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SUMMARY:Persistent warming and reduced freshening of the abyssal Southern 
 Ocean. - Kathy Gunn - Kathryn Gunn (University of Southampton)
DTSTART:20250924T143000Z
DTEND:20250924T153000Z
UID:TALK236692@talks.cam.ac.uk
CONTACT:Katherine Turner
DESCRIPTION:Recent observations reveal that Antarctic Bottom Water is thin
 ning\, warming\, freshening\, and spreading more slowly  northward into t
 he abyssal ocean. Using the most-up-to-date historical data (1985-2024) al
 ongside simulations out to 2050\, I review and assess abyssal ocean chang
 es that are ongoing and projected. Between 1985-2024\, isopycnals below 30
 00 m have descended at a rate of -95±5 m/decade\, and have been replaced 
 by warmer water\, resulting in warming of 0.02±0.02 °C/decade. Freshenin
 g of -0.002±0.003 g/kg/decade also occurred\, due to meltwater-driven cha
 nges in the continental shelf waters.  Projections\, in line with the lat
 est observations\, suggest thinning and warming will persist in response t
 o continued glacial melt. However\, freshening slows and even reverses. Me
 ltwater makes shelf waters too light to reach the deep ocean\, weakens the
  shelf-to-abyss connection\, alters long-standing trends\, and doubles the
  deep ocean contribution to Southern Ocean sea level rise.
LOCATION:BAS Seminar Room 1 (http://bit.ly/4pDlm6l)
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