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analysis seca2

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Analysis-Secalis-2 data - A. Ganachaud

Inverse model Secalis 2

Cruise map

Cruise map with CARS velocity streamlines on sigma=25

CTD Geostrophy and SADCP

ROMS results (L. Gourdeau, Noumea)

A-EKMAN TRANSPORT

  1. Quickscat (http://apdrc.soest.hawaii.edu/datadoc/qscat_mon.htm) december 2004 average
  2. Section integral in Sv, POSITIVE TO THE RIGHT South section: -0.08 Sv; South-retour: -0.17; Havannah-Santo: -0.73; Huon-Santo: +0.32

B-FRESHWATER BUDGET

  1. Precipitation (Xie-Arkin, http://www.cdc.noaa.gov/cdc/data.cmap.html): DECEMBER 2004: 0.01 Sv (6mm/day average over area of 1.46e11m2

C1-INVERSE MODEL SECALIS-2 UPPER BOX: without pair 26-27

  1. Thermocline waters: surface to 25.5 (See Johnson 2005) but at Huon 26 gets the high salinity tongue

  2. Model 5

    1. Layers: Huon-Vanuatu, Havannah-Vanuatu

    2. Mass, heat and salt conservation

      1. resolution and observation matrices (resolution matrix: b estimated = (RES) * btrue)
      2. Ekman transports correction:

        1. Grand Passage: 124% init: 1e-06 final:  0.012+/-0.18 Corr: 0.012

        2. Huon-Santo: -4% init:  0.32 final:   0.3+/- 0.5 Corr:-0.016

        3. Havannah-Santo:-2% init:  0.73 final:  0.71+/- 0.5 Corr:-0.016

      3. Solution:

        1. Equation residuals
        2. non dimensional

        3. Reference level (wstar in 10e-5cm/s)

      4. Net transports and residuals

C2-INVERSE MODEL SECALIS-2 UPPER BOX-With pair 26-27 and no 700m wedge mask

  1. Thermocline waters: surface to 25.5 (See Johnson 2005) but at Huon 26 gets the high salinity tongue

  2. Model 1: high vertical resolution, mass conservation only
  3. Model 2-3-4: lower vertical resolution, mass, heat and salt

  4. Model 4

    1. Layers: Huon-Vanuatu, Havannah-Vanuatu

    2. Mass, heat and salt conservation

      1. resolution and observation matrices (resolution matrix: b estimated = (RES) * btrue)
      2. Ekman transports correction:

        1. Grand Passage: 103% init: 1e-06 final:  0.01+/-0.18 Corr: 0.01

        2. Huon-Santo: -6% init:  0.32 final:   0.3+/- 0.5 Corr:-0.023

        3. Havannah-Santo:-3% init:  0.73 final:  0.71+/- 0.5 Corr:-0.022

      3. Solution:

        1. Equation residuals
        2. non dimensional

        3. Reference level (wstar in 10e-5cm/s)

        4. Grand Passage

        5. Huon-Santo (ferret version)
        6. Havannah-Santo (positive to East or south; ferret version)

      4. Net transports and residuals

      5. Cumulative transports from south or west (negative sign on Havannah-Huon so that near Havannah transport is negative southward)

      6. Cumulative horizontal transports by layers

        1. Grand Passage: -0.3+/- 2 total

        2. Huon-Santo

        3. Havannah-Santo
  5. Comparison ROMS and Secalis-2 inverse model

    1. secalis and roms velocities: Huon-Santo; Havannah-Santo
    2. cumulative transports (ROMS=absolute perpendicular): Huon-Santo; Havannah-Santo

C3-INVERSE MODEL SECALIS-2 UPPER BOX-With pair 26-27 and 700m wedge mask; 590m wedge mask on stations 15-16

  1. Model 6

    1. Layers: Huon-Vanuatu, Havannah-Vanuatu

    2. Mass, heat and salt conservation

      1. resolution and observation matrices (resolution matrix: b estimated = (RES) * btrue)
      2. Ekman transports correction:

        1. Grand Passage: 116% init: 1e-06 final: 0.012+/-0.18 Corr:0.012

        2. Huon-Santo: -6% init:  0.32 final:   0.3+/- 0.5 Corr:-0.02

        3. Havannah-Santo: -2% init:  0.73 final:  0.71+/- 0.5 Corr:-0.02

      3. Solution:

        1. Equation residuals
        2. non dimensional

        3. Reference level (wstar in 10e-5cm/s)

        4. Grand Passage

        5. Huon-Santo
        6. Havannah-Santo

      4. Net transports and residuals

      5. Cumulative transports from south or west (negative sign on Havannah-Huon so that near Havannah transport is negative southward)

