ArcticNet - ArcticNet Research

Phase 4 (2015-2018)

ArcticNet Long-Term Oceanic Observatories: Continuation and Synthesis of the Existing Decadal Records of Physical and Biogeochemical Signals

Project Leader(s)

Dumont, Dany

ArcticNet Long-Term Oceanic Observatories (LTOO) have been deployed in the Canadian Arctic since 2002. LTOO, or oceanographic moorings, are lines anchored to the seafloor onto which recording instruments are deployed at different depths. These instruments record current speed and direction, salinity, temperature, nutrients, chlorophyll, and ambient noise, including marine mammal vocalizations. Some moorings also carry sediment traps, which are large automated funnels that collect particles sinking from the surface layer of the ocean to the seafloor at regular intervals. Such particles include ice algae, phytoplankton, zooplankton fecal pellets and all sorts of detritus, which are excellent indicators of the intensity of the processes taking place at the ocean surface at times when sampling by ship is not possible. Moorings are deployed and recovered every year, and as years accumulate, the time-series of sinking particles collected by the sediment traps will reflect any long-term change in the ecosystem associated with shifts in temperature, salinity, or sea ice regime. The objective of the last phase of the ArcticNet-LTOO project is to assess variations in the 16-year record to detect any response of the ecosystem to recent physical changes and the expected modifications in the services provided to local communities. Contributes to IRIS: 1, 2