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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

Organics at 40o S (D357)

Maite Hernández/Rich Pancost

slide2

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

slide3

Paleo proxy calibration

Sourceorganism

+

=

Paleo Proxy

Preserved

is pp reflected in underlying sediments
Is PP reflected in underlyingsediments?
  • Lipiddistributionsreflectproductivityvariations (Lee and Wakeham, 1988; Hernández-Sánchez et al., 2010).

Coccolithophorids

Alkenones

Sterols

Diatoms

paleo proxy calibration
Paleo proxycalibration
  • Is PP reflected in underlyingsediments?: Potentialforcommunityassemblageproxy

Sourceorganism

+

=

Paleo Proxy

Preserved

slide10

Why so different?

Seasonalbias

- Hardman-Mounford et al. (2003) chl-a data: weakseasonality at St. 6 and St. 11

Degradation

slide12

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
to do
To do …
  • Biomarker distributions represent community structure in surface waters.
    • Heather Bounman and Tom
  • Estimate vertical fluxes.
    • Gideon Henderson and Alex Thomas
paleo proxy calibration1
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)

other outcomes
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.)