Cruise: 06AQ20120107 (dataset:GLODAPv2.2019.NEW) Data product: GLODAPv2.2019, v2.2020, v2.2021 Successor: GLODAPv2.2022, v2.2023
Synonyms (including errata!) for this cruise: ANT-XXVIII/3; 06AQ20120107; alias: ANTXXVIII.3; 06AQ20120107; ANT-XXVIII/3
IMPORTANT information for GLODAP Reference Group Editors: This adjustment version is immutable and published in GLODAPv2.2020! Click here to switch to new version (GLODAPv2.2020)
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Plot/Data files re. Parameter(s) (select parameter on left side to view!):
alkalinity:2
cfc12:1
nitrate:2
oxygen:2
phosphate:2
silicate:2
tco2:2
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View comment(s) (filtered by salinity in subject)
06AQ20120107 - salinity
The deep water averages don't bring up any doubts (34.7093 vs 34.7125).
Maintain.
Posted by nlange@geomar.de on 2018-08-21 11:35:42 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
Filename: | Comment: | Action | |
---|---|---|---|
tco_MLR_ni.png | View | ||
tco_MLR_po4.png | View |
View comment(s) (filtered by tco2 in subject)
06AQ20120107 - tco2
The deep water averages indicate too high concentrations (2254 μmol kg−1 vs 2247
μmol kg−1). Two MLRs (calculated for 178 samples) with different predictor
variables do not support this rather strong offset though. If AOU is excluded as
a predictor variable the offset becomes even positives (not shown)... Maintain.
Posted by nlange@geomar.de on 2018-08-21 10:34:57 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
Filename: | Comment: | Action | |
---|---|---|---|
ta_MLR_ni.png | View | ||
ta_MLR_po4.png | View |
View comment(s) (filtered by alkalinity in subject)
06AQ20120107 - alkalinity
The deep water averages indicate good accuracy. Two MLRs (calculated for 208
samples) with different predictor variables confirm this result. Maintain.
Posted by nlange@geomar.de on 2018-08-21 10:41:19 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
View comment(s) (filtered by ph in subject)
06AQ20120107 - phosphate
The deep water average of the cruise is 2.27% higher than the one from
surrounding GLODAPv2 cruises. The MLR also show offsets indicating too high
concentrations. However, these ones point towards a bias slightly below 2%.
Since that is within the acceptable range and the uncertainty is quite large
anyway, maintain.
Posted by nlange@geomar.de on 2018-08-21 11:15:46 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
Filename: | Comment: | Action | |
---|---|---|---|
ni_MLR_po4.png | View | ||
ni_MLR_si.png | View |
View comment(s) (filtered by nitrate in subject)
06AQ20120107 - nitrate
The deep water averages indicate an acceptable accuracy (31.82 μmol kg−1 vs
31.44 μmol kg−1). Two MLRs show offsets smaller than 2% (calculated for 200 and
233 samples), i.e. also indicate good accuracy, and demonstrate an "ok"
agreement. Note the high range visible in the box-plots indicating quite a large
uncertainty - probably a result of the spreading of the stations (true for all
parameters of this cruise)... Maintain.
Posted by nlange@geomar.de on 2018-08-21 11:03:06 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
Filename: | Comment: | Action | |
---|---|---|---|
po4_MLR_ni.png | View | ||
po4_MLR_si.png | View |
View comment(s) (filtered by phosphate in subject)
06AQ20120107 - phosphate
The deep water average of the cruise is 2.27% higher than the one from
surrounding GLODAPv2 cruises. The MLR also show offsets indicating too high
concentrations. However, these ones point towards a bias slightly below 2%.
Since that is within the acceptable range and the uncertainty is quite large
anyway, maintain.
Posted by nlange@geomar.de on 2018-08-21 11:15:46 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
Filename: | Comment: | Action | |
---|---|---|---|
si_MLR_ni.png | View | ||
si_MLR_po4.png | View |
View comment(s) (filtered by silicate in subject)
06AQ20120107 - silicate
Changed to 1.00 Seatlle
Posted by ttanhua@geomar.de on 2018-09-26 17:21:12 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
06AQ20120107 - silicate
However, Silicate values has been used to check the quality of NO3 and PO4,
giving low offsets
Posted by fiz.perez@iim.csic.es on 2018-09-21 15:33:42 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
06AQ20120107 - silicate
The deep water averages indicate 3.68% too high concentrations . Unfortunately,
the offsets of two MLR differ strongly. Looking at the RMSE of the two MLR,
"si_MLR_po4" seems much more trustworthy. However, both O2 and PO4 might be
offset slightly thus complicating things again. All in all, the results are not
robust/informative enough to permit any adjustment.
