Thanablationmassbalanceopposite

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Unformatted text preview: ’ll
discuss
this
next
 
 Q:
why
else
might
the
temperature
of
a
glacier
matter?
 ‐temperature
influences
how
deformable
the
ice
is
 ‐also
temperate
ice
can
contain
water
in
between
the
ice
crystals
also
allowing
for
greater
deformation
 
 Glacier
Movement
 ‐is
often
quite
slow
(even
the
fastest
glaciers
move
at
~10s
of
km/yr)
 ‐in
time
lapse
you
can
see
motion
more
clearly
(waterline
movie)
 
 Q:
what’s
causing
the
ice
to
move?
 ‐basal
sliding
(this
is
why
the
temperate
glacier
is
rounded…it’s
sliding
at
the
base
which
precludes
 formation
of
a
steep
cliff)
 ‐deforms
under
its
own
weight
 
 Internal
Deformation
 ‐when
thick
enough
ice
will
begin
to
deform
under
gravity
due
to
the
great
weight
of
the
overlying
ice
 ‐
under
stress
crystals
change
orientation
so
that
they
become
aligned
–this
allows
them
to
move
more
 easily
because
they
are
more
like
a
deck
of
cards
 ‐flow
occurs
through
movement
within
ice
crystals
which
are
deformed
under
stress

 ‐they
deform
in
the
direction
of
applied
stress
just
like
a
deck
of
cards

 
 
 ‐these
processes
are
typically
restricted
to
the
base
of
the
glacier
because
that’...
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