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Argo file format and Surface Pressure correction compliance Audit
Comments on Argo Audit using GDAC at 18-Dec-2010
Multiple SP parameters per profile
This is the first audit run to take account of multiple Surface Pressure
parameter names per cycle in the tech files. This takes two forms:
- Where the tech data is included twice for one cycle. Here the same SP
parameter and value appears twice. This is totally benign.
- Two different names are used for one or more cycles. This means that
software has to detect both names and decide which to use to determine the
pressure correction treatment for the float, and extract the corresponding
SP value. A simple preference scheme is implemented, so that a "BeforeReset"
value is used in preference to "AfterReset", for example.
This change has made results look worse for some groups as previously many
of the these floats were attributed SP names which implied auto-correction,
and indeed no DAC correction is found in many of these. There are now
apparently almost no "auto-correcting" floats!
A related anomaly is where the SP parameter name is not the same for all
cycles of a float. A number of these were detected but they may all have been
where no SP was reported for the first cycle only, which is benign and will be
ignored in future audits.
The above conditions are reported in the individual plot titles, and
in the per-float listings (multiple SP Param name codes are shown, or that
field is red if the name is not present and identical for every cycle. )
Counts of these conditions have been added near the bottom of the "Surface
Pressure Offset parameter name" table.
Changed order of gathering stats
Some statistics have changed because of reordering of selection and
counting in the code, and inclusion/exclusion of certain degenerate cases
(eg floats without any profiles, or of unknown type, or lacking any SP values.)
SP Parameter Name use
Where possible the audit code adheres to the Treatment vs SP Parameter Name
table recently published ( http://www.argodatamgt.org/content/download/5478/39874/file/Surface%20PressureCorrectionTable_Final.xls ). This has changed the
interpretation of some floats - especially that "BeforeReset", which are
auto-correcting, should benefit from post-correction. This interpretation is
still debated and clearly does not agree with the use by some DACs.
Many floats are probably pressure-corrected correctly, but are reported
as a discrepancy only because the provided Surface Pressure Parameter name implies
a different treatment to that applied by the DAC.
Pressure Correction changes within a profile
Most of these cases identified previously were due to a correct adjustment
of the deepest pressure value in SOLO floats. This condition has now been
allowed so there are now few reported cases.
SP spike filtering
SP spike filtering that is a slightly enhanced version of the recommended
RT filter is now used. Because this is non-standard it will give rise to
some differences, but then there will always be differences due to DM
manual intervention. [Do you want details of the spike filter?]
Argo Technical and Meta file compliance Audit
This page is automatically created by code which scans all files
in the Argo USGODAE GDAC.
Previous versions can be accessed via the
CSIRO DMQC page
This analysis was based on GDAC as at 18-Dec-2010
Float counts in DACs
DAC details [explanations]
