General Cruise Information, Underway SOMMA: Operations, Data Reduction and Quality Control General Cruise Information: Ship Ronald H. Brown Year 1999 Cruise name RB-99-03 (JASMINE) Leg 2 Date depart 4/26/99 Date arrive 5/31/99 Port depart Singapore Port arrive Darwin Chief scientist Chris W. Fairall pCO2 operator Dana Greeley pCO2 (responsible person) Robert Castle TCO2 (responsible person) Esa Peltola Chl (responsible person) Robert Castle O2 (responsible person) George Berberian Underway SOMMA (AOML-2) Operations, Data Reduction and Quality Control: Operations: 1. April 26: Departure from Jasmine 2. April 30: Sampling started at 10:21 GMT. Problems with liquid level sensor. The Seabird and flow were raised slightly and the seawater filled now the liquid level sensor. Sampling was restarted at 11:21 GMT. 3. May 1: When a new cell was set up (9:20 GMT) the coulometer froze. The coulonmeter power was turned off and on. The system was running again. At 12:30 GMT a new cell. Poor gas calibration. The system was unstable. 4. May 2: All gas flow rates and water flow rate were readjusted. The system was now more stable. The computer stopped reading the barometer. The bartest gave an error. The barometer was disconnected. The bartest was rerun and the computer reads again the barometer. At 11:00 GMT the ship went through a large oil slick 5. May 3: The system was unstable and shut down at 00:00 GMT. The water flow was too high. There was a salt brigde in the electrodes. A new cell was prepared. It was unstable. 6. May 4: A new cell was prepared at 02:00 GMT. The underway sampling was starting at 4:16 GMT. The system froze at 9:29 GMT. The coulometer was reset at 11:18 GMT. At 22:43 GMT the system was unstable: TCT (total carbon titrated) was 29.2 mg of C. 7. May 5: The system was unstable at 10:12 GMT. A new cell was set up. The system was unstable again at 18:18 GMT. 8. May 6: The gas flows were checked again. At 23:26 GMT the system was unstable (TCT = 33.3 mg of C). 9. May 7: The system was unstable at 6:08 GMT. The gas flows were checked and they were ok. At 07:00 the wire of the cathode electrode came off when it was cleaned. A loose connection might have caused the system to be unstable. 10. May 14: Gas calibration of the loop #2 was unstable (00:39 GMT). 11. May 16: The system was unstable at 22:00 GMT. 12. May 22: The tubing through PV#8 was leaking (about 4:00 GMT). The system froze while filling pipette. 13. May 24: The water flow had changed and it was readjusted (8:40 GMT). 14. May 25: Poor gas calibration at 2:00 GMT: TCT = 38.2 mg of C. 15. May 26: The system was unstable at 11:00 GMT. Poor gas calibration. 16. May 30: The system was unstable at 6:53 GMT. A new cell was set up, but it failed at 13:00 GMT. Arriving to Indonesian EEZ. Data Reduction and Quality Control: 1. LAT, LONG and TSG S were merged. 2. Salinity correction was applied for the samples. 4. CRM correction: Batch# Ave Stdev Cert. Value Diff. 42 1988.57 1.00 1985.10 -3.47 43 1993.10 1.10 1988.64 -4.46 CRM correction for the whole data set: (-3.47-4.46)/2 = -3.97 5. Quality control: The following plots were created and used to evaluate the data: TCO2 vs. Julian Time TCO2 vs. LAT TCO2 vs. LONG Chlorophyll vs. Julian Time Chlorophyll vs. LAT Chlorophyll vs. LONG Chlorophyll vs. TCO2 Temperature vs. TCO2 Salinity vs. TCO2 fCO2 (water) vs. TCO2 fCO2 (air) vs. TCO2