The sub-project of CATs in Lancaster Sound has the longest history, with a decade of relevant data. The eastward flow of Arctic water is concentrated on the southern side, where monthly mean current can reach 15 cm/s. Average flow is in the opposite direction on the northern side, but much weaker, about 2 cm/s. Flows are changeable on a wide range of time scales. There appears to be an annual cycle with strongest flow in summer and a secondary peak in February. There is net annual transport of Arctic surface waters towards the Atlantic, with yearly means ranging over 0.4-1.0 Sv and an 8-year average of 0.7 Sv (1 Sv is 1 million cubic metres per second); the fresh-water flux is about 1/15 of the volume flux. Fluctuations in the transport are correlated with fluctuations of the northerly component of wind in the Beaufort Sea.

Results from the array operating in Nares Strait during 2003-06 indicate a 3-year average flow of 0.75 Sv via this route, with a strong seasonal dependence on the state of the ice; flow averaged 0.9 Sv when ice was mobile (typically August through January) and 0.5 Sv when it was fast. The adjacent illustrations of this flow in cross-section depict the array of moorings and show the dramatic difference in structure between drift and fast-ice conditions, and the strong surface intensification in the former circumstance. Because 35% of the volume flux in summer moves in upper 40 m of the ocean, where salinity measurement is difficult, we have no useful estimate of fresh-water flux at this time.