HB1104 ReadMe

Class of Data:  Surface ocean carbon dioxide concentrations

Dataset Identifier:  HB1104 Habitat Mapping

Expocode: 33HH20110805

Statement of how to cite dataset:

     Bigelow website: http://www.aoml.noaa.gov/ocd/gcc/rvbigelow_introduction.php
     For more information on dataset citation please see Master Readme File.

Measurement platform identifier:  NOAA Ship Henry B. Bigelow, R225

Time period the dataset refers to:  5 August, 2011 - 10 August, 2011

Geographic area the dataset refers to:

      Latitude,  39.3 to 41.4 degree north
      Longitude,  71.4 to 72.5 degree west

Standard and Reference Gases:  
     The four CO2 standard cylinders come from Scott-Marrin, Inc., and are 
     calibrated with primary standards that are directly traceable to the 
     WMO scale.  The zero gas is ultra-high purity air.  Any value outside
     the range of the standards should be considered approximate (+/-5 ppm).
     While individual data points above 520 or below 200 may less accurate,
     the general trends would be indicative of the seawater chemistry.  
     The standards used on the cruise are:

      STANDARD        TANK #        [CO2]ppm       VENDOR
         STD1         JA02645        204.74      Scott-Marrin
         STD2         JA02273        317.49      Scott-Marrin
         STD3         JA02285        372.23      Scott-Marrin
         STD4         JA02647        518.24      Scott-Marrin
         STD5         JA03093          0.00      Scott-Marrin

Data quality issues:

     The sea water flow during this cruise was consistently greater than 2 L/min,
     which provided optimal response time and spatial resolution.  The gas flow
     of the equilibrator headspace was more variable than preferred, but it stayed 
     above the minimum flow for all but a few analyses.

     The file containing the 15-second averages of the ship's underway sensors was
     used to fill gaps in the data appended to the CO2 data in real-time (i.e. 206 
     barometric pressures, 188 sea surface temperatures, 184 salinities).

Timestamp for dataset reduction:  28 October, 2011

Timestamp for most recent update of dataset:  28 October, 2011

Matlab version used for reduction: 1.10

Contact person for this dataset:  

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