Pacific Science
Groundfish Section |
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View a downloadable text file
containing the annual values for this index.
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Fisheries
Climatology:
Climate-Ocean Regime IndicesAleutian
Low Pressure Index (ALPI)
This index measures the relative intensity of the
Aleutian Low pressure system of the north Pacific (December through March). It is
calculated as the mean area (km2) with sea level pressure <= 100.5 kPa and
expressed as an anomaly from the 1950-1997 mean. A positive index value reflects a
relatively strong, or intense Aleutian Low.
Correct citation:
Beamish, R.J., C.E. Neville and A.J. Cass. 1997. Production of
Fraser River sockeye salmon (Oncorhynchus nerka) in relation to decadal-scale
changes in the climate and the ocean. Can. J. Fish. Aquat. Sci. 54: 543-554.
(Abstract)
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