check of the delayed mode corrections for the argo oats in ......check of the delayed mode...

Check of the delayed Mode corrections

for the Argo floats in the North Atlantic

C.Cabanes, V. THierry

SO ARGO - LPO report LPO/14-xx - Update October 16, 2014

Contents

1 Introduction 1

2 Salinity correction from our OW method when it differs significantlyfrom the correction available on the GDAC files 42.1 IF French floats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1.1 Float 1900076 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42.1.2 Float 1900078 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.1.3 Float 4900211 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.1.4 Float 4900215 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72.1.5 Float 4900223 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82.1.6 Float 4900225 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92.1.7 Float 6900045 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102.1.8 Float 6900166 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112.1.9 Float 6900162 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122.1.10 Float 6900176 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132.1.11 Float 6900395 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142.1.12 Float 69032 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152.1.13 Float 69039 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162.1.14 Float 69043 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.2 IF German floats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182.2.1 Float 4900350 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182.2.2 Float 4900352 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192.2.3 Float 6900160 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202.2.4 Float 6900515 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212.2.5 Float 6900560 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222.2.6 Float 6901064 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2.3 MEDS floats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242.3.1 Float 4900412 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242.3.2 Float 4900627 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252.3.3 Float 4900635 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262.3.4 Float 4900681 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272.3.5 Float 4900682 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

2.4 BODC floats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292.4.1 Float 6900614 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

1 Introduction

We have checked 578 floats processed in delayed mode (DM) in the North Atlantic, Northof 30◦N. Among the 578 floats, 392 do not show a significant salinity drift or bias accordingto the PI decision and were not corrected in DM, the other 186 floats have been corrected.

For each float, we have run a slightly modified OW method (configuration 129, see table1). Compared to the OW original method, our configuration better take into account theinterannual variability, that was shown to induce spurious corrections with the standardOW method settings. Particularly, a Gaussian decay was added with a time scale of 2 yearswhen computing the covariance matrix that is used to estimate the large scale field at thefloat profile position. Thus it is given greater weight to contemporary reference data. The

1

original OW method takes into account the temporal variability but only when the smallscale field is estimated and the large scale field is assumed to be constant. For more detailson the modified OW method, see http://www.mercator-ocean.fr/content/download/2058/15810/version/1/file/Newsletter%2350-final.pdf

For each float, we have compared the original correction made by the PI and the resultof the slightly modified OW method.We found 26 floats among 578 (see table 2) for whichthe salinity correction proposed by the PI differs significantly from our results. For thosefloats, we think it may be necessary to revise the original correction.

http://www.mercator-ocean.fr/content/download/2058/15810/version/1/file/Newsletter

OW CONFIGURATION 129

CONFIG MAX CASTS 250MAP USE PV 1MAP USE SAF 0MAPSCALE LONGITUDE LARGE 3.2MAPSCALE LONGITUDE SMALL 0.8MAPSCALE LATITUDE LARGE 2MAPSCALE LATITUDE SMALL 0.5MAPSCALE PHI LARGE 0.1MAPSCALE PHI SMALL 0.02MAPSCALE AGE 0.69MAPSCALE AGE LARGE 2MAP P EXCLUDE 500MAP P DELTA 250Reference data base CTD (2013v01)+ ARGO (2013V01)

Table 1: Parameters of the OW method, config 129 (i.e. the large scale mapping use a gaussiandecay - MAPSCALE AGE LARGE -, the calculation of the mapping error is modified andthe horizontal covariance is taken into account for the computation of the error on the fit)

2

http://www.mercator-ocean.fr/content/download/2058/15810/version/1/file/Newsletter%2350-final.pdf

http://www.mercator-ocean.fr/content/download/2058/15810/version/1/file/Newsletter%2350-final.pdf

