EX1021 Readme


Class of Data:  Surface ocean carbon dioxide concentrations

Dataset Identifier:  EX1021

Expocode: 33KF20100703

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:  EX1021/Explorer

Data quality issues:

     The LICOR analyzer operated well for the first 19 hours; but over the next 
     10 hours, the response decreased by approximately 25%.  The response returned
     to its original level abruptly and remained at that level with slightly greater
     variability.

     The condenser temperature during the outbound transit was above 25C but was close
     to the normal 5C during the return transit.  The concentration of water vapor in the
     sample gas streams during the outbound transit was only slightly greater than normal
     because of the efficiency of the Nafion dryers.

     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             CA07952          549.89           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.


Contact person for this dataset:  

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

Timestamp for dataset reduction:  5/17/11

Timestamp for most recent update of dataset:  5/17/11

Matlab version used for reduction: 1.09

Time period the dataset refers to:  7/3/2010 - 7/8/2010

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)