Cruise: 18HU20130507 (dataset:GLODAPv2.2019) Data product: GLODAPv2.2019, v2.2020, v2.2021 Successor: GLODAPv2.2022, v2.2023
Synonyms (including errata!) for this cruise: 18HU20130507; alias: AR07W.2013; 18HU20130507
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)
Please wait while loading list of related files

| Filename: | Comment: | Action | |
|---|---|---|---|
| Redfield.png | View | ||

Plot/Data files re. Parameter(s) (select parameter on left side to view!):
alkalinity:10
cfc12:1
cruise:1
nitrate:12
oxygen:18
ph:5
phosphate:11
salinity:14
silicate:11
tco2:13


| Filename: | Comment: | Action | |
|---|---|---|---|
| 06MM20090714_Xover.png | [autogenerated from RC_Nico/salinity!] |
View | |
| 06MT19970707_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 06MT19990711_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 06MT20030831_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 18HU19950607_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 18HU20030713_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 18HU20060524_Xover.png | [autogenerated from RC_Nico/salinity!] |
View | |
| 18HU20070510_Xover.png | [autogenerated from RC_Nico/salinity!] |
View | |
| 18HU20080520_Xover.png | [autogenerated from RC_Nico/salinity!] |
View | |
| 18HU20090517_Xover.png | [autogenerated from RC_Nico/salinity!] |
View | |
| 18HU20110506_Xover.png | [autogenerated from RC_Nico/salinity!] |
View | |
| 316N19860424_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 74DI20080820_Xover.png | [autogenerated from RC_Nico/salinity!] |
View | |
| Xresults.png | [autogenerated from RC_Nico/salinity!] |
View | |

View comment(s) (filtered by salinity in subject)
GLODAPv3 release: autogenerated salinity update for 18HU20130507
GLODAPv3 release: salinity update of 18HU20130507 based on salinity_offset:
0.0000; inversion: 0.0000; inversion_full: -0.0016; preadjustment: 0;
offsets_raw: 0.0044; offsets_preadj: 0.0035; offsets_preadj_u: 0.0015;
offsets_post: 0.0018; offsets_post_u: 0.0010; offsets_post_rt: 0.0037;
numberofxovers: 43; trends_pre: 0.0000; trends_adj: 0.0000.
Posted by nlange@geomar.de on 2026-08-04 17:11:39 UTC for data product: GLODAPv3
18HU20130507 - salinity
Temporal trend visible towards more saline water starting in 2000;
Trend visble even below 2500m depths;
As most recent crossovers all lie within range neglect weighted mean offset
being above 0.005 - no adjustment.
Posted by nlange@geomar.de on 2018-05-07 14:57:57 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021



| Filename: | Comment: | Action | |
|---|---|---|---|
| 06MT19970707_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
View | |
| 18HU19960512_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
View | |
| 18HU20030713_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
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| 18HU20040515_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
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| 18HU20050526_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
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| 18HU20060524_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
View | |
| 18HU20070510_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
View | |
| 18HU20080520_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
View | |
| 18HU20090517_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
View | |
| 18HU20100513_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
View | |
| 18HU20110506_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
View | |
| 74DI20080820_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
View | |
| Xresults_norm.png | [autogenerated from RC_Nico/tco2!] |
View | |

View comment(s) (filtered by tco2 in subject)
GLODAPv3 release: autogenerated tco2 update for 18HU20130507
GLODAPv3 release: tco2 update of 18HU20130507 based on tco2_offset: 0.0;
inversion: 0.0; inversion_full: -0.5; preadjustment: 0; offsets_raw: 5.0;
offsets_preadj: 0.8; offsets_preadj_u: 0.3; offsets_post: 0.6; offsets_post_u:
0.2; offsets_post_rt: 4.5; numberofxovers: 27; trends_pre: 0.7; trends_adj: 0.6.
Posted by nlange@geomar.de on 2026-08-04 17:12:09 UTC for data product: GLODAPv3
18HU20130507 - tco2
A couple of profiles seems to be scattered and possibly needs to be flagged
Posted by ttanhua@geomar.de on 2018-09-26 18:01:34 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20130507 - tco2
Based on normalized tco2 (Frijs et al. 2003). Temporal trend towards higher
concentrations visible. All crossovers younger 2005 in range, however still all
offsets above 1. In line with previous (Hudson) findings. Results are confirmed
by "regular" tco2 analysis.
Posted by nlange@geomar.de on 2018-05-07 15:03:31 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021

