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
# floats36003261189375350974300701941421107630
Any DM2591276751278-7562044114698-5141
DM - missing P ADJ22117---411-18-181
RT - missing P ADJ2171963595-661014633-2850
New format tech359632511873743509672995919314247496
SP offset deduced34563081036369-94829158187116-6769
P=Praw-SP2534303799369-83626358187116-5465
P type unknown4121-71111-106134
Pcor varies in prof1-1--610----18
Some Praw-Padj2629301890365-91128541187116-5725
Some valid SP34323081032369-93829158187116-6731
Some DAC vs Audit test2626301832365-89828435187116-5644
Results of DAC vs Audit Pcor comparisons - Auto-correcting floats
All agree756589--722----879
All diffs < 1dbar2----431----46
Some diffs > 1dbar11----25-----36
80% > 1dbar3----1-----4
Results of DAC vs Audit Pcor comparisons - Correction-required floats
Prof data but no SP1-2--7-----10
All agree1309232317295-7251081611244-3158
All diffs < 1dbar4885733356-7382155537-1196
Some diffs > 1dbar6079314-257142035-329
80% > 1dbar2137---493914-115
Median Min Adjusted Profile Pressure
Med MPP < 2.5dbar252167--281-14--237
Med MPP < 7.5dbar2431268628348-8122173317037-4944
Med MPP < 12.51275639-69658253-401
Med MPP > 12.52926265-11--25-113


Pressure Correction [apex floats only]
AOMLBODCCORIOLISCSIROGTSJMAMEDSCSIOINCOISKMAKORDITotal all DACs
# floats1767300532362-81426560176133744483
Any DM1134252365266-6621843514098-3136
DM - missing P ADJ-2101---151-18-137
RT - missing P ADJ128593215-9894533-1553
New format tech1766299531362-8092655917513314400
SP offset deduced1723284502357-80726358172116-4282
P=Praw-SP1711284502357-80726358172116-4270
P type unknown111--5-11-7383
Pcor varies in prof--1--510----16
Some Praw-Padj1384277504354-80726135172116-3910
Some valid SP1723284498357-79926358172116-4270
Some DAC vs Audit test1382277494354-79926135172116-3890
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-----9
All agree840226192285-7191081611144-2541
All diffs < 1dbar4865027055-6882155237-1115
Some diffs > 1dbar5613214-12714935-234
80% > 1dbar2-20---493-14-88
Median Min Adjusted Profile Pressure
Med MPP < 2.5dbar4114---1-14--34
Med MPP < 7.5dbar1322248415343-8012163315537-3570
Med MPP < 12.5434627-4422253-219
Med MPP > 12.51024101-11--25-72

Table updated on 19-Jan-2011, GDAC state as at 15-Jan-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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