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SUMMARY:High-resolution firn on Antarctic ice shelves - Tesse van den Aker
  (IMAU\, Utrecht)
DTSTART:20250313T140000Z
DTEND:20250313T150000Z
UID:TALK228436@talks.cam.ac.uk
CONTACT:Siddharth Gumber
DESCRIPTION:Firn provides pore space that can retain meltwater. Its deplet
 ion on the Antarctic ice shelves can lead to hydrofracturing. To understan
 d firn behaviour\, we model its densification\, which is so far done on a 
 relatively course grid of 27 km in the IMAU firn densification model (IMAU
 -FDM). The coarse resolution cannot capture firn air content (FAC) gradien
 ts in areas with complex topographies\, overestimating FAC near the ground
 ing lines. This study pioneers statistically downscaled forcing data to dr
 ive IMAU-FDM at a 2 km resolution on the ice shelves Larsen C\, George VI\
 , Roi Baudouin\, and Thwaites. Near grounding lines on the ice shelves\, t
 he downscaled data shows increased snowmelt and reduced snowfall\, leading
  to up to 10% lower FAC at high resolution. Overall\, we found that the hi
 gh-resolution FAC aligns better with the observations in areas with comple
 x topographies. Surprisingly\, the temporal resolution of the input data h
 as a larger influence on the FAC than previously expected: the absence of 
 a daily cycle in the downscaled input data increased the FAC by up to 20% 
 compared to earlier simulations that included a daily cycle. During my PhD
 \, I will further investigate the sensitivity of the model to forcings wit
 h different temporal resolution.
LOCATION:BAS Seminar Room 1 and Zoom
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