      6. Cumulative horizontal transports by layers

        1. Grand Passage: 0.35+/- 2 total

        2. Huon-Santo

        3. Havannah-Santo

 

C4-INVERSE MODEL SECALIS-2 UPPER BOX-With no station 26 and no 700m wedge mask; no 590m wedge mask on stations 15/16

  1. Model 7: reference run for paper August 2007

    1. Layers: Huon-Vanuatu, Havannah-Vanuatu

    2. Mass, heat and salt conservation

      1. resolution and observation matrices (resolution matrix: b estimated = (RES) * btrue)
      2. Ekman transports correction:

        1. Grand Passage: -100% init: 1e-06 final: -0.01+/-0.18 Corr:-0.01

        2. Huon-Santo: -7% init:  0.32 final:   0.3+/- 0.5 Corr:-0.024

        3. Havannah-Santo: -3% init:  0.73 final:  0.71+/- 0.5 Corr:-0.024

      3. Solution:

        1. Equation residuals
        2. non dimensional

        3. Reference  velocities (wstar in 10e-5cm/s)

        4. Grand Passage

        5. Huon-Santo
        6. Havannah-Santo

      4. Net transports and residuals

      5. Cumulative transports from south or west (negative sign on Havannah-Huon so that near Havannah transport is negative southward)

      6. Cumulative horizontal transports by layers

        1. Grand Passage: 0.16+/- 1.8 total including Ekman

        2. Huon-Santo

        3. Havannah-Santo
  2. Model 9: test with GP at 5Sv spread over first 3 layers

    1. Layers: Huon-Vanuatu, Havannah-Vanuatu

    2. Mass, heat and salt conservation

      1. resolution and observation matrices (resolution matrix: b estimated = (RES) * btrue)
      2. Ekman transports correction:

        1. Grand Passage: -48% init:    -5 final:  -2.6+/- 2.3 Corr:  2.4

        2. Huon-Santo: -12% init:  0.32 final:  0.28+/- 0.5 Corr:-0.041

        3. Havannah-Santo: -5% init:  0.73 final:  0.69+/- 0.5 Corr:-0.04

      3. Solution:

        1. Equation residuals
        2. non dimensional

        3. Reference  velocities (wstar in 10e-5cm/s)

        4. Grand Passage

        5. Huon-Santo
        6. Havannah-Santo

      4. Net transports and residuals

      5. Cumulative transports from south or west (negative sign on Havannah-Huon so that near Havannah transport is negative southward)

      6. Cumulative horizontal transports by layers

        1. Grand Passage: -1+/- 2 total including Ekman

        2. Huon-Santo

        3. Havannah-Santo

D-INVERSE MODEL SECALIS-2 LOWER BOX

South part is a meridional section (South down to 1000db) and the return trip, down to 2000 db, but with only two stations.

  1. Model 1:

    1. Layers:  MeridionalSouth Return (1 pair):  0  94.76  292.44  697.28  966.28 m

    2. Mass conservation in all layers

      1. resolution and observation matrices (resolution matrix: b estimated = (RES) * btrue)
      2. Ekman transports correction:

        1. Seca2LegSouth:  34% init:  0.08 final:  0.11+/- 0.5 Corr:0.031

        2. Seca2LegSouthR:  19% init: -0.17 final:  -0.2+/- 0.5 Corr:-0.031

      3. Solution:

        1. Equation residuals
        2. non dimensional

        3. Reference level (wstar in 10e-5cm/s)

        4. Meridional South (ferret version)

        5. Return
        6. Net transports and residuals

        7. Cumulative transports from south, positive westwards

      4. Cumulative horizontal transports by layers

        1. Meridional-South

        2. 4.6 +/- 2.4 Sv eastwards
      5. Velocities

        1. Meridional South, Return
  2. Comparison ROMS and Secalis-2 inverse model

    1. secalis and ROMS velocities
    2. cumulative transports

Global comparative ROMS-SECALIS cumulative transports

For section Huon Santo
For section Havannah-Santo
For section South


Related CARS plots

  1. salinity along 166e 167e
  2. geostrophic flow on S=26 from B. Kessler

  3. transports between NC and Santo (Figures from B. Kessler): through 167E and through a diagonal section.

  4. AAIW page

OCCAM model plots

  1. flow lines, december 2004, at 200m and 900m
  2. Integrated flow lines, december 2004, 0-265m; 265-2000m

  3. Integrated flow lines, yearly mean 2004, 0-265m; 265-2000m

  4. flow lines, december 1994, at 200m and 900m
  5. Integrated flow lines, december 1994, 0-265m; 265-2000m

  6. Integrated flow lines, yearly mean 1994, 0-265m; 265-2000m

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