Deutsches Ozeanographisches
Datenzentrum Inventur der Alkor-Reise 355 (DOD-Ref-No.20100331)
Inventory of Alkor Cruise 355 (DOD-Ref-No.20100331)

Plattform
Platform
Reise-Nr.
Cruise-No.
Zeitraum
Period
Projekt
Project
Arbeitsgebiet
Working area
Alkor 355 29.05.2010 - 21.06.2010 HYPOX
 
Baltic Sea Gotland Basin  

Fahrtleiter
Chief Scientist
Institut
Institute
Auslaufhafen
Port of departure
Einlaufhafen
Port of return
Stationskarte
Station map
Schiffsroute
Trackchart
Pfannkuche Olaf Leibniz-Institut fur Meereswissenschaften an der Universitat Kiel Kiel Kiel   

Ziel der Reise / Objectives of Cruise:

Cruise AL-355 was carried out within the framework of the FP-7 project "HYPOX" (In situ monitoring of oxygen depletion in hypoxic ecosystems of coastal and open seas, and land-locked water bodies). The scientific objectives focussed on redox-dependent nutrient and nitrogen cycles in the benthic boundary layer of the suboxic to anoxic Gotland Basin. The scientific party comprised of scientist from the IFM-GEOMAR, Kiel (Germany). Main objectives were to study release rates and inventories of nutrients and nitrogen compounds under varying degrees of bottom water oxygenation in the anoxic to suboxic eastern Gotland Basin (central Baltic). Another goal was to quantify source/sink mechanisms of the benthic boundary layer for nitrogen species and nutrients under changing oxygen conditions to assess potential feedbacks on the upper mixed layer processes. In order to obtain these goal, we monitored the water column, sampled surface sediments and deployed several landers along a transect from oxygenated to suboxic and anoxic benthic boundary layer conditions in the Latvian part of the eastern Gotland Basin. The cruise started and ended in Kiel (Germany) and led directly to the eastern Gotland Basin. Station work was carried out between 57?18'N and 57? 30'N on a transect in the Latvian EEZ beyond the 50m depth contour into the deeper part of the Gotland Basin (210m). The Port of Ventspils (Latvia) and the port of Visby (Gotland, Sweden) were visited.

Messungen / Measurements

Institut
Institute
Wissenschaftler
Scientist
Anzahl
Number
Einheit
Unit
Typ der Messungen
Type of measurements
Kommentar
Comments
Daten im DOD
Data in DOD
IFMGEO Sommer Stefan 14 stations G04
Core-soft bottom (no. of cores)
Multiple corer samples for sediment geochemistry no
IFMGEO Pfannkuche Olaf 15 transects G08
Bottom photography
video films and still photos of the sea floor no
IFMGEO Sommer Stefan 2 stations G71
In-situ sea floor measurements
near seafloor oxygen measurements, eddy corelation technique no
IFMGEO Sommer Stefan 3 stations G71
In-situ sea floor measurements
Lander deployment sediment profiling oxygen microsensors no
IFMGEO Sommer Stefan 8 stations G71
In-situ sea floor measurements
Lander deployment of benthic chamber (in situ uptake of oxidants and nutrient and fluxes) no
IFMGEO Pfannkuche Olaf 12 stations H10
CTD-Stations
vertical depth profiles CTD/Rosette watersampler, water chemistry no
23.3.2024