Cruise: 29AH20120623 (dataset:GLODAPv2.2019) Data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023 Successor: GLODAPv3
Synonyms (including errata!) for this cruise: OVIDE12; 29AH20120623; erratum:29AH20120622
IMPORTANT information for GLODAP Reference Group Editors: This adjustment version is immutable and published in GLODAPv2.2019! Click here to switch to new version (GLODAPv2.2019)
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| Filename: | Comment: | Action | |
|---|---|---|---|
| Redfield.png | View | ||
| tracer.png | View | ||

Plot/Data files re. Parameter(s) (select parameter on left side to view!):
alkalinity:11
cfc11:1
cfc12:1
cruise:2
nitrate:14
oxygen:11
ph:12
phosphate:21
phts:10
salinity:29
silicate:14



View comment(s) (filtered by salinity in subject)
GLODAPv3 release: autogenerated salinity update for 29AH20120623
GLODAPv3 release: salinity update of 29AH20120623 based on salinity_offset:
-0.0031; inversion: -0.0031; inversion_full: -0.0036; preadjustment: 0;
offsets_raw: 0.0026; offsets_preadj: 0.0027; offsets_preadj_u: 0.0005;
offsets_post: 0.0000; offsets_post_u: 0.0005; offsets_post_rt: -0.0002;
numberofxovers: 58; trends_pre: 0.0000; trends_adj: 0.0000.
Posted by nlange@geomar.de on 2026-08-04 17:11:40 UTC for data product: GLODAPv3
29AH20120623 - salinity
Merged data of bottle salinity and CTDSAL (if needed) used for analysis. Most
outliers lie near coast, however more "reliable" crossovers close to (or
slightly above) zero.
Posted by nlange@geomar.de on 2018-04-11 15:37:06 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023




View comment(s) (filtered by tco2 in subject)
GLODAPv3 release: autogenerated tco2 update for 29AH20120623
GLODAPv3 release: tco2 update of 29AH20120623 based on tco2_offset: -999.0;
inversion: NaN; inversion_full: NaN; preadjustment: NaN; offsets_raw: NaN;
offsets_preadj: NaN; offsets_preadj_u: NaN; offsets_post: NaN; offsets_post_u:
NaN; offsets_post_rt: NaN; numberofxovers: NaN; trends_pre: NaN; trends_adj:
NaN.
Posted by nlange@geomar.de on 2026-08-04 17:12:10 UTC for data product: GLODAPv3

| Filename: | Comment: | Action | |
|---|---|---|---|
| 06GA20000506_Xover.png | [autogenerated from RC_Nico/alkalinity!] |
View | |
| 06MM20060523_Xover.png | [autogenerated from RC_Nico/alkalinity!] |
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| 06MT19960613_Xover.png | [autogenerated from RC_Nico/alkalinity!] |
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| 06MT19970707_Xover.png | [autogenerated from RC_Nico/alkalinity!] |
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| 06MT20030723_Xover.png | [autogenerated from RC_Nico/alkalinity!] |
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| 29GD19840711_Xover.png | [autogenerated from RC_Nico/alkalinity!] |
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| 33MW19930704.1_Xover.png | [autogenerated from RC_Nico/alkalinity!] |
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| 33RO20030604_Xover.png | [autogenerated from RC_Nico/alkalinity!] |
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| 35TH20100608_Xover.png | [autogenerated from RC_Nico/alkalinity!] |
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| 64PE20070830_Xover.png | [autogenerated from RC_Nico/alkalinity!] |
View | |
| Xresults.png | [autogenerated from RC_Nico/alkalinity!] |
View | |

View comment(s) (filtered by alkalinity in subject)
GLODAPv3 release: autogenerated alkalinity update for 29AH20120623
GLODAPv3 release: alkalinity update of 29AH20120623 based on alkalinity_offset:
0.0; inversion: 0.0; inversion_full: -0.3; preadjustment: 0; offsets_raw: 0.6;
offsets_preadj: 0.7; offsets_preadj_u: 0.7; offsets_post: 0.4; offsets_post_u:
0.4; offsets_post_rt: 0.2; numberofxovers: 41; trends_pre: 0.0; trends_adj: 0.0.
Posted by nlange@geomar.de on 2026-08-04 13:46:24 UTC for data product: GLODAPv3
29AH20120623 - alkalinity
Many stations used for the crossover analysis are either near upwelling sites or
deep water Formation sites.
Nonethelss, most offsets are within acceptable range
Note thaht all GD cruises are "bad" crossover examples.
Maintain.
Posted by nlange@geomar.de on 2018-06-05 10:55:47 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023