| Filename: | Comment: | Action | |
|---|---|---|---|
| 18HU19960512_Xover_norm.png | [autogenerated from RC_Nico/alkalinity!] |
View | |
| 18HU19970509_Xover_norm.png | [autogenerated from RC_Nico/alkalinity!] |
View | |
| 18HU20010530_Xover_norm.png | [autogenerated from RC_Nico/alkalinity!] |
View | |
| 18HU20030713_Xover_norm.png | [autogenerated from RC_Nico/alkalinity!] |
View | |
| 18HU20040515_Xover_norm.png | [autogenerated from RC_Nico/alkalinity!] |
View | |
| 18HU20100513_Xover_norm.png | [autogenerated from RC_Nico/alkalinity!] |
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| 18HU20110506_Xover_norm.png | [autogenerated from RC_Nico/alkalinity!] |
View | |
| 18HU20130507___alk___06MT20030723_Xover_norm.png | View | ||
| 74DI20080820_Xover_norm.png | [autogenerated from RC_Nico/alkalinity!] |
View | |
| Xresults_norm.png | [autogenerated from RC_Nico/alkalinity!] |
View | |

View comment(s) (filtered by alkalinity in subject)
GLODAPv3 release: autogenerated alkalinity update for 18HU20130507
GLODAPv3 release: alkalinity update of 18HU20130507 based on alkalinity_offset:
2.4; inversion: 2.4; inversion_full: 2.3; preadjustment: 0; offsets_raw: -1.3;
offsets_preadj: -0.6; offsets_preadj_u: 1.2; offsets_post: -0.0; offsets_post_u:
0.5; offsets_post_rt: 0.3; numberofxovers: 19; trends_pre: -0.3; trends_adj:
0.0.
Posted by nlange@geomar.de on 2026-08-04 13:46:23 UTC for data product: GLODAPv3
18HU20130507 - alkalinity
Based on normalized alkalinity (Frijs et al. 2003). Highly variable region see
timeline of HU cruises. All but three offsets are in the accceptable range. Note
that most Hudson TA data are of mediocre quality at best. There appears to be
occasional calibration breaks between the southern shelfbreak leg and the main
Labrador Sea leg, and data are generally exceedingly noisy. Results are
confirmed by "regular" alkalinity analysis.
Posted by nlange@geomar.de on 2018-05-07 15:06:42 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021

| Filename: | Comment: | Action | |
|---|---|---|---|
| 06MT19970707_Xover_press.png | [autogenerated from RC_Nico/ph!] |
View | |
| 18HU20010530_Xover_press.png | [autogenerated from RC_Nico/ph!] |
View | |
| 18HU20080520_Xover_press.png | [autogenerated from RC_Nico/ph!] |
View | |
| 18HU20110506_Xover_press.png | [autogenerated from RC_Nico/ph!] |
View | |
| 316N19810401_Xover_press.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 18HU20130507[1-last]
GLODAPv3 release: CORRIGENDUM - converted value for phosphate_offset from
percent to factor: 1.0.
Posted by nlange@geomar.de on 2026-08-05 16:37:40 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated phosphate update for 18HU20130507
GLODAPv3 release: phosphate update of 18HU20130507 based on phosphate_offset:
0.0; inversion: 0.0; inversion_full: -0.8; preadjustment: 0; offsets_raw: 0.9;
offsets_preadj: 1.0; offsets_preadj_u: 0.5; offsets_post: 0.4; offsets_post_u:
0.2; offsets_post_rt: 0.2; numberofxovers: 26; trends_pre: 0.0; trends_adj: 0.0.
Posted by nlange@geomar.de on 2026-08-04 17:11:25 UTC for data product: GLODAPv3
18HU20130507 - ph
High scatter in the data. 1st QC issue
Posted by ttanhua@geomar.de on 2018-09-26 18:21:11 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20130507 - phosphate
All crossover offsets lie within acceptable range. The only two "outliers" HU94
& 96 show large spreads in the profiles themselves.
Further very good agreement between all Cruises. No adjustment needed.
Posted by nlange@geomar.de on 2018-05-07 15:13:32 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20130507 - ph
Very precise data used for crossovers, but a clear negative offset is visible at
all depths.
If compared to HU cruises (2009-2011) an adjsutment of 0.02 would put it on a
line with HU2011. Note that HU2004 & 2005 did not receive 2nd QC.
An additional carbon interconsistency check (type 2) however does not support a
negative offset. Assuming TA and tco2 data are correct, pH needs to be adjusted
downward (roughly -0.006) to achieve the best possible interconsitency.
Given these contrary results no adjustment suggested.
Posted by nlange@geomar.de on 2018-05-07 15:08:26 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021



