Jasmine 1999 Leg 2B Readme File

Ship:			NOAA research vessel Ronald H. Brown
Cruise Start:		Singapore, April 30, 1999
Cruise End:		Darwin, Australia, June 8 1999
Chief Scientist:	Christopher Fairall
System Operator:	Dana Greeley

Method:
Infrared absorption of dried gas.  For details of the system see: 
Measurement of fugacity of Carbon Dioxide in surface water and air using 
continuous sampling methods.  Wanninkhof and Thoning, 1993 in Marine Chemistry
44, 189-205, 
And:
Feely, R.A., R. Wanninkhof, H.B. Milburn, C.E. Cosca, M. Stapp, and P.P. Murphy, 
A new automated underway system for making high precision pCO2 measurements 
onboard research ships, Analytica Chim. Acta, 377, 185-191, 1998.

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

Sampling Cycle:
The system runs on an hourly cycle during which 3 standard gases, 3 air 
samples from the bow tower and 8 surface water samples (from the 
equilibrator head space) are analyzed on the following schedule:

Mins. after hour		Sample
4				Low Standard
8				Mid Standard
12				High Standard
16.5				Water
21				Water
25.5				Water
30				Water
34				Air
38				Air
42				Air
46.5				Water
51				Water
55.5				Water
60				Water

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 for Leg 2B:
1. The cruise began on April 30, 1999 but we were not allowed to 
sample in Indonesian waters.  The data begins on May 4, 1999 at 
0000 GMT and ends on May 31, 1999 at 2259 GMT when the ship 
entered Indonesian waters again.  After exiting Indonesian waters 
the second time, data starts again on June 5 at 1800 GMT and ends 
upon arrival at Darwin on June 7 at 0600 GMT.  I have broken the 
leg into parts 2A and 2B for this reason.
2. No data was collected on leg 1 of the Jasmine cruise.
3. When the system was restarted on June 5, data from the ship's 
computer system (SCS) was no longer recorded in the data file.  I 
have been unable to obtain this data so I derived SCS temperature 
and salinity from equilibrator temperature and YSI TSG salinity 
respectively.  I used data from leg 2A of this cruise for that 
purpose, determining linear equations in both cases that are 
given in the notes below.
4. For temperature the equation used was:  SCS T = (1.009546 * EqT) 
- 0.463015 with R^2 = 0.991904.
5. For salinity I used only the data from leg 2A that occurred after 
the calibration of the YSI TSG on May 24.  The equation used was 
SCS Sal = (1.009276 * YSI Sal) - 1.061172 with R^2 = 0.994521.
6. On June 6 from 0150 to 0340, approximately 1-1/2 hours of data 
were not recorded while the system operator installed a patch in 
the program.

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