2 March 2000 readme.txt This is the documentation to accompany the surface pCO2 data files submitted to CDIAC in July, 2000. Event Numbers are not included because there is not corresponding Event Number which is appropriate. These files are from a continuous underway sampling system, which was generally operated throughout the cruise. There are 10 files as follows: File Name Cruise Name Data Count (pco2 values) 9406sfc.dat Ross Sea 123* 9604sfc.dat JGOFS Southern Ocean Site Survey 5,529 9605sfc.dat JGOFS Southern Ocean Mooring Deployment 3,215 9606sfc.dat ROAVERRS 7,459 9701sfc.dat JGOFS Southern Ocean Process II 8,399 9703sfc.dat JGOFS Southern Ocean Process III 5,014 9708sfc.dat JGOFS Southern Ocean Process IV 15,411 9802sfc.dat JGOFS Southern Ocean Benthic Proc. 22,474 kiw8sfc.dat JGOFS Southern Ocean Survey II (KIWI-8) 9,161 kiw9sfc.dat JGOFS Southern Ocean Process II (KIWI-9) 10,584 ------- Total 87,369 * This file has been processed by averaging the data to 6 hour intervals. Data from JGOFS Southern Ocean Process I is not available. The shipboard pCO2 system was not properly started and no data were recorded. Below is a sample from one of the files. The heading definitions are as follows: LAT: Latitude in decimal degrees, South is negative. LON: Longitude in decimal degrees, West is negative, East is positive. YEAR: 4 digit year. JDATE: Julian Date (including time of the day), 0000 1 Jan = 1.00000, 2359 31 Dec = 365.99931 Time Zone is UTC (GMT) TEMP: Sea Surface Temperature in degrees Celsius. SAL: Sea Surface Salinity on the Practical Salinity Scale. PBARO: Pressure of equilibration in millibars/ TEMP_PCO2: Temperature at which the pCO2 was measured. VCO2_SW: mole volume of CO2 in dry air, units of parts per million. PCO2_MEAS: Measured partial pressure of CO2 in seawater, units are microatmospheres. PCO2_THETA: Partial pressure of CO2 in seawater corrected to the Sea Surface Temperature (TEMP) using 4.23% per degree Celsius. LAT LON YEAR JDATE TEMP SAL PBARO TEMP_PCO2 VCO2_SW PCO2_MEAS PCO2_THETA -76.494 170.909 1998 56.00820 -1.600 33.990 987.9 -0.55 272.86 264.90 253.39 -76.493 170.918 1998 56.00950 -1.600 33.990 987.9 -0.55 272.33 264.40 252.91 -76.488 170.935 1998 56.01080 -1.580 34.000 988.0 -0.50 272.64 264.80 252.98 -76.484 170.955 1998 56.01210 -1.570 33.990 987.9 -0.50 272.94 264.90 253.18 -76.484 170.982 1998 56.01340 -1.560 34.000 987.8 -0.52 273.48 265.50 254.07 -76.485 171.009 1998 56.01470 -1.560 34.030 987.8 -0.51 274.73 266.70 255.11 -76.485 171.036 1998 56.01600 -1.560 34.030 987.8 -0.49 276.23 268.20 256.33 -76.486 171.048 1998 56.01730 -1.560 34.040 987.7 -0.50 277.38 269.30 257.49 -76.488 171.074 1998 56.01860 -1.580 34.060 987.8 -0.50 277.99 269.90 257.85