| Filename: | Comment: | Action | |
|---|---|---|---|
| 06MT19941115_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| 06MT19970707_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| 06MT20030723_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| 18HU19960512_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
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| 18HU20020623_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
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| 18HU20040515_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
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| 18HU20050526_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| 18HU20090517_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| 18HU20110506_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| 316N19860424_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| 74DI20080820_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
View | |
| Xresults_press.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 18HU20130507[1-last]
GLODAPv3 release: CORRIGENDUM - converted value for nitrate_offset from percent
to factor: 1.03.
Posted by nlange@geomar.de on 2026-08-05 16:37:16 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated nitrate update for 18HU20130507
GLODAPv3 release: nitrate update of 18HU20130507 based on nitrate_offset: 3.0;
inversion: 3.0; inversion_full: 3.1; preadjustment: 0; offsets_raw: -3.2;
offsets_preadj: -2.6; offsets_preadj_u: 0.4; offsets_post: -0.0; offsets_post_u:
0.2; offsets_post_rt: -0.6; numberofxovers: 26; trends_pre: -0.1; trends_adj:
-0.1.
Posted by nlange@geomar.de on 2026-08-04 17:10:59 UTC for data product: GLODAPv3
18HU20130507 - nitrate
Seattle decided to flag nitrate data as bad based on excessive scatter
Posted by ttanhua@geomar.de on 2018-09-26 17:59:49 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20130507 - nitrate
There is a very large scatter between the inividual profiles. The majority of
the mean offsets lies outside the acceptable range, but note that all crossovers
show large standard deviations. The offsets are quite consistent over the entire
depth.
HU2011, the only cruise with an offset above 1, has probably too low values
itself following earlier QC. The proposed adjustment also "improves" the
Redfield Ratio. Make an adjustment of 1.02.
Posted by nlange@geomar.de on 2018-05-07 15:12:46 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021

| Filename: | Comment: | Action | |
|---|---|---|---|
| 06MT19941115_Xover_press.png | [autogenerated from RC_Nico/phosphate!] |
View | |
| 06MT20030723_Xover_press.png | [autogenerated from RC_Nico/phosphate!] |
View | |
| 18HU19940524_Xover_press.png | [autogenerated from RC_Nico/phosphate!] |
View | |
| 18HU19950607_Xover_press.png | [autogenerated from RC_Nico/phosphate!] |
View | |
| 18HU19960512_Xover_press.png | [autogenerated from RC_Nico/phosphate!] |
View | |
| 18HU19970509_Xover_press.png | [autogenerated from RC_Nico/phosphate!] |
View | |
| 18HU20030713_Xover_press.png | [autogenerated from RC_Nico/phosphate!] |
View | |
| 18HU20070510_Xover_press.png | [autogenerated from RC_Nico/phosphate!] |
View | |
| 18HU20080520_Xover_press.png | [autogenerated from RC_Nico/phosphate!] |
View | |
| 18HU20110506_Xover_press.png | [autogenerated from RC_Nico/phosphate!] |
View | |
| Xresults_press.png | [autogenerated from RC_Nico/phosphate!] |
View | |

