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Colaborators: A. Amador, E. Beier (CICESE), R. Castro (UABC)

Surface drifters in the southern Gulf of California (June 2004-2006) Miguel F. Lavín 1 and P. P. Niiler 2 1) CICESE, Ensenada, Mexico 2) SIO, La Jolla, USA. Colaborators: A. Amador, E. Beier (CICESE), R. Castro (UABC). Southern G.C. Surface Circulation.

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Colaborators: A. Amador, E. Beier (CICESE), R. Castro (UABC)

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  1. Surface drifters in the southern Gulf of California (June 2004-2006)Miguel F. Lavín1 and P. P. Niiler21) CICESE, Ensenada, Mexico2) SIO, La Jolla, USA Colaborators: A. Amador, E. Beier (CICESE), R. Castro (UABC)

  2. Southern G.C. Surface Circulation • Seasonal (Pacific, wind, buoyancy, mixing) • Eddies (geostrophic, topographic?) • Coastal Trapped Waves (Ecuatorial, Storm-generated) • Jets (costal, eddy-edge, frontal instabilities) • Short-period events (met-driven)

  3. HOW WE KNOW ABOUT IT? Mostly from hydrography and heat and salt balances. Geostrophy from single-section “constructed” seasonal cycles. Numerical models (3D baroclinic). Mesoscale from satellite images (SST and color). Almost no instrumented current observations! Except: Moorings by Winant & Merrifield in Guaymas basin, acoustic dropsondes by Collins et al., in the mouth.

  4. AVHRR SeaWiFS MESOSCALE 50 cm/s? /Eddies Navarro et al. (2004)

  5. TRAPPED WAVES NLOM (Zamudio et al., 2002)

  6. MODE 1 Vg Heat flux MEAN Vg 2005

  7. (2003) MODE Top 10 m 3D HAMSON baroclinic model

  8. What numerical models use to show they work: Anticyclonic in Winter Cyclonic in Summer (Lavín et al., 1997)

  9. 120+ DRIFTERS WERE LAUNCHED SeMar February & July 2005 (4 each) CICIMAR August 2005, June 2006 (4 each) Ferrys, once a month, June 2004-June 2005 NAME 5-21 June 2004 (16 drifters) 6-21 Aug. 2004 (16 drifters) 1 drifter once a month, June 2004-July 2005 PROCOMEX (4 each) June 2005 November 2005 August 2006

  10. Jun 2004-Oct 2006

  11. All June 2004

  12. Vg 1500 m Q2 Junio 2004 AVHRR 1.1x1.1 km June 15-30, 2004 MODIS 4km x 4km

  13. JUNE 2004 JUNE 2005

  14. JUNE 2004 JUNE 2006 JUNE 2006 JUNE 2004 (no scale, raw, not cleaned)

  15. July 2004 July 2005 Cyclonic Anticyclonic Cyclonic Cyclonic

  16. AUGUST 2004 AUGUST 2005 Cyclonic Cyclonic Cyclonic Cyclonic Cyclonic Cyclonic Anticyclonic

  17. Origin of the coastal current? • Costa Rica Coastal Current/WMC • Wind change

  18. Wyrtki 1965 May 2002 May 2001 Giro anticiclónico June 2003 June 2005 CC?

  19. (2002)

  20. SUMMARY 1.- In June-July there is a poleward current along the Mexican mainland with speeds up to ~80 cm/s. 2.- In average, its speed is ~60 cm/s: it takes 3 weeks for drifters to travel from the inner entrance to the northern Gulf. 3.- This speed is twice the speed of advance of climatological AVHRR isotherms (~30 cm/s). 4.- The drifters suggest that the current lasts 2-3 weeks. 5.- The circulation pattern changes by August: gulf-wide eddies dominate the circulation. July: Guaymas basin, Anticyclonic eddy, s~50 cm/s, period ~5 days. August: SPMtr & Guaymas basin, Cyclonic eddy, : s~25 cm/s, period ~3 days July-October: LaPaz-Topo, Cyclonic eddy : s~30 cm/s, period ~3-4 days

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