DAC name | AOML | BODC | CORIOLIS | CSIRO | GTS | JMA | MEDS | CSIO | INCOIS | KMA | KORDI |
# floats | 3543 | 324 | 1182 | 361 | 373 | 958 | 300 | 67 | 195 | 142 | 119 |
# Projects | 8 | 6 | 47 | 1 | 2 | 18 | 3 | 1 | 2 | 3 | 2 |
# PIs | 17 | 5 | 59 | 1 | 2 | 15 | 5 | 2 | 3 | 5 | 1 |
# Models | 14 | 3 | 46 | 3 | 2 | 19 | 5 | 3 | 5 | 3 | 5 |
Floats in multiple DACS
DAC | AOML | BODC | CORIOLIS | CSIRO | GTS | JMA | MEDS | CSIO | INCOIS | KMA | KORDI |
# floats | 3543 | 324 | 1182 | 361 | 373 | 958 | 300 | 67 | 195 | 142 | 119 |
dups in GTS | 8 | 1 | 3 | 1 | - | 2 | - | - | - | - | 53 |
other dups | - | - | - | - | - | - | - | - | - | 9 | 9 |
Meta files
Meta files [explanations]
DAC name | AOML | BODC | CORIOLIS | CSIRO | GTS | JMA | MEDS | CSIO | INCOIS | KMA | KORDI |
# floats | 3543 | 324 | 1182 | 361 | 373 | 958 | 300 | 67 | 195 | 142 | 119 |
# meta files | 3543 | 324 | 1182 | 361 | 373 | 958 | 300 | 67 | 195 | 133 | 119 |
broken A | - | - | - | - | 372 | - | - | - | - | - | - |
broken B | - | - | 15 | - | 1 | - | - | - | - | - | - |
Bad launch info | 3 | - | - | - | - | - | - | - | - | - | - |
PLATFORM_MODEL The strings found in the PLATFORM_MODEL fields Strings have been converted to lower case and blanks removed to assist match-ups
field contents | AOML | BODC | CORIOLIS | CSIRO | GTS | JMA | MEDS | CSIO | INCOIS | KMA | KORDI | TOTAL |
Empty Field | - | - | - | - | 372 | - | - | - | - | - | - | 372 |
apex | - | - | - | - | 1 | - | 183 | - | - | 90 | 5 | 279 |
provor | - | - | 13 | 3 | - | - | 31 | - | 16 | - | 26 | 89 |
palace_n/a | 17 | - | - | - | - | - | - | - | - | - | - | 17 |
solo_sbe | 1416 | - | - | - | - | - | - | - | - | - | - | 1416 |
apex_sbe | 1522 | - | - | - | - | - | - | 56 | 4 | - | - | 1582 |
soloof_fsi | 28 | - | - | - | - | - | - | - | - | - | - | 28 |
solo_fsi | 272 | - | - | - | - | - | - | - | - | - | - | 272 |
apexir_sbe | 185 | - | - | - | - | - | - | 1 | - | - | - | 186 |
soloir_sbe | 80 | - | - | - | - | - | - | - | - | - | - | 80 |
apex_seascan | 10 | - | - | - | - | - | - | - | - | - | - | 10 |
apex_n/a | 2 | - | - | - | - | - | - | - | - | - | - | 2 |
solo_sbe41cp | 1 | - | - | - | - | - | - | - | - | - | - | 1 |
solo2ir_sbe | 2 | - | - | - | - | - | - | - | - | - | - | 2 |
provor_seascan | 1 | - | - | - | - | - | - | - | - | - | - | 1 |
provor_n/a | 6 | - | - | - | - | - | - | - | - | - | - | 6 |
provor_sbe | 1 | - | - | - | - | - | - | 10 | 1 | - | - | 12 |
apex-sbe | - | 298 | - | 348 | - | 794 | 81 | - | 172 | 43 | 39 | 1775 |
martec-fsi | - | 21 | - | - | - | - | - | - | - | - | - | 21 |
martec-sbe | - | 5 | - | - | - | - | - | - | - | - | - | 5 |
provor ctf2 | - | - | 62 | - | - | - | - | - | - | - | - | 62 |
apex sbe apf7 | - | - | 93 | - | - | - | - | - | - | - | - | 93 |
provor ctf3 | - | - | 38 | - | - | - | - | - | - | - | - | 38 |
provor cts2 | - | - | 168 | - | - | - | - | - | - | - | - | 168 |
apex sbe apf8 | - | - | 215 | - | - | - | - | - | - | - | - | 215 |
nemo | - | - | 90 | - | - | - | - | - | - | - | - | 90 |
nemo 2.5 | - | - | 4 | - | - | - | - | - | - | - | - | 4 |
provor cts3 | - | - | 171 | - | - | - | - | - | - | - | - | 171 |
apex sbe 41 apf8 | - | - | 7 | - | - | - | - | - | - | - | - | 7 |
arvor iridium | - | - | 4 | - | - | - | - | - | - | - | - | 4 |
provor cts3 do | - | - | 17 | - | - | - | - | - | - | - | - | 17 |
arvor | - | - | 4 | - | - | - | - | - | - | - | - | 4 |
provor cts3 4.82 | - | - | 20 | - | - | - | - | - | - | - | - | 20 |