WMO N◦ Float type Deployment date Last cycle DAC PI1900076 PROVOR CTF2 11/09/2002 15/06/2004 IF Virginie THIERRY1900078 PROVOR CTF2 15/09/2002 18/08/2004 IF Virginie THIERRY4900211 PROVOR CTF2 17/03/2002 10/12/2003 IF Virginie THIERRY4900215 PROVOR CTF2 11/05/2002 12/07/2002 IF Virginie THIERRY4900223 PROVOR CTF2 17/06/2002 17/09/2004 IF Virginie THIERRY4900225 PROVOR CTF2 18/06/2002 18/09/2004 IF Virginie THIERRY6900045 PROVOR CTF2 25/07/2001 15/07/2003 IF Virginie THIERRY6900166 APEX SBE APF7 07/05/2002 27/09/2005 IF Virginie THIERRY6900162 PROVOR CTF2 13/10/2001 21/05/2004 IF Virginie THIERRY6900176 PROVOR CTF2 26/06/2002 18/06/2004 IF Virginie THIERRY6900395 PROVOR CTS3 13/06/2006 02/09/2012 IF Virginie THIERRY69032 PROVOR CT 23/04/2000 22/06/2001 IF Christine COATANOAN69039 PROVOR CT 25/09/2000 18/02/2002 IF Christine COATANOAN69043 PROVOR CT 05/04/2001 14/01/2003 IF Christine COATANOAN4900350 APEX SBE APF7 19/09/2003 30/04/2007 IF Juergen FISCHER4900352 APEX SBE APF7 24/09/2003 08/09/2006 IF Juergen FISCHER6900160 APEX SBE APF7 02/08/2001 31/10/2003 IF Walter ZENK6900515 APEX SBE APF8 SN 05/06/2007 29/11/2013 IF Birgit KLEIN6900560 APEX APF9A F/W 27/08/2008 30/11/2013 IF Birgit KLEIN6901064 APEX-APF9A 04/07/2011 20/04/2013 IF Holger GIESE4900412 PROVOR-SBE 10/11/2003 22/06/2005 ME Howard Freeland4900627 APEX-SBE 22/10/2005 27/07/2010 ME Howard Freeland4900635 APEX-SBE 19/05/2006 09/11/2011 ME Howard Freeland4900681 APEX-SBE 23/09/2005 26/12/2010 ME Howard Freeland4900682 APEX-SBE 27/05/2006 20/06/2011 ME Howard Freeland6900614 APEX-SBE 16/05/2010 26/03/2014 BO Jon Turton

Table 2: List of the floats for which it may be necessary to revise the delayed mode correction(October 2013)

3

2 Salinity correction from our OW method when it differssignificantly from the correction available on the GDACfiles

2.1 IF French floats

2.1.1 Float 1900076

−35 −30 −25 −20 −1522

24

26

28

30

32

34

36

38

40

42

Longitude

Latit

ude

1900076 ARGO +CTD REF :ow_config_129, (Virginie THIERRY−−−IF)

10 20 30 40 50 60

−0.04

−0.03

−0.02

−0.01

0

0.01

0.02

0.03

float profile number (date of the 1 cycle: 14−Sep−2002 04:48:00)

∆ S

vertically−averaged salinity (PSS−78) additive correction ∆ S (red: configow config 129)

2 x cal error 1 x cal error 1−1 profile fit (ow config 129) Old DM correction

Figure 1: Results of the slightly modified OW method (configuration 129) for the float 1900076.Upper panel: Reference CTD and ARGO profiles used for the mapping (grey dots) areshown on the map along with the float trajectory. Lower panel: vertically-averagedmapped salinities minus float salinities on 10 θ levels (red) and the computed offset(green) from our slightly modified OW method (configuration 129).The offset previouslycomputed by the PI of the float is also shown (magenta).

4

2.1.2 Float 1900078

−40 −35 −30 −25 −20 −15 −10

24

26

28

30

32

34

36

38

40

42

44

Longitude

Latit

ude


0 10 20 30 40 50 60 70

−0.04

−0.03

−0.02

−0.01

0

0.01

0.02

0.03

0.04


∆ S



Figure 2: Results of the OW method 129 for the float 1900078. Upper panel: Reference CTD andARGO profiles used for the mapping (grey dots) are shown on the map along with thefloat trajectory. Lower panel: vertically-averaged mapped salinities minus float salinitieson 10 θ levels (red) and the computed offset (green) from our slightly modified OWmethod (configuration 129).The offset previously computed by the PI of the float is alsoshown (magenta).

