Jasmine 1999 Leg 2B Readme File Ship: NOAA research vessel Ronald H. Brown Cruise Start: Singapore, April 30, 1999 Cruise End: Darwin, Australia, June 8 1999 Chief Scientist: Christopher Fairall System Operator: Dana Greeley Method: Infrared absorption of dried gas. For details of the system see: Measurement of fugacity of Carbon Dioxide in surface water and air using continuous sampling methods. Wanninkhof and Thoning, 1993 in Marine Chemistry 44, 189-205, And: Feely, R.A., R. Wanninkhof, H.B. Milburn, C.E. Cosca, M. Stapp, and P.P. Murphy, A new automated underway system for making high precision pCO2 measurements onboard research ships, Analytica Chim. Acta, 377, 185-191, 1998. The three standard gases come from CMDL in Boulder and are directly traceable to the WMO scale. Sampling Cycle: The system runs on an hourly cycle during which 3 standard gases, 3 air samples from the bow tower and 8 surface water samples (from the equilibrator head space) are analyzed on the following schedule: Mins. after hour Sample 4 Low Standard 8 Mid Standard 12 High Standard 16.5 Water 21 Water 25.5 Water 30 Water 34 Air 38 Air 42 Air 46.5 Water 51 Water 55.5 Water 60 Water 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. Notes for Leg 2B: 1. The cruise began on April 30, 1999 but we were not allowed to sample in Indonesian waters. The data begins on May 4, 1999 at 0000 GMT and ends on May 31, 1999 at 2259 GMT when the ship entered Indonesian waters again. After exiting Indonesian waters the second time, data starts again on June 5 at 1800 GMT and ends upon arrival at Darwin on June 7 at 0600 GMT. I have broken the leg into parts 2A and 2B for this reason. 2. No data was collected on leg 1 of the Jasmine cruise. 3. When the system was restarted on June 5, data from the ship's computer system (SCS) was no longer recorded in the data file. I have been unable to obtain this data so I derived SCS temperature and salinity from equilibrator temperature and YSI TSG salinity respectively. I used data from leg 2A of this cruise for that purpose, determining linear equations in both cases that are given in the notes below. 4. For temperature the equation used was: SCS T = (1.009546 * EqT) - 0.463015 with R^2 = 0.991904. 5. For salinity I used only the data from leg 2A that occurred after the calibration of the YSI TSG on May 24. The equation used was SCS Sal = (1.009276 * YSI Sal) - 1.061172 with R^2 = 0.994521. 6. On June 6 from 0150 to 0340, approximately 1-1/2 hours of data were not recorded while the system operator installed a patch in the program. For questions or comments contact: Bob Castle 4301 Rickenbacker Causeway Miami, FL 33149 305-361-4418 castle@aoml.noaa.gov