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SUMMARY:Arctic Subsurface Ocean Change under the Climate Crisis: Long-Term
  CPIES Observations in the Chukchi Sea - Dr. Jae-Hun Park (Inha University
 )
DTSTART:20260219T160000Z
DTEND:20260219T170000Z
UID:TALK243784@talks.cam.ac.uk
CONTACT:109526
DESCRIPTION:Long-term observations from arrays of current- and pressure-re
 cording inverted echo sounders (CPIES) in the Chukchi Sea reveal pronounce
 d variability in near-bottom thermal and dynamical processes\, as well as 
 in subsurface ocean heat content. This variability is closely linked to ch
 anges in sea-ice conditions and the associated inflow of Atlantic Water (A
 W). Time series of near-bottom temperatures along the Chukchi Slope exhibi
 t quasi-seasonal to quasi-monthly variability\, with warmer conditions dur
 ing winter and spring corresponding to intensified AW boundary currents an
 d a deepening of the lower AW layer. These variations are modulated by reg
 ional sea surface height gradients and wind stress curl over the Chukchi S
 helf\, which regulate AW transport through geostrophic adjustment. Observa
 tions of near-bottom currents further indicate that deep near-inertial mot
 ions and topographic Rossby wave activity are strongly seasonal\, with sub
 stantially enhanced energy levels during summer and fall following sea-ice
  melt-out. Longer-term acoustic round-trip travel time measurements betwee
 n the seafloor and the sea surface\, together with hydrographic observatio
 ns\, reveal steric warming in the Northwind Abyssal Plain over the past se
 veral years\, likely associated with a weakened Beaufort Gyre and increase
 d AW inflow. These results demonstrate that the recent acceleration of Arc
 tic sea-ice decline exerts strong control over ongoing subsurface ocean ch
 anges in the Arctic Ocean.
LOCATION:Scott Polar Research Institute\, main lecture theatre
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