EX1134 Readme


Class of Data:  Surface ocean carbon dioxide concentrations

Dataset Identifier:  EX1134

Expocode: 33KF20110924

Statement of how to cite dataset:

     For information on dataset citation and more, please see Master Readme File.
     Explorer website: http://www.aoml.noaa.gov/ocd/gcc/explorer_introduction.php

Measurement platform identifier:  EX1134/Explorer

Data quality issues:

     Standard Gases and Reference Gas:  The three standard gases come from CMDL
     in Boulder and are directly traceable to the WMO scale.  The zero gas
     is a non-calibrated gas from a commercial company.  Any value outside the
     range of the standards should be considered approximate (5 ppm).
     While individual data points above 550 or below 300 may less accurate,
     the general trends should be indicative of the seawater chemistry.  
     The standards used on the cruise are:

      STANDARD        TANK #       CONCENTRATION       VENDOR
        STD1                            0.00         Commercial
        STD2         CA05988          593.64           CMDL
        STD3         CA02040          319.82           CMDL  
        STD4         CA02030          377.14           CMDL        

     Units:  All xCO2 values are reported in parts per million (ppm) and fCO2
     values are reported in microatmospheres (uatm) assuming 100% humidity at the
     equilibrator temperature.

     The gas flow meter had failed but was using dummy coefficients during the last 
     cruise.  These dummy coefficients allowed the software, which has an active
     feedback loop, to continue running without adjusting the equilibrator gas pump
     speed and flow beyond the optimal range.  The data did not include any 
     gas flow rates.

     The pattern and measured values of CO2 and water in the equilibrator gas 
     indicated that the gas flow was close to zero after 11:30 on 28 Sept till the 
     end of the cruise.  No equilibrator analyses were kept during this period.

Contact person for this dataset:  

     Kevin Sullivan
     (305)361-4382
     Kevin.Sullivan@noaa.gov

Timestamp for dataset reduction:  11/28/11

Timestamp for most recent update of dataset:  11/28/11

Matlab version used for reduction: 1.10

Time period the dataset refers to:  9/24/2011 - 9/29/2011

Geographic area the dataset refers to:

   Day 1  - Bayonne, New Jersey (40.7 N / 74.1 W)
   Day 3  - Kings Wharf, Bermuda (32.3 N / 64.8 W)
   Day 4  - Kings Wharf, Bermuda (32.3 N / 64.8 W)
   Day 6  - Bayonne, New Jersey (40.7 N / 74.1 W)