Cruise: 18HU20150504 (dataset:GLODAPv2.2019) Data product: GLODAPv2.2019, v2.2020, v2.2021 Successor: GLODAPv2.2022, v2.2023
Synonyms (including errata!) for this cruise: 201500; 18HU20150504; alias: AR07W.2015; 18HU20150504; 201500
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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Plot/Data files re. Parameter(s) (select parameter on left side to view!):
alkalinity:11
cfc12:1
nitrate:15
oxygen:13
phosphate:10
salinity:24
silicate:12
tco2:10


| Filename: | Comment: | Action | |
|---|---|---|---|
| 06MM20090714_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 06MT19941115_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 06MT19970707_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 06MT19990711_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 06MT20030723_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 06MT20030831_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 18HU19920527_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 18HU19940524_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 18HU19950607_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 18HU19960512_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 18HU19970509_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 18HU19980622_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 18HU20000520_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 18HU20020623_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 18HU20030713_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 18HU20040515_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 18HU20050526_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 18HU20070510_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 18HU20080520_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 18HU20090517_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 18HU20100513_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 18HU20110506_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| 74DI20080820_Xover.png | [autogenerated from RC_Nico/salinity!] |
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| Xresults.png | [autogenerated from RC_Nico/salinity!] |
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View comment(s) (filtered by salinity in subject)
GLODAPv3 release: autogenerated salinity update for 18HU20150504
GLODAPv3 release: salinity update of 18HU20150504 based on salinity_offset:
0.0000; inversion: 0.0000; inversion_full: -0.0010; preadjustment: 0;
offsets_raw: 0.0083; offsets_preadj: 0.0036; offsets_preadj_u: 0.0013;
offsets_post: 0.0011; offsets_post_u: 0.0009; offsets_post_rt: 0.0049;
numberofxovers: 41; trends_pre: 0.0008; trends_adj: 0.0005.
Posted by nlange@geomar.de on 2026-08-04 17:11:39 UTC for data product: GLODAPv3
18HU20150504 - salinity
Fits ok to MM2009 - supposed to be spot on. Hence, no adjustment suggested due
to the large uncertainty whether the increasing trend is still present (how
strong). Maybe too high though...
Posted by nlange@geomar.de on 2018-05-25 09:30:37 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021



| Filename: | Comment: | Action | |
|---|---|---|---|
| 06MT19970707_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
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| 18HU19950607_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
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| 18HU20060524_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
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| 18HU20070510_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
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| 18HU20080520_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
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| 18HU20090517_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
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| 18HU20100513_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
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| 18HU20110506_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
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| 74DI20080820_Xover_norm.png | [autogenerated from RC_Nico/tco2!] |
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| Xresults_norm.png | [autogenerated from RC_Nico/tco2!] |
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View comment(s) (filtered by tco2 in subject)
GLODAPv3 release: autogenerated tco2 update for 18HU20150504
GLODAPv3 release: tco2 update of 18HU20150504 based on tco2_offset: 0.0;
inversion: 0.0; inversion_full: -0.4; preadjustment: 0; offsets_raw: 6.2;
offsets_preadj: 0.7; offsets_preadj_u: 0.3; offsets_post: 0.5; offsets_post_u:
0.2; offsets_post_rt: 5.9; numberofxovers: 27; trends_pre: 0.6; trends_adj: 0.6.
Posted by nlange@geomar.de on 2026-08-04 17:12:09 UTC for data product: GLODAPv3
18HU20150504 - tco2
Analysis is done for normalized tco2 (Frijs et al. 2003). Temporal trend towards
higher concentrations visible. All crossovers are above the acceptable range.
Trend in line with previous findings. Given the trend, the data might just fall
nicely on it's line. No adjustment needed.
Posted by nlange@geomar.de on 2018-05-25 09:27:24 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021

