EX0724B Readme

Class of Data:  Surface ocean carbon dioxide concentrations

Dataset Identifer:  EX0724B

Statement of how to cite dataset:

     Explorer website: http://www.aoml.noaa.gov/ocd/gcc/explorer_cruisetracks.php

     For more information on dataset citation please see Master Readme File.

Measurement platform identifier:  EX0724B/Explorer

Data quality issues:

     Converted the wind speed (both relative and true) to meters per second.

     Removed the following questionable data - JD 164.975 to JD 165.000.

     On Tuesday, June 5, the entire seawater system (including the pCO2
     system) was flushed with fresh water.  Don then hooked up the fresh
     water line directly to the pCO2 system and flushed the pco2 system
     for 10 minutes.  After the flush, the flow rate was 1.75 lpm.

     On Saturday, June 9, the pCO2 system was flushed again with fresh water
     for 15 to 20 minutes.  After the system was flushed, the flow rate was
     1.8 lpm.

     On Sunday, June 10, Don cleaned both the housing and the metal filter in
     the pCO2 system.

     On Wednesday, June 13, the pCO2 system was down from 9:11 to 17:02 for
     a ship-wide blackout test.

     On Sunday, June 17, Kevin Sullivan checked and cleaned the system.
  
     Standard Gases and Reference Gas:  The three standard gases come from CMDL
     in Boulder and are directly traceable to the WMO scale.  The reference 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 420 or below 300 may not be accurate, the
     general trends should be indicative of the seawater chemistry.  The
     standards used on the cruise are:

           STANDARD          TANK #       CONCENTRATION       VENDOR
           STD1              CA02040          319.82           CMDL
           STD2              CA02030          377.14           CMDL                                               
           STD3              CA02020          458.04           CMDL
           Reference Gas                                     Commercial                                               
                                             
     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 first hour of data after leaving port is removed.

Project Information:

     RSMAS Explorer website:  http://www.rsmas.miami.edu/rccl/obs/ex-rt-obs.pl

Contact person for this dataset:  

     Betty Huss
     (305)361-4395
     Betty.Huss@noaa.gov

Timestamp for dataset reduction:  8/06/07

Timestamp for most recent update of dataset:  8/06/06

Time period the dataset refers to:  6/08/2007 - 6/17/2007

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 5 - Philipsburg, St. Maarten (18.0 N/63.0 W)
     Day 6 - Charlotte Amalie, St. Thomas (18.3 N/64.9 W)
     Day 7 - San Juan, Puerto Rico (18.5 N/66.1 W)
     Day 10 - Bayonne, New Jersey (40.7 N/74.1 W)