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 float types]
AOMLBODCCORIOLISCSIROGTSJMAMEDSCSIOINCOISKMAKORDITotal all DACs
# floats34713181163340373940300621851421197413
New format tech340731711613393739342995118414247211
SP offset deduced3208300101233509162915117811606407
P=Praw-SP240229599633508202915117811605484
P type unknown641210611110115202
Pcor varies in prof9514196245060713059002075
Some Praw-Padj257129485233108942854117811605562
Some valid SP130527045732908042613516411603741
Some DAC vs Audit test247029480033108822843517811605390
Results of DAC vs Audit Pcor comparisons
All agree17772454972950787115161104503887
All diffs < 1dbar58840230270468413503701115
Some diffs > 1dbar105973904985618340388
All disagree540311044770120156
Median Min Adjusted Profile Pressure
Med MPP < 2.5dbar2721510029101400224
Med MPP < 7.5dbar23532676033160794218331613704782
Med MPP < 12.514756790696483530425
Med MPP > 12.5322025501100250109


Pressure Correction [apex floats only]
AOMLBODCCORIOLISCSIROGTSJMAMEDSCSIOINCOISKMAKORDITotal all DACs
# floats1709292515327179626552168133794337
New format tech169629151432717912655116713314237
SP offset deduced164227647832307902635116411604103
P=Praw-SP164227646232307902635116411604087
P type unknown1311005011078100
Pcor varies in prof6604195237054513059001713
Some Praw-Padj131727047532007892613516411603747
Some valid SP130527045732007822613516411603710
Some DAC vs Audit test130027047132007822613516411603719
Results of DAC vs Audit Pcor comparisons
All agree68122116928707699316994502380
All diffs < 1dbar5554023027028313493701036
Some diffs > 1dbar64972601185616340303
All disagree200300014770120117
Median Min Adjusted Profile Pressure
Med MPP < 2.5dbar41600010140026
Med MPP < 7.5dbar12602473903110783217331473703425
Med MPP < 12.5424667044123530222
Med MPP > 12.510181010110025066

Table updated on 10-Nov-2010, GDAC state as at 30-Oct-2010


Explanation of categories


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

# floats number of floats in total
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 is known (or guessed)
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
Some Praw-Padj float does have some Praw and corresponding Padj values
Some valid SP tech file has some plausible SP values
Some DAC vs Audit test some pressure correction comparisons can be made for these floats (excludes SOLO floats and some others)
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)
All disagree all DAC corrections disagree with our estimates
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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