Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 42, Issue 8, Pages 2910-2917Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL063046
Keywords
juvenile Chinook salmon; coastal upwelling; ecosystem model; California Current; central California; interannual variability
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Funding
- NOAA Fisheries Office of Science and Technology [NA10OAR4320156]
- NOAA Office of Oceanic and Atmospheric Research (Climate Program Office) - Office of Naval Research Marine Mammals and Biology Program [N000141210893]
- NASA Applied Sciences [NNX11AP11G-003]
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A fully coupled ecosystem model is used to identify the effects of environmental conditions and upwelling variability on growth of juvenile Chinook salmon in central California coastal waters. The ecosystem model framework consists of an ocean circulation submodel, a biogeochemical submodel, and an individual-based submodel for salmon. Simulation results indicate that years favorable for juvenile salmon growth off central California are characterized by particularly intense early season upwelling (i.e., March through May), leading to enhanced krill concentrations during summer near the location of ocean entry (i.e., Gulf of the Farallones). Seasonally averaged growth rates in the model are generally consistent with observed values and suggest that juvenile salmon emigrating later in the season (i.e., late May and June) achieve higher weight gains during their first 90days of ocean residency.
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