delta_13C_surface

 PI:              Paul Quay
 of:              University of Washington
 dataset:         Total CO2 and delta 13C of seawater from surface seawater line
 project/cruise:  AESOPS/All Cruises
 ship:            Nathaniel B. Palmer, Roger A. Revelle

 References:  1. Kroopnick, P.M. (1974), The dissolved O2-CO2-13C system in the 
                 eastern equatorial Pacific.  Deep-Sea Research, 21, 211-227.

              2. Quay, P.D., B. Tilbrook and C.S. Wong (1992), Oceanic uptake of
                 fossil fuel CO2: Carbon-13 evidence.  Science, 256, 74-79.

 Parameter    Description                                Units

 cruise_id    cruise designation
 date         date sample collected (YYYYMMDD)
 lat          latitude, negative=south                   decimal degrees
 lon          longitude, negative=west                   decimal degrees
 tco2         manometric total CO2 in seawater           micromoles C per kilogram
 delta13C     C13/C12 ratio of tco2                      per mil
 nd           no/bad data