Mooring instrumentation

Lancaster Sound is 65 km wide at the mooring site and reaches depths of 285 m (Fig. 1). Annually the mooring array has been recovered and re-deployed in late summer using Canadian Coast Guard icebreakers, at which time CTD profiles and water samples for chemical tracer analysis have been collected. Instrumentation of the array has increased through the years as additional instrumentation became available (Prinsenberg and Hamilton 2005). Mobile and land-fast pack ice conditions are found normally for 10 months of the year. Ice ridge keels within the pack ice are a threat to moorings which, for this reason, were designed not to extend into the top 25 m of the water column. Instrumentation includes Acoustic Doppler Current Profilers (ADCPs) to monitor ocean and ice velocities, Upward Looking Sonars (ULSs) to monitor ice drafts, and CTD units (MicroCats) to monitor water column properties at various depths. Figure 2 shows the array used for the 2003-04 deployment, which also included Tide Gauges and a CTD profiler called ICYCLER. Further descriptions of the instrumentation, data analysis and high frequency ocean variability can be found in Prinsenberg and Hamilton (2005).

Fig. 1. Map of the eastern Canadian Arctic Archipelago (CAA) section of the NW Passage showing the CTD transects as solid lines, main mooring sites (crosses) in the Barrow Strait-Lancaster Sound region and the north magnetic pole location (Star-1994) which is moving northwards.

Fig. 1. Map of the eastern Canadian Arctic Archipelago (CAA) section of the NW Passage showing the CTD transects as solid lines, main mooring sites (crosses) in the Barrow Strait-Lancaster Sound region and the north magnetic pole location (Star-1994) which is moving northwards.

Distance (nm)

Fig. 2. Lancaster Sound mooring array for 2003-04 looking upstream to the Arctic Ocean with the south shore on the left of the figure and north on the right (37 nm equals 65 km).

Distance (nm)

Fig. 2. Lancaster Sound mooring array for 2003-04 looking upstream to the Arctic Ocean with the south shore on the left of the figure and north on the right (37 nm equals 65 km).

0 0

Post a comment