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SUMMARY:Topography-mediated Transport of Warm Deep Water across the Contin
 ental Shelf Slope\, East Antarctica - Chengyan Liu\, Southern Marine Scien
 ce and Engineering Guangdong Laboratory 
DTSTART:20220915T130000Z
DTEND:20220915T140000Z
UID:TALK172859@talks.cam.ac.uk
CONTACT:Dr. Shenjie Zhou
DESCRIPTION:Warm Deep Water intrusion over the Antarctic continental shelv
 es threatens the Antarctic ice-sheet stability by enhancing the basal melt
 ing of ice shelves. In East Antarctica\, the Antarctic Slope Current (ASC)
 \, along with the Antarctic Slope Front (ASF)\, acts as a potential vortic
 ity barrier to prevent the warm modified Circumpolar Deep Water (mCDW) fro
 m ventilating the cold and fresh shelf. However\, mCDW onshore transport i
 s still observed within certain shelf regions\, such as submarine troughs 
 running perpendicular to the continental shelf. This study focuses on the 
 dynamic mechanisms governing mCDW intrusion within a submarine trough over
  the fresh shelf regions\, East Antarctica. Based on an idealized eddy-res
 olving coupled ocean-ice shelf model\, two high resolution process-oriente
 d numerical experiments are conducted to reveal the mechanisms responsible
  for the mCDW onshore transport. Three dynamic mechanisms governing cross-
 slope mCDW intrusion are identified: 1) the bottom pressure torque\, 2) th
 e topography beta spiral\, and 3) the topography Rossby waves. These three
  mechanisms simultaneously govern the mCDW intrusion together. The bottom 
 pressure torque plays a leading role in driving the time-mean onshore flow
  whose vertical structure is determined by the topography beta spiral\, wh
 ile the topography Rossby waves contribute to the high-frequency oscillati
 ons in the onshore volume and heat transport. The simulated spatial distri
 bution and seasonality of mCDW intrusion qualitatively coincide with the o
 bserved mCDW intrusion over fresh shelf regions\, East Antarctica. Both th
 e topography beta spiral and the ASC play an important role in governing t
 he seasonality of mCDW intrusion.
LOCATION:https://ukri.zoom.us/j/98617015574\; BAS seminar room 330b
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