1. Coastal Connectivity in the Southern California Bight Dave Siegel, James Watson, Satoshi Mitarai, (UCSB) Charles Dong & Jim McWilliams (UCLA) Coastal Environmental Quality Initiative 2007-2008

2. Goal of This Study Assess coastal connectivity via advection of water parcels in SoCal Bight Help MPA design (e.g., Chris’s work) Approach: implement offline particle tracking in Charles’ flow simulations

3. Charles’ ROMS Simulations Simulated flow fields (surface vorticity normailized by f) Forced by “realistic” wind Dong and McWilliams (2007) Conil & Hall (2006) Simulated wind field Wind forcing

4. Flow Circulation in SoCal Bight A Big Upllwelling shadow 6 synoptic views of circulation in SBC

5. Offline Particle Tracking Nearshore habitat = 100 m or shallower Lagrangian particles are released & settle within habitats Settlement = particles within nearshore habitat during competency time window Nearshore habitat range 100-m isobath

6. Where do they go? (From North Shore of SBC Islands) Day 0 = 7/1/02Day 0 =1/1/02 Natal areas (self settlement) Nowhere (few settlements) Red dots = settling particles (competency = 20 - 40 d) Single day release in SummerSingle day release in Winter

7. Where do they go? (From Palos Verdes Peninsula) “Everywhere” North of PV / SBC Red dots = settling particles (competency = 20 - 40 d) SummerWinter Day 0 = 7/1/02Day 0 =1/1/02

8. Where do they go? (From San Niclolas Islands) Few settlements Mainland / SBC Islands Red dots = settling particles (competency = 20 - 40 d) SummerWinter Day 0 = 7/1/02Day 0 =1/1/02

9. Where do they come from? (To North Shore of SBC Islands) Mostly from Ventura / LA From “everywhere” Red dots = settling particles (competency = 20 - 40 d) SummerWinter Day 0 = 7/1/02Day 0 =1/1/02

10. Where do they come from? (To Palos Verdes Peninsula) From natal areas South of PV / San Nicholas Red dots = settling particles (competency = 20 - 40 d) SummerWinter Day 0 = 7/1/02Day 0 =1/1/02

11. Where do they come from? (To San Nicholas Islands) PV / natal areas (few) PV / SBC (few) Red dots = settling particles (competency = 20 - 40 d) SummerWinter Day 0 = 7/1/02Day 0 =1/1/02

12. Schematic Diagram

13. Role of Chaotic Eddying Motions (From San Nicholas Island) Day 0 = Jan. 1, 2002Day 0 = Jan. 15, 2002 From “everywhere” Palos Verdes / Natal Red dots = settling particles (competency = 20 - 40 d) SummerWinter

14. Rolf of Vertical Positioning (From Palos Verdes) Day 0 = July 1, 2002Day 0 = Jan. 1, 2002 More spread More clustering Red dots = settling particles (competency = 20 - 40 d) Passive vertical transportDVM (20 m)

15. And more... Inter-annual variability Climate variability (e.g., ENSO) Eileen brought 1997 & 1998 flow simulations

16. Short-term Goal Write up a physical oceanographic two papers describing dispersal patterns in SCB By January James talk more about connectivity