Argo profile pressure correction

This page is automatically created by code which scans all files in the Argo USGODAE GDAC.

Plots and listings analysing the pressure correction for floats of each DAC are accessed through the Plots Index Tables.


Summary stats of DAC vs Audit pressure correction differences

Pressure Correction (all floats)
AOMLBODCCORIOLISCSIROGTSJMAMEDSCSIOINCOISKMAKORDITotal all DACs
# floats40363781306511211013171102511471198278
Any DM2918297927334-81421990146114-5859
DM - missing P ADJ--24---103-18-55
RT - missing P ADJ11151105-14566712721433
New format tech4034377130651021095316100250147918228
SP offset deduced4034377130651021095316100250147918228
P=Praw-SP2059336730505-92228097241130875387
P type unknown273181146-36371361732552
Pcor varies in prof1-3--64----14
Some Praw-Padj30233561100500-97130290236130386746
Some valid SP383936011895041106230897245130-7735
Some DAC vs Audit test30223561097500-97030284236130-6697
Results of DAC vs Audit Pcor comparisons - Auto-correcting floats
All agree131524400--7-----1746
All diffs < 1dbar4----43-----47
Some diffs > 1dbar3----21-----24
80% > 1dbar------------
Results of DAC vs Audit Pcor comparisons - Correction-required floats
Prof data but no SP--3--1----3842
All agree1270263289430-7811283914339-3382
All diffs < 1dbar3946430359-8777407154-1149
Some diffs > 1dbar3051911-257352237-227
80% > 1dbar--3--1462915-76
Median Min Adjusted Profile Pressure
Med MPP < 2.5dbar5252303-331-15--339
Med MPP < 7.5dbar2797280765473-8662356721848355784
Med MPP < 12.513665718-7064232533432
Med MPP > 12.52665395-11-128-166


Pressure Correction [apex floats only]
AOMLBODCCORIOLISCSIROGTSJMAMEDSCSIOINCOISKMAKORDITotal all DACs
# floats1990350604495-86628290225138935133
Any DM1253273423322-71718984140114-3515
DM - missing P ADJ--15---103-18-46
RT - missing P ADJ11151105--4566712721432
New format tech1990349604495-86228290224138915125
SP offset deduced1990349604495-86228290224138915125
P=Praw-SP1932334598490-86028089221130875021
P type unknown581665-621486112
Pcor varies in prof1-3--64----14
Some Praw-Padj1570332597486-86027884221130384596
Some valid SP1943334595489-85928089221130-4940
Some DAC vs Audit test1569332594486-85927884221130-4553
Results of DAC vs Audit Pcor comparisons - Auto-correcting floats
All agree------------
All diffs < 1dbar------------
Some diffs > 1dbar------------
80% > 1dbar------------
Results of DAC vs Audit Pcor comparisons - Correction-required floats
Prof data but no SP--3--1----3842
All agree1150263273417-7701283914239-3221
All diffs < 1dbar3896430358-7977406854-1132
Some diffs > 1dbar3051811-97351137-199
80% > 1dbar--2---462-15-65
Median Min Adjusted Profile Pressure
Med MPP < 2.5dbar619---1-15--32
Med MPP < 7.5dbar1503261514468-8532346720348354186
Med MPP < 12.55255316-541172533247
Med MPP > 12.5765181-11-128-122

Table updated on 06-Mar-2012, GDAC state as at 04 March 2012


Explanation of categories


All values are the number of floats exhibiting the described conditions for each DAC.

# floats number of floats in total
Any DM number of floats with any DM files
DM - missing P ADJ floats with some DM files having empty or missing PRES_ADJUSTED (where there is a non-empty PRES profile)
RT - missing P ADJ floats with some RT files having empty or missing PRES_ADJUSTED (where there is a non-empty PRES profile)
New format tech tech file has new format

The following pressure correction aspects are deduced for each float based on the Surface Pressure Offset parameter name.
These deductions are recorded in this table.


SP offset deduced the Apex SP adjustment (ie 5 dbar, or 0 dbar) can be resolved (or guessed) from the surface pressure parameter name
P=Praw-SP pressure does required correction by subtracting SP
P type unknown don't know if is the above type of float
Pcor varies in prof Praw-Padj is not constant through profile. This now excludes SOLOs where deepest ADJUSTED pressure is correct forincomplete bin averaging.
Some Praw-Padj float does have some Praw and corresponding Padj values, so a "DAC correction" can be resolved.
Some valid SP tech file has some plausible SP values (only required where pressure has to be corrected with SP)
Some DAC vs Audit test some pressure correction comparisons can be made for these floats
All agree all DAC corrections agree exactly with our estimates
All diffs < 1dbar some discrepancy, but these are all < 1dbar
Some diffs > 1dbar some discrepancies are large (> 1 dbar)
80% > 1dbar 80% of DAC corrections disagree with our estimatesby at least 1dbar
The minimum (ie near-surface) profile pressure value will normally be about 5 dbar for the Apex floats. We examine the median of these values for each float series, as another coarse guide to correct calibration.
Med MPP < 2.5dbar (such cases often have MPP near zero - maybe self-calibrating pressure?)
Med MPP < 7.5dbar 2.5< MPP<7.5 - mostly close to 5 dbar
Med MPP < 12.5 7.5< MPP<12.5 - many of these are ~ 10dbar ??
Med MPP > 12.5 presumably some bad pressures

 

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