RB-09-04 PNE Readme File
  
Ship:                   NOAA research vessel Ronald H. Brown 
Cruise Start:           Bridgetown, Barbados, July 11, 2009 
Cruise End:             San Juan, Puerto Rico, Aug. 4, 2009 
Chief Scientists:       Rick Lumpkin 
System Operator:        Jonathan Shannahoff  

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 4 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. Four 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. An offset of 3.50 minutes was applied to SST data from the 
ship's computer system. 

4. There were 2 prolonged data interruptions.  The first occurred on 
July 18 at 05:07 and lasted until July 19 at 20:30.  The second 
started on July 29 at 03:03 and ended on August 1 at 16:52.  

For questions or comments contact: 
Bob Castle 
4301 Rickenbacker Causeway 
Miami, FL 33149 
305-361-4418 
robert.castle@noaa.gov 

Pierrot, D., C. Neil, K. Sullivan, R. Castle, R. Wanninkhof, H. Lueger, 
T. Johannson, A. Olsen, R. A. Feely, and C. E. Cosca (2009),
Recommendations for autonomous underway pCO2 measuring systems 
and data reduction routines, Deep-Sea Res II, 56, 512-522.