R/V Chofu Maru Cruise NC9410


1 Cruise Narrative


1.1 Highlights

Expedition Designation   Chofu Maru Cruise NC9410

Chief Scientist          Kan Kimura, NMO

Ship                     R/V Chofu Maru

Port of Call             None

Cruise Dates             Leg 2: October 16 to October 20, 1994


1.2 Cruise Summary

     Observations of PR19 were carried out as a part of the R/V
Chofu Maru Cruise NC9410 Leg 2. The ship sailed from Naha at 0500
UTC on 16 October 1994. By 0922 UTC on 17 October, the ship was at
the first station of a section PR19. The observations of IS line
finished at 1836 UTC on 18 October, and the ship entered port of
Ishigaki. However,we interrupted the observation of PR19 because
the Typhoon 9431 was approaching and almost stayed near NS line.

       The cruise track and station locations are shown in Figure
1. Water sampling on the cruise included measurements of salinity
both by CTD and by water bottle samples, CTD temperature, bottle
sample oxygen determination, and nutrients (nitrates, nitrites, and
phosphates).


1.3 Principal Investigators for All Measurements

     The principal investigators for all the parameters measured on
the cruise are listed in Table 1.


Table 1. Principal Investigators for All Measurements

       Name           Responsibility      Affiliation

      T. Hinata        CTD,S                 NMO
      K. Kimura        O2,Nutrients          NMO


1.4 List of Cruise Participants

     The cruise participants are listed in Table 2.


Table 2. Cruise Participants

       Name           Responsibility      Affiliation

      NC9410 Leg 2     Naha to Ishigaki    16 Oct. to 20 Oct.

      K. Kimura        Chief Scientist,       NMO
                       O2,Nutrients
      E. Moriyama      O2,Nutrients           NMO
      T. Shiga         CTD software,S         NMO
      N. Nagai         O2                     NMO
      H. Daimon        CTD hardware           NMO
      J. Jifuku        O2,Nutrients           NMO
      M. Ishizaka      Watch Stander          NMO
      S. Wakaki        Maritime Meteorology   NMO
      T. Tashiro       Maritime Meteorology   NMO

                                                  T.H


2. CTD

     The NBIS Mark III B CTD (6500 dbar sensor without oxygen
sensor) mounted on the 12 x 1.7 Liter General Oceanics rosette
multisampler frame was used for all of the vertical CTD work. At
some stations of which depth are deeper than 1,000 meters, the
PREUSSAG acoustic pinger was mounted on 10 meters above the frame.
At other shallower stations, the package was lowered to the depth
of 95 percents of the bottom depth without the acoustic pinger.

     The performance of the CTD and multisampler was good
throughout the cruise.

     The details of the data collection and data processing methods
are described in "CTD Full Sampling and Data Processing Method Used
at Nagasaki Marine Observatory". These methods were based on
Millard and Yang ( 1992 ).

     The results of the laboratory calibration for the temperature
and pressure are shown