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Organics at 40 o S (D357)

Organics at 40 o S (D357). Maite Hernández/Rich Pancost. cholesta-5,22-dien-3 β - ol. 24-methylcholesta-5,24(28)-dien-3 β - ol. 24-ethylcholesta-5,24(28)-dien-3 β - ol. PHYTOPLANKTON BIOMARKERS. C 37 -C 39 Ethyl and methyl ketones: Alkenones. Brassicasterol. Prasinophyceae.

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Organics at 40 o S (D357)

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

  2. cholesta-5,22-dien-3β-ol 24-methylcholesta-5,24(28)-dien-3β-ol 24-ethylcholesta-5,24(28)-dien-3β-ol PHYTOPLANKTON BIOMARKERS C37-C39 Ethyl and methyl ketones: Alkenones Brassicasterol Prasinophyceae 24-propylcholesta-5,24(28)-dien-3β-ol Crysophyceae

  3. Paleo proxy calibration Sourceorganism + = Paleo Proxy Preserved

  4. Is PP reflected in underlyingsediments? • Lipiddistributionsreflectproductivityvariations (Lee and Wakeham, 1988; Hernández-Sánchez et al., 2010). Coccolithophorids Alkenones Sterols Diatoms

  5. Paleo proxycalibration • Is PP reflected in underlyingsediments?: Potentialforcommunityassemblageproxy Sourceorganism + = Paleo Proxy Preserved

  6. Biomarkerdistributions in Surfacewaters

  7. Biomarkerdistributions in deepwaters

  8. Biomarkerdistributions in Surfacesediments

  9. Why so different? Seasonalbias - Hardman-Mounford et al. (2003) chl-a data: weakseasonality at St. 6 and St. 11 Degradation

  10. Vertical Fluxes 230Thxs

  11. Summary • Biomarker distributions in upper water column suggests homogeneous productivity • Distributions strikingly different in sediments • Most degradation occurs throughout the water column and/orsediment-water interface • Alkenones, hydroxy methyl alkanoates and diols seem to be the most diagenetically stable. • Subtle differences in [O2] seem to have an effect on preservation

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

  13. Paleo proxycalibration • Is PP reflected in underlyingsediments?: - Hernandez-Sanchez et al. (Pancost, Henderson, Homoky, Bounman, Thomas +). GCA? • GDGT distributions in the water column: Implications for the TEX86paleothermometry 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)

  14. 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.)

  15. Thanks for your attention!

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