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Sukekava, Camila Fiaux; Andrade, Carlos Francisco Ferreira de; Wallner-Kersanach, Mônica; Carvalho, Iarema; Contreira, Leonardo; Lima, Kayla; Paiva, Mariele; Costa, Daniel; Souza, Gabriel Karagiannis; Niencheski, Luis Felipe Hax; Laglera, Luis Miguel (2023): Macronutrients and iron speciation on southern Brazilian continental shelf in summer 2015 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.951154

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Published: 2023-01-04DOI registered: 2023-02-02

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Abstract:
In summer 2015, The RV Atlântico Sul cruise collected water column samples for macronutrients, dissolved iron (DFe) concentrations and speciation and humic substances (HS) in a transect over the shelf of the South Brazil Bight (SBB) at Santa Marta Grande Cape (28.5°S, SE Brazil) during coastal downwelling episode.
Samples were collected over the whole shelf and the initial section of the slope. All samples were collected using 12-liter Teflon-coated Go-Flo bottles suspended on a Kevlar line. Samples were divided into nutrients and trace metals onboard. Samples for nutrients were filtered through 0.45 µm filters (cellulose acetate, Millipore), and samples for dissolved DFe, organic iron speciation and HS were immediately filtered by 0.2 µm (cellulose nitrate ,Millipore). All samples were immediately frozen for analysis.
In laboratory, samples were thawed and analyzed for nutrients the analytical methodology used was described in Strickland and Parsons, (1972). DFe concentrations, the samples were determined following a well-established CSV method (Laglera et al., 2013) adding a UV digestion step. Organic iron speciation was analyzed using a modified method described initially by (van den Berg, 2006), but modified removing the addition of bromate from the original method to avoid any underestimation of the contribution of HS to ligand concentrations (Laglera et al., 2011). The determination of HS concentrations and iron-humic complex concentrations following stablished CSV procedures (Laglera et al., 2007; Sukekava et al., 2018).
Using those samples, the aim of this research was comprehending the effect of coastal downwelling such episodes in the distributions of macronutrients, DFe and humic substances in SBB.
Keyword(s):
continental shelf; humic substances; iron; southern Brazilian margin; Upwelling
Supplement to:
Sukekava, Camila Fiaux; Andrade, Carlos Francisco Ferreira de; Niencheski, Luis Felipe Hax; de Souza, Márcio Silva; Laglera, Luis Miguel (2023): Macronutrients, iron and humic substances summer cycling over the extended continental shelf of the South Brazil Bight. Science of the Total Environment, 865, 161182, https://doi.org/10.1016/j.scitotenv.2022.161182
Further details:
Caprara, Salvatore; Laglera, Luis Miguel; Monticelli, Damiano (2015): Ultrasensitive and Fast Voltammetric Determination of Iron in Seawater by Atmospheric Oxygen Catalysis in 500 μL Samples. Analytical Chemistry, 87(12), 6357-6363, https://doi.org/10.1021/acs.analchem.5b01239
Laglera, Luis Miguel; Battaglia, Gianluca; van den Berg, Constant M G (2011): Effect of humic substances on the iron speciation in natural waters by CLE/CSV. Marine Chemistry, 127(1-4), 134-143, https://doi.org/10.1016/j.marchem.2011.09.003
