Late Quaternary North Atlantic IRD and Isotope Data: Readme file

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                   NOAA Paleoclimatology Program
                               and
              World Data Center A - for Paleoclimatology
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NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!!

NAME OF DATA SET: Late Quaternary North Atlantic IRD and Isotope Data

LAST UPDATE: 12/2004 (Correction of depth column header from cm. to m. 
in file tr163-31p_cib_iso.txt)  

CONTRIBUTOR: Mark R. Chapman, University of Cambridge

IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 1999-053

SUGGESTED DATA CITATION: Chapman, M.R. and Shackleton, N.J., 1999, 
Late Quaternary North Atlantic IRD and Isotope Data, 
IGBP PAGES/World Data Center A for Paleoclimatology 
Data Contribution Series #1999-053. 
NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. 

ORIGINAL REFERENCE: Chapman, M.R. and Shackleton, N.J., 1999, 
Global ice-volume fluctuations, North Atlantic ice-rafting events,
and deep-ocean circulation changes between 130 and 70 ka, 
Geology, vol 27, pages 795-798.

FUNDING SOURCE: Natural Environment Research Council, United Kingdom

GEOGRAPHIC REGION: North Atlantic
PERIOD OF RECORD:  130 to 55 KYrBP

LIST OF FILES: Readme.Chapman1999.txt (this file), 
NEAP18K.IRD.txt, NEAP18K.Cib.iso.txt, NEAP18K.Gbull.18O.txt, 
NEAP18K.Lightness.txt, NEAP18K.iso.age.txt, TR163-31P.Cib.iso.txt
(tab delimited text format with 1st row
headings specifying variable names and units):

DESCRIPTION:
Please note that the planktonic and benthic stable isotope data from core
NEAP18K are stored as individual separate files in the depth domain and as
a single composite file in the age domain. This is because (i) the sampling
interval for each dataset is not uniform, and (ii) the stable isotope
datasets include a large number of replicate measurements that were made
for a given sample (these data are averaged in the isotopes vs age file) .

File name: NEAP18K.IRD.txt
No. columns: 3 (depth, age, %IRD)
Comments: Relative abundance counts of ice rafted detritus made using the
>150mm sediment fraction.
Core name: NEAP18K
Core details: 52°46'N, 30°21'W, 3275 m water depth

File name: TR163-31P.Cib.iso.txt
No. columns: 4 (depth, age, Cib O-18, Cib C-13)
Comments: O and C stable isotope measurements of Cibicidoides wuellerstorfi.
Depth label corrected from cm. to m. 12/2004
Core name: TR163-31P
Core details: 3°37'N, 83°58'W, 3210 m water depth


File name: NEAP18K.iso.age.txt
No. columns: 5 (depth, age, Cib O-18, Cib C-13, G.bull O-18)
Comments: Data are interpolated at 2cm intervals using a Gaussian filter
with a width of 8cm.  Cib - Cibicidoides wuellerstorfi, G.bull -
Globigerina bulloides.
Core name: NEAP18K
Core details: 52°46'N, 30°21'W, 3275 m water depth


File name: NEAP18K.Gbull.18O.txt
No. columns: 2 (depth, O-18)
Comments: O stable isotope measurements of Globigerina bulloides
Core name: NEAP18K
Core details: 52°46'N, 30°21'W, 3275 m water depth


File name: NEAP18K.Cib.iso.txt
No. columns: 3 (depth, Cib O-18, Cib C-13)
Comments: O and C stable isotope measurements of Cibicidoides wuellerstorfi.
Core name: NEAP18K
Core details: 52°46'N, 30°21'W, 3275 m water depth


File name: NEAP18K.Lightness.txt
No. columns: 3 (depth, age, L*)
Comments: Spectrophotometric analyses of sediment lightness (L*)
Core name: NEAP18K
Core details: 52°46'N, 30°21'W, 3275 m water depth