WHP Ref. No.: IR1W/ISS2
Last updated: 14 December 1994

				Cruise report 
				"Sonne" cruise 89	
A.	 Cruise narrative

A.1.	 Highlights
a.	 WOCE designation: 	IR1W and ISS2
b.	 Expedition designation:06BE89/1
c.	 Chief scientist: 	Prof. Dr. F. Schott
				Institut für Meereskunde
				Universitat Kiel
				Dusternbrooker Weg 20
				24150 Kiel, Germany
				Telephone: +49-431-597-3820
				Telefax: +49-431-597-3821
				Telex: 17431793 IFMKIEL
d.	 Ship: 			Sonne
e.	 Ports of call: 	Colombo, Sri Lanka to Karachi, Pakistan
f.	 Cruise dates: 		August 4 to August 30, 1993

A.2.	 Cruise Summary Information

a.	 Geographic boundaries: Stations along IR1W were primarily located 
along 8¿N (IR1W) between 54¿E and 77¿E. Additional stations that fall both 
on IR1W and within the ISS2 Special Study area are located between 6¿N and 
19¿N from 51¿E to 59¿E.

b.	 Stations occupied: 99 CTD/rosette stations were occupied during the 
cruise. 62 of these stations fall along IR1W with the other 37 located 
within the ISS2 area.
Water sampling on the cruise included measurements of salinity, both by CTD 
and bottle sample oxygen determinations, CTD temperature. Tracer analysis 
were made for F-11 and F-12, but reliable values were gained only for F-11.

c.	 Floats and drifters deployed: None reported. 

d.	 Moorings deployed or recovered: None reported. 

A.3.	 List of Principal Investigators

Parameter/Instrument 	Sampling group	Responsible Investigator
CTD/O2 / Rosette 	IfM Kiel	Lothar Stramma
Chlorofluorocarbons 	IfM Kiel	Monika Rhein
ADCP 			IfM Kiel	Jurgen Fischer
Salinity 		IfM Kiel	Lothar Stramma
Oxygen 			IfM Kiel	Monika Rhein
XBTs 			IfM Kiel	Lothar Stramma

A.4.	 Scientific Programme and Methods

SONNE cruise 89 focused on the study of the circulation and water mass of 
the Arabian Sea. The investigation was carried out in the context of the 
World Ocean Circulation Experiment (WOCE). Cruise objectives were the study 
of water mass and heat exchange at the entrance of the Arabian Sea during 
the summer monsoon, the investigation of the outflow of the Somali Current 
region to the north and the investigation of upwelling off the Oman coast.

SONNE left Colombo, Sri Lanka on 4 August 1993 at 21:00 local time heading 
towards the southwest Indian coast. A test station was done at 7¿29.8¿N, 
78¿14.8¿E. The CTD section along 8¿N started with CTD station 2 at 
7¿59.98¿N, 76¿51.97¿E. On 15 August at station 50 at 8¿01¿N, 53¿55.21¿E the 
200 miles zone of Somalia was reached. As no research permission for Somalia 
waters was obtained, some CTD stations were made along the 200 mile zone of 
Somalia, or within the Yemen waters at the border to the Somalia waters.

Although the winds increased due to the summer monsoon off the African 
continent, CTD measurements were still possible, although sometimes without 
water bottles, as R/V SONNE showed very good performance during rough 
weather.

In the last week of the cruise, CTD stations were made in the Owens Fracture 
Zone and off the Omani coast. The ship reached Karachi on 28 August, where 
the cruise SONNE 89 terminated.

A.5.	 Major Problems and Goals Not Achieved
None reported.

A.6.	 Other Incidents of Note
None reported.

