South Atlantic N. pachyderma Stable Isotope and Abundance Data: 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: South Atlantic N. pachyderma Stable Isotope and Abundance Data
LAST UPDATE: 3/2001 (Original Receipt by WDC Paleo)  

CONTRIBUTOR: Karen E. Kohfeld 

IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2001-029

SUGGESTED DATA CITATION: Kohfeld, K. E., 2001,
South Atlantic N. pachyderma Stable Isotope and Abundance Data, 
IGBP PAGES/World Data Center for Paleoclimatology 
Data Contribution Series #2001-029.  
NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. 


ORIGINAL REFERENCE: Kohfeld, K. E., Anderson, R. F., and 
Lynch-Stieglitz, J., 2000. Carbon isotopic disequilibrium in 
polar planktonic foraminifera and its impact on Modern and 
Last Glacial Maximum reconstructions.  Paleoceanography 15, 53-64.

GEOGRAPHIC REGION: South Atlantic Ocean
PERIOD OF RECORD: Last Glacial Maximum, PreIndustrial Modern (coretops), 
and 1992 Plankton Tows

LIST OF FILES: Readme_Kohfeld2000.txt (this file), 
multinet_foram.xls, pachy_iso.xls, site.xls (Microsoft Excel Format),
multinet_foram.txt, pachy_iso.txt, site.txt (Tab-delimited ASCII format).

DESCRIPTION:  
South Atlantic N. pachyderma Stable Isotope and Abundance Data

Table 1 (Site.xls and Site.txt) presents site locations for all data 
used in the original reference.

Table 2 (pachy_iso.xls and pachy_iso.txt) presents the stable isotope 
composition, estimated calcification depth, calcification temperatures, 
ambient d13Ceq, and carbon Isotope disequilibrium determined for 
N. pachyderma (s.) recovered from surface and Last Glacial sediments 
in the South Atlantic Ocean.  The d18O and d13C of N. pachyderma (s.) 
measured from sediment traps and surface marine sediments were compiled 
from the literature. Only surface sediment and sediment trap samples 
from the South Atlantic basin are included in the compilation. 

The apparent calcification depth was estimated by finding the depth 
at which the d18O of N. pachyderma (s.) is approximately equal to the 
d18O predicted for calcite formed in equilibrium with seawater (d18Oeq). 
Values for d18Oeq were determined as described in Kohfeld et al. (2000) 
using February temperature and salinity data from Levitus and Boyer [1994] 
along 2.5°E, d18Oeq equation of Kim and O'Neil [1997], and a d18O-Salinity (S) 
relationship determined using Geochemical Ocean Sections Study (GEOSECS) data.

Ambient preindustrial d13Ceq and the Mackensen d13Ceq were determined for the 
estimated depth of calcification using d13C of TCO2 data from Mackensen et al. 
[1993; 1996], and d13C formed in equilibrium (d13Ceq) were determined after 
Romanek et al., [1992].

Table 3 (Multinet_foram.xls and Multinet_foram.txt) presents abundance counts 
of total planktonic foraminifera counted from Multinet plankton tows taken 
from the Drake Passage (ANT X/5, August-September, 1992).