Laglera, Luis Miguel; Battaglia, Gianluca; Van den Berg, Johnnie; van den Berg, Constant M G (2007): Determination of humic substances in natural waters by cathodic stripping voltammetry of their complexes with iron. Analytica Chimica Acta, 599(1), 58-66, https://doi.org/10.1016/j.aca.2007.07.059
Laglera, Luis Miguel; Santos-Echeandía, Juan; Caprara, Salvatore; Monticelli, Damiano (2013): Quantification of Iron in Seawater at the Low Picomolar Range Based on Optimization of Bromate/Ammonia/Dihydroxynaphtalene System by Catalytic Adsorptive Cathodic Stripping Voltammetry. Analytical Chemistry, 85(4), 2486-2492, https://doi.org/10.1021/ac303621q
Strickland, John D H; Parsons, T R (1972): A practical handbook of seawater analysis. Fisheries Research Board of Canada, hdl:10013/epic.46454.d001
Sukekava, Camila Fiaux; Downes, Javier; Slagter, Hans A; Gerringa, Loes J A; Laglera, Luis Miguel (2018): Determination of the contribution of humic substances to iron complexation in seawater by catalytic cathodic stripping voltammetry. Talanta, 189, 359-364, https://doi.org/10.1016/j.talanta.2018.07.021
van den Berg, Constant M G (2006): Chemical Speciation of Iron in Seawater by Cathodic Stripping Voltammetry with Dihydroxynaphthalene. Analytical Chemistry, 78(1), 156-163, https://doi.org/10.1021/ac051441%2B
Coverage:
Median Latitude: -28.901409 * Median Longitude: -47.837136 * South-bound Latitude: -29.098000 * West-bound Longitude: -48.800000 * North-bound Latitude: -28.593000 * East-bound Longitude: -47.240000
Date/Time Start: 2015-01-19T11:00:00 * Date/Time End: 2015-01-20T16:00:00
Minimum DEPTH, water: 1.0 m * Maximum DEPTH, water: 1500.0 m
Event(s):
INCT_Jan2015_SM_01  * Latitude: -28.593000 * Longitude: -48.800000 * Date/Time: 2015-01-19T00:00:00 * Campaign: INCT-COI_2015 (INCT-COI 2015) * Basis: Atlantico Sul * Method/Device: Water sample (WS)
INCT_Jan2015_SM_02  * Latitude: -28.612000 * Longitude: -48.740000 * Date/Time: 2015-01-19T00:00:00 * Campaign: INCT-COI_2015 (INCT-COI 2015) * Basis: Atlantico Sul * Method/Device: Water sample (WS)
INCT_Jan2015_SM_03  * Latitude: -28.726000 * Longitude: -48.382000 * Date/Time: 2015-01-19T00:00:00 * Campaign: INCT-COI_2015 (INCT-COI 2015) * Basis: Atlantico Sul * Method/Device: Water sample (WS)
Comment:
Project: 'INCT - Mar Centro de Oceanografia Integrada (INCT Mar-COI)', https://inct.furg.br
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
Event labelEventSukekava, Camila Fiaux
Station labelStationSukekava, Camila FiauxStation
Station labelStationSukekava, Camila FiauxStation number
Station labelStationSukekava, Camila FiauxStation name
LATITUDELatitudeSukekava, Camila FiauxGeocode
LONGITUDELongitudeSukekava, Camila FiauxGeocode
Depth, bottom/maxDepth botmSukekava, Camila FiauxBottom of the station
DEPTH, waterDepth watermSukekava, Camila FiauxGeocode – Sampling depth
DATE/TIMEDate/TimeSukekava, Camila FiauxGeocode – Sampling time; UTC
10 Date/Time localDate/Time localSukekava, Camila FiauxSampling time; Brasília Time (i.e. UTC-03:00)
11 Wind directiondddegSukekava, Camila Fiaux
12 Wind speedffm/sSukekava, Camila Fiaux
13 Temperature, waterTemp°CSukekava, Camila FiauxITS-90
14 ConductivityCondmS/cmSukekava, Camila Fiaux
15 SalinitySalSukekava, Camila FiauxPSU
16 pHpHSukekava, Camila Fiaux
17 OxygenO2mg/lSukekava, Camila Fiaux
18 Oxygen saturationO2 sat%Sukekava, Camila Fiaux
