Report of VALDIVIA cruise 152

A. Cruise narrative

Ship: 		Valdivia

Cruise number:	152
Expocode:		06AZ152

Cruise dates: 	start on 26 May 1995 in Hamburg (Germany), 
			end on 23 June 1995 in Cork (Ireland).

Chief scientist: 	Manfred Bersch,
I			nstitute of Oceanography, 
			University of Hamburg
			Troplowitzstr. 7
			22529 Hamburg, Germany. 

Scientific objective:	hydrographic repeat of WOCE section A1E/AR7E and 
recovering of 4 moorings.

Cruise track:	Hamburg - English Channel - Porcupine Bank - Southwestern 
slope of Rockall Plateau - Iceland Basin - Reykjanes Ridge at 59 N - Irminger 
Sea - Cape Farvel - Reykjanes Ridge at 57 N - Cork

Total number of stations:	73, consisting of 4 mooring stations and 69 
CTD/rosette stations.

Moorings: 		4 recovered, with 15 current meters. 

Cruise participants:

Name				Institute	Responsibility

Manfred Bersch		IfM		chief scientist
Randi Eichholz		IfM		CTD
Joerg Feldt			IfM		salinometer, CTD
Kerstin Grotefendt	IfM		CTD
Ines Koeper			BSH		oxygen
Rita Kramer			BSH		nutrients
Wolfgang Lange		BSH		moorings
Anita Leinweber		IfM		CTD
Uwe Paul			BSH		CTD
Franziska Schmiel		IfM		oxygen
Klaus Schulze		IfM		CTD
Helmut Wuellner		IfM		moorings

BSH:	Bundesamt fuer Seeschiffahrt und Hydrographie,
	Bernhard-Nocht-Str. 78, 20359 Hamburg, Germany
IfM:	Institut fuer Meereskunde der Universitaet
	Hamburg, Troplowitzstr. 7, 22529 Hamburg,
	Germany

Notes:

€	Stations No. 1 to 57 were located along WOCE section A1E/AR7E. 
€	Due to sea-ice conditions 2 planned CTD/rosette stations on the 
	Greenlandic shelf were cancelled and another 3 stations above the slope 
	had to be shifted to the south. 
€	Due to good weather conditions during the cruise the reserve of ship time 
	was used to run an additional section of 16 CTD/rosette stations in the 
	Irminger Sea (stations No. 58 to 73).The additional section did not 
	coincide with any WOCE section.

B.	Measurement techniques

CTD:	Seabird 911 plus. Continuous profiles of pressure, temperature, 
conductivity, and oxygen down to about 20 m above the sea bottom. The sample 
frequency is 24 Hz. Downcast velocities were between 0.5 and 1.0 m/s. The 
sensors are regularly calibrated in the laboratory.

ROS:	Seabird rosette. At each CTD station water samples from up to 12 different 
depths were taken during the upcast for the determination of salinity and 
concentrations of dissolved oxygen, phosphate, nitrate, and silica.

Altimeter:	The CTD/rosette was equipped with an altimeter, measuring the 
distance to the sea bottom.

Mechanical thermometers: Gohla reversing thermometers. Fixed to selected water 
bottles of the rosette for the determination of temperature and pressure at 
different depths.

Analysis of water samples:

salinity: Guildline Autosal salinometer, using standard seawater. 
oxygen: Winkler titration with Metrohm processor 686. 
phosphate, nitrate, silica: Skalar autoanalyzer. 
Navigation: Global Positioning System (GPS). 
Bottom depth: ELAC echo-sounder.
Moorings: 4 moorings recovered with 15 Aanderaa current meters RCM 5, 7, 
and 8. 
Parameters: pressure, temperature, conductivity, current speed and direction.
ID Position (deg.,min.) 
Sampling Depths (m) A4 59 9.1 N 34 0.0 W 269, 882, 2092, 2551 D4 57 34.0 N 28 
9.6 W 542, 1752, 2211, E4 54 25.3 N 25 53.5 W 439, 1041, 2243, 3095 F4 52 23.2 N 
15 28.5 W 853, 1255, 2057, 2504 

Notes:
€	3 CTD/rosette casts were run for test and calibration purposes. 
€	The two upper current meters of mooring F4 had been lost probably due to 
fishery activities.
€	Due to cable and electronic defects the shipmounted Acoustic Doppler 
Current Profiler (ADCP) could not be used.