Weekly Reports Polarstern
The Expedition PS114 Bremerhaven - Tromsø
After leaving Bremerhaven on July 10th, Polarstern cruise PS114 will start with a roughly 5-day transit to the working area: Fram Strait between Svalbard and Greenland. The center of the cruise will a large number of mooring recoveries and deployments that are part of the Helmholtz Infrastructure Initiative FRAM. The cruise will progress from east to west across the working area to service moorings that are part of (i) long-term observations of the West Spitsbergen Current temperature and transport, (ii) long-term observations for sedimentary fluxes to the sea-floor, (iii) a process study aiming to understand the driving forces for algal growth at the ice-edge, (iv) a process study to constrain the seasonal properties of the westward flow in Fram Strait, and (v) a process study to constrain the seasonal flow patterns of warm Atlantic Water on the East Greenland shelf and underneath the 79°North Glacier. On most days in the working area, mooring recoveries or deployments will take place during day time ship working hours. During night hours station-based sampling will take place including the deployment of the CTD rosette, multinet, LOKI, TV multi-corer, and ocean floor observation system. These instruments will measure various physical, chemical, and biological parameters and retrieve water, specimen, and sediment samples for biological and chemical analyses. Underway systems will also operate and biological and chemical samples will be taken at regular intervals from sea-water intakes of Polarstern. Properties to be investigated include (i) phytoplankton, zooplankton, and bacteria abundance, species distribution, and molecular and genetic variability, (ii) primary production, (iii) epibenthic megafauna, (iv) dissolved and particulate inorganic and organic nutrients and carbon, and (v) pathways and emissions of trace gases N2O, CH4, DMS, and CO. Incubations will assess rates of trace gas exchanges under varying forcing. During the transit and in the working area, air samples will be collected for analyses of emerging organic contaminants such as flame retardants. In the western part of the working area, where sea-ice is expected, helicopter operations will retrieve snow samples from sea-ice floes for analyses of emerging organic contaminants. After a shorter transit, the cruise will end in Tromsø on August 3rd.