Low frequency variability of the CCS: effect of the 1997-98 El Nino. X. Capet, J McWilliams, A. Shchepetkin (UCLA) Eastern Pacific Ocean Conference 2004.

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Presentation transcript:

Low frequency variability of the CCS: effect of the El Nino. X. Capet, J McWilliams, A. Shchepetkin (UCLA) Eastern Pacific Ocean Conference 2004

Modeling strategy. ½ degree ROMS Pacific between 1970 and NCEP monthly forcings. 15km ROMS USWC between 1990 and Adjusted NCEP monthly forcings. Offline coupling. Boundary conditions updated every 10 days.

Pacific solution TOPEX SSH anomaly 11/97-2/98 ROMS Pacific (0.5 ° grid)

ENSO simulations (0.5 degrees horizontal resolution) Sea Surface Elevation between 1995 and 1999.

Boundary conditions between Sep.97 and Apr. 98 (SST and v anomalies). Sep.Oct.Nov.Dec.Sep.Jan.Feb.Mar.

Wind climatology. NCEP QuikSCAT

Wind climatology. Temperature along CalCOFI line 67 winter spring summer fall

Wind variability : longshore wind stress over the nearshore region exp0 > exp1

Experiment exp0: full variability SSH anomaly exp0 Pt. Conception C. Mendocino

May 97 Sep 97 Oct 97 Nov 97 Dec 97 Jan 98 Feb 98 Mar98 Apr 98 Jun 97 Temperature anomaly exp0

Wind Sensitivity: role of wind anomalies during El Nino Differences are minor everywhere expect north of 40N at the onset and retreat of El Nino conditions. SSH anomaly exp0 SSH anomaly exp1

Temperature anomalies along the USWC Oct 97 Nov 97 Dec 97 Jan 98

Feb 98 Mar98 Apr 98 Jun 97

1- The wind anomaly has a minor influence in the onset and further development of the model ElNino 2- The most noticeable influence of wind anomaly is north of 40 °N. 3- The ocean temperature signal seems to respond to wind changes rather than absolute values. Wind Sensitivity: role of wind anomalies during the El Nino

Origin of temperature anomalies and water displacement associated with the model ElNino signal Nov 97 Dec 97 Spiciness at 50 m depth

Jan 98Feb 98

Spiciness at 70 m depth Jan 98

Lagrangian Trajectories 3D trajectories of floats released at 50m depth 30 km offshore between 30 and 42 degrees in mid october

Lagrangian Trajectories Latitude as a function of time (oct 15 to dec15) for the floats released at 50m depth