The Mixing Zephyr Pages

Mixing Zephyr Current Meter Mooring


Prior to the first Mixing Zephyr cruise, Rick Thomson of the Institute of Ocean Sciences sucessfully deployed a dual current meter mooring (sketched at right; click on it to see enlarged version). The mooring supported two meters, 25 and 300 meters above the bottom and was located ~200 meters ENE of the Main Endeavour Vent Field (dropped at ). Since the seafloor there is at a depth of 2200 meters, the depths of the two meters was ~2175 and ~1900 meters, respectively.

60 days of data were received by the UW from the IOS, and were collected between 24 May and 23 July (Julian days 144.049-204.132). Good data begin at Julian day 149.04861 = June 29 1:10 UTC, about the time that the meter was deployed and on the seafloor.

For comparison, the dates of the two cruises were:

Leg I
Atlantis II/Voyage 132/Leg 08
May 25-June 19, 1995
First Tow: May29 Julian day 149
Last Tow: June16 Julian day 167

Leg II
Atlantis II/Voyage 132/Leg 13
September 15-28, 1995

This indicates that we have current measurements only during the first Mixing Zephyr cruise.

www.geolab.nrcan.gc.ca/cgi-bin/geomag/MIRP/run_mirp suggests that the magnetic declination in 1995 was
20o 32' E of N at latitude 047o 57' N and longitude 129o 06' W

The following is the header of Ayplee's note that accompanied the raw data. An example of the raw data records is appended.

UW  1900  010 124 595UTC     0 0.0N  0 0
.0WSTrXV  5970    10 0   8653  6   0.000                        

> notes on above lines:
> 1900 is height off bottom
> 9 digits before UTC are reverse time/date
> 5970 is the serial number of the current meter
> 8653 is number of records

                                                                
5970/UW Vent 95                                                 
                                                                
   salinity   temp      cond.     exp. t   direc       speed
     (ppt)    (c)                  (c)     (true n)    (m/s)
(12F10.3)
    22.227 81750.992     0.567     7.602   319.381     0.017
...
    35.471     1.967     0.745     1.982   248.608     0.218
    35.471     1.967     0.745     1.982   226.350     0.192
    35.471     1.944     0.745     1.982   204.499     0.112
    35.471     1.944     0.745     1.982   189.030     0.077
    35.471     1.967     0.745     1.982   191.491     0.237
    35.471     1.944     0.745     1.982   188.679     0.205
    35.471     1.944     0.745     1.982   184.811     0.108
    35.471     1.967     0.745     1.982   187.975     0.037
...





--SRV

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