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Large-scale indices (PDO and NPGO) displayed values considered more favorable for productivity (more negative PDO and more positive NPGO; Chenillat et al., 2012; Sydeman et al., 2014) in the California Current system during 2007-2008 than during 2005-2006, reflected in the highest rockfish density occurring during 2007 and 2008 (Suppl.
Correlation coefficients between salinity at the surface and at 30-m depth were positively and significantly correlated (coefficient of correlation [r]=0.58, P=0.011) and negatively correlated between temperature at 30 m and the NPGO (r=-0.66, P=0.003).
This newly described diversity was then related to environmental factors, such as ocean temperature, upwelling intensity, and productivity regime (PDO and NPGO indices), and season to explore temporal and spatial drivers of species diversity or mating success (Taylor et al., 2004; Thompson et al., 2016; Thompson et al., 2017).
Measures of oceanographic conditions off Oregon and Washington during 2005-2008: sea-surface temperature (SST), sea-surface salinity (SSS), temperature and salinity at the depth of 30 m, monthly Upwelling Index, monthly Pacific Decadal Oscillation (PDO) index, and monthly North Pacific Gyre Oscillation (NPGO) index.
Environmental data include sea surface temperature (SST) and salinity at the sea surface (1 m; SSS) and at a depth of 30 m, Upwelling Index (UI), Pacific Decadal Oscillation (PDO) index, and North Pacific Gyre Oscillation (NPGO) index.
Environmental data include sea surface temperature (SST) and salinity (SSS) at 1 m, and at a depth of 30 m, Upwelling Index (UI), Pacific Decadal Oscillation (PDO) index, and North Pacific Gyre Oscillation (NPGO) index.
The IC3 loading map pattern (Figure 12) is quite similar to EOF5 (Central Pacific (CP) El Nino), combined with the NPGO (colder North Pacific for positive IC3).
Negative extremes of IC5 (e.g., 1947, 1992/93) are also associated with a strong negative AMO and NPGO. The NE of IC5 result essentially from the highly positive kurtosis and long pdf tails of PC10 and PC2 (Table 2).
A possible explanation is that PC4 (simulating NPGO) influence both IC1 and IC5.
The most prominent or most negentropic IC (or IC1) represents El Nino conditions combined with negative PDO, positive NPGO, and composite impacts of El Nino (asymmetric with respect to La Nina) on oceanic mid-latitudes, poleward of 30[degrees].
Indices tested include North Pacific Gyre Oscillation (NPGO), Coastal Upwelling Index (CUI), Pacific Decadal Oscillation (PDO), Multivariate ENSO Index (MEI), and bottom sea temperature (BST).
For the former (haul), we used both local (in situ temperature and salinity measured at depths of 1 and 7 m, and tidal stage and height) and regional (river flow and temperature, SST, SLH, UI, PDO, and NPGO) environmental parameters, whereas for the latter (cruise) we used only regional environmental parameters.
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