General Cruise Information, 		
Underway SOMMA:  Operations, Data Reduction and Quality Control		

General Cruise Information:			
Ship				Ronald H. Brown
Year				1999
Cruise name			RB-99-06 (NOPP)
Leg				3
Date depart			10/4/99
Date arrive			10/23/99
Port depart			Dutch Harbor
Port arrive			Seattle
Chief scientist			Marilyn Roberts
pCO2 operator			Marilyn Roberts
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. Oct 5: Departure from Dutch Harbor			
2. Oct 6: Problems with carrier gas. By the end of the cell the pipette did not get filled properly.			
3. Oct 9: The system is noisy. A new cell was prepared.			
4. Oct 10: The program hang up during CRM titration. The CRM was rerun.			
5. Oct 11: Bad gas calibration.			
6. Oct 16: The actuator was changed. The old one double/triple pumped occasionally.			
7. Oct 17: A new gas standard was set on line. The calibration factor was now higher.			
8. Oct 18: The calibration factor was at the normal level again (1.00422).			
9. Oct 23: The system was shut down at 17:30, arrival to Seattle.		


Data Reduction and Quality Control:		
1. The LabView SOMMA program was used the first time.		
2. LAT, LONG and TSG S were merged.	
3. Salinity correction was applied for the samples.		
    SOMMA program calculates the CRM values using certified CRM salinity values and therefore 		
    a salinity correction was not done for the CRMs. A measured salinity value is also in the file		
    to show how well the salinity sensor is working.		
4. CRM correction:		

			Batch 45	Batch 43
Average:		2003.661534	1996.190485
Stdev:			2.160353085	1.73688355
Certified Value:	1994.17		1988.64
Offset:	-9.491534433	-7.550484535
CRM correction:	(-9.49-7.55)/2= -8.52

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