What do glaciers tell us when they growl
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Transcript of What do glaciers tell us when they growl
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WHAT DO GLACIERS TELL US WHEN THEY GROWL?
BY
Robert Denis
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HOW OLD AM I?
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FROM SNOW TO GLACIER ICE
Snow Ice Glacier ice
Glacier icecrystals
A continuum
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Features of a glaciated landscape (Gibbs Fjord, Baffin Is.)
HORN
SNOW FIELDCIRQUE
ARÊTES
ICE-FALLS
MEDIAL MORAINE
LATERAL MORAINE
AVALANCHE
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Major Features:
Icecap Glacier
Moraine
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U shaped valleys, and cirques Evighets Fjord, Greenland
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Cirques in Hebron Fjord, Labrador
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Bucchan Fjord, Truncated Spurs
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1900 limit
Icecap
Glacier Bed
U shaped valley
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A FEW MORE DETAILS!
GLACIAL DEBRIS ON OCEAN FLOOR ICEBERGS
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Major Features of a glacier tongue:
U shaped valleys
Frontal moraine
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Evidence of glacial retreat since ~1900
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Glacier snout Evighets Fjord
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BUCCHAN FJORD, BAFFIN ISLAND
Lateral Moraine
Snow line
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Bucchan Gulf
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Sea level changes in the last ~500 years
Radstock Bay, Devon Island
As it was in the 14-15th century
Thule sites
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Sea level changes in the last ~500 years
Thule sites
Radstock Bay, Devon Island
As it is now
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An ARCHIVE of our PAST
Scientists at work on an Ellesmere Ice Cap
Playing in the snow
Ice core with layers
Vostock Core
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An example of climate change
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Where do icebergs come from?The Ilulissat Icefjord
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WHY DID THE TITANIC SINK?
12%
“I DON’T CARE WHO YOU ARE, I AIN’T MOVING”
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FROM ‘ICEBERG ALLEY’ EAST BAFFIN COAST
Magnificent sculptures to dream about
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THE CASE OF GREENLAND
~3000 m. of ice
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1992 2002
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….and with no ice
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1980 1990 2000 2010 2020 2030 2040 2050
2080
4
3
2
1
0
Maslowski et al. 2005
Holland et al. 2007
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HOW OLD AM I?
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KR =photo by Kerry Rodriguez 2003
THANK YOU VERY MUCH
Merci beaucoup
Robert
et
Grand’papaKR
NAW KOH RAMI