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CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:A new continuum rheological model for the deformat
ion and drift of sea ice - Veronique Dansereau (CN
RS (Centre national de la recherche scientifique))
DTSTART;TZID=Europe/London:20170911T140000
DTEND;TZID=Europe/London:20170911T143000
UID:TALK78682AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/78682
DESCRIPTION:Co-authors: Pierre Saramito (CNRS-LJK)\, Jé\
;rô\;me Weiss (CNRS-ISTerre)\, Philippe Latte
s (Total S.A. E&P)
Axel Roy (1)
V&eacut
e\;ronique Dansereau (2)*
Jé\;rô\;m
e Weiss (2)  \;
Christian Haas (3)
Matt
hieu Chevalier (4)
1 \;
É\;cole Nationale de la Mé\;té\;
orologie\, Mé\;té\;o France\, Toulouse
\, France
2 Institut des Sciences de la Terre\
, CNRS UMR 5275\, Université\; de Grenoble\,
Grenoble\, France
3 Alfred Wegener Institute\
, Bremerhaven\, Germany
4 CNRM/GMGEC/IOGA M&ea
cute\;té\;o France\, Toulouse\, France
<
span>
Sea ice models are
most often compared to each other and to observati
ons in terms of the spatial distribution of the si
mulated ice thickness. An equally important\, and
perhaps more appropriate\, metric to investigate t
he mechanical behaviour of the sea ice cover is th
e ice thickness distribution\, i.e.\, the p
robability density function\, of which some valuab
le information have been available for some time f
rom drill-hole\, upward looking submarine-mounted
sonar (USL) and airborne electromagnetic (EM) soun
ding measurements.
An important issue naturally arises when
comparing sea ice thickness distributions based on
measurements made at the meter scale with that es
timated from regional and global sea ice model sim
ulations\, with a typical resolution of a few kilo
metres\; the issue of scale dependance. Using USL
sea ice draft profiles and EM thickness measuremen
ts\, we investigate the scaling properties of the
sea ice thickness over the Arctic to address the f
ollowing question: how does the sea ice thickness
distribution evolve with the scale of observation?
The autocorrelation calcu
lations performed here allow extending previous an
alyses based on single USL transects (up to 50 km-
long) and point to long-range correlations in the
thickness of the sea ice cover reaching as far as
a few hundreds of kilometres. Multi-fractal analys
es are conducted to investigate the variability of
the the ice thickness distribution with the spati
al scale of observation up to these scales.
LOCATION:Seminar Room 1\, Newton Institute
CONTACT:INI IT
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