Posted by nlange@geomar.de on 2018-08-21 11:25:32 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
Filename: | Comment: | Action | |
---|---|---|---|
oxy_MLR_ni.png | View | ||
oxy_MLR_po4.png | View |
View comment(s) (filtered by oxygen in subject)
06AQ20120107 - oxygen
Adjustment accepted Seattle
Posted by ttanhua@geomar.de on 2018-09-26 17:17:49 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
06AQ20120107 - oxygen
The deep water average of the cruise is 2.39% lower than the one from
surrounding GLODAPv2 cruises. Two different MLR also show offsets above the 1%
range. Adjusting following the smaller MLR offset seems appropriate - it has a
better MLR fit, too. Adjust upward.
Posted by nlange@geomar.de on 2018-08-21 11:32:17 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
Filename: | Comment: | Action | |
---|---|---|---|
CFC-12-saturation.png | View |
View comment(s) (filtered by cfc12 in subject)
06AQ20120107 - cfc12
No adjustment, Seattle
Posted by ttanhua@geomar.de on 2018-09-26 17:25:17 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
06AQ20120107 - cfc12
Even though within acceptable range this adjustment seems appropriate as the
water is oversaturated at all stations. Mean saturation ratio is 1.03.
Posted by nlange@geomar.de on 2018-04-27 09:16:46 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
View 13 comment(s) (Lists all comments)
06AQ20120107 - cfc12
No adjustment, Seattle
Posted by ttanhua@geomar.de on 2018-09-26 17:25:17 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
06AQ20120107 - silicate
Changed to 1.00 Seatlle
Posted by ttanhua@geomar.de on 2018-09-26 17:21:12 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
06AQ20120107 - oxygen
Adjustment accepted Seattle
Posted by ttanhua@geomar.de on 2018-09-26 17:17:49 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
06AQ20120107 - silicate
However, Silicate values has been used to check the quality of NO3 and PO4,
giving low offsets
Posted by fiz.perez@iim.csic.es on 2018-09-21 15:33:42 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
06AQ20120107 - salinity
The deep water averages don't bring up any doubts (34.7093 vs 34.7125).
Maintain.
Posted by nlange@geomar.de on 2018-08-21 11:35:42 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
06AQ20120107 - oxygen
The deep water average of the cruise is 2.39% lower than the one from
surrounding GLODAPv2 cruises. Two different MLR also show offsets above the 1%
range. Adjusting following the smaller MLR offset seems appropriate - it has a
better MLR fit, too. Adjust upward.
Posted by nlange@geomar.de on 2018-08-21 11:32:17 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
06AQ20120107 - silicate
The deep water averages indicate 3.68% too high concentrations . Unfortunately,
the offsets of two MLR differ strongly. Looking at the RMSE of the two MLR,
"si_MLR_po4" seems much more trustworthy. However, both O2 and PO4 might be
offset slightly thus complicating things again. All in all, the results are not
robust/informative enough to permit any adjustment.
Posted by nlange@geomar.de on 2018-08-21 11:25:32 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
06AQ20120107 - phosphate
The deep water average of the cruise is 2.27% higher than the one from
surrounding GLODAPv2 cruises. The MLR also show offsets indicating too high
concentrations. However, these ones point towards a bias slightly below 2%.
Since that is within the acceptable range and the uncertainty is quite large
anyway, maintain.
Posted by nlange@geomar.de on 2018-08-21 11:15:46 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
06AQ20120107 - nitrate
The deep water averages indicate an acceptable accuracy (31.82 μmol kg−1 vs
31.44 μmol kg−1). Two MLRs show offsets smaller than 2% (calculated for 200 and
233 samples), i.e. also indicate good accuracy, and demonstrate an "ok"
agreement. Note the high range visible in the box-plots indicating quite a large
uncertainty - probably a result of the spreading of the stations (true for all
parameters of this cruise)... Maintain.
Posted by nlange@geomar.de on 2018-08-21 11:03:06 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
06AQ20120107 - alkalinity
The deep water averages indicate good accuracy. Two MLRs (calculated for 208
samples) with different predictor variables confirm this result. Maintain.
Posted by nlange@geomar.de on 2018-08-21 10:41:19 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
06AQ20120107 - tco2
The deep water averages indicate too high concentrations (2254 μmol kg−1 vs 2247
μmol kg−1). Two MLRs (calculated for 178 samples) with different predictor
variables do not support this rather strong offset though. If AOU is excluded as
a predictor variable the offset becomes even positives (not shown)... Maintain.
Posted by nlange@geomar.de on 2018-08-21 10:34:57 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
06AQ20120107
An additional MLR analysis based on GLODAPv2 has been carried out for all given
variables (for the most part following the method described in Jutterström et
al., 2010). Herefore only deep and approximate data (as for the crossover
analysis) has been used.
Posted by nlange@geomar.de on 2018-08-21 10:24:52 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
06AQ20120107 - cfc12
Even though within acceptable range this adjustment seems appropriate as the
water is oversaturated at all stations. Mean saturation ratio is 1.03.
Posted by nlange@geomar.de on 2018-04-27 09:16:46 UTC for data product: GLODAPv2.2019, v2.2020, v2.2021
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