| Filename: | Comment: | Action | |
|---|---|---|---|
| 06MM20060523_Xover.png | [autogenerated from RC_Nico/ph!] |
View | |
| 06MT19970707_Xover.png | [autogenerated from RC_Nico/ph!] |
View | |
| 06MT20010717_Xover.png | [autogenerated from RC_Nico/ph!] |
View | |
| 18HU20030713_Xover.png | [autogenerated from RC_Nico/ph!] |
View | |
| 316N19970530_Xover.png | [autogenerated from RC_Nico/ph!] |
View | |
| 316N19971005_Xover.png | [autogenerated from RC_Nico/ph!] |
View | |
| 33MW19930704.1_Xover.png | [autogenerated from RC_Nico/ph!] |
View | |
| 35TH20040604_Xover.png | [autogenerated from RC_Nico/ph!] |
View | |
| 64PE20070830_Xover.png | [autogenerated from RC_Nico/ph!] |
View | |
| 74DI19980423_Xover.png | [autogenerated from RC_Nico/ph!] |
View | |
| 74DI20080820_Xover.png | [autogenerated from RC_Nico/ph!] |
View | |
| Xresults.png | [autogenerated from RC_Nico/ph!] |
View | |

View comment(s) (filtered by ph in subject)
GLODAPv3 release: converted value for phosphate_offset from percent to factor for 29AH20120623[1-last]
GLODAPv3 release: CORRIGENDUM - converted value for phosphate_offset from
percent to factor: 1.043.
Posted by nlange@geomar.de on 2026-08-05 16:37:41 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated phosphate update for 29AH20120623
GLODAPv3 release: phosphate update of 29AH20120623 based on phosphate_offset:
4.3; inversion: -1.7; inversion_full: -1.9; preadjustment: 6; offsets_raw: 2.2;
offsets_preadj: 2.1; offsets_preadj_u: 0.5; offsets_post: -0.0; offsets_post_u:
0.3; offsets_post_rt: 0.2; numberofxovers: 31; trends_pre: 0.0; trends_adj: 0.0.
Posted by nlange@geomar.de on 2026-08-04 17:11:26 UTC for data product: GLODAPv3
29AH20120623 - ph
After the discussions in Seattle and the new limits for pH this cruise receives
no adjustment
Posted by siv.lauvset@uib.no on 2018-10-01 09:36:12 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023
29AH20120623 - ph
It should be take into account that some acidification is occurring in deep
water. it should be compared with more recent cruises.
Posted by fiz.perez@iim.csic.es on 2018-09-23 07:23:48 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023
29AH20120623 - ph
An additional carbon inter consistency check (type 3) shows that the proposed
adjustment enhances the accuracy. The tco2 (calculated) offset without a pH
adjustment is 4.17, with adjustment (0.004) 2.50. Note that a temporal trend is
involved in the tco2 offsets - the calculated tco2 data (with ph adjustment) is
not offset in respect to 35TH2010, the most recent crossover. Hence the
adjustment of 0.004 seems good.
Posted by nlange@geomar.de on 2018-07-27 10:23:25 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023
29AH20120623 - ph
There is only one crossovers (316N2007) with an offsets above 0. Further, note
thath extreme outliers not reliable, e.g. crossovers in the Hudson bay. Also,
deep measurements often show weaker offsets, e.g. 33MW1993.
Adjust slightly upward.
Posted by nlange@geomar.de on 2018-06-05 11:09:34 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023



| Filename: | Comment: | Action | |
|---|---|---|---|
| 06GA20000506_Xover.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| 06MM20060523_Xover.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| 06MT19970707_Xover.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| 06MT19970815_Xover.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| 18HU19950607_Xover.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| 18HU20020623_Xover.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| 32OC19880723_Xover.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| 33RO20030604_Xover.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| 35TH20100608_Xover.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| 64PE20070830_Xover.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| 64TR19910408_Xover.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| 74DI20080820_Xover.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| Xover.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| Xresults.png | [autogenerated from RC_Nico/nitrate!] |
View | |

