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
# floats35433241182361373958300671951421197564
Any DM2591276733278-7562044114698-5123
DM - missing P ADJ32117---411-18-182
RT - missing P ADJ2145943554-561004483-2809
New format tech353932311803603739522995619414247422
SP offset deduced29683061029355-93128656187116-6234
P=Praw-SP29683061029355-93125856187116-6206
P type unknown4121-61111-115142
Pcor varies in prof3-1--610----20
Some Praw-Padj2595300882351-90528541187116-5662
Some valid SP29463061025355-92228656187116-6199
Some DAC vs Audit test2168288805342-86727535184114-5078
Results of DAC vs Audit Pcor comparisons - Auto-correcting floats
All agree------22----22
All diffs < 1dbar------1----1
Some diffs > 1dbar------------
80% > 1dbar------------
Results of DAC vs Audit Pcor comparisons - Correction-required floats
Prof data but no SP17-2--6-----25
All agree846223381282-6881041610844-2692
All diffs < 1dbar8425832751-9179155637-1556
Some diffs > 1dbar4807979-886942033-807
80% > 1dbar359137--63473814-532
Median Min Adjusted Profile Pressure
Med MPP < 2.5dbar282168--291-14--242
Med MPP < 7.5dbar2371268622334-8052183317037-4858
Med MPP < 12.514856310-69648353-423
Med MPP > 12.53325255-11--25-115


Pressure Correction [apex floats only]
AOMLBODCCORIOLISCSIROGTSJMAMEDSCSIOINCOISKMAKORDITotal all DACs
# floats1719298530348180826557176133794414
Any DM1134252350266-6621843514098-3121
DM - missing P ADJ12101---151-18-138
RT - missing P ADJ127891214-9884383-1545
New format tech171829752934818032655617513314326
SP offset deduced1661282499343-79925856172116-4186
P=Praw-SP1661282499343-79925856172116-4186
P type unknown111--5-11-7888
Pcor varies in prof--1--510----16
Some Praw-Padj1340276499340-80026135172116-3839
Some valid SP1661282495343-79225856172116-4175
Some DAC vs Audit test1329266472331-77525235170114-3744
Results of DAC vs Audit Pcor comparisons - Correction-required floats
Prof data but no SP--2--6-----8
All agree754215176272-6781041610744-2366
All diffs < 1dbar5135026250-8579155337-1144
Some diffs > 1dbar621349-126941033-234
80% > 1dbar2-20---473-14-86
Median Min Adjusted Profile Pressure
Med MPP < 2.5dbar4117---1-14--37
Med MPP < 7.5dbar1278248409329-7942173315537-3500
Med MPP < 12.5434628-4412353-220
Med MPP > 12.51123101-11--25-72

Table updated on 23-Dec-2010, GDAC state as at 18-Dec-2010


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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