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

General Cruise Information:			
Ship				Ronald H. Brown
Year				1998
Cruise name			RB-98-03 (VENTS)
Leg				1
Date depart			7/30/98
Date arrive			8/15/98
Port depart			Newport
Port arrive			Victoria
Chief scientist			Ed Baker
pCO2 operator			Dana Greeley
pCO2 (responsible person)	Robert Castle
TCO2 (responsible person)	Esa Peltola
Chl (responsible person)	Jason Masters
O2 (responsible person)		George Berberian


Underway SOMMA (AOML-1) Operations, Data Reduction and Quality Control:			
			
Operations:			
1. Jul 30:	Departure from Newport.		
		The system was unstable.		
2. Jul 31:	Poor gas calibration.		
3. Aug 3:	The system was unstable at 4:47.		
		At 20:53 the same cell had be used 34 hours.	
4. Aug 4:	At 08:05 that same cell had be used 43 hours, TCT was 36 mg of C.	
		A same cell should not be used more than 12 hours or the TCT should not exceed about 20 mg of C.		
		The computer froze at 13:29		
		The system was unstable at 18:53		
5. Aug 5:	The computer program froze at 5:30
		The computer had communication problems with the coulometer.
		The system was unstable at 17:00
		At 21:51 the computer did not communicate with the coulometer.
6. Aug 6:	The computer did not communicate with the coulometer.
7. Aug 7:	The system was unstable at 6:30
		The system was unstable at 17:24
8. Aug 8:	The system was unstable at 15:40
9. Aug 9:	Pipett filling error at 22:30: a salt bridge in the liquid level sensor. 
10. Aug 10:	The system was unstable at 5:20
		The system was unstable at 20:31
11. Aug 13:	The system was unstable at 13:00
		The program had stopped at 23:54
12. Aug 15:	The sampling was stopped at 6:55
		Arrival to Victoria.

Data Reduction and Quality Control:				
1. Salinity correction was applied for the samples.				
2. CRM correction:				
    Batch #42 and #43 were used during this cruise				
    				
				Batch#42	Batch#43
    Average: 			1981.20		1985.13
    Stdev: 			2.43		0.91
    Number of standards:	2		2
    Certified Value:		1985.10		1988.64
    Correction:			3.9		3.5
    Correction applied for the whole dataset:	3.7
				
3. LAT and LONG were added.				
4. 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