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. (2021). (Vol. 2).
Keywords: Physical oceanography
Programme: 688
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. (2022). Clean air policies are key for successfully mitigating Arctic warming (Vol. 3).
Keywords: Atmospheric chemistry Climate-change mitigation
Programme: 1255
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Charlotte Bruland, Celine Hadziioannou. (2023). Gliding tremors associated with the 26 second microseism in the Gulf of Guinea (Vol. 4).
Abstract: A location in the Gulf of Guinea, which emits monochromatic seismic waves at 26-second period, seemingly continuously, was identified in the 1960s. However, the origin of these seismic waves remains enigmatic to date. Here we use three-component data from two seismic arrays in Africa, as well as additional seismic data compiled from around the world, to investigate the tremors. We identify frequency glides accompanying the previously known 26 s microseism which start at the same frequency and originate in the same, fixed location in the Gulf of Guinea. The stable characteristics of the tremors, their low frequency range, the implied large spatial scale, and the decades-long timescales where this phenomenon seems to have been active, all point towards a gap in our understanding of long period oceanic and volcanic signals. Since tremor is an important tool to monitor volcanoes, understanding this phenomenon may affect future forecasting of volcanic activity.
Keywords: Geophysics Seismology Volcanology
Programme: 133
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Jordi Diaz. (2022). Atmosphere-solid earth coupling signals generated by the 15 January 2022 Hunga-Tonga eruption (Vol. 3).
Abstract: The January 15th 2022 eruption of the Hunga-Tonga volcano was associated to one of the highest energy volcanic explosions of the past few decades. Here we present a compilation of data from global seismic networks to explore three main topics: the time evolution of the eruption, the propagation of the atmospheric waves around the Earth and the low-frequency, long-lasting seismic signals worldwide after the main event. We find that the eruption started around 04:00, included two large explosions at 05:30 and 08:25 and produced atmospheric waves which circled the Earth more than two times during a time span of 3.5 days and were detected seismically. We also identify very low frequency signals, detected over several hours, which we interpret as resulting from the excitation of Earth normal modes. To our knowledge, there are no previous examples of atmospheric-solid Earth coupling over such a long time interval and only two examples of normal mode excitation following volcanic eruptions.
Keywords: Geophysics Natural hazards Seismology Volcanology
Programme: 133
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Clive R. McMahon, Mark A. Hindell, Jean Benoit Charrassin, Richard Coleman, Christophe Guinet, Robert Harcourt, Sara Labrousse, Benjemin Raymond, Michael Sumner, Natalia Ribeiro. (2023). Southern Ocean pinnipeds provide bathymetric insights on the East Antarctic continental shelf (Vol. 4).
Keywords: Environmental sciences Ocean sciences
Programme: 1201
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. (2023). Probing the limits of sampling gaseous elemental mercury passively in the remote atmosphere (Vol. 3).
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. (2021). Effects of Climate and Atmospheric Nitrogen Deposition on Early to Mid-Term Stage Litter Decomposition Across Biomes (Vol. 4).
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. (2021). Sexual segregation in a sexually dimorphic seabird: a matter of spatial scale (Vol. 1).
Abstract: A recommendation of: Christophe Barbraud, Karine Delord, Akiko Kato, Paco Bustamante, Yves Cherel Sexual segregation in a highly pagophilic and sexually dimorphic marine predator https://doi.org/10.1101/472431
Programme: 109
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. (2019). Sustained Antarctic Research: A 21st Century Imperative (Vol. 1).
Keywords: adaptations atmosphere-ocean couplings climate change conservation Earth systems ice sheet politics and governance sea level Southern Ocean sustainability
Programme: 137
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. (2021). Similar circling movements observed across marine megafauna taxa (Vol. 24).
Abstract: Advances in biologging technology have enabled 3D dead-reckoning reconstruction of marine animal movements at spatiotemporal scales of meters and seconds. Examining high-resolution 3D movements of sharks (Galeocerdo cuvier, N = 4; Rhincodon typus, N = 1), sea turtles (Chelonia mydas, N = 3), penguins (Aptenodytes patagonicus, N = 6), and marine mammals (Arctocephalus gazella, N = 4; Ziphius cavirostris, N = 1), we report the discovery of circling events where animals consecutively circled more than twice at relatively constant angular speeds. Similar circling behaviors were observed across a wide variety of marine megafauna, suggesting these behaviors might serve several similar purposes across taxa including foraging, social interactions, and navigation.
Keywords: Animals Biological Sciences Ecology Ethology Zoology
Programme: 394
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