| Filename: | Comment: | Action | |
|---|---|---|---|
| 06MT19970707_Xover_norm.png | [autogenerated from RC_Nico/alkalinity!] |
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| 06MT20030723_Xover_norm.png | [autogenerated from RC_Nico/alkalinity!] |
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| 18HU20010530_Xover_norm.png | [autogenerated from RC_Nico/alkalinity!] |
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| 18HU20030713_Xover_norm.png | [autogenerated from RC_Nico/alkalinity!] |
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| 18HU20040515_Xover_norm.png | [autogenerated from RC_Nico/alkalinity!] |
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| 18HU20080520_Xover_norm.png | [autogenerated from RC_Nico/alkalinity!] |
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| 18HU20090517_Xover_norm.png | [autogenerated from RC_Nico/alkalinity!] |
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| 18HU20100513_Xover_norm.png | [autogenerated from RC_Nico/alkalinity!] |
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| 18HU20110506_Xover_norm.png | [autogenerated from RC_Nico/alkalinity!] |
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| 74DI20080820_Xover_norm.png | [autogenerated from RC_Nico/alkalinity!] |
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| Xresults_norm.png | [autogenerated from RC_Nico/alkalinity!] |
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View comment(s) (filtered by alkalinity in subject)
GLODAPv3 release: autogenerated alkalinity update for 18HU20150504
GLODAPv3 release: alkalinity update of 18HU20150504 based on alkalinity_offset:
0.0; inversion: 0.0; inversion_full: -0.3; preadjustment: 0; offsets_raw: 2.1;
offsets_preadj: 2.0; offsets_preadj_u: 1.3; offsets_post: 0.2; offsets_post_u:
0.4; offsets_post_rt: 0.4; numberofxovers: 19; trends_pre: 0.0; trends_adj: 0.0.
Posted by nlange@geomar.de on 2026-08-04 13:46:23 UTC for data product: GLODAPv3
18HU20150504 - alkalinity
Analysis is done for normalized alkalinity (Frijs et al. 2003). There is a quite
good agreement with the most recent cruises. Note the slight trend towards lower
concentrations from 2004 to 2010. However, very noisy data in general...
Results are supported by an internal consistency analysis with all the carbonate
systems for HU2013, HU2014 and HU2015 data (done by Lorenza Raimondi). No
adjustment suggested.
Posted by nlange@geomar.de on 2018-05-25 09:35:38 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021


View comment(s) (filtered by ph in subject)
GLODAPv3 release: converted value for phosphate_offset from percent to factor for 18HU20150504[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 18HU20150504
GLODAPv3 release: phosphate update of 18HU20150504 based on phosphate_offset:
0.0; inversion: 0.0; inversion_full: -0.1; preadjustment: 0; offsets_raw: 0.1;
offsets_preadj: 0.2; offsets_preadj_u: 0.5; offsets_post: -0.4; offsets_post_u:
0.4; offsets_post_rt: -0.7; numberofxovers: 23; 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
18HU20150504 - ph
Scattered data, flag -888
Posted by ttanhua@geomar.de on 2018-09-26 18:40:56 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20150504 - ph
Please Nico, can you add some figures with xovers.
Posted by fiz.perez@iim.csic.es on 2018-09-21 20:50:12 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20150504 - phosphate
All crossovers, except HU1996, have offsets very close to 1.
HU1996 itself has not received a 2nd QC for this parameter. No adjustment needed
- very accurate.
Posted by nlange@geomar.de on 2018-08-07 09:39:01 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20150504 - ph
There is a large variability between the different crossover results. The mean
weighted offset is slightly below the lower limit. However, given the ok fit to
the most recent cruises (also present on density surfaces) "neglect" weighted
mean offset.
Further, just as for the other HU cruises the interconsistecny check (type 2)
and the crossover reusults do not agree... Assuming the TA and tco2 data are
accurate, pH data is offset by 0.0123 +/- 0.0202 (note the large standard
deviation). Again, given the large uncertainty do not adjust...
Posted by nlange@geomar.de on 2018-05-25 09:58:22 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021



| Filename: | Comment: | Action | |
|---|---|---|---|
| 06MT19970707_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
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| 06MT19990711_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
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| 06MT20030723_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
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| 18HU19930617_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
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| 18HU19970509_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!] |
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| 18HU20060524_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
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| 18HU20070510_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
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| 18HU20080520_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
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| 18HU20100513_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
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| 18HU20110506_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
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| 74DI20080820_Xover_press.png | [autogenerated from RC_Nico/nitrate!] |
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| Xresults_press.png | [autogenerated from RC_Nico/nitrate!] |
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View comment(s) (filtered by nitrate in subject)
GLODAPv3 release: converted value for nitrate_offset from percent to factor for 18HU20150504[1-last]
GLODAPv3 release: CORRIGENDUM - converted value for nitrate_offset from percent
to factor: 1.027.
Posted by nlange@geomar.de on 2026-08-05 16:37:16 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated nitrate update for 18HU20150504
GLODAPv3 release: nitrate update of 18HU20150504 based on nitrate_offset: 2.7;
inversion: 2.7; inversion_full: 3.4; preadjustment: 0; offsets_raw: -3.2;
offsets_preadj: -2.3; offsets_preadj_u: 0.5; offsets_post: -0.0; offsets_post_u:
0.5; offsets_post_rt: -2.0; numberofxovers: 26; trends_pre: 0.0; trends_adj:
0.0.
Posted by nlange@geomar.de on 2026-08-04 17:10:59 UTC for data product: GLODAPv3
18HU20150504 - nitrate
All offsets are below one. Further, except for one, all offsets are below the
limit. Note that there seems to be a better fit with the data of the second leg
in front of Canada. Adjust 3% upward (upper limit of weighted mean).
Posted by nlange@geomar.de on 2018-05-25 09:49:05 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021

