Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Alkor	AL523-2	01.07.2019 - 03.07.2019		Baltic Sea

Fahrtleiter Chief Scientist	Institut Institute	Auslaufhafen Port of departure	Einlaufhafen Port of return	Stationskarte Station map	Schiffsroute Trackchart
Engel Anja	Helmholtz Centre for Ocean Research Kiel (GEOMAR)	Kiel	Kiel	Karte Map

Ziel der Reise / Objectives of Cruise:

The aim of the three-days long AL523.2 cruise was the training of the Master students of the course Biological Oceanography at cruise preparation and field work on board a research vessel. Throughout the three days, the working schedule included a morning and evening station, successively applying a CTD, Lightmeter and a rubber boat to sample the SML. A diverse station plan provided the opportunity to test the influence of terrestrial versus marine derived organic matter on several parameters. The focus was set on the sea surface microlayer (SML) and the influence of the further propagating eutrophication in coastal regions. The analysis of organic matter (OM) cycling included the distribution and abiotic formation pattern of gel particles, optical properties of the samples and measurements of surface activity. Moreover, community activity was assessed as the living sink for accumulated OM. For example, oxygen production and respiration was monitored during incubation. Water column profiling visualized intense stratification, as anticipated for this season. Conclusively, a rather diverse picture emerged showing not only the terrestrial versus marine influence and thus possible linkages of OM cycling to coastal eutrophication but further potentially day/night variability in the assessed parameters.

Messungen / Measurements