National Oceanic and
Atmospheric Administration
United States Department of Commerce


FY 2006

Observations from moorings in the Aleutian Passes: Temperature, salinity and transport

Stabeno, P.J., D.G. Kachel, N.B. Kachel, and M.E. Sullivan

Fish. Oceanogr., 14(Suppl. 1), 39–54, doi: 10.1111/j.1365-2419.2005.00362.x (2005)

Between May 2001 and September 2003, a series of moorings were deployed in four of the Aleutian Passes - Tanaga Pass (12 months of data), Akutan Pass and Seguam Pass (18 months), and Amukta Pass (36 months). Instruments on each mooring measured temperature, salinity and current velocity. Tidal currents dominated the flow in each pass, including a strong fortnightly component in the three deeper passes (Tanaga, Seguam, and Amukta). Net transport in each of the passes was northward, varying from 0.1 × 10⁶ m³ s⁻¹ in Akutan Pass and 0.4 × 10⁶ m³ s⁻¹ in Seguam to >4.0 × 10⁶ m³ s⁻¹ in Amukta Pass. The transport in Amukta Pass, calculated from current meters, was approximately five times as large as previously estimated from hydrographic surveys. At monthly and longer periods, the variability in transport in Amukta Pass was related to the position and strength of the Alaskan Stream southeast of the pass. Vertical mixing was examined in Akutan and Seguam Passes. Strong tidal currents mix the water column top-to-bottom over the shallow sills in the passes, a depth of 80 min Akutan and 140 min Seguam Pass, providing a critical source of nutrients to the Bering Sea ecosystem.

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