| Filename: | Comment: | Action | |
|---|---|---|---|
| 06MT20030723_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!] |
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| 18HU19970509_Xover_press.png | [autogenerated from RC_Nico/phosphate!] |
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| 18HU20000520_Xover_press.png | [autogenerated from RC_Nico/phosphate!] |
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| 18HU20040515_Xover_press.png | [autogenerated from RC_Nico/phosphate!] |
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| 18HU20070510_Xover_press.png | [autogenerated from RC_Nico/phosphate!] |
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| 18HU20100513_Xover_press.png | [autogenerated from RC_Nico/phosphate!] |
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| 18HU20110506_Xover_press.png | [autogenerated from RC_Nico/phosphate!] |
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| Xresults_press.png | [autogenerated from RC_Nico/phosphate!] |
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View comment(s) (filtered by phosphate in subject)
GLODAPv3 release: converted value for phosphate_offset from percent to factor for 18HU20150504[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 18HU20150504
GLODAPv3 release: phosphate update of 18HU20150504 based on phosphate_offset:
0.0; inversion: 0.0; inversion_full: -0.1; preadjustment: 0; offsets_raw: 0.1;
offsets_preadj: 0.2; offsets_preadj_u: 0.5; offsets_post: -0.4; offsets_post_u:
0.4; offsets_post_rt: -0.7; numberofxovers: 23; 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
18HU20150504 - phosphate
All crossovers, except HU1996, have offsets very close to 1.
HU1996 itself has not received a 2nd QC for this parameter. No adjustment needed
- very accurate.
Posted by nlange@geomar.de on 2018-08-07 09:39:01 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021

| Filename: | Comment: | Action | |
|---|---|---|---|
| 06MT19970707_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
View | |
| 06MT19990711_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
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| 06MT20030723_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
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| 18HU19970509_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
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| 18HU20010530_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
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| 18HU20040515_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
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| 18HU20060524_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
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| 18HU20070510_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
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| 18HU20100513_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
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| 18HU20110506_Xover_press.png | [autogenerated from RC_Nico/silicate!] |
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| 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 18HU20150504[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 18HU20150504[1-last]
GLODAPv3 release: CORRIGENDUM - silicate update of 18HU20150504[1-last] based on
silicate_offset: 0.0; inversion: 0.0; inversion_full: 0.1; preadjustment: 0;
offsets_raw: 1.5; offsets_preadj: 1.5; offsets_preadj_u: 0.4; offsets_post: 0.2;
offsets_post_u: 0.3; offsets_post_rt: 0.1; numberofxovers: 24; 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
18HU20150504 - silicate
Almost all crossovers have offsets clearly within the acceptable range. Note the
large std. of all offsets. Maintain.
Posted by nlange@geomar.de on 2018-05-25 09:52:35 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021

| Filename: | Comment: | Action | |
|---|---|---|---|
| 06MM20090714_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 | |
| 18HU19960512_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
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| 18HU20010530_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
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| 18HU20030713_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
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| 18HU20040515_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
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| 18HU20050526_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
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| 18HU20060524_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
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| 18HU20080520_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
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| 18HU20110506_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
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| 74DI20080820_Xover_press.png | [autogenerated from RC_Nico/oxygen!] |
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| 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 18HU20150504[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 18HU20150504
GLODAPv3 release: oxygen update of 18HU20150504 based on oxygen_offset: 0.0;
inversion: 0.0; inversion_full: 0.4; preadjustment: 0; offsets_raw: -0.6;
offsets_preadj: -0.4; offsets_preadj_u: 0.1; offsets_post: -0.4; offsets_post_u:
0.1; offsets_post_rt: -0.6; numberofxovers: 41; trends_pre: -0.0; trends_adj:
-0.0.
Posted by nlange@geomar.de on 2026-08-04 17:11:11 UTC for data product: GLODAPv3
18HU20150504 - oxygen
Good - ok agreement with recent (younger 2006) crossovers. Thus, there seems to
be a trend towards less oxygen rich water. Note that some other cruises have
very scattery data, e.g. HU1996. Given the temporal trend, neglect weighted mean
offset and maintain.
Posted by nlange@geomar.de on 2018-05-25 09:45:59 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021



