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 [apex floats only]
AOMLBODCCORIOLISCSIROGTSJMAMEDSCSIOINCOISKMAKORDITotal all DACs
# floats1924320596453-84828280211143884945
Any DM1188267402322-71018457140101-3371
DM - missing P ADJ-256---122-18-90
RT - missing P ADJ115090257-8715833621477
New format tech1922319595453-84128280210143864931
SP offset deduced1922319595453-84128280210143864931
P=Praw-SP1861304583448-83328079207130824807
P type unknown6316135-15214136138
Pcor varies in prof-----59----14
Some Praw-Padj1500302587444-83927857207130504394
Some valid SP1874304586447-83228079207130-4739
Some DAC vs Audit test1499302583444-83227857207130-4332
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--2--7----5059
All agree1098230270375-7341283413456-3059
All diffs < 1dbar3716727260-7979186338-1047
Some diffs > 1dbar305359-127151036-213
80% > 1dbar2-20---462-14-84
Median Min Adjusted Profile Pressure
Med MPP < 2.5dbar4182--1-15--31
Med MPP < 7.5dbar1434252496428-8332344818850454008
Med MPP < 12.55256112-44193545246
Med MPP > 12.5844181-11-125-99


Summary stats of DAC vs Audit pressure correction differences

Pressure Correction (all floats)
AOMLBODCCORIOLISCSIROGTSJMAMEDSCSIOINCOISKMAKORDITotal all DACs
# floats391134812604663501072317952331521148318
Any DM2724291872334-80420463146101-5539
DM - missing P ADJ1271---382-18-132
RT - missing P ADJ2123943667-121836483622931
New format tech39063471259465350106431685232152868262
SP offset deduced39063471259465350106431685232152868262
P=Praw-SP2654306801460-89828084227130825922
P type unknown654181066350393711622321281
Pcor varies in prof3----59----17
Some Praw-Padj28243261065455-94830263222130506385
Some valid SP37253301157459-103130884227130-7451
Some DAC vs Audit test28223261061455-94130257222130-6316
Results of DAC vs Audit Pcor comparisons - Auto-correcting floats
All agree44624300--7-----777
All diffs < 1dbar2----43-----45
Some diffs > 1dbar1----21-----22
80% > 1dbar------------
Results of DAC vs Audit Pcor comparisons - Correction-required floats
Prof data but no SP1-2--7----5060
All agree1591230326385-7421283413556-3627
All diffs < 1dbar3766730161-8779186638-1093
Some diffs > 1dbar305659-287152136-270
80% > 1dbar2-32--1462914-106
Median Min Adjusted Profile Pressure
Med MPP < 2.5dbar3122132-301-15--294
Med MPP < 7.5dbar2617272741433-8472354820350455491
Med MPP < 12.513666514-6964153545431
Med MPP > 12.52746395-11-125-145

Table updated on 04-Nov-2011, GDAC state as at 01-Nov-2011


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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