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SUMMARY:Ocean dynamics in the Ross Ice Shelf cavity from in situ observati
 ons - Yingpu Xiahou\, University of Auckland
DTSTART:20250423T130000Z
DTEND:20250423T140000Z
UID:TALK228064@talks.cam.ac.uk
CONTACT:Dr Birgit Rogalla
DESCRIPTION:The future response of ice shelves to climate through ocean wa
 rming is a key unknown for climate projections\, especially global sea lev
 el rise. The Ross Ice Shelf ocean cavity is one of the least observed regi
 ons in the ocean\, with its broad circulation patterns primarily inferred 
 from remotely sensed estimates of tides\, bathymetry\, and melt rates. I a
 im to advance our understanding of the ocean cavity under the Ross Ice She
 lf - the southern-most and largest-by area of all Earth’s ice shelves. T
 o achieve this\, I analyzed a multi-year hydrographic moored timeseries fr
 om the central Ross Ice Shelf cavity (80◦39.497′S\, 174◦27.678′E).
  These data help address three key processes: (i) the general circulation\
 ; (ii) the appearance and impact of baroclinic eddy events\; and (iii) tid
 al modulation of the ice-ocean boundary layer structure and the implicatio
 ns for ice melting. In terms of circulation and the inter-annual changes\,
  stronger melting/refreezing occurred between late September 2019 to late 
 December 2019\, which is linked to the inter-annual sea ice production in 
 the Ross Ice Shelf Polynya. Notably\, cold-water interleaving in the mid-w
 ater column exhibits distinct seasonality. An analysis of baroclinic eddie
 s identifies coherent structures that are around 22 km in diameter with a 
 velocity scale of between 0.8 and 1.8 cm/s. The thermohaline structure of 
 the eddies suggests that they have the potential to entrain High Salinity 
 Shelf Water from the benthic water column to the mid-water column. On the 
 question of tidal modulation of the ice shelf-ocean interaction\, the resu
 lts suggest that tides modulate the melt rate by altering the boundary lay
 er structure over a spring-neap cycle. These new findings demonstrate the 
 rich variability within the Ross Ice Shelf ocean cavity\, ranging from lar
 ge interannual-seasonal scales\, through to multi-week eddy scales and the
 n down to tidal and mixing timescales.
LOCATION:BAS Seminar Room  330b
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