5

2.1.3 Float 4900211

−50 −45 −40 −35 −30 −25

25

30

35

40

45

Longitude

Latit

ude

4900211 ARGO +CTD REF :ow_config_129, (Yves DESAUBIES−−−IF)

0 10 20 30 40 50 60

−0.03

−0.02

−0.01

0

0.01

0.02

0.03

0.04

0.05

float profile number (date of the 1 cycle: 20−Mar−2002 05:12:00)

∆ S




6

2.1.4 Float 4900215

−50 −45 −40 −35 −30

30

35

40

45

Longitude

Latit

ude


0 1 2 3 4 5 6−0.02

−0.01

0

0.01

0.02

0.03

float profile number (date of the 1 cycle: 14−May−2002 05:06:00)

∆ S



Figure 4: Results of the OW method 129 for the float 4900215.Upper panel: Reference CTD andARGO profiles used for the mapping (grey dots) are shown on the map along with thefloat trajectory. Lower panel: vertically-averaged mapped salinities minus float salinitieson 10 θ levels (red) and the computed offset (green) from our slightly modified OWmethod (configuration 129).The offset previously computed by the PI of the float is alsoshown (magenta).

7

2.1.5 Float 4900223

−60 −55 −50 −45 −40 −35 −30 −25

48

50

52

54

56

58

60

62

64

66

68

Longitude

Latit

ude


10 20 30 40 50 60 70 800.05

0.06

0.07

0.08

0.09

0.1

0.11

0.12

float profile number (date of the 1 cycle: 20−Jun−2002 05:06:00)

∆ S




8

2.1.6 Float 4900225

−55 −50 −45 −40 −35 −30 −25 −20

50

52

54

56

58

60

62

64

66

68

Longitude

Latit

ude


10 20 30 40 50 60 70 80

0.01

0.02

0.03

0.04

0.05

0.06


∆ S




9

2.1.7 Float 6900045

−30 −25 −20 −15 −10 −5

35

40

45

50

Longitude

Latit

ude


0 10 20 30 40 50 60 70

−0.1

−0.05

0

0.05

float profile number (date of the 1 cycle: 25−Jul−2001 19:14:00)

∆ S




10

2.1.8 Float 6900166

−40 −35 −30 −25 −20 −15 −10 −5

28

30

32

34

36

38

40

42

44

46

48

Longitude

Latit

ude


0 20 40 60 80 100 120

−0.1

−0.08

−0.06

−0.04

−0.02

0

0.02

0.04


∆ S



Figure 8: Results of the OW method 1292 (same as 129 but with MAP P EXCLUDE=0 insteadof 500) for the float 6900166, calibration on θ level > 12◦and < 13.5◦. Upper panel:Reference CTD and ARGO profiles used for the mapping (grey dots) are shown on themap along with the float trajectory. Lower panel: vertically-averaged mapped salinitiesminus float salinities on 10 θ levels (red) and the computed offset (green) from our slightlymodified OW method (configuration 129).The offset previously computed by the PI ofthe float is also shown (magenta).

11

2.1.9 Float 6900162

−25 −20 −15 −10 −5

35

40

45

50

55

Longitude

Latit

ude


0 10 20 30 40 50 60 70 80 90−0.1

−0.08

−0.06

−0.04

−0.02

0

0.02

0.04

float profile number (date of the 1 cycle: 23−Oct−2001 04:18:00)

∆ S




12

2.1.10 Float 6900176

−35 −30 −25 −20 −15 −10 −5

45

50

55

60

65

Longitude

Latit

ude


10 20 30 40 50 60 70

−0.1

−0.05

0

0.05


∆ S



Figure 10: Results of the OW method 129 for the float 6900176. Upper panel: Reference CTDand ARGO profiles used for the mapping (grey dots) are shown on the map along withthe float trajectory. Lower panel: vertically-averaged mapped salinities minus floatsalinities on 10 θ levels (red) and the computed offset (green) from our slightly modifiedOW method (configuration 129).The offset previously computed by the PI of the floatis also shown (magenta).

13

2.1.11 Float 6900395

−65 −60 −55 −50 −45 −40 −35 −30 −25

45

50

55

60

65

Longitude

Latit

ude


0 20 40 60 80 100 120 140

−0.1

−0.08

−0.06

−0.04

−0.02

0

0.02


∆ S



Figure 11: Results of the OW method 129 for the float 6900395. Upper panel: Reference CTDand ARGO profiles used for the mapping (grey dots) are shown on the map along withthe float trajectory. Lower panel: vertically-averaged mapped salinities minus floatsalinities on 10 θ levels (red) and the computed offset (green) from our slightly modifiedOW method (configuration 129).The offset previously computed by the PI of the floatis also shown (magenta).

