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TRANSCRIPT
TROMSØ 8 MAY, 2018
E. DareliusA. Wåhlin, S. Kimura, N. Steiger, T. Hattermann, L. Vignes, J.B. Sallée, S.H. Lee, T.W.
Kim, A. Jenkins, M. Schröder, K. Daae
TOBACO:TOPOGRAPHIC BARRIERS CONTROLLING WARM
WATER INFLOW AND ANTARCTIC ICE SHELF MELTING
Antarctic ice shelves are melting at an accelerating rate
2Pritchard et al, 2012; Paolo et al, 2015; Rignot et al, 2011.
Oceanic currents tend to follow depth contours, i.e. warm water flows ALONG the continental slope
- so how does the warm water get onto the continental shelf and into the ice shelf cavities??
Schoof, 2010
TOBACO
› Flow across the shelfbreak
› Flow across the ice shelf front
1. Laboratory experiment (poster)
2. Fieldwork and observations
3. Numerical modelling
4
TOBACO
› Flow across the shelfbreak
› Flow across the ice shelf front
1. Laboratory experiment (poster)
2. Fieldwork and observations
3. Numerical modelling
5
TOBACO
› Flow across the shelfbreak
› Flow across the ice shelf front
1. Laboratory experiment (poster)
2. Fieldwork and observations
3. Numerical modelling
6
1. Laboratory experiments
7
??
?
How much water is going where and how does that depend on the
parameters of the flow and thebathymetry?
Financed through EU Hydralab +
2. ObservationsOceanic moorings, Hydrographic profiles and APRES (meltrates)
8
Supposed to be
Recovered 2019 -but currently no ship…
/ UNI
‘’Shelfbreak - trough’’
‘’Ice shelf front’’
3. High-resolution regional and idealized modelling 17W hydrographic climatology from seals and ship based CTD Hattermann, submitted
metROMS regional800 m grid (Akvaplan-niva)
Nested into 1/4o
Circumpolarhindcast(Naughten et al. 2018)
Geophysical Institute – Unversity of Bergen
Thank you!