View comment(s) (filtered by nitrate in subject)
GLODAPv3 release: converted value for nitrate_offset from percent to factor for 29AH20120623[1-last]
GLODAPv3 release: CORRIGENDUM - converted value for nitrate_offset from percent
to factor: 1.0.
Posted by nlange@geomar.de on 2026-08-05 16:37:17 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated nitrate update for 29AH20120623
GLODAPv3 release: nitrate update of 29AH20120623 based on nitrate_offset: 0.0;
inversion: 0.0; inversion_full: 0.9; preadjustment: 0; offsets_raw: -0.8;
offsets_preadj: -0.8; offsets_preadj_u: 0.3; offsets_post: -0.9; offsets_post_u:
0.1; offsets_post_rt: -0.9; numberofxovers: 36; trends_pre: 0.0; trends_adj:
0.0.
Posted by nlange@geomar.de on 2026-08-04 17:11:00 UTC for data product: GLODAPv3
29AH20120623 - nitrate
The highest negative offsets are all near coastal regions. In total 7 positive
offsets are present. Weighted mean offset clearly within range. Maintain.
Posted by nlange@geomar.de on 2018-06-05 11:11:28 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023


View comment(s) (filtered by phosphate in subject)
GLODAPv3 release: converted value for phosphate_offset from percent to factor for 29AH20120623[1-last]
GLODAPv3 release: CORRIGENDUM - converted value for phosphate_offset from
percent to factor: 1.043.
Posted by nlange@geomar.de on 2026-08-05 16:37:41 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated phosphate update for 29AH20120623
GLODAPv3 release: phosphate update of 29AH20120623 based on phosphate_offset:
4.3; inversion: -1.7; inversion_full: -1.9; preadjustment: 6; offsets_raw: 2.2;
offsets_preadj: 2.1; offsets_preadj_u: 0.5; offsets_post: -0.0; offsets_post_u:
0.3; offsets_post_rt: 0.2; numberofxovers: 31; trends_pre: 0.0; trends_adj: 0.0.
Posted by nlange@geomar.de on 2026-08-04 17:11:26 UTC for data product: GLODAPv3

| Filename: | Comment: | Action | |
|---|---|---|---|
| 06GA20000506_Xover.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 06MM20060523_Xover.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 06MT19970611_Xover.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 06MT19970815_Xover.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 06MT20030723_Xover.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 18HU19950607_Xover.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 18HU20020623_Xover.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 32OC19880723_Xover.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 33MW19930704.1_Xover.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 33RO20030604_Xover.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 35TH20100608_Xover.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 64PE20050907_Xover.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 74DI19980423_Xover.png | [autogenerated from RC_Nico/silicate!] |
View | |
| Xresults.png | [autogenerated from RC_Nico/silicate!] |
View | |

View comment(s) (filtered by silicate in subject)
GLODAPv3 release: converted value for silicate_offset from percent to factor for 29AH20120623[1-last]
GLODAPv3 release: CORRIGENDUM - converted value for silicate_offset from percent
to factor: 1.0.
Posted by nlange@geomar.de on 2026-08-05 16:37:54 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated silicate update for 29AH20120623[1-last]
GLODAPv3 release: CORRIGENDUM - silicate update of 29AH20120623[1-last] based on
silicate_offset: 0.0; inversion: 0.0; inversion_full: -0.1; preadjustment: 0;
offsets_raw: -0.4; offsets_preadj: 0.1; offsets_preadj_u: 0.8; offsets_post:
-0.0; offsets_post_u: 0.4; offsets_post_rt: 0.1; numberofxovers: 29; trends_pre:
-0.2; trends_adj: 0.0.
Posted by nlange@geomar.de on 2026-08-05 14:17:24 UTC for data product: GLODAPv3
29AH20120623 - silicate
The crossover offsets show a very large variability, whereby
no clear pattern is visible. Maintain.
Posted by nlange@geomar.de on 2018-06-05 11:18:06 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023

| Filename: | Comment: | Action | |
|---|---|---|---|
| 06GA20000506_Xover.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 06MM20060523_Xover.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 06MT19970611_Xover.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 06MT20030723_Xover.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 18HU19970509_Xover.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 32OC19880723_Xover.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 33RO20030604_Xover.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 35TH20020611_Xover.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 64PE20050907_Xover.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 74DI20110715_Xover.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| Xresults.png | [autogenerated from RC_Nico/oxygen!] |
View | |