apex sbe41 apf8 | - | - | 48 | - | - | - | - | - | - | - | - | 48 |
apex apf9a f/w w | - | - | 6 | - | - | - | - | - | - | - | - | 6 |
apex apf9a f/w | - | - | 55 | - | - | - | - | - | - | - | - | 55 |
metocean 1 | - | - | 1 | - | - | - | - | - | - | - | - | 1 |
provor cts3 do 9 | - | - | 15 | - | - | - | - | - | - | - | - | 15 |
apex apf8 rev da | - | - | 4 | - | - | - | - | - | - | - | - | 4 |
apex-apf8c | - | - | 12 | - | - | - | - | - | - | - | - | 12 |
apex apf8 rey da | - | - | 2 | - | - | - | - | - | - | - | - | 2 |
provor t | - | - | 35 | - | - | - | - | - | - | - | - | 35 |
provor 1 | - | - | 2 | - | - | - | - | - | - | - | - | 2 |
apex sbe apf8b s | - | - | 3 | - | - | - | - | - | - | - | - | 3 |
apex sbe apf8b | - | - | 14 | - | - | - | - | - | - | - | - | 14 |
apex sbe apf8 s | - | - | 10 | - | - | - | - | - | - | - | - | 10 |
apex sbe apf8 sn | - | - | 11 | - | - | - | - | - | - | - | - | 11 |
apex sbe apf8 2 | - | - | 1 | - | - | - | - | - | - | - | - | 1 |
apex sbe apf8 | - | - | 1 | - | - | - | - | - | - | - | - | 1 |
apex sbe-43f apf | - | - | 3 | - | - | - | - | - | - | - | - | 3 |
apex apf9a f/w s | - | - | 3 | - | - | - | - | - | - | - | - | 3 |
apex-apf9 | - | - | 18 | - | - | - | - | - | - | - | - | 18 |
apex 19 | - | - | 1 | - | - | - | - | - | - | - | - | 1 |
provor bioargo | - | - | 1 | - | - | - | - | - | - | - | - | 1 |
2625 | - | - | 1 | - | - | - | - | - | - | - | - | 1 |
apex-apf9a | - | - | 2 | - | - | - | - | - | - | - | - | 2 |
apex-apf9i | - | - | 4 | - | - | - | - | - | - | - | - | 4 |
apex sbe-41-alac | - | - | 3 | - | - | - | - | - | - | - | - | 3 |
apex sbe-1-alace | - | - | 1 | - | - | - | - | - | - | - | - | 1 |
apex sbe -41-ala | - | - | 2 | - | - | - | - | - | - | - | - | 2 |
apex sbe-41 ap | - | - | 2 | - | - | - | - | - | - | - | - | 2 |
apex sbe-41 apf | - | - | 8 | - | - | - | - | - | - | - | - | 8 |
apex sbe-41 a | - | - | 1 | - | - | - | - | - | - | - | - | 1 |
provor ct | - | - | 5 | - | - | - | - | - | - | - | - | 5 |
apex sbe -41 apf | - | - | 1 | - | - | - | - | - | - | - | - | 1 |
r1-sbe | - | - | - | 10 | - | 2 | - | - | - | - | - | 12 |
palace | - | - | - | - | - | 4 | - | - | - | - | - | 4 |
alace_r1-fsi | - | - | - | - | - | 2 | - | - | - | - | - | 2 |
r1-sbe profiler | - | - | - | - | - | 1 | - | - | - | - | - | 1 |
r1-td | - | - | - | - | - | 9 | - | - | - | - | - | 9 |
provor-sbe | - | - | - | - | - | 83 | - | - | - | - | - | 83 |
ninja-tsk | - | - | - | - | - | 3 | - | - | - | - | - | 3 |
ninja-sbe | - | - | - | - | - | 12 | - | - | - | - | - | 12 |
tem. profiler | - | - | - | - | - | 1 | - | - | - | - | - | 1 |
apex-sbe-aandera | - | - | - | - | - | 7 | - | - | - | - | - | 7 |
provor-sbe cts-3 | - | - | - | - | - | 13 | - | - | - | - | - | 13 |
ninja-sbe-flntu | - | - | - | - | - | 2 | - | - | - | - | - | 2 |
nemo-sbe | - | - | - | - | - | 9 | - | - | - | - | - | 9 |
arvor-sbe | - | - | - | - | - | 6 | - | - | - | - | - | 6 |
apex-fsi | - | - | - | - | - | 3 | - | - | - | - | - | 3 |
pops-sbe | - | - | - | - | - | 2 | - | - | - | - | - | 2 |
apex-td profiler | - | - | - | - | - | 4 | - | - | - | - | - | 4 |
pops-provor-sbe | - | - | - | - | - | 1 | - | - | - | - | - | 1 |
p-alace | - | - | - | - | - | - | 4 | - | - | - | - | 4 |
apex-sbe/optode | - | - | - | - | - | - | 1 | - | - | - | - | 1 |
provor_fsi | - | - | - | - | - | - | - | - | 2 | - | - | 2 |
260apex | - | - | - | - | - | - | - | - | - | - | 14 | 14 |
apex-sbe_do | - | - | - | - | - | - | - | - | - | - | 35 | 35 |
