1 / 16

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.

kert
Télécharger la présentation

Organics at 40 o S (D357)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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!

More Related