what do paleoclimate. records tell us about. wais stability? what do west antarctic ice cores say...
TRANSCRIPT
![Page 1: What do Paleoclimate. records tell us about. WAIS stability? What Do West Antarctic Ice Cores Say About Rapid Ice Flow? Ken Taylor Richard Alley Ed Brook](https://reader036.vdocuments.mx/reader036/viewer/2022070415/56649e975503460f94b9aab3/html5/thumbnails/1.jpg)
What do Paleoclimate . records tell us about . WAIS stability?
What Do West Antarctic Ice Cores Say About Rapid Ice Flow?
Ken TaylorRichard AlleyEd BrookHoward Conway Jeff Severinghaus Paul Mayewski Jim White
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Byrd vs SDM
White & Brook
Warmer
Colder
![Page 3: What do Paleoclimate. records tell us about. WAIS stability? What Do West Antarctic Ice Cores Say About Rapid Ice Flow? Ken Taylor Richard Alley Ed Brook](https://reader036.vdocuments.mx/reader036/viewer/2022070415/56649e975503460f94b9aab3/html5/thumbnails/3.jpg)
Byrd vs SDM
White & Brook
Warmer
Colder
![Page 4: What do Paleoclimate. records tell us about. WAIS stability? What Do West Antarctic Ice Cores Say About Rapid Ice Flow? Ken Taylor Richard Alley Ed Brook](https://reader036.vdocuments.mx/reader036/viewer/2022070415/56649e975503460f94b9aab3/html5/thumbnails/4.jpg)
Byrd vs SDM
White & Brook
15 ka
22 ka
Warmer
Colder
![Page 5: What do Paleoclimate. records tell us about. WAIS stability? What Do West Antarctic Ice Cores Say About Rapid Ice Flow? Ken Taylor Richard Alley Ed Brook](https://reader036.vdocuments.mx/reader036/viewer/2022070415/56649e975503460f94b9aab3/html5/thumbnails/5.jpg)
Byrd vs SDM
White & Brook
Warmer
Colder
![Page 6: What do Paleoclimate. records tell us about. WAIS stability? What Do West Antarctic Ice Cores Say About Rapid Ice Flow? Ken Taylor Richard Alley Ed Brook](https://reader036.vdocuments.mx/reader036/viewer/2022070415/56649e975503460f94b9aab3/html5/thumbnails/6.jpg)
Gas records
kkks
Must be local change at Siple Dome because:
1) Change does not show up at Byrd
2) Proxies of distant climate (Dexcess and chemistry) do not show significant changes
Siple Dome Records
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Gas records
kkks
Must be local change at Siple Dome because:
1) Change does not show up at Byrd
2) Proxies of distant climate (Dexcess and chemistry) do not show significant changes
Siple Dome Records
Disrupted stratigraphy
![Page 8: What do Paleoclimate. records tell us about. WAIS stability? What Do West Antarctic Ice Cores Say About Rapid Ice Flow? Ken Taylor Richard Alley Ed Brook](https://reader036.vdocuments.mx/reader036/viewer/2022070415/56649e975503460f94b9aab3/html5/thumbnails/8.jpg)
Regional Climate Change:Would see something at Byrd and in other climate proxies from SDM.
![Page 9: What do Paleoclimate. records tell us about. WAIS stability? What Do West Antarctic Ice Cores Say About Rapid Ice Flow? Ken Taylor Richard Alley Ed Brook](https://reader036.vdocuments.mx/reader036/viewer/2022070415/56649e975503460f94b9aab3/html5/thumbnails/9.jpg)
Regional Climate Change:Would see something at Byrd and in other climate proxies from SDM.
Mishandling of Core: Gas record/Deuterium record offset is correct
![Page 10: What do Paleoclimate. records tell us about. WAIS stability? What Do West Antarctic Ice Cores Say About Rapid Ice Flow? Ken Taylor Richard Alley Ed Brook](https://reader036.vdocuments.mx/reader036/viewer/2022070415/56649e975503460f94b9aab3/html5/thumbnails/10.jpg)
Regional Climate Change:Would see something at Byrd and in other climate proxies from SDM.
Mishandling of Core: Gas record/Deuterium record offset is correct
Folded Stratigraphy:No suitable ice to fold into record
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Regional Climate Change:Would see something at Byrd and in other climate proxies from SDM.
Mishandling of Core: Gas record/Deuterium record offset is correct
Folded Stratigraphy:No suitable ice to fold into record
Ice Flow Overrode Siple DomeChange in record is too abruptNo other ice with right characterisitics
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Regional Climate Change:Would see something at Byrd and in other climate proxies from SDM.