Basic MODEL Grouping PLATFORM_MODEL fields by stanard float types
Basic type | AOML | BODC | CORIOLIS | CSIRO | GTS | JMA | MEDS | CSIO | INCOIS | KMA | KORDI | TOTAL |
Unknown | - | - | 3 | - | 372 | 6 | 4 | - | - | 9 | 14 | 408 |
apex | 1719 | 298 | 530 | 348 | 1 | 808 | 265 | 57 | 176 | 133 | 79 | 4414 |
solo | 1799 | - | - | - | - | - | - | - | - | - | - | 1799 |
provor | 8 | - | 547 | 3 | - | 96 | 31 | 10 | 19 | - | 26 | 740 |
nemo | - | - | 94 | - | - | 9 | - | - | - | - | - | 103 |
ninja | - | - | - | - | - | 17 | - | - | - | - | - | 17 |
martec | - | 26 | - | - | - | - | - | - | - | - | - | 26 |
palace | 17 | - | - | - | - | 4 | - | - | - | - | - | 21 |
arvor | - | - | 8 | - | - | 6 | - | - | - | - | - | 14 |
r1 | - | - | - | 10 | - | 12 | - | - | - | - | - | 22 |
PLATFORM_MODEL field - APF9 Status [explanations]
| AOML | BODC | CORIOLIS | CSIRO | GTS | JMA | MEDS | CSIO | INCOIS | KMA | KORDI | TOTAL |
Not APEX | 1824 | 26 | 651 | 13 | 372 | 150 | 35 | 10 | 19 | 9 | 26 | 3135 |
APEX not APF9 | - | - | 421 | - | - | - | - | - | - | - | - | 421 |
APEX unknown | 1719 | 298 | 22 | 348 | 1 | 808 | 265 | 57 | 176 | 133 | 93 | 3920 |
APEX APF9 | - | - | 88 | - | - | - | - | - | - | - | - | 88 |
Manual list* | 301 | - | - | 12 | - | - | - | - | - | - | - | 313 |
SENSOR pressure field * Sensor names converted to lower case and blanks removed to assist match-ups
* | AOML | BODC | CORIOLIS | CSIRO | GTS | JMA | MEDS | CSIO | INCOIS | KMA | KORDI | TOTAL |
Empty Field | - | 4 | 873 | - | - | 5 | 300 | - | - | - | 119 | 1301 |
druck | 67 | - | - | 292 | - | - | - | - | 170 | - | - | 529 |
mp40-c-2000-g | 14 | - | - | - | - | - | - | - | - | - | - | 14 |
n/a | 1486 | - | 88 | - | - | - | - | - | - | - | - | 1574 |
sbe41 | 341 | - | - | - | - | 407 | - | 24 | 5 | - | - | 777 |
sbe | 1 | - | - | - | - | - | - | - | - | - | - | 1 |
2900psia | 1196 | - | 79 | - | - | - | - | 43 | - | - | - | 1318 |
sbe41cp | 426 | - | 16 | - | - | 21 | - | - | - | - | - | 463 |
sstd | 10 | - | - | - | - | - | - | - | - | - | - | 10 |
2000dbar | 1 | - | - | - | - | - | - | - | - | - | - | 1 |
1500psia | 1 | - | - | - | - | - | - | - | - | - | - | 1 |
sbe-41 | - | 295 | - | - | - | - | - | - | - | - | - | 295 |
ectp202mar | - | 21 | - | - | - | - | - | - | - | - | - | 21 |
sbe-41cp | - | 4 | - | - | - | - | - | - | - | - | - | 4 |
sbe41cp-2900psia | - | - | 19 | - | - | - | - | - | - | - | - | 19 |
sbe41cp?2900psia | - | - | 63 | - | - | - | - | - | - | - | - | 63 |
none | - | - | 6 | - | - | - | - | - | - | - | - | 6 |
3000psia | - | - | 8 | - | - | - | - | - | - | - | - | 8 |
xxxx | - | - | 7 | - | - | - | - | - | - | - | - | 7 |
41 | - | - | 1 | - | - | - | - | - | - | - | - | 1 |
sbe41cp2900psia | - | - | 4 | - | - | - | - | - | - | - | - | 4 |
1600psia | - | - | 3 | - | - | - | - | - | - | - | - | 3 |
paine | - | - | - | 38 | - | - | - | - | - | - | - | 38 |
amatek | - | - | - | 19 | - | - | - | - | - | - | - | 19 |
paine3000psia | - | - | - | 2 | - | - | - | - | 18 | - | - | 20 |
kistler | - | - | - | 10 | - | - | - | - | - | - | - | 10 |
straingauge_sbe41 | - | - | - | - | - | 400 | - | - | - | - | - | 400 |
straingauge | - | - | - | - | - | 26 | - | - | - | - | - | 26 |
straingauge_sbe41cp | - | - | - | - | - | 92 | - | - | - | - | - | 92 |
straingauge_ctd-f01 | - | - | - | - | - | 3 | - | - | - | - | - | 3 |
sbe41,2900psias/n4867 | - | - | - | - | - | 1 | - | - | - | - | - | 1 |
