GU0802-Leg 2 Readme Class of Data: Surface ocean carbon dioxide concentrations Dataset Identifer: GU0802 Leg2 Expocode: 33GG20080512 Statement of how to cite dataset: Gordon Gunter website: http://www.aoml.noaa.gov/ocd/gcc/rvgunter_introduction.php For more information on dataset citation and for a full description of the instrumentation and procedures, see the Master Readme file accessible thru the Master Readme link located in the left navigation bar of the R/V Gordon Gunter web pages. Measurement platform identifier: R/V Gordon Gunter Data quality issues: The data reduction for this dataset was done using pCO2 Sys v1.02. Standard Gases and Reference Gas: The three standard gases come from Scott-Marrin, Inc., and are calibrated with primary standards that are directly traceable to the WMO scale. The zero gas is a non-calibrated ultra-high purity gas from a commercial company. Any value outside the range of the standards should be considered approximate (5 ppm). While individual data points above 450 or below 245 may be 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 ja 2280 248.73 Scott-Marrin, Inc. STD3 ja 2292 372.88 Scott-Marrin, Inc. STD4 450.59 Scott-Marrin, Inc. 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. Ship Information: NOAA Research Vessel Gordon Gunter website: http://www.moc.noaa.gov/gu/index.html Scientists responsible for technical quality of this dataset: Rik Wanninkhof (305)361-4379 Rik.Wanninkhof@noaa.gov Denis Pierrot (305)361-4441 Denis.Pierrot@noaa.gov Timestamp for dataset reduction: 09/20/08 Timestamp for most recent update of dataset: 11/25/08 Time period the dataset refers to: 5/12/2008 - 5/30/2008 Geographic area the dataset refers to: Gulf of Mexico