19 Turbidity (Nephelometric turbidity unit)TurbidityNTUSukekava, Camila Fiaux
20 Ammonium[NH4]+µmol/lSukekava, Camila Fiaux
21 Nitrite[NO2]-µmol/lSukekava, Camila Fiaux
22 Nitrate[NO3]-µmol/lSukekava, Camila Fiaux
23 Phosphate[PO4]3-µmol/lSukekava, Camila Fiaux
24 SilicateSi(OH)4µmol/lSukekava, Camila Fiaux
25 Iron, dissolvedFe dissnmol/lSukekava, Camila FiauxCathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after Laglera et al. (2013)
26 Iron, dissolved, standard deviationFe diss std dev±Sukekava, Camila FiauxCathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after Laglera et al. (2013)
27 Ligand concentrationLigandsnmol/lSukekava, Camila FiauxCathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after van den Berg (2006, doi:10.1021/ac051441+) and without purge as Caprara et al. (2015, doi:10.1021/acs.analchem.5b01239)
28 Ligand concentration, standard deviationLigands std dev±Sukekava, Camila FiauxCathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after van den Berg (2006, doi:10.1021/ac051441+) and without purge as Caprara et al. (2015, doi:10.1021/acs.analchem.5b01239)
29 Iron, inorganic, conditional stability constantsLog K Fe'LSukekava, Camila FiauxCathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after van den Berg (2006, doi:10.1021/ac051441+) and without purge as Caprara et al. (2015, doi:10.1021/acs.analchem.5b01239)Constant of equilibrium of iron organic speciation.
30 Iron, inorganic, conditional stability constants, standard deviationLog K Fe'L std dev±Sukekava, Camila FiauxCathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after van den Berg (2006, doi:10.1021/ac051441+) and without purge as Caprara et al. (2015, doi:10.1021/acs.analchem.5b01239)
31 Side coefficient of dissolved Fe-complex ligandsLog alpha Fe3+LiSukekava, Camila FiauxCathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after van den Berg (2006, doi:10.1021/ac051441+) and without purge as Caprara et al. (2015, doi:10.1021/acs.analchem.5b01239)Logarithm of side reaction coefficient, which is the concentration ratio of complexed iron to the free iron.
32 Humic substancesHumicsmg/lSukekava, Camila FiauxCathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after Sukekava et al. (2018)Related to Suwannee River Fulvic Acid (SRFA)
33 PercentagePerc%Sukekava, Camila FiauxCathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after Sukekava et al. (2018)Percentage of humic substances that are considered ligand.
34 IronFenmol/lSukekava, Camila FiauxCathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after Sukekava et al. (2018)Iron complexed by humic substances
35 PercentagePerc%Sukekava, Camila FiauxCathodic stripping voltammetry: Metrohm 663 VA stand, control hardware (Metrohm IME 663) after Sukekava et al. (2018)Percentage of dissolved iron that form iron-humic substances complex
36 Density, sigma-theta (0)Sigma-thetakg/m3Sukekava, Camila Fiaux
37 RatioRatioSukekava, Camila FiauxC/N; Ratio isotope δ13C and δ15N in particulate matter
38 Carbon, organic, particulatePOC%Sukekava, Camila FiauxPercentage of organic particulate carbon in the particulate matter
39 Carbon, organic, particulatePOCµg/lSukekava, Camila Fiaux
40 RatioRatioSukekava, Camila FiauxRatio ligand and iron complexed by humic substances
41 RatioRatioSukekava, Camila FiauxRatio nitrate and phosphate
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
771 data points

