Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Heincke	HE472	23.09.2016 - 30.09.2016		North Sea

Fahrtleiter Chief Scientist	Institut Institute	Auslaufhafen Port of departure	Einlaufhafen Port of return	Stationskarte Station map	Schiffsroute Trackchart
Koch Boris	Hochschule-Bremerhaven	Bremerhaven	Bremerhaven

Ziel der Reise / Objectives of Cruise:

The major goal of the first leg of the cruise and the master course was to teach biogeochemical methods and research strategies. Based on onboard laboratory analyses, the participants studied nutrient flux in the Elbe and Weser estuaries and its relation to tidThe major goal of the first leg of the cruise and the master course was to teach biogeochemical methods and research strategies. Based on onboard laboratory analyses, the participants studied nutrient flux in the Elbe and Weser estuaries and its relation to tide, primary production, oxygen availability, turbidity and concentration of organic matter. These analyses were compared with depth-dependent results in the open North Sea and with literature data. During the three days of expedition, 20 stations were sampled. On Sunday Sept 25th 6 stations were sampled on the first day on the transect Bremerhaven to Heligoland. Water samples were taken using the water rosette and the CTD. On the second day, samples were taken around the Island of Heligoland. The CTD and the box corer were used on 8 stations. On the third day, during the transect from Helgoland to Cuxhaven, 6 stations were sampled using CTD and water rosette. Along the salinity gradient in the Elbe and Weser Estuary nutrient availability was related to primary production and oxygen concentration. This increased nutrient supply by the rivers correlated with salinity (mixing), higher turbidity and fluorescence and higher concentrations of organic carbon (~319 ?mol DOC/L in the River Weser). The setting within the estuary was compared with the marine conditions near Heligoland where small depth-dependent gradients of temperature were observed. In summary, the observed gradients were smaller compared to previous cruises due to the lack of primary production and stronger storms during this time of the season. However, we entirely reached the methodological aims of this biogeochemical teaching course. Station and oceanographic data: https://doi.org/10.1594/PANGAEA.869429; https://doi.org/10.1594/PANGAEA.

Messungen / Measurements