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analyse_secalis2_ctd

by Webmaster Legos last modified Jun 28, 2012 03:07 PM

CTD-Geostrophy and SADCP Secalis-2

A. Ganachaud

Cruise map

CTD-Geostrophy

1. Default treatment:

  • data were filtered with a 7-points (7-meters) median to remove most spikes before integration in 20m bins and insure static stability

  • missing data in the first 60db are copied all the way up

  • missing data in the last 10db are copied all the way down

  • holes or larger extrapolations are done visually (horiz/vertical interpolation)

 

      2.South Leg

    1. T/S diagrams

    2. Theta, S, sigma, Vgeo_1000m;

    3. Zoom 0-1000m: Theta, S, sigma, vgeo_1000m, (Ferret version)

    4. transports by depth range cumulative from north (NC reef)

 

      3. South Leg Return trip (Two stations at 2000db)

    1. T/S diagrams

    2. 0-2000m: Theta, S, sigma, vgeo_2000m

    3. see also CARS from Billy (http://www.pmel.noaa.gov/people/kessler/noumea/cars/surface-dh-ug-nc-detail.gif)

 

      4. East Leg Havannah-Vanuatu: (without station 26)

    1. T/S diagrams

    2. Theta, S, sigma, Vgeo_2000m

    3. zoom 0-1000m: Theta, S, sigma, vgeo_2000m (positive to East); without station 26

    4. transports (!positive to the east but positive to the south towards New Caledonia) by depth range cumulative from north (Vanuatu)

    5. Topography Stations 26 (-16.1, 166.8) or  (-16°06, 166°48) to 27 (-15.75, 166.683) or (-15°45, 166°41) from along track (separation is 40km)
    6. Geostrophic velocity Stats 26-27

    7. Geostrophic velocity field, with sill depth at 700m for sts 26-27

 

      5. North Leg Huon-Vanuatu:

    1. T/S diagrams

    2. Theta, S, sigma, Vgeo_2000m

    3. Zoom 0-1000m: Theta, S, sigma, vgeo_2000m (ferret version) (positive to North; Station Huon stops at about 350m; had bottom depth set at this level rather than the true one (670m) to avoid spurious geostrophic velocity calculations)

    4. detail NCJ , transports by depth range cumulative from east (Vanuatu)

    5. Comparison of vgeo2000 with the P21data

 

    6. Grand Passage (North NC) :

    1. T/S diagrams

    2. Theta, S, sigma, vgeo_520m (positive to East)

    3. transports by depth range

Nice Ferret plots

  1. North Box Theta and S (Four quadrans); South Theta and S
  2. North and South TS diagram (Blue=Huon-Vanuatu; Red=Vanuatu-Havannah;Green=South). The lower salinity maximum corresponds to two stations near Huon. Detail Grand Passage.

  3. TS diagram with ROMS
    1. Comparison with P21 between NC and Vanuatu

 

Comparison with CARS (Dec climatology)

SADCP

    • Note that ADCP data started only at -18.8 while first station at -18.6 because ADCP was not on between 18.6 and 18.8.Lots of shear in both: eastward flow in SADCP near the surface, near zero at 100-200m. Gvel shows close to zero at 200m and bulk flow occuring at 300m. Compare Geost and ADCP 150-206m: geostrophy: +2.5cm/s; SADCP:+6.5cm/s assign +/10cm/s.
ADCP time windows:
    • section 1: transboulari     2004/12/08 05:00:40 (342.2088) to 2004/12/09 11:54:49 (343.4964)
      section 2: transboulari_ret    2004/12/09 10:19:48 (343.4304) to 2004/12/09 19:39:48 (343.8193)
      section 3: transmato        2004/12/09 17:49:48 (343.7429) to 2004/12/10 06:34:50 (344.2742)
      section 4: zonalmato        2004/12/10  9:29:48 (344.3957) to 2004/12/10 19:54:50 (344.8297)
      section 5: longdurecif        2004/12/11 00:22:51 (344.0159) to 2004/12/11 01:57:51 (345.0818)
      section 5: transSud        2004/12/11 11:31:21 (345.4801) to 2004/12/12 19:56:22 (346.8308)
      section 6: transSud_ret        2004/12/12 21:51:23 (346.9107) to 2004/12/13 18:26:23 (347.7683)

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