HAUSGARTEN 2013 - Cruise No. MSM29 - June 23 - July 12, 2013 - Tromsø (Norway) - Tromsø (Norway) (English)

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Cruise leg MSM 29 investigated the consequences climate changes and the decline in sea ice has on Arctic ecosystems, which is one of the most important challenges for Earth Sciences. Rapidly changing physical and chemical conditions, as observed and projected for the future, will affect the ecosystem functioning including productivity, remineralisation, and energy flow between ecosystem compartments. The cruise had two main working areas: the deep-sea long-term observatory HAUSGARTEN in the eastern Fram Strait, and the long-term Kongsfjord transect (3 sites on the continental shelf off Svalbard). HAUSGARTEN observatory includes 17 permanent sampling sites along a depth transect (1,000 - 5,500 m) and along a latitudinal transect following the 2,500 m isobath. Unfortunately it was not possible to reach all observatory sites due to the present sea ice cover in the region during the duration of our cruise. Sediment from TV-guided MUC sampling will be analysed to estimate the input of food/energy to the seafloor, benthic activities, and the total biomass of the smallest sediment-inhabiting organisms. Water samples from CTD/rosette casts are used to investigate biogeochemical parameters as well as phytoplankton and bacteria communities in surface layers. AUV dives at the ice edge were used to obtain high-resolution biogeochemical profiles in the water column. Targeted measurements and sampling at the seafloor and in the water column as well as the installation of bioturbation experiments were achieved by several ROV dives. The cruise added to the long-term ecosystem time-series study at the deep-sea observatory HAUSGARTEN and contributed to the HGF-Research-Program PACES, the ERC project Abyss and the BMBF project TRANSDRIFT.