continental ice sheet - greenland alpine ice- valley glacier(s)
Post on 21-Dec-2015
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TRANSCRIPT
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CONTINENTAL ICE SHEET - GREENLAND
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ALPINE ICE- VALLEY GLACIER(S)
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GLACIER BAY, ALASKA
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ALL GLACIERS HAVE TWO ZONES
ACCUMULATION = + MASSABLATION = - MASS
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“Firn Line” = Equilibrium Line
Italian alps
Dinwoody Glacier. Wind River Range, Wyoming.
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GAME OF MASS BALANCE
SNOW IN vs WATER/ICE OUT
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IDEALIZED MOTION- CROSS SECTION
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= strain rate
A = constant related to ice temperature
= basal shear stress (?)
n = exponent with an average value of 3
GLEN’S FLOW LAW
gh sin
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TEMPERATURE MATTERS
Does cold or warm ice strain more
rapidly?
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STRESS-STRAIN RESPONSE
(WATER)
(DEBRIS FLOW)
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MASS FLUX - BIRD’S EYE VIEW
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VELOCITY DISTRIBUTION - BIRD’S EYE
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VELOCITY IN SECTION VIEW
WHAT’S GOING ON AT THE BED????
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WHAT IS THE TEMPERATUR
E AT THE BASE OF THE
ICE?
-GEOTHERMA
L-FRICTION-AMBIENT
AIR
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WARM BASED ICE
sliding along bed
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FOX GLACIER, New Zealand
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COLD-BASED ICE
frozen to bed
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DRY VALLEY AREA-- ANTARTICA
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COMPARE, WARM VS COLD
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UIMPLICATIONS FOR EROSION
INTENSITY
CLASSIC U-SHAPED VALLEY
EROSION REQUIRES
WARM BASED ICE,
WHY?
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PLUCKING….
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PLUCKING IN ACTION
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ABRASION -STRIATIONS AND POLISH
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ABRASION TAKES TOOLS
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“THE DIRT
MACHINE”
GLACIERS AS A CONVEYOR BELT
FOR ROCK DEBRIS
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WHERE DOES ERODED MATERIAL GO?
MORAINE FORMATIONINDICATES A STILL STAND
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MORAINES
LATERAL
LATERA
L
TERMINAL
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Frans Joseph Glacier - Tom Lowell
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MASSIVE COASTAL
MORAINES
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MORAINES ARE SCARCE IN INTERIOR NEW ENGLAND --
IMPLIES RAPID, DYNAMIC ICE MARGIN RETREAT (KOTEFF
AND PESSL)
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OUTWASH PLAINS FROM WATER CARRIED DEBRIS
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PRESENT DAY OUTWASH -- MT COOK
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SEDIMENT DELIVERY TO ICE MARGINAL LAKES
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LAKE SEDIMENTS
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TASMAN GLACIER
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TILL - NOT WELL
WASHED BY WATER
BASAL VS MELTOUT
SIERRA NEVADA, ALPINE
CENTRAL MASS, CONTINENTAL
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ESKER
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DRUMLIN - STREAMLINED FEATURE
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KETTLED TERRAIN
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KETTLE FORMING TODAY
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