sbe41,3000psias/n2657701518 | - | - | - | - | - | 1 | - | - | - | - | - | 1 |
sbe37 | - | - | - | - | - | 2 | - | - | - | - | - | 2 |
fsi41 | - | - | - | - | - | - | - | - | 2 | - | - | 2 |
sbecp41 | - | - | - | - | - | - | - | - | - | 133 | - | 133 |
SENSOR pressure Maker field * names converted to lower case and blanks removed to assist match-ups
* | AOML | BODC | CORIOLIS | CSIRO | GTS | JMA | MEDS | CSIO | INCOIS | KMA | KORDI | TOTAL |
Empty Field | - | 4 | 874 | - | - | 9 | - | - | - | - | 119 | 1006 |
micron | 14 | - | - | - | - | - | - | - | - | - | - | 14 |
paines | 91 | - | - | - | - | - | - | - | - | - | - | 91 |
sbe | 918 | - | 2 | - | - | - | 300 | 24 | 5 | 133 | - | 1382 |
n/a | 96 | - | 81 | - | - | - | - | - | - | - | - | 177 |
druck | 2328 | - | 173 | - | - | - | - | 43 | - | - | - | 2544 |
2900psia | 67 | - | - | - | - | - | - | - | - | - | - | 67 |
kistler | 5 | - | - | - | - | - | - | - | - | - | - | 5 |
seascan | 11 | - | - | - | - | - | - | - | - | - | - | 11 |
ametec | 12 | - | - | - | - | - | - | - | - | - | - | 12 |
paine | 1 | - | 4 | - | - | - | - | - | - | - | - | 5 |
seabird | - | 299 | - | 361 | - | - | - | - | 188 | - | - | 848 |
fsi | - | 21 | - | - | - | 1 | - | - | 2 | - | - | 24 |
martec | - | - | 7 | - | - | - | - | - | - | - | - | 7 |
sea-birdelectronics | - | - | 3 | - | - | - | - | - | - | - | - | 3 |
manufacturerdruck | - | - | 6 | - | - | - | - | - | - | - | - | 6 |
ametek | - | - | 7 | - | - | - | - | - | - | - | - | 7 |
xxxx | - | - | 9 | - | - | - | - | - | - | - | - | 9 |
none | - | - | 1 | - | - | - | - | - | - | - | - | 1 |
sea-birdelectronics,inc._druck | - | - | - | - | - | 546 | - | - | - | - | - | 546 |
sea-birdelectronics,inc. | - | - | - | - | - | 164 | - | - | - | - | - | 164 |
sea-birdelectronics,inc.(druck) | - | - | - | - | - | 85 | - | - | - | - | - | 85 |
sea-birdelectronics,inc._kistler | - | - | - | - | - | 71 | - | - | - | - | - | 71 |
falmouthscientific,inc. | - | - | - | - | - | 4 | - | - | - | - | - | 4 |
sea-birdelectronics,inc._paine | - | - | - | - | - | 13 | - | - | - | - | - | 13 |
sea-birdelectronics,inc._ametek | - | - | - | - | - | 59 | - | - | - | - | - | 59 |
thetsurumi-seikico.,ltd. | - | - | - | - | - | 3 | - | - | - | - | - | 3 |
notspecified | - | - | - | - | - | 1 | - | - | - | - | - | 1 |
sea-birdelectronics,inc | - | - | - | - | - | 1 | - | - | - | - | - | 1 |
sea-birdelectronics,inc._ | - | - | - | - | - | 1 | - | - | - | - | - | 1 |
SENSOR pressure Serial Number field
S/N | AOML | BODC | CORIOLIS | CSIRO | GTS | JMA | MEDS | CSIO | INCOIS | KMA | KORDI | TOTAL |
# floats | 3543 | 324 | 1182 | 361 | 373 | 958 | 300 | 67 | 195 | 142 | 119 |
No decodable number | 430 | 9 | 1092 | - | 373 | 20 | 141 | 1 | 16 | 19 | 119 | 2220 |
tech files
Tech files [explanations]
Format | AOML | BODC | CORIOLIS | CSIRO | GTS | JMA | MEDS | CSIO | INCOIS | KMA | KORDI | TOTAL |
No profiles | 148 | 18 | 66 | 6 | 373 | 12 | 5 | 4 | 8 | 26 | 119 | 785 |
Missing | - | - | - | - | - | - | - | - | - | - | - | - |
|
Old | 1 | - | - | - | - | - | - | 7 | - | - | - | 8 |
Old - Bad | - | - | - | - | - | - | - | - | - | - | - | - |
|
New | 3394 | 306 | 1116 | 355 | - | 946 | 295 | 56 | 187 | 116 | - | 6771 |
New, no Surf Pres | - | - | - | - | - | - | - | - | - | - | - | - |
New, Bad format | 75 | - | 82 | - | - | 15 | 4 | - | - | - | - | 176 |
|
V 2.3 | 3394 | 306 | 1116 | 355 | - | 946 | 295 | 56 | 187 | 116 | - | 6771 |
Surface Pressure Offset parameter name
