low frequency variability of the ccs: effect of the 1997-98 el nino. x. capet, j mcwilliams, a....
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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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Modeling strategy.
½ degree ROMS Pacific between 1970 and 1999. NCEP monthly forcings.
15km ROMS USWC between 1990 and 1999. Adjusted NCEP monthly forcings.
Offline coupling. Boundary
conditions updated every 10 days.
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Pacific solution
TOPEX SSH anomaly 11/97-2/98 ROMS Pacific (0.5° grid)
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ENSO simulations (0.5 degrees horizontal resolution)
Sea Surface Elevation between 1995 and 1999.
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Boundary conditions between Sep.97 and Apr. 98 (SST and v anomalies).
Sep. Oct. Nov. Dec.Sep. Jan. Feb. Mar.
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Wind climatology.
NCEPQuikSCAT
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Wind climatology. Temperature along CalCOFI line 67
winter spring summer fall
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Wind variability : longshore wind stress over the nearshore region
exp0>exp1
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Experiment exp0: full variability
SSH anomaly exp0
Pt. Conception
C. Mendocino
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May 97
Sep 97
Oct 97
Nov 97
Dec 97
Jan 98
Feb 98
Mar98
Apr 98
Jun 97
Temperature anomaly exp0
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Wind Sensitivity: role of wind anomalies during El Nino 97-98.
Differences are minor everywhere expect
north of 40N at the onset and retreat of El
Nino conditions.
SSH anomaly exp0 SSH anomaly exp1
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Temperature anomalies along the USWCOct 97
Nov 97
Dec 97
Jan 98
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Feb 98
Mar98
Apr 98
Jun 97
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1- The wind anomaly has a minor influence in the onset and further development of the model 97-98 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 97-98 El Nino
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Origin of temperature anomalies and water displacement associated with the model 97-98 ElNino signal
Nov 97 Dec 97
Spiciness at 50 m depth
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Jan 98 Feb 98
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Spiciness at 70 m depth Jan 98
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Lagrangian Trajectories
3D trajectories of floats released at 50m depth 30 km offshore between 30 and 42 degrees in mid october 1997
1996
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Lagrangian Trajectories
Latitude as a function of time (oct 15 to dec15) for the floats released at 50m depth