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Studying Mesodinium Rubrum Vertical and Horizontal Distribution Patterns

Conducting experiments and measurements to examine Mesodinium's vertical migration and its effects on water column parameters. The general cruise plan involves time series observations, feature tracking, drifters, algal distribution, and model comparisons. Measurement methods include drifter positioning, CTD readings, water sampling, and algal species analysis. The schedule includes NEAP and SPRING series cruises with specific activities planned for each day. The crew comprises Curtis Roegner as the Chief Scientist, Charles Seaton from OHSU, vessel captain, and deck hand or additional science crew.

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Studying Mesodinium Rubrum Vertical and Horizontal Distribution Patterns

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  1. ForerunnerVertical and horizontal distribution patterns of the bloom-forming ciliate Mesodinium rubrum On behalf of Curtis Roegner

  2. Objectives • Examine Mesodinium vertical migration in relation to horizontal transport 2) Determine effects of ciliate on water column parameters (DO, nutrients) 3) Compare spring and neap tidal conditions

  3. General cruise plan • Experiments include time series + feature tracking measurements • Time series (ciliate vertical distribution with salinity & velocity) • near mouth to evaluate ocean dispersal • Near bridge to evaluate upstream transport • Track bloom patch, measuring xyz position & water column attributes • Model comparison (physical fronts – surface salinity standard products) • Drifters (not in August) • Algal distribution and frontal features

  4. Measurements • Drifter position • CTD (S, T, D, DO, Chl). • Every ½ h. • Water samples (Niskin bottles) • Standard nutrient suite. • Every 1.5 h • Vertical: 1 m , pycnocline, 1m > bottom, Chl max • algal species sample (unfiltered samples) • from Chl max

  5. Schedule(~12h cruises) NEAP SERIES (high-tide to high-tide) • 20 August, anchor station (AS) near Mouth • 21 August, feature tracking • 22 August AS near Bridge SPRING SERIES (low-tide to low-tide) • 27 August, AS near Mouth • 28 August, feature tracking • 39 August AS near Bridge North or South channel, depending on Barnes location, but prefer North channel

  6. Crew • Curtis Roegner, Chief Scientist, NOAA • Charles Seaton, OHSU • Vessel captain • Deck hand or additional science crew ?

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