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A.   Cruise Report: PR03
     (Updated SEP 2011)


A.1  HIGHLIGHTS

                           CRUISE SUMMARY INFORMATION

                WOCE designation  PR03
Expedition designation(EXPOCODE)  49RY9011_3
                 Chief Scientist  Shizuo Wakaki/JMA
                    Cruise dates  1990 Dec 4 to 1990 DEC 19 
                            Ship  R/V Ryofu Maru 
                   Ports of call  Guam, USA to Tokyo, Japan 

                                             35° 0' N
           Geographic boundaries  143° 58' E           144° 2' E
                                             13° 59' N

              Number of stations  5
    Floats and drifters deployed  0
  Moorings deployed or recovered  0

                           Recent Contact Information:

                                  SHIZUO WAKAKI
                           Japan Meteorological Agency
                           1-3-4, Otemachi, Chiyoda-ku
                                 Tokyo 100, Japan









1.  CRUISE SUMMARY INFORMATION

Cruise Track

The cruise track and station locations are shown in Figure 1. Observations of 
PR2 were carried out as part of the R/V Ryofu Maru cruise RY9011 Leg 1 and Leg 
2, and those of PR3 were Leg 3.


STATIONS OCCUPIED

Observations of PR2 were carried out as part of the R/V Ryofu Maru cruise 
RY9011 Leg 1 and Leg 2, and those of PR3 were Leg 3.

NUMBER OF STATIONS

A total of 28 CTD rosette stations for PR2 and 5 stations for PR3 was occupied 
using a General Oceanics 12 bottle rosette equipped with 12 1.7-liter Niskin 
water sample bottles, and an NBIS MK III B CTD. In addition, a total of 17 CTD 
stations for PR3 was occupied. No additional sensors were used with the CTD 
system.

SAMPLING

The following water sample measurements were made: salinity, oxygen, nitrate, 
nitrite and phosphate on all stations. The depths sampled were: 10, 25, 50, 75, 
100, 125, 150, 175, 200, 250, 300, 400, 500, 600, 700, 800, 900, 1000, 1250, 
1500, 2000, 2500, 3000, 4000 in meters on every station of PR2. On PR3, water
sampling was carried out at only stations every 5 degrees in latitude. Surface 
water samples were collected by a bucket.

LIST OF PRINCIPAL INVESTIGATORS

The principal investigators responsible for the individual parameters measured 
on the cruise are listed in Table 1. (All the correspondence on these data 
should be addressed to the Director of the Oceanographical Division, Marine 
Department, Japan Meteorological Agency.)


Table 1:  Principal Investigators for all measurements.

               Name        Responsibility  Affiliation
               ----------  --------------  --------------
               H. Minami   CTD, S          JMA/MD
               K. Fushimi  O2, Nutrients   JMA/MD

               JMA/MD  Marine Department, Japan Meteorological Agency




2.  MEASUREMENT TECHNIQUES AND CALIBRATIONS


2.1  CTD

The CTD is NBIS Mark III B. An HP9000 Series 300 model 330 (Hewlette Packard) 
with 4 MByte of memory was used as the primary data collection device and all 
FSK signals of CTD data were backed up using the digital audio tape (DAT). The 
original sampling rate is 31.25 samples per second, however, our software gets 
around 20 samples per second and compress these into one tenth of collected
data.

The temperature sensor was calibrated at the calibration facility of HAKUTO 
Co., Ltd. before the cruise. The results are shown in Table 2.


Table 2:  CTD Calibration contents at laboratory

                            Temperature; linear fit

                      Time              Bias     Slope
                      ----------------  -------  -------
                      Pre-Cruise        -0.0027  0.99977
                      (24 August 1987)


The conductivity sensor was calibrated at sea using data from the measurements 
of salinity collected at 8 stations on PR2 and 5 stations on PR3. The 
salinometer is AUTOLAB model 1601 for the measurements of salinity of the water 
samples. The results are shown in Table 3. The calibration constant is 
determined assuming that the bias zero.


