A.    Cruise Narrative

A.1   Highlights

                     WHP Cruise Summary Information

         WOCE section designation  PR03
Expedition Designation (EXPOCODE)  49RY9111_1
                 Chief Scientist:  Akihiro Kikuchi,
                                   Japan Meteorological Agency,
                                   1-3-4, Otemachi, Chiyoda-ku,
                                   Tokyo 100, Japan
                             Ship  R/V Ryofu Maru
                    Ports of Call  Leg 1: Tokyo, Japan to Shimizu, Japan
                     Cruise Dates  Leg 1: November 15, 1991 to December 1, 1991
               Number of Stations  13
                                                 35° 0.00'N
          Geographical boundaries  143° 57.00'E            144° 4.00'E
                                                 23° 8.00'E

A.2   Cruise Summary

Cruise Track

The cruise track and station locations are shown in Figure 1. Observations of 
PR3 were carried out as part of the R/V Ryofu Maru cruise RY9111 Leg 1.

Number of Stations

A total of 13 CTD/rosette stations 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. 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. Surface water samples were collected by 
a bucket at every station.

List of Principal Investigators

The principal investigators responsible for each parameter 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 (Hewlett 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 and pressure sensor were 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 (12 January 1991)  +0.1246  0.999874
                    
                Pressure(increase); linear fit
                  Time                          Bias     Slope
                  ----------------------------------------------
                  Pre-Cruise (16 January 1991)  -0.8331  1.000787


The conductivity sensor was calibrated at sea using data
from the measurements of salinity collected at 4 stations. The
salinometer is Guildline Portasal model 8410 for the measurements
of salinity of the water samples. We used the batch P112 of IAPSO
as standard sea water to calibrate the salinometer. 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
                                                --------------
                  RY8061-8073                   0.0   0.99930


The temperature in "-.SEA" and "-.CTD" files are described with the 
international temperature scale of 1990 (ITS-90).


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, 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 of 
    Oceanographic Observation). (in Japanese)


WHPO SIO Data Processing Notes


Date      Contact     Data Type    Data Status        Summary  
------------------------------------------------------------------------
11/09/01  Uribe       CTD          New CSV file added  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.

06/08/01  Uribe       CTD          New CSV file added  CTD were put into exchange
          format and the individual file names were modified. New zipped CTD file 
          has been linked to website.

04/13/01  Uribe       BTL          CSV file added      Bottle file carriage
          returns were fixed. Bottle file was converted into Exchange format.
          Website now contains a link to the CSV file.

08/15/00  Bartolacci  CTD/BTL      Data decrypted      As per Masaro Saiki the
          bottle and CTD files for these cruises have been unencrypted and made
          public. All index pages have been edited to reflect this change.

08/04/00  Saiki       CTD/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.

09/29/99  Buck        CTD/BTL/SUM  Online/Encrypted    