View comment(s) (filtered by oxygen in subject)
GLODAPv3 release: converted value for oxygen_offset from percent to factor for 29AH20120623[1-last]
GLODAPv3 release: CORRIGENDUM - converted value for oxygen_offset from percent
to factor: 1.0.
Posted by nlange@geomar.de on 2026-08-05 16:37:28 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated oxygen update for 29AH20120623
GLODAPv3 release: oxygen update of 29AH20120623 based on oxygen_offset: 0.0;
inversion: 0.0; inversion_full: -0.1; preadjustment: 0; offsets_raw: -0.6;
offsets_preadj: -0.6; offsets_preadj_u: 0.1; offsets_post: -0.2; offsets_post_u:
0.1; offsets_post_rt: -0.2; numberofxovers: 55; trends_pre: 0.0; trends_adj:
0.0.
Posted by nlange@geomar.de on 2026-08-04 17:11:12 UTC for data product: GLODAPv3
29AH20120623 - oxygen
Only 4 "good" crossovers with offsets slightly above 1. Many negative offsets,
which are below 0.98 are not too reliable, e.g. close to upwelling sites.
Maintain.
Posted by nlange@geomar.de on 2018-06-05 10:57:45 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023



View comment(s) (filtered by cfc12 in subject)
29AH20120623 - cfc12
The saturation ratios show quite a bit of variability, but the total mean, as
well as the nice relation to CFC_11 indicate nice accuracy.
Posted by nlange@geomar.de on 2018-06-05 11:23:17 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023

View comment(s) (filtered by cfc11 in subject)
29AH20120623 - cfc11
The saturation ratios (upper 20m) indicate a bit too high concentrations (within
acceptable range), also reflected in the total mean.
However, note the nice relation to CFC_12 measurements at all depths. Maintain.
Posted by nlange@geomar.de on 2018-06-05 11:26:30 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023