Data

Download dataset as tab-delimited text — use the following character encoding:


Event

Station
(Station)

Station
(Station number)

Station
(Station name)

Latitude

Longitude

Depth bot [m]
(Bottom of the station)

Depth water [m]
(Sampling depth)

Date/Time
(Sampling time; UTC)
10 
Date/Time local
(Sampling time; Brasília Time ...)
11 
dd [deg]
12 
ff [m/s]
13 
Temp [°C]
(ITS-90)
14 
Cond [mS/cm]
15 
Sal
(PSU)
16 
pH
17 
O2 [mg/l]
18 
O2 sat [%]
19 
Turbidity [NTU]
20 
[NH4]+ [µmol/l]
21 
[NO2]- [µmol/l]
22 
[NO3]- [µmol/l]
23 
[PO4]3- [µmol/l]
24 
Si(OH)4 [µmol/l]
25 
Fe diss [nmol/l]
(Cathodic stripping voltammetr...)
26 
Fe diss std dev [±]
(Cathodic stripping voltammetr...)
27 
Ligands [nmol/l]
(Cathodic stripping voltammetr...)
28 
Ligands std dev [±]
(Cathodic stripping voltammetr...)
29 
Log K Fe'L
(Constant of equilibrium of ir...)
30 
Log K Fe'L std dev [±]
(Cathodic stripping voltammetr...)
31 
Log alpha Fe3+Li
(Logarithm of side reaction co...)
32 
Humics [mg/l]
(Related to Suwannee River Ful...)
33 
Perc [%]
(Percentage of humic substance...)
34 
Fe [nmol/l]
(Iron complexed by humic subst...)
35 
Perc [%]
(Percentage of dissolved iron ...)
36 
Sigma-theta [kg/m3]
37 
Ratio
(C/N; Ratio isotope δ13C and δ...)
38 
POC [%]
(Percentage of organic particu...)
39 
POC [µg/l]
40 
Ratio
(Ratio ligand and iron complex...)
41 
Ratio
(Ratio nitrate and phosphate)
INCT_Jan2015_SM_01 SM 0124SM 01 S-28.593-48.800132.92015-01-19T11:002015-01-19T08:00228.03.226.850.032.97.847.5394.50.692.950.192.110.397.101.680.243.000.2022.943.8117278360.1114710.081285500421.73668.7554.42544.252.9187145005.410256410
INCT_Jan2015_SM_01SM 0125SM 01 F-28.593-48.8001311.52015-01-19T11:002015-01-19T08:00228.03.226.850.232.97.867.4292.91.252.810.262.661.5010.631.590.363.600.2021.690.113.2463025010.0795320.127701090723.12177.5204.25042.503.4722989101.773333333
INCT_Jan2015_SM_02 SM 0226SM 02 S-28.612-48.740512.52015-01-19T11:002015-01-19T08:00247.05.526.649.832.77.857.7896.50.252.530.091.290.569.752.160.338.100.2021.830.083.7384850190.0594110.3593458431521.20319.7552.56525.657.7406541572.303571429
INCT_Jan2015_SM_02SM 0227SM 02 F-28.612-48.7405145.02015-01-19T11:002015-01-19T08:00247.05.523.452.334.47.726.1873.21.232.881.003.300.8818.281.830.427.500.2021.870.173.7450612630.0883170.2910608551424.51048.5851.99019.907.2089391453.750000000
INCT_Jan2015_SM_03 SM 0329SM 03 I-28.726-48.3829740.02015-01-19T20:302015-01-19T17:30247.01.919.053.635.17.877.1781.61.084.010.081.590.203.574.490.224.490.01240.007264960025.306010.2501.58715.874.4827350407.950000000
INCT_Jan2015_SM_03SM 0330SM 03 F-28.726-48.3829790.02015-01-19T20:302015-01-19T17:30247.01.923.753.835.47.888.41102.00.492.740.177.170.689.161.240.107.500.3021.230.113.10506126326.167311.9606.61066.1010.544117650
INCT_Jan2015_SM_04 SM 0431SM 04 S-28.887-47.8622001.02015-01-20T01:302015-01-19T22:30314.02.327.553.735.67.897.7798.60.575.770.122.830.152.101.750.148.300.3021.750.093.6690780920.0822140.3084871231523.66857.99151287718.866666670
INCT_Jan2015_SM_04SM 0432SM 04 I 40-28.887-47.86220040.02015-01-20T01:302015-01-19T22:30314.02.323.554.135.77.908.2599.60.092.670.050.630.1518.281.740.334.300.3021.940.933.5734684560.0322110.073491166424.67028.5101.21012.104.2265088344.200000000
