Surface drifters in the southern Gulf of. California. (June )

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Presentation transcript:

Surface drifters in the southern Gulf of. California. (June 2004-2006) Surface drifters in the southern Gulf of California (June 2004-2006) Miguel F. Lavín1 and P. P. Niiler2 1) CICESE, Ensenada, Mexico 2) SIO, La Jolla, USA Colaborators: A. Amador, E. Beier (CICESE), R. Castro (UABC)

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)

Mostly from hydrography and heat and salt balances. 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.

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

TRAPPED WAVES NLOM (Zamudio et al., 2002)

MODE 1 Vg Heat flux MEAN Vg 2005

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

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

5-21 June 2004 (16 drifters) 6-21 Aug. 2004 (16 drifters) 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

Jun 2004-Oct 2006

All June 2004

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

JUNE 2004 JUNE 2005

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

July 2004 July 2005 Cyclonic Anticyclonic Cyclonic Cyclonic

AUGUST 2004 AUGUST 2005 Cyclonic Cyclonic Cyclonic Cyclonic Cyclonic Cyclonic Anticyclonic

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

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

(2002)

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