View 32 comment(s) (Lists all comments)
GLODAPv3 release: converted value for silicate_offset from percent to factor for 29AH20120623[1-last]
GLODAPv3 release: CORRIGENDUM - converted value for silicate_offset from percent
to factor: 1.0.
Posted by nlange@geomar.de on 2026-08-05 16:37:54 UTC for data product: GLODAPv3
GLODAPv3 release: converted value for phosphate_offset from percent to factor for 29AH20120623[1-last]
GLODAPv3 release: CORRIGENDUM - converted value for phosphate_offset from
percent to factor: 1.043.
Posted by nlange@geomar.de on 2026-08-05 16:37:41 UTC for data product: GLODAPv3
GLODAPv3 release: converted value for oxygen_offset from percent to factor for 29AH20120623[1-last]
GLODAPv3 release: CORRIGENDUM - converted value for oxygen_offset from percent
to factor: 1.0.
Posted by nlange@geomar.de on 2026-08-05 16:37:28 UTC for data product: GLODAPv3
GLODAPv3 release: converted value for nitrate_offset from percent to factor for 29AH20120623[1-last]
GLODAPv3 release: CORRIGENDUM - converted value for nitrate_offset from percent
to factor: 1.0.
Posted by nlange@geomar.de on 2026-08-05 16:37:17 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated silicate update for 29AH20120623[1-last]
GLODAPv3 release: CORRIGENDUM - silicate update of 29AH20120623[1-last] based on
silicate_offset: 0.0; inversion: 0.0; inversion_full: -0.1; preadjustment: 0;
offsets_raw: -0.4; offsets_preadj: 0.1; offsets_preadj_u: 0.8; offsets_post:
-0.0; offsets_post_u: 0.4; offsets_post_rt: 0.1; numberofxovers: 29; trends_pre:
-0.2; trends_adj: 0.0.
Posted by nlange@geomar.de on 2026-08-05 14:17:24 UTC for data product: GLODAPv3
29AH20120623[1-last] GLODAPv3 release
GLODAPv3 release: silicate autogenerated adjustment parameter update for
29AH20120623 - select parameter to view annotation with specific details.
Posted by nlange@geomar.de on 2026-08-05 14:17:24 UTC for data product: GLODAPv3
GLODAPv3 release: temperature added as NEW adjustment parameter to 29AH20120623[1-last]
Automated addition of temperature as NEW parameter to 29AH20120623[1-last] based
on temperature_offset: 0.
Posted by nlange@geomar.de on 2026-08-05 14:17:11 UTC for data product: GLODAPv3
29AH20120623[1-last] GLODAPv3 release
Automated addition of temperature as NEW adjustment parameter in GLODAPv3 to
29AH20120623[1-last] - select parameter to view annotation with specific
details.
Posted by nlange@geomar.de on 2026-08-05 14:17:11 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated tco2 update for 29AH20120623
GLODAPv3 release: tco2 update of 29AH20120623 based on tco2_offset: -999.0;
inversion: NaN; inversion_full: NaN; preadjustment: NaN; offsets_raw: NaN;
offsets_preadj: NaN; offsets_preadj_u: NaN; offsets_post: NaN; offsets_post_u:
NaN; offsets_post_rt: NaN; numberofxovers: NaN; trends_pre: NaN; trends_adj:
NaN.
Posted by nlange@geomar.de on 2026-08-04 17:12:10 UTC for data product: GLODAPv3
29AH20120623 GLODAPv3 release
GLODAPv3 release: tco2 autogenerated adjustment parameter update for
29AH20120623 - select parameter to view annotation with specific details.
Posted by nlange@geomar.de on 2026-08-04 17:12:10 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated salinity update for 29AH20120623
GLODAPv3 release: salinity update of 29AH20120623 based on salinity_offset:
-0.0031; inversion: -0.0031; inversion_full: -0.0036; preadjustment: 0;
offsets_raw: 0.0026; offsets_preadj: 0.0027; offsets_preadj_u: 0.0005;
offsets_post: 0.0000; offsets_post_u: 0.0005; offsets_post_rt: -0.0002;
numberofxovers: 58; trends_pre: 0.0000; trends_adj: 0.0000.
Posted by nlange@geomar.de on 2026-08-04 17:11:40 UTC for data product: GLODAPv3
29AH20120623 GLODAPv3 release
GLODAPv3 release: salinity autogenerated adjustment parameter update for
29AH20120623 - select parameter to view annotation with specific details.
Posted by nlange@geomar.de on 2026-08-04 17:11:40 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated phosphate update for 29AH20120623
GLODAPv3 release: phosphate update of 29AH20120623 based on phosphate_offset:
4.3; inversion: -1.7; inversion_full: -1.9; preadjustment: 6; offsets_raw: 2.2;
offsets_preadj: 2.1; offsets_preadj_u: 0.5; offsets_post: -0.0; offsets_post_u:
0.3; offsets_post_rt: 0.2; numberofxovers: 31; trends_pre: 0.0; trends_adj: 0.0.
Posted by nlange@geomar.de on 2026-08-04 17:11:26 UTC for data product: GLODAPv3
29AH20120623 GLODAPv3 release
GLODAPv3 release: phosphate autogenerated adjustment parameter update for
29AH20120623 - select parameter to view annotation with specific details.
Posted by nlange@geomar.de on 2026-08-04 17:11:26 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated oxygen update for 29AH20120623
GLODAPv3 release: oxygen update of 29AH20120623 based on oxygen_offset: 0.0;
inversion: 0.0; inversion_full: -0.1; preadjustment: 0; offsets_raw: -0.6;
offsets_preadj: -0.6; offsets_preadj_u: 0.1; offsets_post: -0.2; offsets_post_u:
0.1; offsets_post_rt: -0.2; numberofxovers: 55; trends_pre: 0.0; trends_adj:
0.0.
Posted by nlange@geomar.de on 2026-08-04 17:11:12 UTC for data product: GLODAPv3
29AH20120623 GLODAPv3 release
GLODAPv3 release: oxygen autogenerated adjustment parameter update for
29AH20120623 - select parameter to view annotation with specific details.