INCT_Jan2015_SM_04SM 0433SM 04 I 90-28.887-47.86220090.02015-01-20T01:302015-01-19T22:30314.02.319.653.335.07.867.9488.00.832.600.104.790.594.010.990.013.100.2021.940.183.4313616940.0279130.3172127402525.97929.5302.35023.502.7827872608.118644068
INCT_Jan2015_SM_04SM 0434SM 04 F-28.887-47.862200190.02015-01-20T01:302015-01-19T22:30314.02.316.953.034.57.797.7784.31.882.310.099.120.975.193.530.383.530.05700.4324403201123.65509.5902.54025.403.0975596809.402061856
INCT_Jan2015_SM_05 SM 0535SM 05 S-28.947-47.6895212.52015-01-20T10:502015-01-20T07:50176.02.827.553.735.67.967.7596.90.062.380.061.160.915.344.930.815.800.2022.060.114.1520599910.0927340.232813352425.19239.8501.89018.905.5671866481.274725275
INCT_Jan2015_SM_05SM 0536SM 05 I 50-28.947-47.68952150.02015-01-20T10:502015-01-20T07:50176.02.824.954.335.97.948.2099.00.062.740.063.961.542.842.320.332.700.6021.870.563.1771212550.0812400.3210782651226.095210.4601.65016.502.3789217352.571428571
INCT_Jan2015_SM_05SM 0537SM 05 I 100-28.947-47.689521100.02015-01-20T10:502015-01-20T07:50176.02.821.253.535.17.838.0793.80.092.810.247.390.253.872.950.585.200.8020.910.142.4858748560.2405621.3575374194226.685813.8803.15031.503.84246258129.560000000
INCT_Jan2015_SM_05SM 0538SM 05 I 250-28.947-47.689521250.02015-01-20T10:502015-01-20T07:50176.02.815.852.534.17.768.2089.70.413.230.0613.530.957.691.270.105.000.2022.080.113.7789700040.026480.038471000226.94776.7000.0500.504.96152900014.242105260
INCT_Jan2015_SM_05SM 0539SM 05 F-28.947-47.689521500.02015-01-20T10:502015-01-20T07:50176.02.814.052.133.77.668.4792.30.492.950.0519.451.4511.372.550.414.600.1022.330.063.9927578320.019560.036944570123.090012.0506.57065.704.56305543013.413793100
INCT_Jan2015_SM_06 SM 0640SM 06 S-29.098-47.24015002.52015-01-20T16:002015-01-20T13:00163.32.729.453.635.67.947.78101.60.067.040.052.600.112.544.330.155.000.5022.150.213.5349733480.0471260.274859600624.981312.6802.86028.604.72514040023.636363640
INCT_Jan2015_SM_06SM 0641SM 06 I 50-29.098-47.240150050.02015-01-20T16:002015-01-20T13:00163.32.727.754.436.17.948.18100.80.063.440.071.480.202.250.990.153.300.3021.490.242.6223979980.0550280.016048320125.54729.0479.60096.003.2839516807.400000000
INCT_Jan2015_SM_06SM 0642SM 06 I 100-29.098-47.2401500100.02015-01-20T16:002015-01-20T13:00163.32.723.654.435.97.938.2799.40.094.220.050.920.185.041.550.301.700.0422.570.113.8004489210.0228200.014621024126.359810.6902.27022.701.6853789765.111111111
INCT_Jan2015_SM_06SM 0643SM 06 I 250-29.098-47.2401500250.02015-01-20T16:002015-01-20T13:00163.32.717.753.134.67.807.7084.10.347.180.127.970.858.131.690.483.100.2021.410.122.9013616940.0363170.031794420227.096412.8002.35023.503.0682055809.376470588
INCT_Jan2015_SM_06SM 0644SM 06 I 500-29.098-47.2401500500.02015-01-20T16:002015-01-20T13:00163.32.712.751.833.57.688.3087.90.523.160.0310.411.9413.570.880.063.400.1021.950.253.4814789170.0343150.1270402581127.09640.5205.203.2729597425.365979381
INCT_Jan2015_SM_06SM 0646SM 06 I 1000-29.098-47.24015001000.02015-01-20T16:002015-01-20T13:00163.32.78.352.233.47.608.3377.40.063.870.0527.742.7032.841.670.242.500.1022.320.113.7179400090.0182110.063923662327.309317.2204.71047.102.43607633810.274074070
INCT_Jan2015_SM_06SM 0647SM 06 F-29.098-47.24015001500.02015-01-20T16:002015-01-20T13:00163.32.77.152.633.57.618.0570.50.105.630.0423.992.4528.133.020.495.500.4021.710.343.4503626890.020750.018133200127.51040.0500.505.4818668009.791836735