penultimate deglacial sea level timing from u/th dating of tahitian corals alex l. thomas, gideon m....
TRANSCRIPT
![Page 1: Penultimate deglacial sea level timing from U/Th dating of Tahitian corals Alex L. Thomas, Gideon M. Henderson, Pierre Deschamps, Yusuke Yokoyama, Andrew](https://reader036.vdocuments.mx/reader036/viewer/2022070306/5518b559550346a61f8b50cc/html5/thumbnails/1.jpg)
Penultimate deglacial sea level timing from U/Th dating
of Tahitian corals
Alex L. Thomas, Gideon M. Henderson, Pierre Deschamps, Yusuke Yokoyama, Andrew J. Mason, Edouard Bard, Bruno Hamelin, Nicolas Durand, and Gilbert Camoin
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Outline
• TII Timing• IODP Expedition 310 “Tahiti Sea
Level”• My Results
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Testing Milankovich’s Hypothesis…
LGM 21 kaNow 0 kaICE-5G Peltier 2004
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…with Absolute Chronology
Broecker & van Donk 1970
12 ka
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Controversy Surrounding the Timing of Termination II
• Direct U/Th dating of marine sediments.
• Timing of TII too early to have same phasing as TI with respect to NHI.
• Dating 18O Terminations in speleothems is not sea level
• Highstand coral ages also constrain timing.
Henderson & Slowey 2002
Thompson & Goldstein
2006 Open system
corrected coral ages
128 ka
100 150Age ka
De
pth
mb
sl
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1018 S
17.75 S
150 W149 W
FaaaM0019M0020
TiareiM0009
MaraaM0005
18°S
149°
W
Tahiti
IODP Expedition 310
• Objectives of Exp 310 to constrain postglacial: sea level rise; SSTs; and reef geometry response.
• Of 37 holes, 28 penetrated Pre-LGM material
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The Most Recent Deglaciation
IODP EXP325 GBREC
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Deschamps et al. in prep
MWP-1ABarbadosStanford et al 2006
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
![Page 8: Penultimate deglacial sea level timing from U/Th dating of Tahitian corals Alex L. Thomas, Gideon M. Henderson, Pierre Deschamps, Yusuke Yokoyama, Andrew](https://reader036.vdocuments.mx/reader036/viewer/2022070306/5518b559550346a61f8b50cc/html5/thumbnails/8.jpg)
Is there a dipstick for sea level?
Milne & Mitrovica 2008 QSR
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130
110
90
70
50
30
10
-10
125 130 135 140 145 150 155
130
110
90
70
50
30
10
-10
Age (ka)
)lsbm(noitaveledetcurtsnoceR
Stein 1993, Esat 1999
Stirling 1995, 1998
Eisenhauer 1996
Szabo 1994
Thompson 2003
Bard 1990, Gallup 2002
Huon Peninsula
W.Australia
Barbados
Hawaii
Termination II coral data
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130
110
90
70
50
30
10
-10
125 130 135 140 145 150 155
130
110
90
70
50
30
10
-10
Age (ka)
)lsbm(noitaveledetcurtsnoceR
Stein 1993, Esat 1999
Stirling 1995, 1998
Eisenhauer 1996
Szabo 1994
Thompson 2003
Bard 1990, Gallup 2002
Huon Peninsula
W.Australia
Barbados
Hawaii
Robust U/Th ages
U/Th alteration
This Study
New data from IODP Exp 310
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130
110
90
70
50
30
10
-10
125 130 135 140 145 150 155
130
110
90
70
50
30
10
-10
Age (ka)
)lsbm(noitaveledetcurtsnoceR
731
latest time by whichsea level rose to 85 mbsl
Stein 1993, Esat 1999
Stirling 1995, 1998
Eisenhauer 1996
Szabo 1994
Thompson 2003
Bard 1990, Gallup 2002
Huon Peninsula
W.Australia
Barbados
Hawaii
Robust U/Th ages
U/Th alteration
This Study
Timing constraint
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Fit timing of continuous records to coral chronology
130
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125 130 135 140 145 150 155
130
110
90
70
50
30
10
-10
Age (ka)
)lsbm(noitaveledetcurtsnoceR
731
241
latest time by whichsea level rose to 85 mbsl
start of deglaciation?
