[And, we note the appearances of former climate scientist hunks of the month Jason Box and Alun Hubbard!]
by Peter Sinclair, Yale Climate Forum, September 11, 2014
Link: https://www.youtube.com/watch?v=_PEi0Retg8A
Transcript
0:05
in the last 11 years we have a high-quality satellite measurements
0:10
love the mass a Greenland and Antarctic ice
0:14
and it shows a doubling the
0:17
mass loss rate in the past decade
0:20
way
0:21
the
0:28
and new data from the European Space Agency's krauss admission
0:35
shows that the Greenland ice sheet equal to 22 feet above sea level rising
0:39
has more than doubled its meltwater output in the last five years
0:43
your across the surface in the shower she
0:47
is rampant and idk
0:50
causing I'm told damage to basically I sheet
0:54
and it's doing math in deep interior regions that never before
1:00
not least in the last ten thousand years have
1:05
been susceptible to that woman in early August
1:09
the short summers dwindling and South West Greenland no longer gets twenty
1:13
four hours of sunlight
1:15
descending into in erie Twilight for several hours each night
1:18
streams lakes and ponds that cover the surface during sunny hours
1:23
slow their flow begin to free I'll
1:29
when sunshine returns strongly the melting process begins again
1:33
head
1:41
in areas where Dustin algae dark and the snow the process is even more rapid
1:47
and streams quickly returned to rush in Torrance
1:50
doing
2:03
across the a sheep thousands and nameless short-lived lakes
2:07
dot the landscape Mike
2:11
lakes have been forming higher up on the inland I she'd
2:15
the lakes can be nine square kilometers in area
2:18
in a form all over the ice sheet many thousands of them
2:22
and these have been increasing in number and in areas
2:26
because that their dark color the absorb sunlight there like big solar collectors
2:32
good
2:35
one of the most striking can has it is features at the Greenland ice sheet
2:39
are the places where rushing water plunges deep into the ice
2:43
called Moreland's after the French word for male
2:46
and at these points
2:50
not water with all its story he'd penetrates deep into the a sheet
2:54
and is now Terios expand delivers want two regions that have been frozen solid
2:59
for many millennia
3:00
this morn
3:04
is large enough to swallow a school bus I'll
3:10
dramatic event that occurs with many of the lakes
3:13
is the drain abruptly sending an enormous volume of water down
3:18
into the ice sheet spreading out at the bed
3:22
lubricating eye she flow producing
3:25
dramatic fast acceleration said
3:30
this increasing supply have no water draining into the icy
3:35
is adding heat to the ice which softens the ice
3:39
leading it to low faster under its own way meltwater continues to flow
3:47
in some areas reaching a calving front
3:50
good giant glacier walls push icebergs relentlessly into the sea
3:54
in good
4:00
in the meltwater thats jetting out
4:03
under the front a marine terminating glaciers like a Jacuzzi
4:07
forces heat exchange with the warmer sea water
4:11
that melts and undercuts Glacier Point promoting
4:14
icebergs having our my
4:20
and that produces a an instant flow acceleration because that's less flow
4:25
resistance
4:26
when Burk's break off so that the direct connection between
4:30
meltwater and flow speed at the glacier front
4:34
as the greater flows faster the cracks there crevasses they
4:38
they open up morale allowing more water to drain and
4:41
in this process we call
4:46
Hydra fracture that water acting under gravity
4:49
actually helps the cracks open up faster
4:53
this further promotes flow speed
4:57
increase at every stage in the process
5:00
the flow not water reinforces the other stages
5:04
in a vicious cycle that accelerates loss advice
5:07
it would glaciologist call a positive feedback
5:11
accelerating ice loss in ways that scientists have only recently begun to
5:16
quantify
5:18
Greenland sea level contribution
5:21
10 years ago was half a millimeter per year ten years later it's one millimeter
5:26
period it's expected that that
5:29
loss rate will continue to double it with
5:33
periodo somewhere between five and
5:36
and 12 years so the next decade Greenland's losing two millimeters per
5:41
year
5:42
the next decade four millimeters per year the next decade
5:46
8 millimeters per year you take that to the end of the century
5:50
and in the agreement I see is
5:53
yielding about and one meter
5:56
above sea level just from Greenland
5:59
I'm so the mean sea level
6:02
projections the recently been published by
6:06
the IPCC are very likely underestimates because
6:10
they don't contain all of the
6:13
the process ease in the models that are used to make these projections
6:22
I'll day
6:25
the
6:35
ruling the meeting
6:45
the morning
6:50
in
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