the influence of diel vertical migration on krill recruitment to monterey bay
DESCRIPTION
The Influence of Diel Vertical Migration on Krill Recruitment to Monterey Bay. Sarah Carr Summer Internship Project Monterey Bay Aquarium Research Institute Mentor: Francisco Chavez and Tim Pennington. Background. Using coupled biological-physical model Physical model: - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: The Influence of Diel Vertical Migration on Krill Recruitment to Monterey Bay](https://reader036.vdocument.in/reader036/viewer/2022062518/56814887550346895db599c6/html5/thumbnails/1.jpg)
The Influence of Diel Vertical Migration on Krill Recruitment to Monterey Bay
Sarah CarrSummer Internship Project
Monterey Bay Aquarium Research InstituteMentor: Francisco Chavez and Tim Pennington
![Page 2: The Influence of Diel Vertical Migration on Krill Recruitment to Monterey Bay](https://reader036.vdocument.in/reader036/viewer/2022062518/56814887550346895db599c6/html5/thumbnails/2.jpg)
Background
• Using coupled biological-physical model• Physical model:
– ROMS circulation model (UCLA) used to generate current velocity fields of Monterey Bay region
• Coupled model:– Krill (E. pacifica) modeled as Lagrangian drifters
with diel vertical migration (DVM)– Idealized scenarios (passive and idealized DVM)
applicable to other organisms
![Page 3: The Influence of Diel Vertical Migration on Krill Recruitment to Monterey Bay](https://reader036.vdocument.in/reader036/viewer/2022062518/56814887550346895db599c6/html5/thumbnails/3.jpg)
ROMS Setup
• Grid:– 1.6 km resolution near Monterey Bay– 5 km resolution regionally– Variable vertical resolution (20 sigma levels)
• Driver: Coamps/Quickscat blended wind product
• Time: October 1999 - September 2000
• “Offline” Model Runs: ROMS velocity fields recorded 2X daily and averaged
![Page 4: The Influence of Diel Vertical Migration on Krill Recruitment to Monterey Bay](https://reader036.vdocument.in/reader036/viewer/2022062518/56814887550346895db599c6/html5/thumbnails/4.jpg)
Grids and Sample Model Output
5 km resolution 1.6 km resolution
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Experimental Design• Behaviors
– Passive– Set DVM
• Swimming speed = 50, 100, 200, 300 m/hr (0.01 - 0.08 m/s)
• Vertical velocity = Model vertical velocity + Swimming speed
– Ontogenetic changes in DVM capacity of E. pacifica
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Experimental Design
• Release locations:– Horizontal
• 10 krill sampling locations in Monterey Bay
– Vertical• Passive- Surface,
50, 100, 200, 300 m
• All DVM- Surface
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Experimental Design• Release times:
– Daily at midnight
– 3 seasons • Upwelling (March- May)
• Oceanic (August-October)
• Davidson (November-January)
• Duration of tracking:– Idealized Behaviors- 20
days
– Krill- ~ 6 mo.
Average alongshore current velocity at the M1 mooring. Figure from Chavez et al. 2002.
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Results: Model Sensitivity
• Starting Location• Starting Time:
– Hour
– Day
– Season
• Starting Depth• Behavior
Note: The following results are for particles started at these locations on six consecutive days in January and July 2000.
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Temperature/Velocity Fields at Start of Simulations
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Sensitivity to Start Time: Season
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Sensitivity to Behavior
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Sensitivity to Initial Depth-
July 2000
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Suggestions?
• Experimental design:– Behavior
– Release locations (H,V)
– Release time
– Duration of tracking
• Visualization– Trajectories (2D, 3D)
– Particle Density