Stein 1993, Esat 1999
Stirling 1995, 1998
Eisenhauer 1996
Szabo 1994
Thompson 2003
Bard 1990, Gallup 2002
Huon Peninsula
W.Australia
Barbados
Hawaii
Bintanja 2005+4.5 ka
Robust U/Th ages
U/Th alteration
This Study
Continuous sea levelwith adjusted timing
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An Alternative Sea Level Curve
130
110
90
70
50
30
10
-10
125 130 135 140 145 150 155
130
110
90
70
50
30
10
-10
Age (ka)
)lsbm(noitaveledetcurtsnoceR
731
241
latest time by whichsea level rose to 85 mbsl
start of deglaciation?
Stein 1993, Esat 1999
Stirling 1995, 1998
Eisenhauer 1996
Szabo 1994
Thompson 2003
Bard 1990, Gallup 2002
Huon Peninsula
W.Australia
Barbados
Hawaii
Bintanja 2005+4.5 ka
Siddall 2006+2.5 ka
Robust U/Th ages
U/Th alteration
This Study
Continuous sea levelwith adjusted timing
![Page 14: Penultimate deglacial sea level timing from U/Th dating of Tahitian corals Alex L. Thomas, Gideon M. Henderson, Pierre Deschamps, Yusuke Yokoyama, Andrew](https://reader036.vdocuments.mx/reader036/viewer/2022070306/5518b559550346a61f8b50cc/html5/thumbnails/14.jpg)
Insolation Forcing of Sea Level Rise
Fuji 18O
N. Atlantic 18O
Northern H Summer
Southern H Summer
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Timing of sea level rise is not out of phase with CO2
CO2 Fuji
CO2 Vostok
18Oatm Vostok
All Ice-core data are on the Dome Fuji timescale of Kawamura et al 2007
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130
110
90
70
50
30
10
-10
125 130 135 140 145 150 155
130
110
90
70
50
30
10
-10
Age (ka)
)lsbm(noitaveledetcurtsnoceR
731
241
latest time by whichsea level rose to 85 mbsl
start of deglaciation?
Stein 1993, Esat 1999
Stirling 1995, 1998
Eisenhauer 1996
Szabo 1994
Thompson 2003
Bard 1990, Gallup 2002
Huon Peninsula
W.Australia
Barbados
Hawaii
Bintanja 2005+4.5 ka
Siddall 2006+2.5 ka
Robust U/Th ages
U/Th alteration
This Study
Continuous sea levelwith adjusted timing
Can we get more from the corals?
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Drowning of Reefs
IODP EXP325 GBREC
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Deschamps et al. in prep
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
![Page 18: Penultimate deglacial sea level timing from U/Th dating of Tahitian corals Alex L. Thomas, Gideon M. Henderson, Pierre Deschamps, Yusuke Yokoyama, Andrew](https://reader036.vdocuments.mx/reader036/viewer/2022070306/5518b559550346a61f8b50cc/html5/thumbnails/18.jpg)
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130
110
90
70
50
30
10
-10
125 130 135 140 145 150 155
130
110
90
70
50
30
10
-10
Age (ka)
)lsbm(noitaveledetcurtsnoceR
731
241
latest time by whichsea level rose to 85 mbsl
start of deglaciation?
Stein 1993, Esat 1999
Stirling 1995, 1998
Eisenhauer 1996
Szabo 1994
Thompson 2003
Bard 1990, Gallup 2002
Huon Peninsula
W.Australia
Barbados
Hawaii
Bintanja 2005+4.5 ka
Siddall 2006+2.5 ka
Robust U/Th ages
U/Th alteration
Paleo-depth estimate
This Study
Continuous sea levelwith adjusted timing
Paleodepths suggest a fall in sea level during the
deglaciation
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Widespread evidence of millennial–scale lowstand
Esat et al 1999 (PNG)
Siddall et al 2006 (Red Sea)
Andrews et al 2007 (Gulf of Corinth)
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Conclusions
• Expedition 310 “Tahiti Sea Level” has been a great success, for drilling operations and for science
• Sea level rise at the penultimate deglaciation was early with respect to phasing with NHI seen at TI
• Sea level, and CO2, rise are not out of phase.
• There is a substantial fall in global sea level during the penultimate deglaciation, indicating a readvance of ice sheets during a period of CO2 rise and warming.
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Effect of GIA on Timing
Early Late
Initial rise starts synchronously
EarlyLate
Milne & Mitrovica 2008 QSR
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Source of MWP-1A