SECTION 1: CRUISE SUMMARY

PRE-WOCE ISS01, RRS DISCOVERY CRUISE 165A
MOORED CURRENT METER RECOVERY FROM THE AGULHAS CURRENT AND 
RETROFLEXION REGION

Expedition Designation (EXPOCODE) 74DI165A_1

Chief Scientist:		James Luyten
				WHOI,USA
PI for Hydrography;		Raymond T. Pollard
				IOS, Deacon Laboratory, UK
				Now at
				School of Ocean and Earth Sciences,
				Southampton Oceanography Centre,
				University of Southampton,
				Empress Dock,
				Southampton, SO14 3ZH, UK
				E-mail: rtp@soc.soton.ac.uk

Ship: RRS Discovery owned and operated by the Natural Environment 
Research Council, UK and chartered to the Woods Hole Oceanographic 
Institution.

Ports of Call: Port Louis, Mauritius to Cape Town, South Africa.

Cruise Dates:  28 January 1987 to 25 February 1987.

CRUISE OVERVIEW

Cruise Track
	The cruise track and station locations are shown in Read et al.  
(1987) and repeated in Luyten et al. (1990). 

Number of Stations
	A total of 10 CTD/Rosette stations were occupied employing a 
12 place 2 litre  Niskin Bottle Rosette with a Neil Brown CTD.

Sampling
	Water samples measurements were made for salinity and 
oxygen. Although CTD data were carefully reconciled with the 
sample values the latter are no longer available.

Current meter moorings
	The data from these moorings is lodged with the WOCE current meter
DAC,Oregon in its historical (non-WOCE) collection. It can be found via
the name of the PI, J.R.Luyten, or via the experiment name,
Agulhas Retroflection.


SECTION 2: SCIENTIFIC PROGRAMME

	The primary objective of the cruise was to recover ten moorings
set two years earlier in the Agulhas Current and Retroflexion Zone 
off southern Africa. A full depth CTD cast was done in the vicinity 
of each mooring and 3700km of SeaSoar sections were run in the 
Agulhas Retroflexion Zone.
	A brief narrative follows. After leaving port Discovery steamed 
for and recovered mooring WHOI No. 843. After recovering a second 
mooring (842) SeaSoar was launched and towed approximately parallel 
to the path of the Agulhas current until the next group of moorings 
was reached. There moorings 841, 840, and 839 were recovered. The 
SeaSoar was deployed for a three-day run to the next mooring (837) 
while making a section across the Agulhas. Moorings 837, 838, 834, 
and 835 were recovered with tows between them. After recovery of the 
final mooring 836, the remainder of the cruise was spent towing 
SeaSoar. The time in the water was curtailed by heavy weather, and the 
cruise was curtailed by a serious fire in the Engine Room.


SECTION 3: UNDERWAY MEASUREMENTS

A) SEASOAR
	Seasoar - towed yoyo CTD measurements were made between the 
surface and a nominal 400m depth along 3700km of track. These data 
can be recovered from the British Oceanographic Data Centre (BODC) 
and information concerning them can be found in Read et al. (1987).

SECTION 4: STATION MEASUREMENTS - CTDS

As noted above a full depth CTD station was made at the location of 
each mooring; thus ten casts were made. A CTD station list can be 
seen in the Summary file.  All casts were made with the IOS Neil 
Brown Instrument Systems "New Deep CTD" and were made to full ocean 
depth.  A transponder attached to the CTD frame was used to make 
casts to within 20m of the bottom whenever a good bottom echo could 
be seen.

Procedures for calibrating and verifying the data are described in 
Read et (1987) and can also be found in the documentation for the 
previous cruise, namely Discovery 164, made the previous month with 
many of the same IOS personnel on board. 

REFERENCES

Luyten, J., Spencer, A., Tarbell, S., Luetkemeyer, k., Flament, P., 
Toole, J., Francis, M., and Bennett, S. 1990. Woods Hole 
Oceanographic Institution Technical Report WHOI-90-30, 100pp.

Read, J.F., Pollard, R.T. and Smithers, J. 1987. CTD and SeaSoar data 
from the Agulhas Retroflection Zone. Institute of Oceanographic 
Sciences, Report, No. 245, 91pp.

