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Foraminifera, Isotopes and Paleoclimate Signals
Shannon Valley EAS 4480 April 23, 2015
Foraminifera, Isotopes and Paleoclimate Signals Shannon Valley EAS - - PowerPoint PPT Presentation
Foraminifera, Isotopes and Paleoclimate Signals Shannon Valley EAS - - PowerPoint PPT Presentation
Foraminifera, Isotopes and Paleoclimate Signals Shannon Valley EAS 4480 April 23, 2015 What are foraminifera? and what can they tell us? Isotope Ratios 18 O in forams: # T, $ 18 O 13 C in forams: # productivity, $
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…and what can they tell us?
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Isotope Ratios
δ18O in forams: #T, $δ18O δ13C in forams: #productivity, $δ13C
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Data and Methods
Core KNR 166-2 JPC 26 from the Florida Straits 3 benthic foram species: Cibicidoides pachyderma Planulina ariminesis Cibicides mollis Data include depth/age model, δ18O and δ13C Analyses: Linear Regression Correlation Coefficient Residual Analysis Polynomial Fits Time Series Analysis Is there a relationship between temperature and productivity evident in these species? Can we see evidence of past glaciations?
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Linear Regressions with Error Bounds
0.5 1 1.5 2 2.5
- 0.5
0.5 1 1.5 2
C pachyderma
1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8
C mollis 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 P ariminesis
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Correlating productivity and temperature
Species
- Corr. Coef.
P . ariminesis 0.6272
- C. mollis
0.4918
- C. pachyderma
0.5742
0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8
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Residual Analysis
0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 0.8 1 1.2 1.4 1.6 1.8 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6
Residual
- 0.6
- 0.4
- 0.2
0.2 0.4 0.6 0.8
1st order– P ariminensis Critical value Χ2 value 21.03 173.2
- 0.6
- 0.4
- 0.2
0.2 0.4 0.6 0.8 10 20 30 40 50 60 70
P arimenisis Regression Residual Distribution
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2nd Degree Polynomial Fits
0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
P ariminesis
1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3
- 0.2
0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8
C mollis 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6
- 0.6
- 0.4
- 0.2
0.2 0.4 0.6 0.8
P ariminesis
1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3
- 0.8
- 0.6
- 0.4
- 0.2
0.2 0.4 0.6
C mollis
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2nd Degree Polynomial Fits ¡
0.5 1 1.5 2 2.5 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
C pachyderma
0.5 1 1.5 2 2.5
- 0.8
- 0.6
- 0.4
- 0.2
0.2 0.4 0.6 0.8
C pachyderma
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P ariminesis Time Series
Age (yr BP)
#104 0.5 1 1.5 2 2.5 3 3.5 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6
Age (yr BP)
#104 0.5 1 1.5 2 2.5 3 3.5 0.6 0.8 1 1.2 1.4 1.6 1.8
Frequency (Hz) #10-3 1 2 3 4 5 6 7 8 Power 2 4 6 8 10 12 14 16 18 20 p = 0.001 p = 0.005 p = 0.01 p = 0.05 p = 0.1 p = 0.5 Power Spectrum for #; hifac=2; ofac=4.17,173 4293 3523 22,898 10,568 4432
Significant Periodicities (Yrs)
δ18O δ13C
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C mollis Time Series
Frequency (Hz) #10-3 0.5 1 1.5 2 2.5 Power 1 2 3 4 5 6 p = 0.1 p = 0.5 Power Spectrum for #; hifac=2; ofac=4.- 29,623 9875
6348
Significant Periodicities (Yrs)
δ18O δ13C
Age (yr BP)
#104 1 1.5 2 2.5 3 3.5
?18O?
1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3
Age (yr BP)
#104 1 1.5 2 2.5 3 3.5
?13C?
0.4 0.6 0.8 1 1.2 1.4 1.6
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C Pachyderma Time Series
Frequency (Hz) 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 0.009 0.01 Power 10 20 30 40 50 p = 0.001 p = 0.005 p = 0.01 p = 0.05 p = 0.1 p = 0.5 Power Spectrum for #; hifac=2; ofac=4.Age (yr BP)
#104 0.5 1 1.5 2 2.5 3 3.5
?18O?
0.5 1 1.5 2 2.5
Age (yr BP)
#104 0.5 1 1.5 2 2.5 3 3.5
?13C?
0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8
27,459 11,441 7268 5492 4291 3520 2214 1807 27,459 7226 5492 2921
- Significant Periodicities (Yrs)
δ18O δ13C
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