<rahmann et al. 
SFB754 Data Legacy 
TABLE 1 | (Continued) 
Cruise-id Vessel 
M116/1 FS Meteor 
530241 FS Sonne 
FS Meteor 
Start 
End 
2015-05-01 Pointe-ä- 
Pitre/Guadeloupe 
2015-06- 
23Manzanillo/Mexico 
2015-09-08 
Mindelo/Cape Verde 
2015-10-05 
Zuayaquil/Ecuador 
2016-08-28 
Mindelo/Cape Verde 
2017-03-02 
Valparaiso/Chile 
2017-04-11 
Sallao/Peru 
2017-05-06 
Sallao/Peru 
2017-06-01 
Sallao/Peru 
2018-02-15 
Mindelo/Cape Verde 
2015-06-03 
Mindelo/Cape Verde 
2015-07-24 
Guayaquil/Ecuador 
2015-10-13 
Recife/Brazil 
2015-10-22 
Antofagasta/Chile 
2016-10-03 
Zecife/Brazil 
2017-04-08 
Sallao/Peru 
2017-05-03 
Sallao/Peru 
2017-05-29 
Sallao/Peru 
2017-07-03 Bahia De 
_as Minas/Panama 
2018-03-13 06M320180215 
Recife/Brazil 
Expocode 
06M320150501 
06SN20150623 
06M320150908 
Cruise report DOI Main funding 
dol: 40.2842/er_m116_1 
doi: 10.3289/CR_S241 
doi: 10.2312/cr_m119 
doi: 10.3289/CR_S0243 
doi: 10.3289/CR_M130 
doi: 10.2312/cr_m135 
doi: 10.3289/CR_M136 
doi: 10.2312/er_m137 
SFB 754 
MAKS 
SFB 754; RACE 
M119 
30243 
FS Sonne 
ASTRA-OMZ 
A120 
FS Meteor 
SFB 754: RACE 
A125 
FS Meteor 
SFB 754 
A136 
FS Meteor 
SFB 754 
A137 
FS Meteor 
SFB 754 
138 
145 FS Meteor 
dol: 10.2312/ecr_m138 
SFB 754 
doi: 10.2312/ecer_m145 
SFB 754: RACE 
sampling of water masses at high horizontal resolution (ranging 
from less than 1 km for the Rapidcast system to 10 km for deep 
JCTD casts) with good accuracy of the pressure, temperature, 
and conductivity sensors. Processing of the data involved mostly 
the fall-rate dependent correction of the thermal lag of the 
conductivity sensor and followed the approach described by 
Jllman and Hebert (2014). Subsequently the corrected data were 
calibrated against the calibrated coincident Thermosalinograph 
(see subsequent section) and the calibrated nearby CTD data. The 
typical accuracies of the final pressure, temperature, and salinity 
data are 1 dbar, 0.01°C, and 0.01 g/kg, respectively. 
Thermosalinograph (TSG) Measurements 
For 32 SFB 754 cruises near-surface temperatures and salinities 
were collected using the ships’ thermosalinograph systems. 
The four ships on which the major cruises were conducted 
were equipped with different systems with either one or 
two thermosalinographs in parallel or in alternating operating 
mode (Krahmann and Mehrtens, 2021f; see Table 2 and 
Supplementary Table 8). All TSG data were cross-calibrated 
against the calibrated CTD data at the depth of the seawater 
intake for the TSG systems. 
Argo Floats 
The SFB 754 also made a contribution to the global Argo 
float program®. In 2009, 2011, and 2014 several floats equipped 
with additional Aanderaa oxygen sensors were deployed off 
Peru to study the effects of mesoscale eddies on the flow field 
and the water masses (Czeschel et al., 2018; Krahmann and 
Mehrtens, 2021g; see Table 2 and Supplementary Table 9). An 
effort was made to ensure the float data was compatible with 
the other observations of the SFB 754. Temperature data was 
deemed sufficiently accurate and no corrections were applied. 
Salinity data was corrected by the German Hydrographic Office 
using the approach from Owens and Wong (2009). Oxygen 
data were calibrated using different approaches depending 
on the availability of concurrent reference measurements (see 
for details Czeschel et al., 2011; Czeschel et al., 2012, 2018; 
Stramma et al., 2014). A number of regular Argo floats (without 
oxygen sensor) were deployed in the tropical Atlantic to 
accompany a tracer release experiment (see section “Transient 
Tracer Measurements”). Additionally several of the cruises were 
used to deploy regular Argo floats on behalf of the German 
Hydrographic Office. 
Chemical Oceanography 
The chemical oceanography program was comprehensive and 
included a range of different measurements whose scope was 
adapted to the different research questions of the cruises. 
While on all cruises chemical measurements were performed 
on water samples collected from the regular CTD/rosette 
system additional measurements were made on some cruises 
on water pumped continuously along the route of the ship. 
Measurements of oxygen from water samples and CTDO sensors 
were conducted during all cruises. On all cruises but MSM23 
autrient measurements were conducted, while measurements of 
'ransient tracers and the deliberately released tracer CF3SFs were 
conducted only on nine cruises (see Supplementary Table 10). 
[n addition, measurements of stable and radiogenic isotopes, 
‘he inorganic carbon system, nitrous oxide (N,O), iodide, trace 
chemical species, and a range of other variables were conducted 
during the SFB 754. For a description of the not so frequently 
measured variables see the cruise reports (see Table 1). 
Discrete Oxygen Measurements (Winkler Titration) 
In order to control the performance of the CTDO oxygen 
sensors as well as for their calibration discrete water samples 
(a few hundred to more than one thousand dependinge 
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Zeptember 2021 | Volume 8 | Article 7283204