View comment(s) (filtered by phosphate in subject)
GLODAPv3 release: converted value for phosphate_offset from percent to factor for 18HU20130507[1-last]
GLODAPv3 release: CORRIGENDUM - converted value for phosphate_offset from
percent to factor: 1.0.
Posted by nlange@geomar.de on 2026-08-05 16:37:40 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated phosphate update for 18HU20130507
GLODAPv3 release: phosphate update of 18HU20130507 based on phosphate_offset:
0.0; inversion: 0.0; inversion_full: -0.8; preadjustment: 0; offsets_raw: 0.9;
offsets_preadj: 1.0; offsets_preadj_u: 0.5; offsets_post: 0.4; offsets_post_u:
0.2; offsets_post_rt: 0.2; numberofxovers: 26; trends_pre: 0.0; trends_adj: 0.0.
Posted by nlange@geomar.de on 2026-08-04 17:11:25 UTC for data product: GLODAPv3
18HU20130507 - phosphate
All crossover offsets lie within acceptable range. The only two "outliers" HU94
& 96 show large spreads in the profiles themselves.
Further very good agreement between all Cruises. No adjustment needed.
Posted by nlange@geomar.de on 2018-05-07 15:13:32 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021

| Filename: | Comment: | Action | |
|---|---|---|---|
| 06MT19970707_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 06MT20030723_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 18HU19980622_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 18HU20000520_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 18HU20050526_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 18HU20070510_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 18HU20090517_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 18HU20100513_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 18HU20110506_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 74DI20080820_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
View | |
| Xresults_press.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 18HU20130507[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 18HU20130507[1-last]
GLODAPv3 release: CORRIGENDUM - silicate update of 18HU20130507[1-last] based on
silicate_offset: 0.0; inversion: 0.0; inversion_full: 0.0; preadjustment: 0;
offsets_raw: 1.9; offsets_preadj: 1.9; offsets_preadj_u: 0.4; offsets_post: 0.2;
offsets_post_u: 0.4; offsets_post_rt: 0.1; numberofxovers: 26; trends_pre: 0.0;
trends_adj: 0.0.
Posted by nlange@geomar.de on 2026-08-05 14:17:23 UTC for data product: GLODAPv3
18HU20130507 - silicate
Tricky one... Consistent high positive offsets except for the two most recent
cruises (HU2010 & HU2011). These offsets are negative, below the thershold limit
and maybe a sign of an increasing trend.
The weighted mean offset is 1.02. Nonetheless, given the (potential) temporal
trend and the high variability of this region no adjustment suggested.
Posted by nlange@geomar.de on 2018-05-07 15:16:28 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021

| Filename: | Comment: | Action | |
|---|---|---|---|
| 06MM20090714_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 06MT19941115_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 06MT19970707_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 06MT20030723_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 06MT20030831_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 18HU19920527_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 18HU19940524_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
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| 18HU19960512_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 18HU19980622_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 18HU20010530_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 18HU20020623_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 18HU20040515_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 18HU20050526_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 18HU20090517_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 18HU20110506_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 316N19860424_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| 74DI20080820_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
View | |
| Xresults_press.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 18HU20130507[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 16:37:27 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated oxygen update for 18HU20130507
GLODAPv3 release: oxygen update of 18HU20130507 based on oxygen_offset: 0.0;
inversion: 0.0; inversion_full: -0.4; preadjustment: 0; offsets_raw: 0.0;
offsets_preadj: 0.3; offsets_preadj_u: 0.1; offsets_post: 0.3; offsets_post_u:
0.1; offsets_post_rt: 0.1; numberofxovers: 40; trends_pre: -0.1; trends_adj:
-0.0.
Posted by nlange@geomar.de on 2026-08-04 17:11:11 UTC for data product: GLODAPv3
18HU20130507 - oxygen
Crossover results shown here are based on a minimum depth of 2000m. If the
minimum
depth is set to 1500m the negative offset at the upper layers becomes even more
pronounced. Note that this offset diminishes/changes sign in depth.
In general there is a large variability between the crossovers. The majority of
offsets lies within the acceptable range. No adjustment suggested.
Posted by nlange@geomar.de on 2018-05-07 15:21:32 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021



