As part of the U.S. GLOBEC Northeast Pacific program, repeated Seaglider
surveys will characterize the seasonal and interannual variability of the
Alaska coastal Current (ACC). The dynamics of the Alaska Coastal Current (ACC)
govern stratification and circulation over the inner portion of the Alaskan
shelf, a region that plays a critical role in the early life history of
several commercially important fish species, including juvenile
salmon. The system responds strongly to large seasonal and interannual
changes in freshwater discharge and wind-forcing. Moreover, seasonal shifts
in dynamics likely exert strong influences on the temporal and spatial
structure of stratification, on the spring phytoplankton bloom
and on the advective transport of zooplankton and fish. Seasonal cycles
in dynamics may also play a key role in explaining how nutrients are
replenished in this downwelling-favorable system that is inundated by
nutrient-depleted freshwater discharge. Thus, variability in wind-forcing
and freshwater discharge produce significant changes in ACC dynamics which
can influence the recruitment success of zooplankton and fish through a
number of different pathways.