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. (2020). Bachelor's thesis, , .
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Guillot T. (2020). Discovering Exoplanets from Antarctica with ASTEP. Bachelor's thesis, , .
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Crouzet N., et al. (2020). Towards ASTEP+, a two-color photometric telescope at Dome C, Antarctica (Vol. Paper 11447-23). Bachelor's thesis, , .
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Labonne J., Robin J.-p., Améziane N., Barbraud C., Bétoulle S., Bost C., Boulinier T., Charassin J.-b., Cotté C., Eleaume M., Gallut C., Gaudin P., Guinet C., Hennion F., Koubbi P., Le Bohec C., Lebouvier M., Mazé C., Renault D., Ropert-coudert Y., Saucède T. Et Weimerskirch H. (2020). Implementation of the Long Term Ecological Research network of the French Southern and Antarctic Lands (LTER ZATA “ Zone Atelier Antarctique et Terres Australes”): toward an overall monitoring of the southern ecosystem through its marine and terrestrial communities.
Abstract: Since 2000, the French Long Term Ecological Research network of the French Southern and Antarctic Lands (LTER ZATA “ Zone Atelier Antarctique et Terres Australes”) has endeavoured to monitor the dynamics of biodiversity in Antarctic and sub-Antarctic marine and terrestrial ecosystems. Our LTER encompasses multiple scientific programs and can provide access to long term monitoring of more than 40 marine, freshwater and terrestrial vertebrate species (including 27 bird species), 20 terrestrial and freshwater plant and invertebrate species. For some species, monitoring was initiated well before the 2000s, as earlier as the years 1960-1970. More recently, monitorings have been initiated at the community level for pelagic and coastal marine biota, and were complemented by eco-physiological, eco-epidemiological and stress observing projects focussing on multiple species and communities. The main objective of our LTER is to provide a general dashboard to assess health of southern ecosystems along with the selective pressures and overall resilience due to environmental changes. The French LTER ZATA has strongly benefited from sustained support from the French Polar Institute over decades, clearly linking fundings and resource allocations to our capacity to assess and understand southern ecosystems. In this talk, we will give a first picture of this dashboard based on our existing databases. We will also present future developments and strategies that, for sure, have now to be integrated at the international level.
Programme: 119
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Marion Leduc-Leballeur, Ghislain Picard, Giovanni Macelloni, Arnaud Mialon, Yann H. Kerr. (2020). Melt in Antarctica derived from Soil Moisture and Ocean Salinity (SMOS) observations at L band (Vol. 14).
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. (2020). Interannual variability of summer surface mass balance and surface melting in the Amundsen sector, West Antarctica (Vol. 14).
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. (2020). Supercooled liquid water cloud observed, analysed, and modelled at the top of the planetary boundary layer above Dome C, Antarctica (Vol. 20).
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. (2020). (Vol. 732).
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F. Pitout, A. Marchaudon, K. J. Trattner, J. Berchem, H. Laakso, C. P. Escoubet. (2020). Simultaneous Polar and Cluster Observations in the Northern and Southern Middle-Altitude Polar Cusps Around Equinox (Vol. 125).
Abstract: We present an event of simultaneous observations of the northern and southern middle-altitude polar cusps by the Polar spacecraft and Cluster fleet that occurred on 23 September 2004. We examine the possible asymmetries in the fields and plasma parameters, although the proximity of the equinox should limit these asymmetries. Ion sensors reveal two dispersions in both cusps, and data analysis leads to the conclusion that those dispersions are due to pulsed reconnection at a single X-line, which runs along the subsolar magnetopause. While the electromagnetic and particle energy fluxes injected in both cusp are globally very similar, we report significant differences in ion dispersions, width of the low-latitude boundary layer, and peak convection velocities. We ascribe these differences to the dipole tilt that introduces an asymmetry in the magnetosheath flow at the exterior cusps.
Keywords: dayside magnetosphere hemispheric asymmetry polar cusp
Programme: 312
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Weisen Shen, Douglas A. Wiens, Andrew J. Lloyd, Andrew A. Nyblade. (2020). A Geothermal Heat Flux Map of Antarctica Empirically Constrained by Seismic Structure (Vol. 47).
Abstract: The geothermal heat flux (GHF) is an important boundary condition for modeling the movement of the Antarctic ice sheet but is difficult to measure systematically at a continental scale. Earlier GHF maps suffer from low resolution and possibly biased assumptions in tectonism and crustal heat generation, resulting in significant uncertainty. We present a new GHF map for Antarctica constructed by empirically relating the upper mantle structure to known GHF in the continental United States. The new map, compared with previously seismologically determined one, has improved resolution and lower uncertainties. New features in this map include high GHF in the southern Transantarctic Mountains where warmer uppermost mantle is introduced by lithospheric removal and in the Thwaites Glacier region. Additionally, a modest GHF in the central West Antarctic Rift system near the Siple Coast and an absence of large-scale regions with GHF greater than 90 mW/m2 are found.
Keywords: Antarctica crust and uppermost mantle geothermal heat flux ice sheet modeling
Programme: 133
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