View comment(s) (filtered by cfc12 in subject)
18HU20130507 - cfc12
(Mean) Stauration ratio shows no clear offset. No adjustment suggested.
Posted by nlange@geomar.de on 2018-05-07 15:25:26 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20130507 - cfc12
Saturation ratios show no clear offset. No adjustment suggested.
Posted by nlange@geomar.de on 2018-05-07 14:57:09 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021










View 34 comment(s) (Lists all comments)
GLODAPv3 release: converted value for silicate_offset from percent to factor for 18HU20130507[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 18HU20130507[1-last]
GLODAPv3 release: CORRIGENDUM - converted value for phosphate_offset from
percent to factor: 1.0.
Posted by nlange@geomar.de on 2026-08-05 16:37:40 UTC for data product: GLODAPv3
GLODAPv3 release: converted value for oxygen_offset from percent to factor for 18HU20130507[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 16:37:27 UTC for data product: GLODAPv3
GLODAPv3 release: converted value for nitrate_offset from percent to factor for 18HU20130507[1-last]
GLODAPv3 release: CORRIGENDUM - converted value for nitrate_offset from percent
to factor: 1.03.
Posted by nlange@geomar.de on 2026-08-05 16:37:16 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated silicate update for 18HU20130507[1-last]
GLODAPv3 release: CORRIGENDUM - silicate update of 18HU20130507[1-last] based on
silicate_offset: 0.0; inversion: 0.0; inversion_full: 0.0; preadjustment: 0;
offsets_raw: 1.9; offsets_preadj: 1.9; offsets_preadj_u: 0.4; offsets_post: 0.2;
offsets_post_u: 0.4; offsets_post_rt: 0.1; numberofxovers: 26; trends_pre: 0.0;
trends_adj: 0.0.
Posted by nlange@geomar.de on 2026-08-05 14:17:23 UTC for data product: GLODAPv3
18HU20130507[1-last] GLODAPv3 release
GLODAPv3 release: silicate autogenerated adjustment parameter update for
18HU20130507 - select parameter to view annotation with specific details.
Posted by nlange@geomar.de on 2026-08-05 14:17:23 UTC for data product: GLODAPv3
GLODAPv3 release: temperature added as NEW adjustment parameter to 18HU20130507[1-last]
Automated addition of temperature as NEW parameter to 18HU20130507[1-last] based
on temperature_offset: 0.
Posted by nlange@geomar.de on 2026-08-05 14:17:10 UTC for data product: GLODAPv3
18HU20130507[1-last] GLODAPv3 release
Automated addition of temperature as NEW adjustment parameter in GLODAPv3 to
18HU20130507[1-last] - select parameter to view annotation with specific
details.
Posted by nlange@geomar.de on 2026-08-05 14:17:10 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated tco2 update for 18HU20130507
GLODAPv3 release: tco2 update of 18HU20130507 based on tco2_offset: 0.0;
inversion: 0.0; inversion_full: -0.5; preadjustment: 0; offsets_raw: 5.0;
offsets_preadj: 0.8; offsets_preadj_u: 0.3; offsets_post: 0.6; offsets_post_u:
0.2; offsets_post_rt: 4.5; numberofxovers: 27; trends_pre: 0.7; trends_adj: 0.6.
Posted by nlange@geomar.de on 2026-08-04 17:12:09 UTC for data product: GLODAPv3
18HU20130507 GLODAPv3 release
GLODAPv3 release: tco2 autogenerated adjustment parameter update for
18HU20130507 - select parameter to view annotation with specific details.
Posted by nlange@geomar.de on 2026-08-04 17:12:09 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated salinity update for 18HU20130507
GLODAPv3 release: salinity update of 18HU20130507 based on salinity_offset:
0.0000; inversion: 0.0000; inversion_full: -0.0016; preadjustment: 0;
offsets_raw: 0.0044; offsets_preadj: 0.0035; offsets_preadj_u: 0.0015;
offsets_post: 0.0018; offsets_post_u: 0.0010; offsets_post_rt: 0.0037;
numberofxovers: 43; trends_pre: 0.0000; trends_adj: 0.0000.
Posted by nlange@geomar.de on 2026-08-04 17:11:39 UTC for data product: GLODAPv3
18HU20130507 GLODAPv3 release
GLODAPv3 release: salinity autogenerated adjustment parameter update for
18HU20130507 - select parameter to view annotation with specific details.
