Ekman and Rossby calculations on the Solomon Sea

Linear explorations with merged CCMP/ASCAT winds (1987-2013)...

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Note: Monthly-mean winds were constructed from original daily files.
CCMP winds were available from July 1987 to June 2011, ASCAT winds from April 2009 to December 2013. For the overlap period, a simple average was made.
"Interannual" means the average annual cycle was removed, and the residual smoothed with a 7-month triangle filter.

  1. Mean solution (from Qiu et al 2010)

  2. Wind mean vectors and variance ellipses in frequency bands
    1. Monthly     (Overlay central section for Ekman transport below)
    2. Annual cycle
    3. Interannual

  3. Winds along sections
    1. Along 154°E
      1. Annual cycle
      2. Interannual     (Glider period)
      3. Long-period
      4. Unfiltered monthly (glider period)
    2. Interannual along 10°S, inside the Solomon Sea
    3. Winds along 10°S basin-wide (RW model forcing):   Taux     Curl

  4. Basin winds
    1. Variance ellipses:  Monthly     Annual cycle     Interannual
    2. Curl RMS:  Monthly    Annual cycle    Interannual
    3. Decadal changes:  1987-2013 mean Curl     Tau difference 99-13 minus 87-96     Curl difference
    4. Low-frequency Curl(x,t) averaged in latitude bins

  5. Ekman transport calculations
    Based on a diagonal section down the center of the Sea
    1. Interannual winds rotated to Along - and Cross-Sea components
      Compare section east of Solomons:  Parallel eastern section     Difference (circumisland wind)
    2. Time series integrated along the section (Sv)     (Glider period)     (Demeaned)
    3. Time series on latitude     (Glider period)
    4. Implied dh/dt at S.I. coast     (Glider period)
    5. Ekman slides sent to Russ (7 Feb 2014) (pdf)

  6. Rossby solution (Early work, Feb 2014. See next section)
    CCMP/ASCAT interannual winds.
    Unless noted: c=3.0m/s, Damping=24 months.
    1. h: thermocline depth anomalies, positive down
      1. Along 165°E     (Glider period)
      2. Along 12°S     (Glider period)
    2. ug on 165°E:  All     Glider period     y=spz3
      Total u_rw arriving at the Solomon Islands
    3. RMS ug at the western boundary input to the NGCU:  Incoming transport RMS(y)     Integral RMS
    4. Rossby/Godfrey solution for Solomon Sea transport (Preliminary)
    5. Solution broken into WBC, direct, Sol.Is.:   Compare glider transport     Compare SOI     (2 choices of dividing latitude)     1987-2013
      Compare 700m obs
    6. Compare SI, Direct, WBC pieces separately (700m):  c=3.0m/s     c=2.5m/s     1987-2013
    7. (Glider transport interannual and SOI)
    8. Annual cycle solution:
      1. Urw:  At 165°E     6°S     (Further S is very weak)
      2. Rossby solution (in parts) and observed Sol.Sea transport

  7. Later Rossby/TDIR work (Nov-Dec 2014)
    Same 1987-2013 CCMP-ASCAT winds. Updated/improved glider transports, further sophistication.
    1. One experiment rotating the winds to along-Sea:  Show region     EOFs of interannual along-Sea winds
    2. Classes of Rossby-TDIR solutions:
      1. WBC/Direct/Sol Is (4-way) split, no circumisland term:
        V2: uses Rossby ug input only for SI:   c=2.5m/s    c=3.0m/s    c=3.2m/s    c=3.5m/s
      2. WBC (Incl 12°S in WBC, no "direct")/Sol Is (3-way) split:
        V3b:   c=2.5m/s    c=3.0m/s    c=3.5m/s (Note circum labels are wrong: no circumisland term here)
      3. WBC (Incl 12°S in WBC, no "direct")/Circum-island corrected/Sol Is (3-way) split:
        V4: Includes both ug,vg Rossby transport inputs:   c=2.5m/s    c=3.0m/s    c=3.5m/s
      4. As V4 but experiment with different coastal averaging for circumisland term (above are 1° from coasts):
        All for c=3.0m/s:  Coastal gridpoint only     2° from coasts (Slight differences)
      5. As V4 but for average annual cycle, c=3.0m/s
    3. Circum-island wind term:  Interannual, both sides     Annual and interannual differences
    4. Rossby-implied WBCs:
      1. Coast of Australia (simple Rossby mass balance with zero BC at 29°S):
        1. WBC interannual anomalies
        2. RMS transport:  Incoming transport     WBC
        3. Correlation of WBC with glider transport
      2. East coast of Solomons (TDIR):
        WBC interannual anomalies
      3. WBC on outer coasts of both Australia and the Solomon Islands (TDIR):
        2007-2013     1990-2013, include Nino3.4