Diel changes in the distribution of zooplankton over a steep submarine canyon: Is there evidence of canyon-induced transport?

2018 Moors-Murphy 2014 Topographic upwelling and mixing • The geostrophic flow along the isobaths is modified because of bathymetry • The cross-isobaths flow channel deep water into the shelf and resuspends bottom particles • This topographic upwelling enhances local biological productivity. [...] at Hualpen Point ( ) • Towed RDI ADCP (150 kHz) for currents and MVBS • RapidPro CTD • Stratified zooplankton samples in E2 before (day) and after (night) the experiment ET=eastern transectWT=western transect Sobarzo et al. [...] 2016 The Bío-Bío canyon experiment • The experiment was conducted during austral winter (27-28 of July 2023) • Winter has downwellng favorable climatological conditions Winds SST (°C) Sobarzo et al. [...] 2007 Wind conditions The 10 day window prior to the experiment was dominated by strong upwelling-favorable southern winds m s-1 Upwelling favorable events Study period m s-1 m s-1 Hydrographic conditions • Permanent 3-layer estructure • Deep layer → ESSW → active upwelling • Shallow hypoxia • Diurnal signal in chl-a in surface layer E EW E W W E W W E E W E W Currents Eastern transect Mean velocit. [...] macarenapaz.da@gmail.com Slide 1: Diel changes in the distribution of zooplankton over a steep submarine canyon: Is there evidence of canyon-induced transport? Slide 2 Slide 3: Topographic upwelling and mixing Slide 4 Slide 5 Slide 6 Slide 7 Slide 8 Slide 9: Mean velocities Slide 10: Mean velocities Slide 11 Slide 12 Slide 13 Slide 14 Slide 15 Slide 16 Slide 17.