Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Polarstern	PS89 ANT-XXX/2	02.12.2014 - 01.02.2015	HAFOS	South Atlantic Ocean

Fahrtleiter Chief Scientist	Institut Institute	Auslaufhafen Port of departure	Einlaufhafen Port of return	Stationskarte Station map	Schiffsroute Trackchart
Boebel Olaf	Alfred-Wegener-Institut fur Polar- und Meeresforschung	Cape Town	Cape Town

Ziel der Reise / Objectives of Cruise:

The Antarctic Polarstern expedition PS89 was initially scheduled to reach from Cape Town via Atka Bay (Neumayer III station) through the Weddell Sea to Punta Arenas. However, the pitch control system of the portside propeller suffered an irreparable damage during our stay at Atka Bay, which we had entered for logistic services for Neumayer III station. This failure reduced the vessel's performance and manoeuvrability to such degree that decision was made to cease the expedition and return to Bremerhaven via Cape Town to have the necessary repairs undertaken as soon as possible. This led to the revised route from Cape Town to Atka Bay and back to Cape Town. The expedition was dedicated to logistic and scientific purposes. The logistic aims (supply of Neumayer station with fuel and goods) were successfully reached while less than half of the scientific programme could be carried out, namely the part that could be implemented until we had reached Atka Bay. The scientific work was characterised by station-based, sea ice-based, ship-based and helicopter-borne activities. The station-based work comprised: ? Recovery of 13 deep sea pressure gauges along the Good Hope section, (of 14 planned) ? Recovery/deployment of 6/6 moorings east of Neumayer station (of 7/5 planned) ? Recovery/deployment of 0/0 moorings west of Neumayer station (of 14/11 planned) ? Deployment of 15 Argo floats (of 28 planned) ? Deployment of 12 SOCCOM floats (of 12 planned) ? 94 CTD casts with rosette ? Calibration of 6 RAFOS sound sources ? Analyses of approximately 4000 water samples ? Sampling of deep sea bottom using multicore (2). Ship-based research consisted of: ? Surveys of birds, seals, and whales ? Measurement of temperature, salinity, and current profiles ? 18 SUIT hauls, 8 out of those under sea ice (of >30 planned) ? 15 RMT hauls, 6 out of those in ice covered areas (of >20 planned) Sea ice-based research included: ? 5 ROV ice stations (2 out of those on drifting sea ice, of 12 planned) ? Deployment of 12 sea ice buoys (of different types, of 22 planned) ? 3 ice core stations (of 6 planned) ? 2 ice thickness transects using sledge (of 0 planned) Helicopter-borne work amounted to 116 flights with 84:32h of cumulative flying time. Out of 116 we carried out: ? 20 flights for animal observations (out of approximately 60 planned) ? 5 flights for EM bird transects (out of 15 planned). Other flights were undertaken to mark ice floes, for testing of instruments, logistic flights for ice stations, and for transportation of researchers and material to and from Neumayer station.

Messungen / Measurements