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SUMMARY:Louis-Alexandre Couston (Laboratoire de Physique\, ENS de Lyon)
DTSTART:20210602T130000Z
DTEND:20210602T140000Z
DTSTAMP:20260423T021349Z
UID:BAS-PO/18
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/BAS-PO/18/">
 Turbulent convection in Antarctic Subglacial Lakes</a>\nby Louis-Alexandre
  Couston (Laboratoire de Physique\, ENS de Lyon) as part of BAS Polar Ocea
 ns Seminar\n\n\nAbstract\nTrapped beneath the Antarctic ice sheet lie over
  400 subglacial lakes\, which are considered to be extreme\, isolated\, ye
 t viable habitats for microbial life. The physical conditions within subgl
 acial lakes are critical to evaluating how and where life may best exist. 
 In this talk\, I will demonstrate that Earth’s geothermal flux provides 
 efficient stirring of Antarctic subglacial lake water. I will show that mo
 st lakes are in a regime of vigorous turbulent vertical convection\, enabl
 ing suspension of spherical particulates with diameters up to 36 micromete
 rs. Thus\, dynamic flows support efficient mixing of nutrient- and oxygen-
 enriched meltwater derived from the overlying ice\, which is essential for
  biome support within the water column. I will show that a stable layer is
 olates the well-mixed bulk from the ice-water interface in lakes beneath a
  thin (<3.166 kilometers) ice cover\, because of the nonlinear equation of
  state of water. I will discuss how relaxing the approximations that the c
 urrent theory relies on (flat ice-water ceiling) might change the predicti
 ons\, as well as the implications of this work for future lake exploration
 .\n
LOCATION:https://researchseminars.org/talk/BAS-PO/18/
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