RB-08-06A
Stratus/Vocals1 Readme File

Ship:			NOAA research vessel Ronald H. Brown
Cruise Start:	      	Rodman, Panama, Oct. 14, 2008
Cruise End:		Arica, Chile, Nov. 3, 2008
Chief Scientists:	Bob Weller
System Operator:	Jonathan Shannahoff
Expocode:               33RO20081014 

Method:
The system was built by General Oceanics (GO) and is described in 
Pierrot, et al. (2009)

The three standard gases come from CMDL in Boulder and are directly
traceable to the WMO scale.

Sampling Cycle:
The system runs on an cycle during which 3 standard gases, 5 air 
samples from the bow tower and 50 surface water samples (from the 
equilibrator head space) are analyzed on the following schedule:


1. Zero and span of Licor
2. Three standard gases
3. Five air samples
4. Fifty equilibrator headspace gas samples
5. Repeat steps 2 - 4 nine more times
6. Restart from step 1

Standards:  CA6709: 284.75 ppm, CA2813: 363.24 ppm, CA9721: 432.57
ppm, CA7931: 545.88 ppm.

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:
1.	Any values outside the range of the standards (284.75 to 
545.88 ppm) have been flagged as 3 and should be considered 
approximate (within 5 ppm).  While individual data points above 545
or below 285 may not be accurate, the general trends should be 
indicative of the seawater chemistry.
2.	Salinity readings from the ship's TSG were bad.  Readings 
from the Seabird Micro TSG connected to the analytical system were
used instead.
3.	There were propulsion (Z-drive) problems that required interruption of this cruise.  
The ship left Panama on 14 Oct, sailed ~SW for ~day, and then returned to Panama for repairs.   
During this first interval, the CO2 system performed fine though the SCS data were not 
recorded - there was no direct SST measurements.   The ship left Panama a day later (18 Oct, YD 292), 
but the GPS as well as the SCS data were not being recorded.  The GPS positions were recorded starting 
at 15:00 on 20 Oct (YD 294.62) and the SCS data were recorded starting at 10:00 on 21 Oct (YD 295.42).  
The first submission of data for this cruise only included analyses that had SCS data.  The resubmission 
includes some new raw data files plus all of the data initially submitted.  With the resubmission of data, 
the ExpoCode associated with the cruise was adjusted to cover the new data at the start of the cruise.  
For the analyses with SCS data, a 1.65min time offset between the Equ and SBE21 Temperatures was 
determined, which was the transit time between the inlet and seawater pump and the equilibrator.  
A 0.226 (+/-0.056) degree Celsius temperature offset between the equilibrator and time-shifted SST (YD 296.5 - 308) 
was calculated.  The equilibrator temperatures were warmer.   For the analyses without SCS data, the SST values 
were estimated by subtracting 0.226 degree from the equilibrator temperatures. 
 Original Data Location: http://www.aoml.noaa.gov/ocd/ocdweb/brown/brown_introduction.html 

For questions or comments contact:
Kevin Sullivan
4301 Rickenbacker Causeway
Miami, FL 33149
305-361-4382
kevin.sullivan@noaa.gov