Blog Archive

Friday, September 12, 2014

ABSOLUTELY MUST SEE VIDEO OF GREENLAND WITH JASON BOX

Some startling fairly newly described positive (as in "not good") feedbacks in the melting process of Greenland's ice sheet and glaciers.

[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

No comments: