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Jet stream intraseasonal oscillations drive dominant ecosystem variations in Oregon’s summertime coastal upwelling system Public Deposited

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  • Summertime wind stress along the coast of the northwestern United States typically exhibits intraseasonal oscillations (ISOs) with periods from ≈15 to 40 days, as well as fluctuations on the 2- to 6-day “weather-band” and 1-day diurnal time scales. Coastal upwelling of cool, nutrient-rich water is driven by extended periods of equatorward alongshore winds, and we show that the ≈20-day ISOs in alongshore wind stress dominated the upwelling process during summer 2001 off Oregon. These wind stress ISOs resulted from north–south positional ISOs of the atmospheric jet stream (JS). Upper-ocean temperature, phytoplankton, and zooplankton varied principally on the ≈20-day time scale as well, and these correlated with the ISOs in alongshore wind stress and JS position, even though there also were weather-band stress fluctuations of comparable magnitude. Such wind stress ISOs are typical along Oregon in the summer upwelling season, occurring in 10 of 12 years examined, including 2001. We present a previously unreported direct connection from the atmospheric JS to oceanic primary and secondary production on the intraseasonal time scale and show the leading importance of ISOs in driving this coastal upwelling ecosystem during a typical summer.
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  • Bane, J. M., Spitz, Y. H., Letelier, R. M., & Peterson, W. T. (2007, August 14). Jet stream intraseasonal oscillations drive dominant ecosystem variations in Oregon’s summertime coastal upwelling system [Electronic version]. Proceedings of the National Academy of Sciences of the United States of America, 104(33), 13262-13267. doi:10.1073/pnas.0700926104
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  • This work was supported by National Science Foundation Coastal Ocean Processes Program Grants OCE-9907854 and OCE-9907919.
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  • description.provenance : Submitted by Deanne Bruner (deanne.bruner@oregonstate.edu) on 2012-01-09T19:51:26Z No. of bitstreams: 1 SpitzYvette.CEOAS.JetStreamIntraseasonal.pdf: 2078591 bytes, checksum: 32878862a9bcdb89cca21c2a200d80e0 (MD5)
  • Vol. 104 no.33
  • Oregon Explorer
  • description.provenance : Made available in DSpace on 2012-01-09T19:51:26Z (GMT). No. of bitstreams: 1 SpitzYvette.CEOAS.JetStreamIntraseasonal.pdf: 2078591 bytes, checksum: 32878862a9bcdb89cca21c2a200d80e0 (MD5) Previous issue date: 2007-08-14
  • Proceedings of the National Academy of Sciences of the United States of America

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