A composite El Niño

    FORCING:

  1. The 6 El Niños chosen (over Taux at 0°,170°W)
  2. (x,t) Hofmullers of composite Tau and Curl in latitude bands: Southern hemisphere   Northern hemisphere
  3. RMS (maps) of composite forcing:  Taux   Tauy   Curl   -d(Taux)/dy   d(Tauy)/dx   f^s/BCurl(tau)+Taux   
  4. RMS about composite: Taux   Tauy
  5. Time series at 160°E-160°W: Curl   Overlay Tau vectors   Taux   Overlay Tau vectors
       RMS Curl: Plain   Overlay N and S hemisphere   Smooth y=sbx:5
  6. Sequential maps every 3 months: 
    1. The composite:   Yr -1   Yr 0   Yr +1   Combined (html)
        (Different style of wind vectors:   Yr 0   Yr +1)
  7. Compare climatology of stress and curl:  
    1. Mean   Include divergence   Individual derivative terms
    2. Seasonal values (sequential maps):   Totals   (Different style)   Anomalies
    3. Seasonal cycle at 160°E-160°W   
    4. Wind divergence
    5. OND Yr 0 compared to climatology:   Curl   Divergence
  8. Can features be traced to the western boundary?   Combined (WB origins)   (2-month chunks)
  9. Looking at the 6 events individually:
    1. RMS: Taux   Tauy   Correlation: Taux   Tauy
    2. Quantities averaged over 160°E-160°W:
      Actual values: Taux   Tauy   Curl   Differences: Taux   Tauy
      Vectors: Differences from composite   Overlay composite   Overlay curl   
    3. Sequence maps of all 6 events
  10. Variance ellipses, showing the variability among the 6 events and significance of the means.
    Subjectively divided into 6 periods:
    (Mar/Oct yr-1, Nov yr-1/Feb yr0, Mar/Jun yr0, Jul/Oct yr0, Nov yr0/Apr yr+1, May/Aug yr+1)
    1. Individual gifs
    2. Combined jpgs (1-3)   Combined jpgs (4-6)
      Combined pdfs (1-3)   Combined pdfs (4-6)
    3. Plain and bold vectors only: gifs   Stacked: pdf: 1-3   4-6   jpg: 1-3   4-6

    SOLUTION:
  11. The Rossby model forced with the composite El Niño:
    (Forcing was assumed to be zero before and after the 3-year composite.)
    1. Sequential maps of solutions:
      1.    24-month damping, c_k=3.5: Yr -1   Yr 0   Yr +1   Yr +2   Yr +3   Yr _4    Combined
      2.    No damping, c_k=3.5: Yr -1   Yr 0   Yr +1   Yr +2   Yr +3   Yr _4    Combined
      3.    Zonal transports: 24-month damping   No damping
    2. RMS RW solution at 160°E-160°W   Overlay N and S hemisphere   
    3. RW solution along the western boundary: 
      1. c_k=3.5 m/s: D=24   (Yrs -1 to +2)   D=99   (Yrs -1 to +2)   
      2. c_k=2.5 m/s: D=24   (Yrs -1 to +2)   D=99   (Yrs -1 to +2)   
      3. Zonal currents arriving at the WB: c=3.5/D=24   c=3.5/D=99   c=2.5/D=24   c=2.5/D=99   
    4. Hofmullers of forcing and solution at each latitude
    5. (y,t) sections of h_RW and u_RW at various longitudes: 140°W   160°W   180°   Western boundary
    6. Map of Rossby zonal transport during JFM Yr +1
    7. Mean incoming zonal transport at the WB
    8. Later work done in connection with interannual ORCA paper (see its page):
      1. Rossby h and u at the western boundary: h   u
      2. Godfrey WBC from composite El Niño forcing
        1. Southern hemisphere: Years -1 to +2   To year +3   
        2. Northern hemisphere: Years -1 to +3
        3. Total WBC, N and S hemisphere   Exclude 1°S-1°N
        4. Complete WB solution: h, with (U_RW,WBC) vectors
      3. RMS of Rossby solution (compare N and S hemisphere):
        h at 160°E-160°W   WBC transport   V_rw,ek,tot,wbc
      4. Meridional transport (WBC and zonally-integrated interior V):
        1. Line plots: 28.5°S-23.5°S   22.5°S-17.5°S   16.5°S-11.5°S   10.5°S-5.5°S
        2. Shaded fields (y,t): Southern hemisphere   Northern hemisphere
        3. Include V_ekman: Southern hemisphere   Northern hemisphere
        4. Interior V_rw,ekman,total in 20°longitude bands (Open browser wide)
        5. Interior V_rw,ekman,total in longitude bands (Open browser wide)
      5. Winds along the eastern boundary: Taux   Tauy
      6. Rossby wave travel time across the basin
      7. Composite El Niño Rossby quantities on the equator: h   
        WBC transport arriving at the equator: 0.5°S/N   1.5°S/N   Equatorial h due to WBC convergence
      8. A Kelvin wave solution with the composite winds:
        1. h   U
        2. Compare the Rossby solution relative to the western boundary: h   Difference
      9. Movies of the Rossby solution:
        1. h and (u,v) vectors (1.4Mb)   
        2. Vrw,Vek,Vtot (2Mb)   
        3. V shade, (u,v) vectors (2Mb)   
        4. V shade (poleward/Eqward) and (u,v) vectors (2Mb)
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