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Organics at 40 o S (D357) Maite Hernández/Rich Pancost.

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Presentation on theme: "Organics at 40 o S (D357) Maite Hernández/Rich Pancost."— Presentation transcript:

1 Organics at 40 o S (D357) Maite Hernández/Rich Pancost

2 PHYTOPLANKTON BIOMARKERS C 37 -C 39 Ethyl and methyl ketones: Alkenones Brassicasterol 24-methylcholesta-5,24(28)-dien- 3β-ol cholesta-5,22-dien-3β-ol 24-ethylcholesta-5,24(28)-dien-3β-ol 24-propylcholesta-5,24(28)-dien-3β-ol Prasinophyceae Crysophyceae

3 Source organism Preserved + = Paleo proxy calibration Paleo Proxy

4 Is PP reflected in underlying sediments? Lipid distributions reflect productivity variations (Lee and Wakeham, 1988; Hernández-Sánchez et al., 2010). Coccolithophorids Diatoms Alkenones Sterols

5 Paleo proxy calibration Is PP reflected in underlying sediments?: Potential for community assemblage proxy Source organism Preserved + = Paleo Proxy

6

7 Biomarker distributions in Surface waters

8 Biomarker distributions in deep waters

9 Biomarker distributions in Surface sediments

10 Why so different? Seasonal bias Degradation - Hardman-Mounford et al. (2003) chl- a data: weak seasonality at St. 6 and St. 11

11 Vertical Fluxes 230 Th xs

12 Summary - Biomarker distributions in upper water column suggests homogeneous productivity - Distributions strikingly different in sediments - Most degradation occurs throughout the water column and/or sediment-water interface - Alkenones, hydroxy methyl alkanoates and diols seem to be the most diagenetically stable. - Subtle differences in [O 2 ] seem to have an effect on preservation

13 To do … Biomarker distributions represent community structure in surface waters. –Heather Bounman and Tom Estimate vertical fluxes. –Gideon Henderson and Alex Thomas

14 Paleo proxy calibration Is PP reflected in underlying sediments?: - Hernandez-Sanchez et al. (Pancost, Henderson, Homoky, Bounman, Thomas +). GCA? GDGT distributions in the water column: Implications for the TEX 86 paleothermometry proxy - Hernandez-Sanchez, M. T., Woodward, M., Taylor, K. W., Henderson, G., Pancost, R. D., GDGT distributions in SE Atlantic sediments match those in subsurface waters: Geology (to be submitted)

15 Other outcomes Hernandez-Sanchez, M. T., and Pancost, R. D. Occurrence of 1-O-monoalkyl glycerol ether lipids in both marine waters and sediments (in prep.)

16 Thanks for your attention!

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