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				4
Date depart			9/23/98
Date arrive			10/3/98
Port depart			Victoria
Port arrive			Seattle
Chief scientist			Hugh Milburn
pCO2 operator			Marilyn Roberts
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. Sept. 23: 	Departure from Victoria. 		
2. Sept. 24: 	The printer hang up during the night.		
		Problems with pipette filling.		
3. Sept. 25:	The coulometer froze in the morning.		
		The agreement of the gas loops was poor.		
4. Sept. 27:	The printer hang up twice.		
		Some bad runs with very low counts.		
5. Sept. 29:	The coulometer had flozen in the evening.		
		The system was unstable.		
		The counts were low. The tubing in pinch valve #8 was massaged.							
6. Oct. 1:	The coulometer froze in the morning.							
7. Oct. 2:	The coulometer froze in the morning.							
		The salinity readings were bad. The tubings was crimped at the pinch valve #9.							
		The end of sampling. 							
8. Oct. 3: 	Arrival to Seattle.							

Data Reduction and Quality Control:								
1. Salinity correction was applied for the samples.								
2. CRM correction:								
    Batch #42 was used during the entire cruise								
    Average: 			1984.05					
    Stdev: 			0.86					
    Number of standards:	4					
    Certified Value:		1985.10					
    Correction:			1.05					
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