EX0801E Readme


Class of Data:  Surface ocean carbon dioxide concentrations

Dataset Identifer:  EX0801E

Expocode: 33KF20080213

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:  EX0801E/Explorer

Data quality issues:

     Due to the slow response time of the system, removed the first 20
     minutes of data for each hour for the entire cruise.
    
     Converted the wind speed data (both true and relative) to meters per second.

     The system was down from 2/15/08 (10:47) to 2/16/08 (15:47).

     Merged missing latitude and longitude data into the data file from VIDS\GPS1.

     Removed the following questionable data - JD 50.057 to JD 50.292 and
     JD 52.655 to JD 52.696.

     Due to low gas flow removed the following data - JD 61.142 to JD 61.147,
     JD 61.154 to JD 61.156, JD 61.191 to JD 61.192 and JD 61.196 to JD 61.198.

     The equil pressure was bad from JD 44.793 to JD 51.959.  From JD 44.793 to
     JD 46.417, interpolated equil pressure using sealevel pressure.  From
     JD 47.668 to JD 51.959 there was no sealevel pressure to interpolate the
     equil pressure so this data was not included in the final file. 

     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 (300 ppm, 360 ppm, and 420 ppm) 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:  6/06/08

Timestamp for most recent update of dataset:  6/06/08

Time period the dataset refers to:  2/13/2008 - 3/03/2008

Geographic area the dataset refers to:

     Day 1  - Enroute to the Caribbean
     Day 6  - Labadee, Haiti (19.8 N/72.3 W)
     Day 7  - Casa de Campo, Dominican Republic (18.4 N/69.0 W)
     Day 8  - Charlotte Amalie, St. Thomas (18.3 N/64.9 W)
     Day 9  - San Juan, Puerto Rico (18.5 N/66.1 W)
     Day 12 - Bayonne, New Jersey (40.7 N/74.1 W)
     Day 15 - Philisburg, St. Maarten (18.0 N/63.0 W)
     Day 16 - St. John, Antigua (17.1 N/61.8 W)
     Day 17 - Rouseau, Dominia (15.3 N/61.4 W)
     Day 18 - Bridgetown, Barbados (13.1 N/59.6 W)
     Day 19 - Basseterre, St. Kitts (17.3 N/62. 7 W)