Table 3:  The conductivity scaling factor

                                           Bias  Slope
                                           ----  -------
                      RY7822-7834 (Leg 1)  0.0   0.99958
                      RY7835-7849 (Leg 2)  0.0   0.99978
                      RY7850-7871 (Leg 3)  0.0   0.99965


The temperature in "-.SEA" and "-.CTD" files are described with the 
international practical temperature scale of 1968 (IPTS-68).


2.2  OXYGEN MEASUREMENTS

The determination of dissolved oxygen was done by the modified version of the 
Winkler method described in "Kaiyo Kansoku Shishin (Manual on Oceanographic 
Observation)" published by the Japan Meteorological Agency(1970). The reagent 
blank was not subtracted. No estimation of accuracy and precision has been 
done.

Because no temperature data when samples were taken from bottles are recorded, 
it was assumed that the density of samples is 1022.156 kg/m3 (which assume the 
temperature for 28 degree C and salinity for 34.68) and use this value to 
convert from µmol/l to µmol/kg.


2.3  Nutrients Analyses

The nutrients analyses were done by the Technicon Auto Analyzer II described in 
"Kaiyo Kansoku Shishin (Manual on Oceanographic Observation)" published by the 
Japan Meteorological Agency(1970). No estimation of accuracy and precision has 
been done.

Because no temperature data while analyses are recorded, it was assumed that 
the density of samples is 1022.156 kg/m3 (which assume the temperature for 28 
degree C and salinity for 34.68) and use this value to convert from µmol/l to 
µmol/kg.


2.4  Noted for the -.SUM, -.SEA and -.CTD files

2.4.1  -.SUM

The positions of observation stations were recorded at the beginning and end of 
the observation and these values were only recorded in minutes, so we describe 
the averaged position as the bottom (BO).

Since the surface water samples were taken by a stainless steel water bucket, 
"Number of bottle" includes this bucket sampling.


2.4.2  -.SEA

Our following parameters have the less precision than the required, we describe 
the last digit of data as blank to meet the data format: CTD temperature, CTD 
salinity, salinity, oxygen and nitrates.


2.4.4  -.CTD

CTD temperature and salinity data have the less precision than the required, we 
describe the last digit of data as blank to meet the data format.

The number of samples averaged at the pressure level was not available because 
our software was not recording the number of data during data processing.



3.  REFERENCES

Japan Meteorological Agency, 1970: Kaiyo Kansoku Shishin (Manual on 
    Oceanographic Observation). (in Japanese)



WHPO DATA PROCESSING NOTES

Event Date  Contact        Date Type          Summary 
----------  -------------  -----------------  ----------------------------------
2000-08-04  Saiki, Masaro  BTL                Data are public
            I am pleased to inform you that the PIs and participants of the one-
            time and repeat cruises conducted by the Japan Meteorological 
            Agency's vessels agreed to change most of the data status to public. 

2000-08-28  Buck, Heidi    CTD/BTL/SUM        Data added to website 
            Added SUM, CTD, and BOT to website. Data are public. BOT file has 
            some errors. 

2000-11-27  Uribe, Karla   Cruise Report      found in 'sum file' directory 
            2000.11.27 KJU
            File contained here is a CRUISE SUMMARY and NOT sumfile. 
            Documentation is online.

            2000.10.11 KJU
            Files were found in incoming directory under whp_reports. This 
            directory was zipped, files were separated and placed under proper 
            cruise. All of them are sum files.
            Received 1997 August 15th.

2001-01-31  Uribe, Karla   BTL                See Note: 
            Carriage returns were removed from bottle data. The only error found 
            with the bottle data was the following: following stn/csts had 
            duplicate depths: RY7830/ 1 RY7830/ 2 station/casts converted= 56

2001-04-17  Uribe, Karla   BTL                Exchange file online 
            Bottle file was converted into Exchange format. Website now contains 
            a link to the CSV file.

2001-10-30  Uribe, Karla   SUM                Reformatted data online 
            Small reformatting was done to the sumfile. 

2001-11-07  Uribe, Karla   CTD                Exchange file online 
            CTD data has been converted to exchange format using the new WHPO 
            code. Old file has been put inside the original directory and new 
            file has been put online.

2002-07-18  Uribe, Karla   CTD                file headers corrected, put online 
            Original CTD files had a slight formatting problem in the Expocodes. 
            The / were replaced by _.  New files online. 