| AOML | BODC | CORIOLIS | CSIRO | GTS | JMA | MEDS | CSIO | INCOIS | KMA | KORDI | TOTAL |
Old format |
Other | 2 | - | 2 | 1 | - | 6 | 1 | 4 | 1 | - | 115 | 132 |
surface_pressure | - | 1 | - | - | - | - | - | - | - | - | - | 1 |
surface_offset | - | - | - | - | - | - | - | - | - | - | - | - |
pressure_sensor_offset | - | - | - | - | - | - | - | - | - | - | - | - |
start_surface_pressure | 1 | - | - | - | - | - | - | - | - | - | - | 1 |
pressure_offset_(counts) | 1 | - | - | - | - | - | - | - | - | - | - | 1 |
pressure_offset_(dbar) | - | - | - | - | - | - | - | 7 | - | - | - | 7 |
New format |
Missing | 456 | - | 97 | 4 | - | 17 | 9 | - | - | - | - | 583 |
pres_surfaceoffsettruncatedplus5dbar_dbar | 1051 | 244 | 404 | 218 | - | 669 | 213 | 42 | 139 | 104 | - | 3084 |
pres_surfaceoffsettruncated_dbar | - | - | - | - | - | 2 | - | - | - | - | - | 2 |
pres_surfaceoffsetnottruncatedplus5dbar_dbar | - | - | - | - | - | 4 | - | - | - | - | - | 4 |
pres_surfaceoffsetnottruncated_dbar | 1357 | 57 | 392 | 137 | - | 147 | 45 | 14 | 48 | 12 | - | 2209 |
pres_surfaceoffsetbeforereset_dbar | 496 | - | - | - | - | 3 | - | - | - | - | - | 499 |
pres_surfaceoffsetbeforereset_1dbarresolution_dbar | - | 5 | 167 | - | - | 51 | - | - | - | - | - | 223 |
pres_surfaceoffsetbeforereset_1cbarresolution_dbar | - | - | 66 | - | - | 48 | - | - | - | - | - | 114 |
pres_surfaceoffsetafterreset_dbar | - | - | - | - | - | - | - | - | - | - | - | - |
pres_offsetadjustment_dbar | 64 | - | - | - | - | - | - | - | - | - | - | 64 |
pressure_offset_dbar | - | - | - | - | - | - | 28 | - | - | - | - | 28 |
pres_surfacecomplement_dbar | - | - | - | - | - | - | - | - | - | - | - | - |
pres_surface_dbar | - | - | - | - | - | - | - | - | - | - | - | - |
pres_surfaceoffsettruncatedplus3dbar_dbar | - | - | - | - | - | 1 | - | - | - | - | - | 1 |
pres_surfaceoffsetnottrancated_dbar | - | - | - | - | - | 6 | - | - | - | - | - | 6 |
|
Multiple SP names per profile | 390 | - | 20 | - | - | 10 | - | - | - | - | - | 420 |
SP name changes thru float lifetime | 130 | - | - | - | - | - | - | - | - | - | - | 130 |
|
% ok SP values [explanation] | 83 | 97 | 96 | 99 | - | 96 | 97 | 99 | 100 | 100 | - | - |
Surface Pressure Offset parameter name vs model
| apex | solo | provor | nemo | ninja | martec | palace | arvor | r1 | Unknown | All models |
Other | 87 | 1 | 33 | - | - | - | - | - | - | 11 | 121 |
surface_pressure | 1 | - | - | - | - | - | - | - | - | - | 1 |
surface_offset | - | - | - | - | - | - | - | - | - | - | - |
pressure_sensor_offset | - | - | - | - | - | - | - | - | - | - | - |
start_surface_pressure | - | - | - | - | - | - | 1 | - | - | - | 1 |
pressure_offset_(counts) | - | 1 | - | - | - | - | - | - | - | - | 1 |
pressure_offset_(dbar) | - | - | 7 | - | - | - | - | - | - | - | 7 |
Missing | 43 | 407 | 14 | 85 | 14 | - | 16 | - | - | 4 | 579 |
pres_surfaceoffsettruncatedplus5dbar_dbar | 3071 | - | - | - | - | - | - | - | 12 | 1 | 3083 |
pres_surfaceoffsettruncated_dbar | - | - | - | - | - | - | - | - | - | 2 | - |
pres_surfaceoffsetnottruncatedplus5dbar_dbar | 4 | - | - | - | - | - | - | - | - | - | 4 |
pres_surfaceoffsetnottruncated_dbar | 1105 | 747 | 312 | 6 | - | 19 | 4 | 2 | 9 | 5 | 2204 |
pres_surfaceoffsetbeforereset_dbar | - | 496 | - | - | 3 | - | - | - | - | - | 499 |
pres_surfaceoffsetbeforereset_1dbarresolution_dbar | - | - | 214 | - | - | 5 | - | 3 | - | 1 | 222 |
pres_surfaceoffsetbeforereset_1cbarresolution_dbar | - | - | 105 | - | - | - | - | 9 | - | - | 114 |
