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Barneo 2008 - MSS. Lomonosov Ridge profiles. First, some basic plots:. Mean profiles. Hmm, salinity stratified mixed layer… Seems like the mean profile does not give a good picture of the mixed layer properties, especially regarding salinity. TS diagram. TS contourplot.

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barneo 2008 mss
Barneo 2008 - MSS

Lomonosov Ridge profiles

First, some basic plots:

slide2

Mean profiles.

Hmm, salinity stratified mixed layer… Seems like the mean profile does not give a good picture of the mixed layer properties, especially regarding salinity

slide7

Density and dissipation, upper 100m

Update: Discovered that

slide8

Heat fluxes:

  • Modifying Make_HeatFlux_Cox_4m_2008rev.m to be similar to the 2007 version.
  • Updating the cast list to exclude yo-yo profiles. Also, cast 98 and 213 failed due to bad spectre, so I excluded those as well. Fix later.

Mean stratification, 4 m averages, shows that Krho estimates should be ok above ~260 m.

Threshold for “low stratification”, 1.7·10-3 s-1 (Fer, 2009), or 1 cycle/hour

slide9

Profiles heat flux, all profiles. Cast 4 showed very large negative fluxes around 270m and is not included.

  • There is a lack of values in the upper mixed layer, check out why…
  • Seems like a threshold for absolute value of the temp gradient (larger than 1·10-3) excludes a lot of segments in the upper mixed layer.

Should be ok down to here

Right below temp maxima

slide10

Looking at the KT based heat flux:

Blue line is mean FHCox, except yoyo and cast 4 and 213.

Dashed lines indicate the 95 % confidence interval

Need to look closer at the different layers…

slide11

Depth of mixed layer and pycnocline

Dml is found using the Thomson and Fine routine, Dpyc is found as depth of maximum N2

Mean Dml = 30 m

Mean Dpyc = 84 m

Sometimes N2 has a secondary maximum in the pycnocline which is slightly larger than the first…

slide12

Upper levels of thermocline and halocline, used later to find heat fluxes across the cold halocline layer.

slide13

Heat fluxes in mixed layer and upper pycnocline

Mean values and 95% confidence intervals:

Fh,ml = 0.03 [-0.15 0.21] Wm-2

Fh,pyc = -0.01 [-0.04 0.02] Wm-2

Fhchl = -0.03 [-0.05 -0.01] Wm-2

No significant heat fluxes…

slide14

Looking at double diffusive staircases and resulting heat flux

Rewriting Ilker’s routine and use a method based on Padman and Dillon (1987), where all the thermohaline staircases are detected from a given treshold and fluxes determined

To the right are the average result for all profiles (except yo-yos and Lomonosov) where thermohaline staircases are determined in the range 200 – 450 m and averaged in 10 m bins.

Seems like most important depths are 200 - 260 and 290 – 310m. Average fluxes reaching 2 Wm-2 at 225 m.

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