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| Chenillat, Fanny; Riviere, Pascal; Capet, Xavier; Di Lorenzo, E.; Blanke, Bruno. |
| On interannual and longer time scales, dynamical and biogeochemical fluctuations in the North Pacific are dominated by two modes of variability, namely the Pacific Decadal Oscillation and the North Pacific Gyre Oscillation (NPGO). In this study the regional expression of the NPGO in the California Current System (CCS) is detailed. The statistical relationship between the NPGO index and nearshore wind variability (mostly upwelling favorable) along the U. S. West coast is strongest in the wintertime (December to March) off Central California. Most importantly, NPGO fluctuations are associated with a seasonal shift of 1-2 months in the onset of the upwelling season. Regional numerical simulations show that an early (late) onset of upwelling during the... |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00063/17396/15062.pdf |
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| Di Lorenzo, E.; Schneider, N.; Cobb, K. M.; Franks, P. J. S.; Chhak, K.; Miller, A. J.; Mcwilliams, J. C.; Bograd, S. J.; Arango, H.; Curchitser, E.; Powell, T. M.; Riviere, Pascal. |
| Decadal fluctuations in salinity, nutrients, chlorophyll, a variety of zooplankton taxa, and fish stocks in the Northeast Pacific are often poorly correlated with the most widely-used index of large- scale climate variability in the region - the Pacific Decadal Oscillation (PDO). We define a new pattern of climate change, the North Pacific Gyre Oscillation (NPGO) and show that its variability is significantly correlated with previously unexplained fluctuations of salinity, nutrients and chlorophyll. Fluctuations in the NPGO are driven by regional and basin-scale variations in wind-driven upwelling and horizontal advection - the fundamental processes controlling salinity and nutrient concentrations. Nutrient fluctuations drive concomitant changes in... |
| Tipo: Text |
Palavras-chave: North Pacific Ocean climate; Salinity and nutrient variability; Upwelling and ecosystems. |
| Ano: 2008 |
URL: https://archimer.ifremer.fr/doc/00483/59492/62351.pdf |
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