View comment(s) (filtered by cfc12 in subject)
18HU20150504 - cfc12
All saturation ratios (upper 20m) show strong undersaturation - cause of strong
water formation?
Posted by nlange@geomar.de on 2018-05-25 09:59:07 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021










View 31 comment(s) (Lists all comments)
GLODAPv3 release: converted value for silicate_offset from percent to factor for 18HU20150504[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 18HU20150504[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 18HU20150504[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 18HU20150504[1-last]
GLODAPv3 release: CORRIGENDUM - converted value for nitrate_offset from percent
to factor: 1.027.
Posted by nlange@geomar.de on 2026-08-05 16:37:16 UTC for data product: GLODAPv3
GLODAPv3 release: autogenerated silicate update for 18HU20150504[1-last]
GLODAPv3 release: CORRIGENDUM - silicate update of 18HU20150504[1-last] based on
silicate_offset: 0.0; inversion: 0.0; inversion_full: 0.1; preadjustment: 0;
offsets_raw: 1.5; offsets_preadj: 1.5; offsets_preadj_u: 0.4; offsets_post: 0.2;
offsets_post_u: 0.3; offsets_post_rt: 0.1; numberofxovers: 24; 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
18HU20150504[1-last] GLODAPv3 release
GLODAPv3 release: silicate autogenerated adjustment parameter update for
18HU20150504 - 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 18HU20150504[1-last]
Automated addition of temperature as NEW parameter to 18HU20150504[1-last] based
on temperature_offset: 0.
Posted by nlange@geomar.de on 2026-08-05 14:17:10 UTC for data product: GLODAPv3
18HU20150504[1-last] GLODAPv3 release
Automated addition of temperature as NEW adjustment parameter in GLODAPv3 to
18HU20150504[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 18HU20150504
GLODAPv3 release: tco2 update of 18HU20150504 based on tco2_offset: 0.0;
inversion: 0.0; inversion_full: -0.4; preadjustment: 0; offsets_raw: 6.2;
offsets_preadj: 0.7; offsets_preadj_u: 0.3; offsets_post: 0.5; offsets_post_u:
0.2; offsets_post_rt: 5.9; numberofxovers: 27; trends_pre: 0.6; trends_adj: 0.6.
Posted by nlange@geomar.de on 2026-08-04 17:12:09 UTC for data product: GLODAPv3
18HU20150504 GLODAPv3 release
GLODAPv3 release: tco2 autogenerated adjustment parameter update for
18HU20150504 - 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 18HU20150504
GLODAPv3 release: salinity update of 18HU20150504 based on salinity_offset:
0.0000; inversion: 0.0000; inversion_full: -0.0010; preadjustment: 0;
offsets_raw: 0.0083; offsets_preadj: 0.0036; offsets_preadj_u: 0.0013;
offsets_post: 0.0011; offsets_post_u: 0.0009; offsets_post_rt: 0.0049;
numberofxovers: 41; trends_pre: 0.0008; trends_adj: 0.0005.
Posted by nlange@geomar.de on 2026-08-04 17:11:39 UTC for data product: GLODAPv3
18HU20150504 GLODAPv3 release
GLODAPv3 release: salinity autogenerated adjustment parameter update for
18HU20150504 - 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 18HU20150504
GLODAPv3 release: phosphate update of 18HU20150504 based on phosphate_offset:
0.0; inversion: 0.0; inversion_full: -0.1; preadjustment: 0; offsets_raw: 0.1;
offsets_preadj: 0.2; offsets_preadj_u: 0.5; offsets_post: -0.4; offsets_post_u:
0.4; offsets_post_rt: -0.7; numberofxovers: 23; 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
18HU20150504 GLODAPv3 release
GLODAPv3 release: phosphate autogenerated adjustment parameter update for
18HU20150504 - 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 18HU20150504
GLODAPv3 release: oxygen update of 18HU20150504 based on oxygen_offset: 0.0;
inversion: 0.0; inversion_full: 0.4; preadjustment: 0; offsets_raw: -0.6;
offsets_preadj: -0.4; offsets_preadj_u: 0.1; offsets_post: -0.4; offsets_post_u:
0.1; offsets_post_rt: -0.6; numberofxovers: 41; trends_pre: -0.0; trends_adj:
-0.0.
Posted by nlange@geomar.de on 2026-08-04 17:11:11 UTC for data product: GLODAPv3
18HU20150504 GLODAPv3 release
GLODAPv3 release: oxygen autogenerated adjustment parameter update for
18HU20150504 - 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 18HU20150504
GLODAPv3 release: nitrate update of 18HU20150504 based on nitrate_offset: 2.7;
inversion: 2.7; inversion_full: 3.4; preadjustment: 0; offsets_raw: -3.2;
offsets_preadj: -2.3; offsets_preadj_u: 0.5; offsets_post: -0.0; offsets_post_u:
0.5; offsets_post_rt: -2.0; numberofxovers: 26; trends_pre: 0.0; trends_adj:
0.0.
Posted by nlange@geomar.de on 2026-08-04 17:10:59 UTC for data product: GLODAPv3