14

2.1.12 Float 69032

−35 −30 −25 −20 −15 −10

30

35

40

45

50

Longitude

Latit

ude

69032 ARGO +CTD REF :ow_config_129, (Christine Coatanoan−−−IF)

5 10 15 20 25 30 35 40−0.15

−0.1

−0.05

0

0.05

0.1


∆ S



Figure 12: Results of the OW method 129 for the float 69032. Upper panel: Reference CTD andARGO profiles used for the mapping (grey dots) are shown on the map along withthe float trajectory. Lower panel: vertically-averaged mapped salinities minus floatsalinities on 10 θ levels (red) and the computed offset (green) from our slightly modifiedOW method (configuration 129).The offset previously computed by the PI of the floatis also shown (magenta).

15

2.1.13 Float 69039

−35 −30 −25 −20 −15 −10 −5

35

40

45

50

55

Longitude

Latit

ude


0 5 10 15 20 25 30 35 40 45 50

−0.25

−0.2

−0.15

−0.1

−0.05

0

0.05


∆ S



Figure 13: Results of the OW method 1292 for the float 69039, calibration on θ level > 11.5◦and <13◦. Upper panel: Reference CTD and ARGO profiles used for the mapping (grey dots)are shown on the map along with the float trajectory. Lower panel: vertically-averagedmapped salinities minus float salinities on 10 θ levels (red) and the computed offset(green) from our slightly modified OW method (configuration 129).The offset previouslycomputed by the PI of the float is also shown (magenta).

16

2.1.14 Float 69043

−25 −20 −15 −10 −5 0 5 10

35

40

45

50

55

Longitude

Latit

ude


0 10 20 30 40 50 60

−0.05

0

0.05

0.1

float profile number (date of the 1 cycle: 05−Apr−2001 21:16:00)

∆ S



Figure 14: Results of the OW method 1292 for the float 69043, calibration on θ level > 11◦and <13.5◦. Upper panel: Reference CTD and ARGO profiles used for the mapping (greydots) are shown on the map along with the float trajectory. Lower panel: vertically-averaged mapped salinities minus float salinities on 10 θ levels (red) and the computedoffset (green) from our slightly modified OW method (configuration 129).The offsetpreviously computed by the PI of the float is also shown (magenta).

17

2.2 IF German floats

2.2.1 Float 4900350

−60 −55 −50 −45 −40 −35 −30 −25

30

35

40

45

50

55

Longitude

Latit

ude

4900350 ARGO +CTD REF :ow_config_129, (Juergen FISCHER−−−IF)

0 20 40 60 80 100 120−0.04

−0.02

0

0.02

0.04

0.06

0.08


∆ S



Figure 15: Results of the OW method 129 for the float 4900350. Upper panel: Reference CTDand ARGO profiles used for the mapping (grey dots) are shown on the map along withthe float trajectory. Lower panel: vertically-averaged mapped salinities minus floatsalinities on 10 θ levels (red) and the computed offset (green) from our slightly modifiedOW method (configuration 129).The salinity corection currently available on the GDACfiles is also shown in magenta.

Our slightly modified OW method suggests that no DM correction is necessary for thisfloat.

18

2.2.2 Float 4900352

−65 −60 −55 −50 −45 −40 −35 −30 −25

30

35

40

45

50

Longitude

Latit

ude

4900352 ARGO +CTD REF :ow_config_129, (Juergen FISCHER−−−IF)

0 10 20 30 40 50 60 70 80 90 100

−0.04

−0.03

−0.02

−0.01

0

0.01

0.02

0.03


∆ S





19

2.2.3 Float 6900160

−35 −30 −25 −20 −15 −10

30

35

40

45

50

55

Longitude

Latit

ude

6900160 ARGO +CTD REF :ow_config_1292, (Walter ZENK−−−IF)

10 20 30 40 50 60 70 80

−0.03

−0.02

−0.01

0

0.01

0.02

float profile number (date of the 1 cycle: 12−Aug−2001 16:04:00)

∆ S



Figure 17: Results of the OW method 1292 for the float 6900160. The analysis is splitted atcycle 60. Upper panel: Reference CTD and ARGO profiles used for the mapping (greydots) are shown on the map along with the float trajectory. Lower panel: vertically-averaged mapped salinities minus float salinities on 10 θ levels (red) and the computedoffset (green) from our slightly modified OW method (configuration 129).The salinitycorection currently available on the GDAC files is also shown in magenta.


