late Glacial Maximum Pedra Furada Peopling of the Americas |
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Abstract |
Many archaeologists are still skeptical about a human presence in the Americas during or before the Late Glacial Maximum (LGM), considering that the claim is not yet sustained by hard evidence. Boqueirão da Pedra Furada (Brazil) is one of the most famous pre-LGM claims, but the site has so far been considered ambiguous, and similar concerns have been raised about nearby sites. Nonetheless, for E. Boëda and co-workers, who have been working at these sites, researchers who are still skeptical about the anthropic origin of the assemblages have a psychological barrier and no scientific arguments. Are all skeptics completely blinded by their preconceptions that they cannot see the obvious and unambiguous evidence? To find out, I reviewed the numerous publications of the Piauà sites, and the outcome of my analysis is quite simple: the anthropic nature of the LGM/pre-LGM artifacts of the Piauà sites has not been demonstrated. |
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1217 |
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2055-5563 |
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yes |
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8585 |
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Author |
Yan Axel Gómez Coutouly |
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Title |
L'archéologie en région arctique et sub-arctique |
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2019 |
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La Lettre de l'InSHS |
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58 |
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22-23 |
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1217 |
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yes |
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8691 |
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Yan Axel Gomez Coutouly |
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Title |
Un peuplement antérieur à 20 000 ans en Amérique ? |
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Book Chapter |
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Year |
2021 |
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« Et pourtant elle tourne ! » blocages épistémologiques en archéologie. Colloque organisé par Laure Fontana et Sophie A. de Beaune, (Projets collectifs ArScAn), 18-19 novembre 2021, Campus de Nanterre Université, France |
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1217 |
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Bachelor's thesis |
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yes |
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8692 |
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Author |
Yagova, N.V.; Pilipenko, V.A.; Lanzerotti, L.J.; Engebretson, M.J.; Rodger, A.S.; Lepidi, S.; Papitashvili, V.O. |
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Title |
Two-dimensional structure of long-period pulsations at polar latitudes in Antarctica |
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Journal Article |
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2004 |
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Journal of geophysical research-atmospheres |
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J. Geophys. Res. |
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109 |
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2776 Magnetospheric Physics: Polar cap phenomena; 2752 Magnetospheric Physics: MHD waves and instabilities; 2744 Magnetospheric Physics: Magnetotail; 2724 Magnetospheric Physics: Magnetopause, cusp, and boundary layers |
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Two-dimensional (2-D) statistical distributions of spectral power and coherence of polar geomagnetic variations with quasi-periods about 10 min are analyzed using data from magnetometer arrays in Antarctica. Examination of the 2-D patterns of spectral power and coherence shows the occurrence of significant variations in geomagnetic power levels but with low spatial coherence near the cusp projection and in the auroral region. At the same time, low-amplitude pulsations, which we coin Pi cap
3 pulsations, are very coherent throughout the polar cap. The region occupied by coherent Pi cap
3 pulsations is shifted toward local MLT night from the geomagnetic pole and is decoupled from the regions of auroral and cusp ULF activity. The spectral power varies with time at polar latitudes in a manner different from that at auroral latitudes. Diurnal variations of power at different stations at the same geomagnetic latitude exhibit different behavior depending on the station's position relative to geomagnetic and geographic poles. This asymmetry is shown to be partly attributed to the variations of the ionospheric conductance. The primary source of polar pulsations is probably related to intermittent magnetosheath turbulence and tail lobe oscillations, though a particular propagation mechanism has not as yet been identified. |
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905 |
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American Geophysical Union |
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0148-0227 |
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IPEV @ Thierry.Lemaire @ |
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5539 |
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Yagi Yuji, Nakao Atsushi, Kasahara Amato, |
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Title |
Smooth and rapid slip near the Japan Trench during the 2011 Tohoku-oki earthquake revealed by a hybrid back-projection method
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Journal Article |
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2012 |
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Earth and Planetary Science Letters |
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Earth Planet. Sci. Lett. |
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355-356 |
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94-101 |
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2011 Tohoku-oki earthquake, back-projection, seismic source process, smooth and rapid slip near trench, |
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We developed a new back-projection method that uses teleseismic P-waveforms to integrate the direct P-phase with reflected phases from structural discontinuities near the source and used it to estimate the spatiotemporal distribution of the seismic energy release of the 2011 Tohoku-oki earthquake. We projected a normalized cross-correlation of observed waveforms with corresponding Green's functions onto the seismic source region to obtain a high-resolution image of the seismic energy release. Applying this method to teleseismic P-waveform data of the 2011 Tohoku-oki earthquake, we obtained spatiotemporal distributions of seismic energy release for two frequency bands, a low-frequency dataset and a high-frequency dataset. We showed that the energy radiated in the dip direction was strongly frequency dependent. The area of major high-frequency seismic radiation extended only downdip from the hypocenter, whereas the area of major low-frequency seismic radiation propagated both downdip and updip from the hypocenter. We detected a large release of seismic energy near the Japan Trench in the area of maximum slip, which was also the source area of the gigantic tsunami, when we used only the low-frequency dataset. The timing of this large seismic energy release corresponded to an episode of smooth and rapid slip near the Japan Trench, and reflects the strong dependence of the seismic energy distribution obtained on the frequency band of the input waveform dataset. The episode of smooth and rapid slip may have been the trigger for a release of roughly all of the accumulated elastic strain in the seismic source region of the 2011 Tohoku-oki earthquake.