pres_surfaceoffsetafterreset_dbar | - | - | - | - | - | - | - | - | - | - | - |
pres_offsetadjustment_dbar | - | 64 | - | - | - | - | - | - | - | - | 64 |
pressure_offset_dbar | - | - | 28 | - | - | - | - | - | - | - | 28 |
pres_surfacecomplement_dbar | - | - | - | - | - | - | - | - | - | - | - |
pres_surface_dbar | - | - | - | - | - | - | - | - | - | - | - |
pres_surfaceoffsettruncatedplus3dbar_dbar | - | - | - | - | - | - | - | - | 1 | - | 1 |
pres_surfaceoffsetnottrancated_dbar | 6 | - | - | - | - | - | - | - | - | - | 6 |
Plots and listings analysing the Surface Pressure Offset
correction for
all floats for each DAC are accessed through the
Plots Index Tables. Separate tables link to all floats, or only floats
with apparent SP correction anomalies, or only floats with apparent TNPD.
Note: The following analyses were based on assumptions about
behaviour of different types of floats, where "type" was here primarily
defined by the Surface Pressure Offset parameter name. Some of these
assumptions will be wrong, and some types are not analysed at all because I
am unsure of their behaviour. It is probably necessary to also take basic float
model (eg Apex or SOLO) into account to fully determine the pressure correction
treatment required for a float, but it would be better if this could be fully
determined by just the parameter name. My assumptions are recorded in this
table.
Surface Pressure Offset
We have attempted to test for correct Surface Pressure (SP) correction of
profile pressure.
The difference between PRES and PRES_ADJUSTED is the DAC-applied
pressure correction (assuming PRES is the raw P as reported by the float.)
Correct application of this test depends on being able to deduce the
correct float type and P adjustment from the meta and tech files. However
this is not always possible due to missing or non-standard entries in these
files.
Our computed pressure correction is
p_calc = PRES - (SP - adjustment)
where adjustment is the known SP adjustment for a given float type (usually
5dbar).
For Apex floats the SP reported with a profile actually relates to the
previous profile, because it was recorded just as the float begins to
descend. RT profile pressure can only be adjusted with the SP reported with
the same profile, but in DM profiles the correct SP is used (ie for profile N,
p_calc(N) = PRES(N) - (SP(N+1) - adjustment)
So, in the provided plots , the "Calculated Surface Pressure" (CSP) is
For DM profiles: CSP = SP(N+1) - adjustment
For RT profiles: CSP = SP(N) - adjustment
For this reason, CSP will differ from Raw Surface Pressure by the "offset", and
will be displaced by one profile for DM profiles. The "DAC adjustment" should
however agree with the CSP.
Interpretting the plots: For complete agreement in pressure correction,
the "DAC Adjustment" (blue squares), should agree with the CSP (red stars).
Missing "DAC Adjustment" symbols can occur where there is no PRES_ADJUSTED profile
(eg if QC=4). Missing CSP symbols can occur where the DAC has provided an SP
estimate (possibly by interpolation) but the automated process has not [due to
different processing or because the tech files are not quite up-to-date.]
Disagreement is likewise visible where "MPP minus CSP" (cyan diamond) does
not overlay "Min Adjusted Pressure" (magenta square). The latter quantity is just
the near-surface PRES_ADJUSTED value.
A light gray background is used where disagreement is between 0.1 and 1.0 dbar.