Mishandling of Core: Gas record/Deuterium record offset is correct
Folded Stratigraphy:No suitable ice to fold into record
Ice Flow Overrode Siple DomeChange in record is too abrupt
![Page 13: What do Paleoclimate. records tell us about. WAIS stability? What Do West Antarctic Ice Cores Say About Rapid Ice Flow? Ken Taylor Richard Alley Ed Brook](https://reader036.vdocuments.mx/reader036/viewer/2022070415/56649e975503460f94b9aab3/html5/thumbnails/13.jpg)
Interpretation 1: Elevation of Siple Dome Changed Lapse Rate
22 ka B.P. 6oC warming, ~200 years 600 m elevation decrease at SDM
15 ka B.P.3.5oC warming < 1,000? years350 m elevation decrease at
SDM
Ice Flow Modeling: Rapid 350 m decrease of Siple Dome
at 15 ka (Price et. al., 2007)
Atmospheric Modeling: Elevation of ice streams has large influence on temperature at Summit of Siple Dome(Monaghan & Bromwich, 2006)
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Interpretation 1: Elevation of Siple Dome Changed Lapse Rate
22 ka B.P. 6oC warming, ~200 years 600 m elevation decrease at SDM
15 ka B.P.3.5oC warming < 1,000? years350 m elevation decrease at
SDM
Ice Flow Modeling: Rapid 350 m decrease of Siple Dome
at 15 ka (Price et. al., 2007)
Atmospheric Modeling: Elevation of ice streams has large influence on temperature at Summit of Siple Dome(Monaghan & Bromwich, 2006)
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Interpretation 2: Elevation of Ice Streams Changed Air Flow Changed
Atmospheric Modeling: Elevation of ice streams has large influence on temperature at Summit of Siple Dome (Monaghan & Bromwich, 2006)Ice Sheet Model: Siple Dome was a bump (Dave Pollard)
SDMSDM
BYRDBYRD
Current situation Paleo situation
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Some combination of:1) Changes in SDM surface elevation . (lapse rate)
2) Changes in ice stream elevation . (air flow patterns/katabatic winds)
At 15 ka and 22 ka there were large and rapid drawn downs of ice on the Siple Coast.
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What caused ice draw down?
Sea level rise
Sub-ice flood
Ice shelf collapse
Ice stream internal dynamics
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• ocean Explaination
Siple: White et al
Sea Level
The Siple Dome events precede the step increases in sea level.
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What caused ice draw down?
Sea level rise
Sub-ice flood
Ice shelf collapse
Ice stream internal dynamics
![Page 20: What do Paleoclimate. records tell us about. WAIS stability? What Do West Antarctic Ice Cores Say About Rapid Ice Flow? Ken Taylor Richard Alley Ed Brook](https://reader036.vdocuments.mx/reader036/viewer/2022070415/56649e975503460f94b9aab3/html5/thumbnails/20.jpg)
`Eastern Ross SeaMosola & Anderson, 2006
Slope Gullies
Sub-ice water system
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What caused ice draw down?
Sea level rise
Sub-ice flood
Ice shelf collapse
Ice stream internal dynamics
![Page 22: What do Paleoclimate. records tell us about. WAIS stability? What Do West Antarctic Ice Cores Say About Rapid Ice Flow? Ken Taylor Richard Alley Ed Brook](https://reader036.vdocuments.mx/reader036/viewer/2022070415/56649e975503460f94b9aab3/html5/thumbnails/22.jpg)
• MAP SHOWING
• Tdome, SDM, BYRD, Moulton, OCEAM COres
Roosevelt Island
RossIce Shelf
Siple Dome
http://lima.usgs.gov/access.php
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• MAP SHOWING
• Tdome, SDM, BYRD, Moulton, OCEAM COres
Roosevelt Island
RossIce Shelf
Siple Dome
http://lima.usgs.gov/access.php
![Page 24: What do Paleoclimate. records tell us about. WAIS stability? What Do West Antarctic Ice Cores Say About Rapid Ice Flow? Ken Taylor Richard Alley Ed Brook](https://reader036.vdocuments.mx/reader036/viewer/2022070415/56649e975503460f94b9aab3/html5/thumbnails/24.jpg)
Water Temperature
Ice ShelfThickness
Bathymetry Siple and ShiraseCoasts are most vulnerable
David Holland
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Water Temperature
Ice ShelfThickness
Bathymetry Siple and ShiraseCoasts are most vulnerable
David Holland
![Page 26: What do Paleoclimate. records tell us about. WAIS stability? What Do West Antarctic Ice Cores Say About Rapid Ice Flow? Ken Taylor Richard Alley Ed Brook](https://reader036.vdocuments.mx/reader036/viewer/2022070415/56649e975503460f94b9aab3/html5/thumbnails/26.jpg)
Water Temperature
Ice ShelfThickness
Bathymetry Siple and ShiraseCoasts are most vulnerable
David Holland
![Page 27: What do Paleoclimate. records tell us about. WAIS stability? What Do West Antarctic Ice Cores Say About Rapid Ice Flow? Ken Taylor Richard Alley Ed Brook](https://reader036.vdocuments.mx/reader036/viewer/2022070415/56649e975503460f94b9aab3/html5/thumbnails/27.jpg)
Water Temperature
Ice ShelfThickness
Bathymetry Siple and ShiraseCoasts are most vulnerable
David Holland
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`Eastern Ross SeaMosola & Anderson, 2006
Iceberg furrows at 650 mNo sub-ice shelf deposits
Rapid retreat of grounded ice
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• MAP SHOWING
• Tdome, SDM, BYRD, Moulton, OCEAM COres
Roosevelt Island
RossIce Shelf
Siple Dome
http://lima.usgs.gov/access.php
![Page 30: What do Paleoclimate. records tell us about. WAIS stability? What Do West Antarctic Ice Cores Say About Rapid Ice Flow? Ken Taylor Richard Alley Ed Brook](https://reader036.vdocuments.mx/reader036/viewer/2022070415/56649e975503460f94b9aab3/html5/thumbnails/30.jpg)
What caused ice draw down?
Sea level rise
Sub-ice flood
Ice shelf collapse
Ice stream internal dynamics
![Page 31: What do Paleoclimate. records tell us about. WAIS stability? What Do West Antarctic Ice Cores Say About Rapid Ice Flow? Ken Taylor Richard Alley Ed Brook](https://reader036.vdocuments.mx/reader036/viewer/2022070415/56649e975503460f94b9aab3/html5/thumbnails/31.jpg)
Siple Coast ice had large and rapid changes at 15 ka and 22 ka
Basal floodingBreak up of a portion of the Ross Ice ShelfIce stream internal dynamics
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Amanda Mosola & John Anderson
Andy Monaghan, Dave Brom