1. The APEX Truncated Negative Pressure Drifts (TNPDs)
DMQC-4 agenda item 2.2
The APEX Truncated Negative Pressure Drifts (TNPDs)
● Can independent analyses be done on a regular basis? How to distribute their results to delayed-mode operators?
● How to qc APEX TNPDs? T-S analysis cannot detect pressure errors < ~|20| dbar. All APEX groups need to qc TNPD floats in delayed-mode in a consistent way.
● How to inform users? Is the CSIRO webpage updated/sufficient? See /~cow074/quota/argo_offsets.htm.

2. Any problems with the agreed delayed-mode procedures?
DMQC-4 agenda item 2.3
The APEX correctables
Any problems with the agreed delayed-mode procedures?
(See Argo QC Manual Version 2.4, p )

3. Delayed-mode progress from each APEX group on pressure correction
DMQC-4 agenda item 2.4
Delayed-mode progress from each APEX group on pressure correction
APEX group
(in alphabetical order)
Implemented DM PRES CORR for new D-files?
Re-processed old D-files with DM PRES CORR?
Expected date of completion
AOML/PMEL - US
YES
N/A
AOML/UW - US
BODC - UK
CHINA
CORIOLIS - FRANCE, GERMANY, etc …
CSIRO - AUSTRALIA
INCOIS - INDIA
JAMSTEC - JAPAN
KOREA
MEDS - CANADA

4. Thoughts on pressure accuracy after adjustment
DMQC-4 agenda item 2.4 (cont.)
Thoughts on pressure accuracy after adjustment
The current model of pressure correction:
PRES_ADJUSTED = PRES − SP
improves the pressure data, but does not account for all pressure errors.
Lab tests have shown that the pressure sensor drift rate has a slope and an offset. The offset also is temperature-dependent. However, these parameters cannot be determined unless the floats are retrieved for laboratory re-calibration. So the current adjustment method is still the best we can do.
After correcting for gross pressure drift, data are accurate to a few decibars … implications for ocean heat budget estimates.

5. DMQC-4 agenda item 2.5
Do SOLO, PROVOR, NEMO, NINJA floats need additional pressure qc to detect Druck microleaks?

6. Editting real-time qc flags in delayed-mode
DMQC-4 agenda item 4
Editting real-time qc flags in delayed-mode
Change definitions of PARAM and PARAM_QC in User’s Manual and QC Manual:-
▪ PARAM contains the raw values telemetered from the floats. PARAM = PRES, TEMP, CNDC, PSAL.
(DOXY should have its own definition.)
▪ PARAM_QC contains qc flags that pertain to the values in PARAM. Values in PARAM_QC are set initially in ‘R’ and ‘A’ modes by the automatic real-time tests. They are later modified in ‘D’ mode at levels where the qc flags are set incorrectly by the real-time procedures, and where erroneous data are not detected by the real-time procedures.

7. Good data that may contain small sensor drift. 1 or 2 or 3
DMQC-4 agenda item 4 (cont.)
Raw flags
Raw flag comments
After DMQC 1
Good data.
No adjustment needed. 2
Good data that may contain small sensor drift.
1 or 2 or 3 3
Bad data that may be usable after adjustment. 4
Bad data. Do not use.

8. Delayed-mode flag comments
DMQC-4 agenda item 4 (cont.)
DM flags
Delayed-mode flag comments 1
Good data. 2
Probably good data. 3
An adjustment has been applied, but the value may still be bad. 4
Bad data. Not adjustable. Data replaced by ‘FillValue’.

9. Editting real-time qc flags in delayed-mode (cont.)
DMQC-4 agenda item 4 (cont.)
Editting real-time qc flags in delayed-mode
(cont.)
The need to keep copies of original R files. 9

10. 6.2. A dedicated DMQC website?
DMQC-4 agenda items 6.1, 6.2, 6.3
Miscellaneous issues
6.1. D files format errors. Can these be checked regularly, e.g. every 3 months with the Argo reference database update? Made output available on the same Coriolis ftp site?
6.2. A dedicated DMQC website?
(show Regional_Summary_table2.html)
6.3. Time delay in re-processing D files; e.g. after feedback from altimetry qc.

11. “Argo Data Management”
DMQC-4 agenda item 6.4
“Argo Data Management”
Pouliquen et al, Community White Paper to OceanObs09
The main actors in Argo data management are:
DACs, GDACs, ARCs, AIC, delayed-mode operators.