Northeast Pacific Anthropogenic CO2 Uptake 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: Northeast Pacific Anthropogenic CO2 Uptake Data

LAST UPDATE: 5/2000 (Original Receipt by WDCA Paleo)  
CONTRIBUTORS:  J.D. Ortiz, A.C. Mix, P.A. Wheeler, and R.M. Key

IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2000-037

SUGGESTED DATA CITATION: Ortiz, J.D., et al, 2000, 
Northeast Pacific Anthropogenic CO2 Uptake Data, 
IGBP PAGES/World Data Center A for Paleoclimatology 
Data Contribution Series #2000-037.
NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. 

ORIGINAL REFERENCE: J.D. Ortiz, A.C. Mix, P.A. Wheeler, 
and R.M. Key, 2000,  Anthropogenic CO2 invasion into the 
northeast Pacific based on concurrent d13C_DIC and nutrient 
profiles from the California Current, 
Global Biogeochemical Cycles, Vol. 14 , No. 3 , p. 917.

GEOGRAPHIC REGION: northeast Pacific
PERIOD OF RECORD: ~1800 AD - present

LIST OF FILES: Readme.Ortiz2000.txt (this file),
Ortiz2000.data.txt (Tab-delimited ASCII text format),
Ortiz2000.figures.pdf (Adobe Acrobat format).

DESCRIPTION: 
Northeast Pacific Anthropogenic CO2 Uptake Data.

The stable isotopic signature of dissolved inorganic carbon 
(d13C_DIC) in the northeast Pacific Ocean is lower in near-surface 
waters by »1.1‰ relative to values predicted from global oceanic 
trends of d13C_DIC versus nutrients. A combination of anthropogenic 
carbon uptake from the atmosphere and thermo-dynamic, air-sea gas 
exchange processes in different water mass source areas account for 
the isotopic depletion.  Here we evaluate the efficacy of using a 
concurrent nutrient-d13C strategy to separate these two effects,
with the goal of improving estimates of anthropogenic carbon uptake 
over the course of the Industrial Revolution.