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
# floats373633712984383501052316742241501108085
Any DM2694276868334-7592046314698-5442
DM - missing P ADJ22104---382-18-166
RT - missing P ADJ20611153478-104954373582841
New format tech37323361297437350104631564223150828032
SP offset deduced37323361297437350104631564223150828032
P=Praw-SP2555295945432-88827863217116785867
P type unknown647181816350433811734321367
Pcor varies in prof3----59----17
Some Praw-Padj27433131028428-94130063213116466191
Some valid SP35563191116432-100730663217116-7132
Some DAC vs Audit test27413131024428-93430057213116-6126
Results of DAC vs Audit Pcor comparisons - Auto-correcting floats
All agree43624126--7-----593
All diffs < 1dbar3----43-----46
Some diffs > 1dbar5----21-----26
80% > 1dbar1----------1
Results of DAC vs Audit Pcor comparisons - Correction-required floats
Prof data but no SP1-2--7----4656
All agree1551236518339-7331233413544-3713
All diffs < 1dbar3405128881-8980186837-1052
Some diffs > 1dbar292348-287351035-224
80% > 1dbar2-20--1482-14-87
Median Min Adjusted Profile Pressure
Med MPP < 2.5dbar272212--291-15--286
Med MPP < 7.5dbar2538270707408-8412334819537435320
Med MPP < 12.513566614-6964152533427
Med MPP > 12.53035365-11-125-134

Pressure Correction [apex floats only]
AOMLBODCCORIOLISCSIROGTSJMAMEDSCSIOINCOISKMAKORDITotal all DACs
# floats1831309590425-84328164202141844770
Any DM1164252401322-6651845714098-3283
DM - missing P ADJ-288---122-18-122
RT - missing P ADJ1161110248-9834233581501
New format tech1830308589425-83828164201141824759
SP offset deduced1830308589425-83828164201141824759
P=Praw-SP1767293559420-82727863198116784599
P type unknown6416315-16314256171
Pcor varies in prof-----59----14
Some Praw-Padj1424289562417-83327657198116464218
Some valid SP1779293562420-82627863198116-4535
Some DAC vs Audit test1423289558417-82627657198116-4160
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----4655
All agree1059236231329-7271233412444-2907
All diffs < 1dbar3355128880-8080186437-1033
Some diffs > 1dbar292338-127351035-207
80% > 1dbar2-19---482-14-85
Median Min Adjusted Profile Pressure
Med MPP < 2.5dbar418---1-15--29
Med MPP < 7.5dbar1356250472403-8272324818037433848
Med MPP < 12.55156212-44192533242
Med MPP > 12.51133161-11-125-89

Table updated on 09-Aug-2011, GDAC state as at 06-Aug-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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