prism3d global datasets - aps physics · 2013-05-24 · ppt0000000 author: hp authorized customer...

vegetation,vegetation,land coverland cover

land iceland ice

sea sea iceice

deep ocean deep ocean temperature,temperature,circulationcirculation

topographytopography

sea levelsea level

sea surfacesea surfacetemperaturetemperature

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PRISM3D Global Datasets

Northumbria/GMU Modified from Transactions of the Leicester Literary and Philosophical Society

[n = 115]

Northumbria/GMU

PRISM is based on analysis of deep sea cores and outcrops of well dated Pliocene age material

S

Surface Ocean Temperature Reconstruction:

The perfect proxy…

Bennett Lecture

Quantitative faunal techniquesMg/Ca paleothermometry

AlkenonesSchlerochronology (Molluscs)

Bryozoan MARTSemi-quantitative methods

Northumbria/GMU

Transfer function example

SUBTROPICAL SCORESSUBTROPICAL SCORES SUBTROPICAL SUBTROPICAL LOADINGSLOADINGS

Factor 2Factor 2

Factor 2Factor 2

Dowsett, H.J., 1991. The Development of a LongDowsett, H.J., 1991. The Development of a Long--Range Foraminifer Transfer Function Range Foraminifer Transfer Function and Application to Late Pleistocene North Atlantic Climatic Extrand Application to Late Pleistocene North Atlantic Climatic Extremes. emes. PaleoceanographyPaleoceanography, 6(2): 259, 6(2): 259-Bennett Lecture

Quantitatively analyze the seafloor distribution of taxa to identify assemblages, which in turn can be related to SST and other environmental variables.

Faunal transfer functions

Northumbria/GMU

regressioncoefficients

Bennett Lecture

North Atlantic Fauna

Dowsett, H.J. and Poore, R.Z., 1990. A new planktic foraminifer Dowsett, H.J. and Poore, R.Z., 1990. A new planktic foraminifer transfer function for estimating transfer function for estimating PliocenePliocene----Holocene paleoceanographic conditions in the North AtlanticHolocene paleoceanographic conditions in the North Atlantic. Marine Micropaleontology. Marine Micropaleontology, 16(1, 16(1--2): 12): 1--23.23.

Bennett Lecture

Downcore SST estimates

Mg/Ca paleothermometryM

g/C

a m

mol

/mol

Temperature (°C)Northumbria/GMU

Alkenones

UK’37 unsaturation

index

Northumbria/GMU

Emiliana huxleyi

Semi quantitative methods

Northumbria/GMU

Schlerochronology & Stable Isotopes

University of Chicago

Bryozoan MART Analysis

Good relationship between zooid size in cheilostome bryozoa and mean annual range in temperature (MART). This provides a proxy for seasonality, and when coupled with oxygen isotope analyses of frontal walls, absolute temperature.

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deep sea cores

outcrops

shelf

open ocean

deep ocean

planktic forams

benthic forams

ostracods

diatoms

nannofossils

radiolaria

dinoflagellates

picoplankton

iiJJ

mollusks

bryozoa

data archives environments

proxies/signal carriers

Deep time marine data fusion

Northumbria/GMU (Phil. Trans. Royal Society – Dowsett et al., in press)