20

2.2.4 Float 6900515

−50 −45 −40 −35 −30 −25 −20 −15 −10

35

40

45

50

55

Longitude

Latit

ude

6900515 ARGO +CTD REF :ow_config_129, (Birgit KLEIN−−−IF)

0 20 40 60 80 100 120

−0.03

−0.02

−0.01

0

0.01


∆ S




Our slightly modified OW method suggests that a DM correction is necessary for thisfloat (around - 0.01 PSU).

21

2.2.5 Float 6900560

−60 −50 −40 −30 −20 −10

50

55

60

65

70

Longitude

Latit

ude


10 20 30 40 50 60 70 80 90

−5

0

5

10

x 10−3

float profile number (date of the 1 cycle: 27−Aug−2008 17:23:00)

∆ S


2 x cal error 1 x cal error 1−1 profile fit (ow config 129) DM correction



22

2.2.6 Float 6901064

−55 −50 −45 −40 −35 −30

40

42

44

46

48

50

52

54

56

58

60

Longitude

Latit

ude


5 10 15 20 25 30 35 40 45 50

−0.02

−0.015

−0.01

−0.005

0

float profile number (date of the 1 cycle: 20−Jul−2011 20:14:06)

∆ S




Our slightly modified OW method found a small offset (< 0.01 PSU). No DM correctionseems necessary for this float.

23

2.3 MEDS floats

2.3.1 Float 4900412

−75 −70 −65 −60 −55 −50 −45 −40

30

35

40

45

50

Longitude

Latit

ude

4900412 ARGO +CTD REF :ow_config_129, (Howard Freeland−−−ME)

5 10 15 20 25 30 35 40 45 50 55−0.03

−0.02

−0.01

0

0.01

0.02

0.03

0.04

0.05

float profile number (date of the 1 cycle: 20−Nov−2003 08:11:00)

∆ S





24

2.3.2 Float 4900627

−80 −75 −70 −65 −60 −55 −50 −45

25

30

35

40

45

Longitude

Latit

ude


0 50 100 150

−0.06

−0.05

−0.04

−0.03

−0.02

−0.01

0

0.01

0.02


∆ S




Our slightly modified OW method suggests that a DM correction is necessary for thisfloat (around - 0.02 PSU).

25

2.3.3 Float 4900635

−60 −55 −50 −45 −40 −35 −30

45

50

55

60

65

Longitude

Latit

ude


0 20 40 60 80 100 120 140 160

−0.02

−0.015

−0.01

−0.005

0

0.005

0.01


∆ S





26

2.3.4 Float 4900681

−65 −60 −55 −50 −45 −40 −35 −30 −25

25

30

35

40

45

50

55

60

65

Longitude

Latit

ude


0 20 40 60 80 100 120 140 160 180

−0.04

−0.03

−0.02

−0.01

0

0.01

0.02

0.03

0.04


∆ S





27

2.3.5 Float 4900682

−60 −55 −50 −45 −40 −35 −30

40

45

50

55

60

65

Longitude

Latit

ude


0 20 40 60 80 100 120 140 160

−25

−20

−15

−10

−5

0

5

x 10−3


∆ S





28

2.4 BODC floats

2.4.1 Float 6900614

−35 −30 −25 −20 −15 −10 −5

50

55

60

65

70

Longitude

Latit

ude

6900614 ARGO +CTD REF :ow_config_129, (Jon Turton−−−BO)

5 10 15 20 25 30 35 40 450

0.01

0.02

0.03

0.04

0.05

0.06

0.07


∆ S




Our slightly modified OW method suggests that a DM correction is necessary for thisfloat (around + 0.03 PSU).

29

check of the delayed mode corrections for the argo oats in ......check of the delayed mode...

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