This occurs frequently due to DAC smoothing of the SP series, or for other reasons.
A dark gray background indicates disagreement greater than 1.0 dbar. Some
of these cases are due to deficiencies in our automatic procedures, but some
others appear to be related to processing faults at the DACs.
See the table which summarizes the results
of this pressure correction audit for all DACs.
Lists: for each DAC a text file (accessable through the
Plots Index Tables) lists the result of checking the surface pressure correction for every
float. The floats are grouped by PI. The lists give the number of DM profiles,
total number of profiles, assumed surface pressure offset, and counts of profiles
which agree exactly or disagree with my automated correction. Please note
that in many cases the disagreement is because your DAC correction is a better
choice than my automated one.
Format example:
5900033 DM 264/295 SPoffs=5 Diffs(dbar) =0[271] <1 [0] >1 [ 1 *]
Of 295 profiles for this float, 264 have been DM processed. 271 profiles exactly
agree with my automated correction, 0 disagree by a small amount, but 1
disagrees by more than 1 dbar.
TNPD
Truncated Negative Drifting Pressure (TNPD) is a term used to describe
Apex floats which truncate negative surface pressure values (all firmware
prior to APF9) and the pressure sensor develops a strong negative drift. The
usual cause of strong negative drift in these sensors is the "microleak"
fault associated with Druck sensors. The pressure in profiles affected by
TNPD cannot be corrected for surface pressure offset.
The first step in detecting TNPD is to determine if a float is of the type
where such an fault might occur. We have attempted to do this using the tech
and meta files alone, but this is not always possible.
The next step is to find where the reported SP (corrected for 5dbar adjustment
if necessary) has "flat spots" on zero, indicating that negative values are being
truncated. Previously a float with 80% SP=0 was declared to be TNPD.
We now say that any susceptible float is in a TNPD state after the last
believable positive SP value. This is because the strong negative drift condition
is typically monotonic, so if such a condition has commenced then typical
variability will not give rise to small positive SP values.
The main difficulty of this approach [assuming the basic assumptions
are correct] is determining when isolated positive values are natural
perturbations about a small negative value, or when they are just sensor
error spikes. In the present analysis I have used (for the first time) the
crude test that a positive value > 1dbar which has 2 zero values
immediately either side of it, is a spike that can be ignored. [This differs to
the standard despiking process used to prepare the SP series for pressure
correction because here we just want a simple way of assessing where an SP series
is devoid of true +ve values.] Obviously this is very imperfect - there is no
substitute for skilled DM analysis, and in very
many cases the DAC will be right and our algorithm will be wrong.
Another deficiency of our algorithm is that is [apparently] extremely
unlikely that microleaking will start after years of correct operation. For
example, if SP is 0 for the last 5 of 200 profiles then the algorithm says
TNPD commenced at profile 196. The time of onset of TNPD is examined in this
set of TNPD plots. That page also includes plots
which examining whether, for different sensor
types, a large negative drift can be followed by recovery to plausible positive
SP values.
"Start of TNPD" in the surface pressure plots provided indicates where TNPD
appears to commences, according to the above algorithm, if that is at least 6
months before the last DM profile. If the condition is met with less than
6 months of subsequent DM profiles, then 'Potential TNPD' is displayed.
Where some of the float series has been DM processed,
extra information is provided for the DM profiles in an extra frame at the top
of the figure.
Extra information in upper frame on plots
Name | Colour/Where | Meaning |
P Adj QC | top half | profile minimum PRES_ADJUSTED_QC for each DM profile, value indicated by scale on left of frame |
DM | Lower middle | DM processed profiles |
No P ADJ | Lower middle | PRES_ADJUSTED profiles not populated |
TNPD Comment | Near bottom | Has correct pressure SCIENTIFIC_CALIB_COMMENT for a TNPD profile |
P ERR 2.4 | bottom | profile min PRES_ADJUSTED_ERROR==2.4 |
P ERR 20 | bottom | profile min PRES_ADJUSTED_ERROR==20 |
See the table which summarizes the results
of this TNPD treatment audit for all DACs.
Lists: for each DAC two text files (accessable through the
Plots Index Tables) list the result
of checking for TNPD. The floats are grouped by PI.
The "short" list gives the cycle number ("pn") where TNPD appears to start,
and counts of profiles which appear to require the TNPD comment string and do not
have it ("missed"),
or do have the comment string ("good"), or have a comment string which is not
precisely the standard string ("imperfect"). The list also notes where we have
NOT detected TNPD but have found the TNPD comment string.
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