The Isfjorden Adventfjorden (IsA) time series station (2011-)

The Isfjorden Adventfjorden (IsA) time series station (2011-)

The UNIS IsA time series station is located in the mouth of Adventfjorden and is affected by the inflow from Isfjorden. It is thus an excellent Arctic model system for studying seasonality, interannual variation and the effects of a warming ocean climate. “Atlantification”, increased inflow of “warm” water from the North Atlantic Current, leads to less sea ice and warmer land temperatures. At IsA we are trying to understand how this affects the marine ecosystem.

The station has been sampled on a weekly to monthly basis year-round since December 2011 by the AB and AGF departments. Data recorded includes vertical CTD (temperature, salinity, fluorescence, oxygen) and light (PAR) profiles. In addition, water samples are analysed for concentrations of inorganic nutrients (nitrate, nitrite, phosphate and silicate), organic particles (POC/PON) and photosynthetic biomass (size-fractionated chlorophyll a). Microbial eukaryotes are collected on filters and analysed by molecular methods to find out who they are and what their role is in the ecosystem. Samples are also collected for microscopy. Zooplankton from the entire water column are caught in nets and either counted under microscope or analysed by DNA barcoding methods. The station and the resulting data are frequently used in courses, as well as master’s and PhD projects. Currently one AB PhD candidate, Cheshtaa Chitkara, is associated with IsA.

Long-term time series stations are critically important for understanding the effects of climate change. As far as we know the IsA station is the world’s northernmost time-series station.

Contact person: Associate Professor Anna Vader.