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The Influence of Diel Vertical Migration on Krill Recruitment to Monterey Bay Sarah Carr Summer Internship Project Monterey Bay Aquarium Research Institute.

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Presentation on theme: "The Influence of Diel Vertical Migration on Krill Recruitment to Monterey Bay Sarah Carr Summer Internship Project Monterey Bay Aquarium Research Institute."— Presentation transcript:

1 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

2 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

3 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

4 Grids and Sample Model Output 5 km resolution1.6 km resolution

5 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

6 Experimental Design Release locations: –Horizontal 10 krill sampling locations in Monterey Bay –Vertical Passive- Surface, 50, 100, 200, 300 m All DVM- Surface

7 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.

8 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.

9 Temperature/Velocity Fields at Start of Simulations

10 Sensitivity to Start Time: Season

11 Sensitivity to Behavior

12 Sensitivity to Initial Depth- July 2000

13 Suggestions? Experimental design: –Behavior –Release locations (H,V) –Release time –Duration of tracking Visualization –Trajectories (2D, 3D) –Particle Density

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