A      Cruise Report:  SR01

A.1    Cruise Narrative

A.1.1  Highlights

WOCE Line         SR01
Expocode          20VDSR0198_1
Chief Scientist:  Ximena Jara U.
                  Servicio Hidrográfico y Oceanográfico de la Armada (SHOA).
                  Errázuriz 232, Playa Ancha.
                  Valparaíso, Chile.
                  Teléfono:  56-032-266666
                  Fax:       56-032-266542
Ship              AGOR60 - Vidal Gormaz.
Ports of call     Punta Arenas, Chile
Cruise Dates      November 28 - December 13, 1996


A.1.2  Cruise Summary

Cruise Track: 
The cruise track and station locations are shown in figure 1.

Number of stations: 
A total of 15 hydrographic stations were performed using a CTD sealogger 25.

Sampling:  
continuos profiles of  temperature and salinity were made using a CTD. 

Floats, Drifters, and Moorings: 
(None)

A.1.3  List of principal Investigators

NAME                    RESPONSIBILITY               INSTITUTION
----------------------------------------------------------------
EaC. Sra. Ximena Jara   Chief of watch 1,computer operator  SHOA
EaC. Sra. Wanda García  Chief of watch 2,computer operator  SHOA
Sr. Raul Estrada        SHIP messages sender                SHOA




A.1.4  Scientific Programme and methods

The principal objectives of the cruise were:

To collect necessary information to increase the scientific knowledge of the 
dynamic of the Antarctic Circumpolar Current at Drake Passage in order to 
contribute to international WOCE program.

Preliminary Results

A.1.5  Major Problems Encountered on the Cruise

Major problems during the realisation of the cruise, were the continuous passing 
of weather fronts through the study area, making difficult the sampling and 
damaging the instruments.

A.1.6  Other Observations of Note

A.1.7  List Of Cruise Participants
           
NAME                    RESPONSIBILITY                              INST.
-------------------------------------------------------------------------
EaC. Sra. Ximena Jara   Chief of watch  1, computer operator.       SHOA
EaC. Sra. Wanda García  Chief of watch  2, computer operator.       SHOA
S1° M. Placencia        Winch operator, XBT launcher                SHOA
S2° R. Castro           Seabeam & CTD manoeuvre                     SHOA
C1° J. Bravo            CTD & rosette manoeuvre, METEO/SHIP sender  SHOA
C1° J. Freire           CTD & Rosette assistant                     SHOA
M. P. Bizama            CTD & XBT launches                          SHOA
Sr. R. Estrada          SHIP messages                               SHOA
S1°. P. Urzúa           CTD assistant                               SHOA
C1° J. Caro             Winch operator                              SHOA
C2° A. Martinez         Seabeam operator                            SHOA
M° C. Saavedra          CTD and XBT launches                        SHOA



A.2  Underway Measurements

A.2.1  Navigation:
       (Not available)

A.2.2  Echosounding:
       (Not available)

A.2.3  Acoustic Doppler Current Profiler (ADCP):
       (None)

A.2.4  Thermosalinograph Measurements:
       (None)

A.2.5  XBTs
A total of 17 XBT launches (T7) were performed.

A.2.6  Meteorological Measurements
Meteorological data measured were : wind speed and direction, air temperature, 
atmospheric pressure.
  


A.3  Hydrographic Measurement Techniques and Calibration

A.3.1  Sample Salinity Measurements
Salinity water samples were obtained at stations 3 and 8 at 5, 550, 1000, 1500  
and 2000 m. These samples were analysed in situ through a PORTASAL salinometer 
model 8410.

A.3.2  Sample Oxygen Measurements:
       (Not sampled)

A.3.3  Nutrients:
       (Not sampled)

A.3.4  CFC:
       (Not sampled)

A.3.5  Samples taken for other chemical measurements:
       (None)

A.3.6  CTD Measurements
The CTD used was a Sealogger-19 model 1240 bought by SHOA in 1992, whose first 
calibration was made in 1995.   

A.3.7  CTD Data collection and processing

Data Registry

DATE         STATION
------------------------
11/30/1996   1, 2, 3
12/01/1996   4,5,6
12/02/1996   7,8,9,10
12/03//1996  11,12,13,14
12/04//1996  15
           

CTD SBE-25 

It was bought by SHOA in 1995 and it first calibration was made in 1997. 
Therefore, the calibration coefficients used  were the ones from the 1995 with 
the slope and offset  calculated from the lineal time drift.

Temperature
 G =    4.84362130E-03   Slope = 1
 H =    6.77464130E-04  Offset = 0.0118
 I =    2.72222137E-05  
 D =    2.21258685E-06  
F0 = 1000.000  


Day  B    n   Post-delta(t)  b /n        offset
-----------------------------------------------
30  521  773  -0.01746       0.6739974  -0.0118
 1  521  773  -0.01746       0.6752910  -0.0118
 2  521  773  -0.01746       0.6765847  -0.0118
 3  521  773  -0.01746       0.6778784  -0.0118
 4  521  773  -0.01746       0.6791720  -0.0118

             b:  number of days between calibration and the day of CTD cast.
             n:  number of days between calibrations.
Post-delta (T):  temperature-drift value according calibration certificate.

Conductivity:
M =   4.5             Offset = 0
A =   7.19611919E-06   Slope = 1
B =   5.41883750E-01  
C =  -4.14061857E+00  
D =   1.34395405E-04  
                       Cpcor = -9.57E-08


Pressure
A0 =   5327.7010
A1 =  -1.379409E+00
A2 =  -4.139641E-09


Therefore, one *.con configuration files was created (SR1-96.con)

According to the chemical salinity analysis to water samples from this cruise 
and two others performed in a row (CIMAR FIORDO and Bransfield Cruises performed 
just before and after SR1-96), a constant difference between salinity bottle 
values and salinity values obtained by the CTD (just corrected by temperature) 
were observed . The CTD salinity values were 0.05 PSU lower than bottle values. 
Therefore , CTD was just corrected  by temperature and a value of 0.05 PSU were 
added to the salinity values.

Processing

Step 1
1. Convert data from  *.hex to  *.cnv format using DATCNV program and  *.con 
   configuration file.
2. Deleting negatives velocities using the leewoce.bas program 
3. Checking and cleaning the header files.
4. Computing the average down velocity value (X).
5. to apply the Aling CTD program to correct temperature and conductivity time 
   response shift  from the CTD'sensors.

Step 2
To apply DATCNV program to average observed values meter by meter.

Step 3
To apply Winfilter program to filter data after step 2, using a flexible windows 
determined by the user.


A.3.8 Satellite image acquisition and processing :
      (None)
  
A.3.9 Shipboard computing:
      (None)


Note: All data from WOCE PR14 and SR1 cruises, have been passed to the National 
      Oceanographic Data Center of Chile (CENDOC) for data management purposes 
      and to be quality controlled according to normal WHPO procedures. Once 
      finished they have been sent to the WOCE Hydrographic Program Office at 
      the Scripps Institution of Oceanography for archival. For major 
      information write to:

                                 Ricardo Rojas
                                Chief of CENDOC
                                 Casilla 324
                                  Valparaiso
                                    CHILE
                             e-mail rrojas@shoa.cl

      who can canalize your request to the appropriate  decision channels. Do 
      not write directly to Principal Investigators.


Figure 1.  Position of stations during WOCE SR1 1996.





