Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Polarstern	PS127 Transit	05.12.2021 - 04.01.2022		Atlantic Ocean

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

Ziel der Reise / Objectives of Cruise:

On 05 December 2021, Polarstern will start its Antarctic expedition 2021/2022 with cruise leg PS127, the Atlantic transit. Physical, biological and chemical seawater parameters as well as atmospheric measurement parameters will be measured continuously. Training on hydroacoustic measurement systems will be conducted. Latest developed and newly installed measurement systems will be tested. Within the Oceanet project (TROPOS) material and energy fluxes between ocean and atmosphere are investigated. Since 11 years, measurements are performed with a custom-built measurement container on Polarstern during expeditions in the northern and southern hemisphere. The measurements regularly include radiation and microwave remote sensing as well as laser-based measurements (lidar) of aerosols and clouds profiles. Measurement systems permanently integrated into the ship continuously measure defined seawater parameters such as CO2 content, algal pigments, salinity and temperature along Polarstern's transit route. These and other en-route measurements contribute to investigations during expeditions and to a scientific understanding of important processes and their changes on larger space and time scales. Hydroacoustic measurement methods are important investigation methods for seafloor and ocean research. They are regularly used on Polarstern to investigate the topography and sediment structure of the seafloor, among other things. On cruise leg PS127, training is provided for the use of the Hydrosweep multibeam sounding system used for bathymetry, as well as for the parametric sediment echosounder Parasound. Polar and marine research requires a continuity of measurements (long-term data sets) as well as a continuous development of measurement methods and equipment. Latest developed and newly installed measurement systems are tested on PS127. This includes the test of a Clean CTD with water sampler, a winch system specially designed for the application and cleanroom container. The Clean-CTD will be used to sample seawater in the water column free of trace metal contaminants during subsequent expeditions.

Messungen / Measurements