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133 |
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0012-821X |
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yes |
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4647 |
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Y. Quesnel, W. Zylberman, P. Rochette, M. Uehara, J. Gattacceca, G. R. Osinski, P. Dussouillez, C. Lepaulard, C. Champollion |
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Title |
Geophysical signature of the Tunnunik impact structure, Northwest Territories, Canada |
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2020 |
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Meteoritics & Planetary Science |
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55 |
Issue |
3 |
Pages |
480-495 |
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In 2011, the discovery of shatter cones confirmed the 28 km diameter Tunnunik complex impact structure, Northwest Territories, Canada. This study presents the first results of ground-based electromagnetic, gravimetric, and magnetic surveys over this impact structure. Its central area is characterized by a 10 km wide negative gravity anomaly of about 3 mGal amplitude, roughly corresponding to the area of shatter cones, and associated with a positive magnetic field anomaly of 120 nT amplitude and 3 km wavelength. The latter correlates well with the location of the deepest uplifted strata, an impact-tilted Proterozoic dolomite layer of the Shaler Supergroup exposed near the center of the structure and intruded by dolerite dykes. Locally, electromagnetic field data unveil a conductive superficial formation which corresponds to an 80–100 m thick sand layer covering the impact structure. Based on the measurements of magnetic properties of rock samples, we model the source of the magnetic anomaly as the magnetic sediments of the Shaler Supergroup combined with a core of uplifted crystalline basement with enhanced magnetization. More classically, the low gravity signature is attributed to a reduction in density measured on the brecciated target rocks and to the isolated sand formations. However, the present-day fractured zone does not extend deeper than 1 km in our model, indicating a possible 1.5 km of erosion since the time of impact, about 430 Ma ago. |
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1139 |
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1945-5100 |
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yes |
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8266 |
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Y. Quesnel, J. Gattacceca, G. R. Osinski, P. Rochette |
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Title |
ORIGIN OF THE CENTRAL MAGNETIC ANOMALY AT HAUGHTON IMPACT STRUCTURE, CANADA |
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Conference - International - Poster |
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2011 |
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Context: Located on Devon Island, Nunavut, Canada, the 23-km diameterHaughton impact structure is one of the best-preserved medium-size compleximpact structures. The impact occurred ~39 Ma ago in to a target formationcomposed of a 2-km thick
Meteoritical Society Meeting Greenwhich (indexed in Meteoritics and Planetary Sciences) |
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1068 |
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yes |
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3370 |
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Author |
Y. Le Meur & A. Coatanea. |
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Mission Nivmer St Paul OP3 2016, novembre 2016. |
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Report |
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2016 |
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688 |
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yes |
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6810 |
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Y. Klanten, R.-M. Couture, K. S. Christoffersen, W. F. Vincent, D. Antoniades |
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Title |
Oxygen Depletion in Arctic Lakes: Circumpolar Trends, Biogeochemical Processes, and Implications of Climate Change |
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2023 |
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Global Biogeochemical Cycles |
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37 |
Issue |
5 |
Pages |
e2022GB007616 |
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Arctic lakes biochemical processes climate change dissolved oxygen freshwater meta-analysis |
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Abstract |
Polar amplification of climate change has the potential to cause large-scale shifts in the dissolved oxygen (DO) dynamics of Arctic lakes, with implications for fish survival, greenhouse gas production, and drinking water quality. While DO is also a sentinel of environmental changes of physical, chemical, and biological nature (e.g., ice cover, temperature, dissolved organic carbon, photosynthesis, and respiration), no synthesis exists of current knowledge of DO dynamics across the diverse freshwater systems of the Arctic. We thus conducted a systematic review of the literature that yielded DO data from 167 sites north of the Subarctic limit (based on vegetation zones), spanning 76 years and including 40 sites with time series. The compilation revealed insufficient observations for adequate representativeness of oxygen dynamics over Arctic ecosystem gradients. We described the main processes controlling DO budgets of Arctic lakes and tested relationships of summer oxygen depletion with maximum depth and latitude. The meta-analysis showed that most sites with low O2 concentrations were shallow (<10 m) and situated toward the southern end of the latitudinal gradient. Permanently stratified lakes with deep, perennially anoxic basins were located toward the northern end of the gradient. By way of a conceptual model, we identified the direct and indirect drivers and mechanisms that lead to changes in oxygen budgets in the context of the warming Arctic. This comprehensive update on available data allowed us to suggest future research directions and recommend the use of moored instruments for continuous all-season observations, combined with modeling, remote sensing, and paleo-reconstructions. |
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1042 |
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1944-9224 |
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8633 |
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