Posted by nlange@geomar.de on 2026-08-04 17:11:39 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated phosphate update for 18HU20130507
GLODAPv3 release: phosphate update of 18HU20130507 based on phosphate_offset:
0.0; inversion: 0.0; inversion_full: -0.8; preadjustment: 0; offsets_raw: 0.9;
offsets_preadj: 1.0; offsets_preadj_u: 0.5; offsets_post: 0.4; offsets_post_u:
0.2; offsets_post_rt: 0.2; numberofxovers: 26; trends_pre: 0.0; trends_adj: 0.0.
Posted by nlange@geomar.de on 2026-08-04 17:11:25 UTC for data product: GLODAPv3
18HU20130507 GLODAPv3 release
GLODAPv3 release: phosphate autogenerated adjustment parameter update for
18HU20130507 - select parameter to view annotation with specific details.
Posted by nlange@geomar.de on 2026-08-04 17:11:25 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated oxygen update for 18HU20130507
GLODAPv3 release: oxygen update of 18HU20130507 based on oxygen_offset: 0.0;
inversion: 0.0; inversion_full: -0.4; preadjustment: 0; offsets_raw: 0.0;
offsets_preadj: 0.3; offsets_preadj_u: 0.1; offsets_post: 0.3; offsets_post_u:
0.1; offsets_post_rt: 0.1; numberofxovers: 40; trends_pre: -0.1; trends_adj:
-0.0.
Posted by nlange@geomar.de on 2026-08-04 17:11:11 UTC for data product: GLODAPv3
18HU20130507 GLODAPv3 release
GLODAPv3 release: oxygen autogenerated adjustment parameter update for
18HU20130507 - select parameter to view annotation with specific details.
Posted by nlange@geomar.de on 2026-08-04 17:11:11 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated nitrate update for 18HU20130507
GLODAPv3 release: nitrate update of 18HU20130507 based on nitrate_offset: 3.0;
inversion: 3.0; inversion_full: 3.1; preadjustment: 0; offsets_raw: -3.2;
offsets_preadj: -2.6; offsets_preadj_u: 0.4; offsets_post: -0.0; offsets_post_u:
0.2; offsets_post_rt: -0.6; numberofxovers: 26; trends_pre: -0.1; trends_adj:
-0.1.
Posted by nlange@geomar.de on 2026-08-04 17:10:59 UTC for data product: GLODAPv3
18HU20130507 GLODAPv3 release
GLODAPv3 release: nitrate autogenerated adjustment parameter update for
18HU20130507 - select parameter to view annotation with specific details.
Posted by nlange@geomar.de on 2026-08-04 17:10:59 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated alkalinity update for 18HU20130507
GLODAPv3 release: alkalinity update of 18HU20130507 based on alkalinity_offset:
2.4; inversion: 2.4; inversion_full: 2.3; preadjustment: 0; offsets_raw: -1.3;
offsets_preadj: -0.6; offsets_preadj_u: 1.2; offsets_post: -0.0; offsets_post_u:
0.5; offsets_post_rt: 0.3; numberofxovers: 19; trends_pre: -0.3; trends_adj:
0.0.
Posted by nlange@geomar.de on 2026-08-04 13:46:23 UTC for data product: GLODAPv3
18HU20130507 GLODAPv3 release
GLODAPv3 release: alkalinity autogenerated adjustment parameter update for
18HU20130507 - select parameter to view annotation with specific details.
Posted by nlange@geomar.de on 2026-08-04 13:46:23 UTC for data product: GLODAPv3
18HU20130507 - ph
High scatter in the data. 1st QC issue
Posted by ttanhua@geomar.de on 2018-09-26 18:21:11 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20130507 - tco2
A couple of profiles seems to be scattered and possibly needs to be flagged
Posted by ttanhua@geomar.de on 2018-09-26 18:01:34 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20130507 - nitrate
Seattle decided to flag nitrate data as bad based on excessive scatter
Posted by ttanhua@geomar.de on 2018-09-26 17:59:49 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20130507
The minimum depth for the crossover analyis of oxygen and salinity is set to
2000m.
Posted by nlange@geomar.de on 2018-05-07 15:26:32 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20130507 - cfc12
(Mean) Stauration ratio shows no clear offset. No adjustment suggested.
Posted by nlange@geomar.de on 2018-05-07 15:25:26 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20130507 - oxygen
Crossover results shown here are based on a minimum depth of 2000m. If the