Posted by nlange@geomar.de on 2026-08-04 17:11:12 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated nitrate update for 29AH20120623
GLODAPv3 release: nitrate update of 29AH20120623 based on nitrate_offset: 0.0;
inversion: 0.0; inversion_full: 0.9; preadjustment: 0; offsets_raw: -0.8;
offsets_preadj: -0.8; offsets_preadj_u: 0.3; offsets_post: -0.9; offsets_post_u:
0.1; offsets_post_rt: -0.9; numberofxovers: 36; trends_pre: 0.0; trends_adj:
0.0.
Posted by nlange@geomar.de on 2026-08-04 17:11:00 UTC for data product: GLODAPv3
29AH20120623 GLODAPv3 release
GLODAPv3 release: nitrate autogenerated adjustment parameter update for
29AH20120623 - select parameter to view annotation with specific details.
Posted by nlange@geomar.de on 2026-08-04 17:11:00 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated alkalinity update for 29AH20120623
GLODAPv3 release: alkalinity update of 29AH20120623 based on alkalinity_offset:
0.0; inversion: 0.0; inversion_full: -0.3; preadjustment: 0; offsets_raw: 0.6;
offsets_preadj: 0.7; offsets_preadj_u: 0.7; offsets_post: 0.4; offsets_post_u:
0.4; offsets_post_rt: 0.2; numberofxovers: 41; trends_pre: 0.0; trends_adj: 0.0.
Posted by nlange@geomar.de on 2026-08-04 13:46:24 UTC for data product: GLODAPv3
29AH20120623 GLODAPv3 release
GLODAPv3 release: alkalinity autogenerated adjustment parameter update for
29AH20120623 - select parameter to view annotation with specific details.
Posted by nlange@geomar.de on 2026-08-04 13:46:24 UTC for data product: GLODAPv3
29AH20120623 - ph
After the discussions in Seattle and the new limits for pH this cruise receives
no adjustment
Posted by siv.lauvset@uib.no on 2018-10-01 09:36:12 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023
29AH20120623 - ph
It should be take into account that some acidification is occurring in deep
water. it should be compared with more recent cruises.
Posted by fiz.perez@iim.csic.es on 2018-09-23 07:23:48 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023
29AH20120623 - ph
An additional carbon inter consistency check (type 3) shows that the proposed
adjustment enhances the accuracy. The tco2 (calculated) offset without a pH
adjustment is 4.17, with adjustment (0.004) 2.50. Note that a temporal trend is
involved in the tco2 offsets - the calculated tco2 data (with ph adjustment) is
not offset in respect to 35TH2010, the most recent crossover. Hence the
adjustment of 0.004 seems good.
Posted by nlange@geomar.de on 2018-07-27 10:23:25 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023
29AH20120623 - cfc11
The saturation ratios (upper 20m) indicate a bit too high concentrations (within
acceptable range), also reflected in the total mean.
However, note the nice relation to CFC_12 measurements at all depths. Maintain.
Posted by nlange@geomar.de on 2018-06-05 11:26:30 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023
29AH20120623 - cfc12
The saturation ratios show quite a bit of variability, but the total mean, as
well as the nice relation to CFC_11 indicate nice accuracy.
Posted by nlange@geomar.de on 2018-06-05 11:23:17 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023
29AH20120623 - silicate
The crossover offsets show a very large variability, whereby
no clear pattern is visible. Maintain.
Posted by nlange@geomar.de on 2018-06-05 11:18:06 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023
29AH20120623 - nitrate
The highest negative offsets are all near coastal regions. In total 7 positive
offsets are present. Weighted mean offset clearly within range. Maintain.
Posted by nlange@geomar.de on 2018-06-05 11:11:28 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023
29AH20120623 - ph
There is only one crossovers (316N2007) with an offsets above 0. Further, note
thath extreme outliers not reliable, e.g. crossovers in the Hudson bay. Also,
deep measurements often show weaker offsets, e.g. 33MW1993.
Adjust slightly upward.
Posted by nlange@geomar.de on 2018-06-05 11:09:34 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023
29AH20120623 - oxygen
Only 4 "good" crossovers with offsets slightly above 1. Many negative offsets,
which are below 0.98 are not too reliable, e.g. close to upwelling sites.
Maintain.
Posted by nlange@geomar.de on 2018-06-05 10:57:45 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023
29AH20120623 - alkalinity
Many stations used for the crossover analysis are either near upwelling sites or
deep water Formation sites.
Nonethelss, most offsets are within acceptable range
Note thaht all GD cruises are "bad" crossover examples.
Maintain.
Posted by nlange@geomar.de on 2018-06-05 10:55:47 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023
29AH20120623 - salinity
Merged data of bottle salinity and CTDSAL (if needed) used for analysis. Most
outliers lie near coast, however more "reliable" crossovers close to (or
slightly above) zero.
Posted by nlange@geomar.de on 2018-04-11 15:37:06 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023
29AH20120623 - general
Analysis perfomed on density levels, with 1500m minimum depth. Many crossovers
lie close to Greenland or Portugal, i.e. offsets might be influenced by either
ice/deep water formation or upwelling.
Posted by nlange@geomar.de on 2018-04-11 15:18:59 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021, v2.2022, v2.2023
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