fast salinity drift

[BSHbirgit]

Dear all

I have started a report on all my files which I would like to share with you. It contains all the floats in my dmqc-responsibility which shown this failure mode and it would be great if we could make it a more complete list for europe. I added a few of you to the assignees list, I probably forget people. Please share

Liste_mit_fastsaltydrift.pdf

[gnotarstefano]

Dear Birgit,
I have prepared a document based on your format for the floats in the Med and Black Seas. Please, consider that this is a partial analysis.
Giulio
large_salty_drift_Med_BS.docx

[cabanesc]

Dear Birgit,
Here is a report for the fast salty drifts found for floats DMQCed by LOPS in the North Atlantic.
Cecile

salty_drift_report_lops.pdf

[BSHbirgit]

Hi Cecile Thanks for the report. I only had a quick look at it. But I will try to check more carefully tomorrow and then start the short presentation for the AST meeting, so I can send it around and ask for the comments of the working group. Smart idea by the way to plot shallow and deep corrections in one plot. I hope you are doing fine with your work from home office.

[BSHbirgit]

Hi Guilio Thanks for sharing your report on the fast salty drifters. I only had a quick look at it and will look more closely tomorrow. It seems you also have some really ugly fresh drifters/Jumpers and some strange non-linear behaviour. Greetings, Birgit Klein

[kamwal]

Hi Birgit,

I am sending you the list and reports of floats affected by salty drift. These floats are from the Southern Ocean, the South Atlantic and the North Atlantic.

All the best,
Kamila

Salty_drifts_BODC.docx

3901879_DMQCreport_20190113.pdf
3901887_DMQCreport_20200113.pdf
3901888_DMQCreport_20200113.pdf
3901889_DMQCreport_20200113.pdf
3901893_report_20200129.pdf
3901912_report_20200122.pdf
3901913_report_20200122.pdf
3901915_report_20200122.pdf
3901948_DMQCreport_20200113.pdf
3901949_DMQCreport_20200113.pdf
6901121_DMQCreport_20190912.pdf
6901174_DMQCreport_20190423_v2.pdf
6901192_DMQCreport_20190930.pdf
6901924_DMQCreport_20191010.pdf
3901880_DMQCreport_20190113.pdf
3901882_DMQCreport_20200113.pdf
3901883_DMQCreport_20200113.pdf
3901886_DMQCreport_20200113.pdf

[BSHbirgit]

Hi @kamwal Thanks for your report. Greetings, Birgit

[coatanoan]

Dear Birgit,
Please find a document based on your format for the floats on which DMQC is done at Coriolis. As Giulio, consider that this is a partial analysis.
Best,
Christine
salty_drift_floats_Coriolis.xlsx

bilan_6900701.pdf
bilan_6901713.pdf
bilan_6901731.pdf
bilan_6901738.pdf
bilan_6901611.pdf
bilan_6901735.pdf
bilan_6901736.pdf
bilan_6902726.pdf
bilan_6902762.pdf
bilan_5903133.pdf
bilan_6901017.pdf
bilan_6901503.pdf

[BSHbirgit]

thanks Christine

keep us posted when more information becomes available. I think we are doing fine here in Europe and with the shared information we will be able to get a getter view of the various behavior.

[BSHbirgit]

Dear all,
at the last ERIC management board meeting we had discussed the issue of 'fast salty drift' and I promised to look through the reports to check how many profiles we have lost through the failure. I will work on a joint report for all the European floats affected so far and will post it here as soon as I am finished.

Cheers, Birgit

[BSHbirgit]

dear all

I have update the existing word document and incorporated all european contributions. I have also counted the cycles we have lost by not being able to correct and those we had to correct early.

In preparation for ADMT it would be good to update the list when you have performed new dmqc. I also looked at the reports you had uploaded here with the output from your dmqc analysis, the actions taken and corrections apllied. Sometimes the reports seem to have cut-and-paste text or reflected other outcomes than in the submitted data. The same was definetly true for my reports, but I could already correct that in the word document. Where I added text for your floats or had questions, I have marked them in red.
List_fastsaltydrift_europe.docx

[kamwal]

Hi Birgit,

Thank you for looking on these floats and for all comments you added to the list.
I went through the floats that you have highlighted and did the second round of DMQC analysis for most of them

Salty_drifts_BODC_2.docx

6901192_DMQCreport_20200925.pdf
3901886_DMQCreport_20200921.pdf
3901887_DMQCreport_20200113.pdf
3901888_DMQCreport_20200923.pdf
3901889_DMQCreport_20200113.pdf
3901893_DMQCreport_20200924.pdf
3901913_report_20200122.pdf
3901915_report_20200924.pdf
6901121_DMQCreport_20200925.pdf
6901174_DMQCreport_20200803.pdf

In around end of October/November, we are planning another sprint of DMQC analysis of our floats, so we will have more floats/updates. At the moment, I have only a few more recent DMQC-ed floats affected by some salty drift.

2901096_DMQCreport_20200602.pdf
2901102_DMQCreport_20200407.pdf
3901500_DMQCreport_20200311.pdf
3901511_DMQCreport_20200407.pdf
1901305_DMQCreport_20200407.pdf
1901909_DMQCreport_20200602.pdf

All the best,
Kamila

[gmaze]

It would be very efficient for operators to be able to report in a single place these floats
The table would be exhaustive and always up to date.

[BSHbirgit]

Dear all

to prepare the issue for ADMT I have created a google docs with the europe floats that have fast salty drift. The link is given below and you should hopefully all be able to view it and make changes when you are updating your dmqc. I started with a word document, but if you think another format would be more helpful please make suggestions.

https://docs.google.com/document/d/14I0iIHE5HAYVY6k-FCgCZVAiqGqbkUime4N4A7G5gHU/edit?usp=sharing

[Anto79124]

Dear all,
I kindly ask you some comments and suggestions about the float WMO 6901833 that seems to have some characteristics of a fast salty drifter.
I applied the OW method on the float deployed in Black Sea which is still active. I am attaching you the configuration file, figures 3 and 6 of the procedure, TS and TS with mapped historical data.
The difference between SAL and cal_SAL is:

• 0.01 (increasing) from cycle 57

• 0.05 from cycle 289

la_mapsalerrors is larger than 0.01.

After discussing with Giulio, we decided to apply correction with uncertainty =0.02 and flag 2.
What do you think?
Thanks
Antonella

Config_file_OW.docx
Figures_WMO_6901833.docx

[BSHbirgit]

Dear Antonella

I had a quick look at your word document and am no expert on the Black Sea. The validity of the linear fit of corrections certainely need larger errors with corrections as large as 0.05 than in cases with smaller range of correction. But I assume that an error of 0.02 and a QC of 2 is fair warning to the users that the data have lesse than ideal quality. Do you have any other floats nearby with which you could check your corrected data? I think in these case we all go by our gut feeling and give the float the benefit of reasonable doubt.

Greetings, Birgit