18HU20150504 GLODAPv3 release
GLODAPv3 release: nitrate autogenerated adjustment parameter update for
18HU20150504 - 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 18HU20150504
GLODAPv3 release: alkalinity update of 18HU20150504 based on alkalinity_offset:
0.0; inversion: 0.0; inversion_full: -0.3; preadjustment: 0; offsets_raw: 2.1;
offsets_preadj: 2.0; offsets_preadj_u: 1.3; offsets_post: 0.2; offsets_post_u:
0.4; offsets_post_rt: 0.4; numberofxovers: 19; trends_pre: 0.0; trends_adj: 0.0.
Posted by nlange@geomar.de on 2026-08-04 13:46:23 UTC for data product: GLODAPv3
18HU20150504 GLODAPv3 release
GLODAPv3 release: alkalinity autogenerated adjustment parameter update for
18HU20150504 - 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
18HU20150504 - ph
Scattered data, flag -888
Posted by ttanhua@geomar.de on 2018-09-26 18:40:56 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20150504 - ph
Please Nico, can you add some figures with xovers.
Posted by fiz.perez@iim.csic.es on 2018-09-21 20:50:12 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20150504 - phosphate
All crossovers, except HU1996, have offsets very close to 1.
HU1996 itself has not received a 2nd QC for this parameter. No adjustment needed
- very accurate.
Posted by nlange@geomar.de on 2018-08-07 09:39:01 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20150504 - cfc12
All saturation ratios (upper 20m) show strong undersaturation - cause of strong
water formation?
Posted by nlange@geomar.de on 2018-05-25 09:59:07 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20150504 - ph
There is a large variability between the different crossover results. The mean
weighted offset is slightly below the lower limit. However, given the ok fit to
the most recent cruises (also present on density surfaces) "neglect" weighted
mean offset.
Further, just as for the other HU cruises the interconsistecny check (type 2)
and the crossover reusults do not agree... Assuming the TA and tco2 data are
accurate, pH data is offset by 0.0123 +/- 0.0202 (note the large standard
deviation). Again, given the large uncertainty do not adjust...
Posted by nlange@geomar.de on 2018-05-25 09:58:22 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20150504 - silicate
Almost all crossovers have offsets clearly within the acceptable range. Note the
large std. of all offsets. Maintain.
Posted by nlange@geomar.de on 2018-05-25 09:52:35 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20150504 - nitrate
All offsets are below one. Further, except for one, all offsets are below the
limit. Note that there seems to be a better fit with the data of the second leg
in front of Canada. Adjust 3% upward (upper limit of weighted mean).
Posted by nlange@geomar.de on 2018-05-25 09:49:05 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20150504 - oxygen
Good - ok agreement with recent (younger 2006) crossovers. Thus, there seems to
be a trend towards less oxygen rich water. Note that some other cruises have
very scattery data, e.g. HU1996. Given the temporal trend, neglect weighted mean
offset and maintain.
Posted by nlange@geomar.de on 2018-05-25 09:45:59 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20150504 - alkalinity
Analysis is done for normalized alkalinity (Frijs et al. 2003). There is a quite
good agreement with the most recent cruises. Note the slight trend towards lower
concentrations from 2004 to 2010. However, very noisy data in general...
Results are supported by an internal consistency analysis with all the carbonate
systems for HU2013, HU2014 and HU2015 data (done by Lorenza Raimondi). No
adjustment suggested.
Posted by nlange@geomar.de on 2018-05-25 09:35:38 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20150504 - salinity
Fits ok to MM2009 - supposed to be spot on. Hence, no adjustment suggested due
to the large uncertainty whether the increasing trend is still present (how
strong). Maybe too high though...
Posted by nlange@geomar.de on 2018-05-25 09:30:37 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
18HU20150504 - tco2
Analysis is done for normalized tco2 (Frijs et al. 2003). Temporal trend towards
higher concentrations visible. All crossovers are above the acceptable range.
Trend in line with previous findings. Given the trend, the data might just fall
nicely on it's line. No adjustment needed.
Posted by nlange@geomar.de on 2018-05-25 09:27:24 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
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