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)
AOMLBODCCORIOLISCSIRONMDISJMAMEDSCSIOINCOISKMAKORDITotal all DACs
# floats423937913555171911293171172631561198610
Any DM3062297974421-81822590146114-6147
DM - missing P ADJ------113-17-31
RT - missing P ADJ109211053--4577512701464
New format tech42373781355516191123316107262156918560
SP offset deduced42373781355516191123316107262156918560
P=Praw-SP2172336705511-94228096239139875507
P type unknown29619376139371381732505
Pcor varies in prof1-3--61----11
Some Praw-Padj32223561123507597830290236139386996
Some valid SP40233601313511161087308104253139-8114
Some DAC vs Audit test32203561118507597730284236139-6944
Results of DAC vs Audit Pcor comparisons - Auto-correcting floats
All agree135224414-57-----1802
All diffs < 1dbar7----43-----50
Some diffs > 1dbar1----21-----22
80% > 1dbar------------
Results of DAC vs Audit Pcor comparisons - Correction-required floats
Prof data but no SP--4--1----3843
All agree1145238265293-754963912246-2998
All diffs < 1dbar63489397201-121106409256-1736
Some diffs > 1dbar4752513-257652237-255
80% > 1dbar--3--1462915-76
Median Min Adjusted Profile Pressure
Med MPP < 2.5dbar86522845331-159-386
Med MPP < 7.5dbar2934279796481-8722356721849355966
Med MPP < 12.514375115-7164232533432
Med MPP > 12.54765405-11-127-187

Pressure Correction [apex floats only]
AOMLBODCCORIOLISCSIRONMDISJMAMEDSCSIOINCOISKMAKORDITotal all DACs
# floats2083351627501-87428297225138935271
Any DM1331273469409-72119584140114-3736
DM - missing P ADJ------113-17-31
RT - missing P ADJ10621107--4577512701388
New format tech2083350627501-87028297224138915263
SP offset deduced2083350627501-87028297224138915263
P=Praw-SP2015334621496-86828096221130875148
P type unknown681765-621486123
Pcor varies in prof1-3--61----11
Some Praw-Padj1703332619493-86727884221130384765
Some valid SP2025334618496-86728096221130-5067
Some DAC vs Audit test1701332616493-86627884221130-4721
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--3--1----3842
All agree1025238249280-743963912137-2828
All diffs < 1dbar62989343200-113106408956-1665
Some diffs > 1dbar4752413-97651137-227
80% > 1dbar--2---462-15-65
Median Min Adjusted Profile Pressure
Med MPP < 2.5dbar6191--1-15--33
Med MPP < 7.5dbar1608260542476-8592346720349354333
Med MPP < 12.55964713-641172533247
Med MPP > 12.52865191-11-127-143

Table updated on 30-Aug-2012, GDAC state as at 28-July-2012


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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