minimum
depth is set to 1500m the negative offset at the upper layers becomes even more
pronounced. Note that this offset diminishes/changes sign in depth.
In general there is a large variability between the crossovers. The majority of
offsets lies within the acceptable range. No adjustment suggested.
Posted by nlange@geomar.de on 2018-05-07 15:21:32 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20130507 - silicate
Tricky one... Consistent high positive offsets except for the two most recent
cruises (HU2010 & HU2011). These offsets are negative, below the thershold limit
and maybe a sign of an increasing trend.
The weighted mean offset is 1.02. Nonetheless, given the (potential) temporal
trend and the high variability of this region no adjustment suggested.
Posted by nlange@geomar.de on 2018-05-07 15:16:28 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20130507 - phosphate
All crossover offsets lie within acceptable range. The only two "outliers" HU94
& 96 show large spreads in the profiles themselves.
Further very good agreement between all Cruises. No adjustment needed.
Posted by nlange@geomar.de on 2018-05-07 15:13:32 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20130507 - nitrate
There is a very large scatter between the inividual profiles. The majority of
the mean offsets lies outside the acceptable range, but note that all crossovers
show large standard deviations. The offsets are quite consistent over the entire
depth.
HU2011, the only cruise with an offset above 1, has probably too low values
itself following earlier QC. The proposed adjustment also "improves" the
Redfield Ratio. Make an adjustment of 1.02.
Posted by nlange@geomar.de on 2018-05-07 15:12:46 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20130507 - ph
Very precise data used for crossovers, but a clear negative offset is visible at
all depths.
If compared to HU cruises (2009-2011) an adjsutment of 0.02 would put it on a
line with HU2011. Note that HU2004 & 2005 did not receive 2nd QC.
An additional carbon interconsistency check (type 2) however does not support a
negative offset. Assuming TA and tco2 data are correct, pH needs to be adjusted
downward (roughly -0.006) to achieve the best possible interconsitency.
Given these contrary results no adjustment suggested.
Posted by nlange@geomar.de on 2018-05-07 15:08:26 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20130507 - alkalinity
Based on normalized alkalinity (Frijs et al. 2003). Highly variable region see
timeline of HU cruises. All but three offsets are in the accceptable range. Note
that most Hudson TA data are of mediocre quality at best. There appears to be
occasional calibration breaks between the southern shelfbreak leg and the main
Labrador Sea leg, and data are generally exceedingly noisy. Results are
confirmed by "regular" alkalinity analysis.
Posted by nlange@geomar.de on 2018-05-07 15:06:42 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20130507 - tco2
Based on normalized tco2 (Frijs et al. 2003). Temporal trend towards higher
concentrations visible. All crossovers younger 2005 in range, however still all
offsets above 1. In line with previous (Hudson) findings. Results are confirmed
by "regular" tco2 analysis.
Posted by nlange@geomar.de on 2018-05-07 15:03:31 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20130507 - salinity
Temporal trend visible towards more saline water starting in 2000;
Trend visble even below 2500m depths;
As most recent crossovers all lie within range neglect weighted mean offset
being above 0.005 - no adjustment.
Posted by nlange@geomar.de on 2018-05-07 14:57:57 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20130507 - cfc12
Saturation ratios show no clear offset. No adjustment suggested.
Posted by nlange@geomar.de on 2018-05-07 14:57:09 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
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