Equatorial Pacific Isotope and Mg/Ca Data and SST Reconstruction: Readme file
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              World Data Center for Paleoclimatology, Boulder
                                and 
                   NOAA Paleoclimatology Program
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NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!!

NAME OF DATA SET: Equatorial Pacific Isotope and Mg/Ca Data and SST Reconstruction

LAST UPDATE: 3/2001 (Original Receipt by WDCA Paleo)  
CONTRIBUTOR: David Lea, University of California-Santa Barbara

IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2001-023

SUGGESTED DATA CITATION: Lea, D. W. et al., 2001, 
Equatorial Pacific Isotope and Mg/Ca Data and SST Reconstruction, 
IGBP PAGES/World Data Center A for Paleoclimatology 
Data Contribution Series #2001-023.
NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. 

ORIGINAL REFERENCE: Lea D. W., Pak D. K., and Spero H. J., 2000. 
Climate impact of late Quaternary equatorial Pacific 
sea surface temperature variations. 
Science 289(5485), 1719-1724, 8 September 2000.

FUNDING SOURCE:  National Science Foundation (USA).

GEOGRAPHIC REGION: Equatorial Pacific
PERIOD OF RECORD: 470KYrBP-present

LIST OF FILES: Readme_Lea2000.txt (this file),
TR163-19.txt, ODP806B.txt (tab-delimited ASCII format).


DESCRIPTION: 
Magnesium/calcium data from planktonic foraminifera in equatorial 
Pacific sediment cores as a paleotemperature proxy.
Indicated tropical Pacific sea surface temperatures (SSTs) were 2.8° ± 0.7°C
colder than the present at the last glacial maximum, and glacial-interglacial 
temperature differences as great as 5°C are observed over the last 450 
thousand years. 

File tr163-19.txt
Core TR163-19, Cocos Ridge
lat: 2°15.5'N
long: 90°57.1'W
2348m water depth

Variables and units: Depth (cm), Age (ky), G. ruber O18 (PDB), 
Mg/Ca (mmol/mol), SST (°C), O18w (SMOW)

Data precision: O18, ±0.06; Mg/Ca, ±2.1%; SST (est.), ±0.6°C; O18w (est.), ±0.18

core site is NW flank of Cocos Ridge, collected in February 1975.
Core is 10.3m long, archived at University of Rhode Island

Mg/Ca data on cleaned G. ruber shells by ICP-MS, SST estimates based on 
calibration in Lea et al., 2000, O18w calculated from O18ruber measurements, 
Mg/Ca-temperature estimates and Orbulina low light paleotemperature equations 
(Bemis et al., 1998).

chrono-strat info: conversion of core depth to age is based on radiocarbon age 
of core-top and correlation of the ruber O18 record to the planktonic SPECMAP 
normalized O18 curve (Imbrie et al., 1984).



File odp806b.txt
ODP Hole 806B, Ontong Java Plateau
lat: 0°19.1'N
long: 159°21.7'E
2520m water depth

Variables and units: Depth (cm), Age (ky), G. ruber O18 (PDB), Mg/Ca (mmol/mol), 
SST (°C), O18w (SMOW)

Data precision: O18, ±0.06; Mg/Ca, ±2.1%; SST (est.), ±0.6°C; O18w (est.), ±0.18

Mg/Ca data on cleaned G. ruber shells by ICP-MS, SST estimates based on 
calibration in Lea et al., 2000, O18w calculated from O18ruber measurements, 
Mg/Ca-temperature estimates and Orbulina low light paleotemperature equations 
(Bemis et al., 1998).

chrono-strat info: conversion of core depth to age is based on estimated age of 
core-top and correlation of the ruber O18 record to the planktonic SPECMAP 
normalized O18 curve (Imbrie et al., 1984).