Dangl, Gabriela; Frey, Claudia; Hassenrück, Christiane; Sabbaghzadeh, Bita; Wäge-Recchioni, Janine; Lehmann, Moritz F; Ley, Martin; Rehder, Gregor; Jürgens, Klaus (2023): Inorganic nutrient measurements in the Benguela Upwelling System during METEOR cruise M157 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.956014
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Abstract:
Upwelling systems are significant sources of atmospheric nitrous oxide (N₂O). The Benguela Upwelling System is one of the most productive regions worldwide and a temporally variable source of N₂O. Strong O₂ depletions above the shelf are favoring periodically OMZ formations. We aimed to assess underlying N₂O production and consumption processes on different temporal and spatial scales during austral winter in the Benguela Upwelling System, when O₂-deficiency in the water column is relatively low.
The fieldwork took place during the cruise M157 (August 4ᵗʰ – September 16ᵗʰ 2019) onboard the R/V METEOR. This expedition included four close-coastal regions around Walvis Bay at 23°S, which presented the lowest O₂ concentrations near the seafloor and thus may provide hotspots of N₂O production. Seawater was collected in 10 L free-flow bottles by using a rosette system equipped with conductivity-temperature-depth (CTD) sensors (SBE 911plus, Seabird-electronics, USA).
Concentrations of inorganic nutrients (PO₄³⁻, NH₄⁺, NO₃⁻, NO₂⁻, and SiO₂) were measured colorimetrically according to Grasshoff et al. (1999) by means of a continuous segmented flow analyzer (SEAL Analytical, QuAAtro39). To determine the water mass fractions along the sampling transects, vertical profiles were collected using a free-falling microstructure profiler (MSS90L, Sea & Sun Technology). Temperature, dissolved oxygen, and salinity were measured with a CTD system consisting of a SeaBird 911+ probe, mounted on a sampling rosette.
Keyword(s):
Related to:
Dangl, Gabriela; Frey, Claudia; Hassenrück, Christiane; Sabbaghzadeh, Bita; Wäge-Recchioni, Janine; Lehmann, Moritz F; Ley, Martin; Rehder, Gregor; Jürgens, Klaus (2023): Nitrous oxide measurements in the Benguela Upwelling System during METEOR cruise M157. PANGAEA, https://doi.org/10.1594/PANGAEA.955991
Dangl, Gabriela; Frey, Claudia; Hassenrück, Christiane; Sabbaghzadeh, Bita; Wäge-Recchioni, Janine; Lehmann, Moritz F; Ley, Martin; Rehder, Gregor; Jürgens, Klaus (2023): Nitrous oxide production rates and stable isotopes in the Benguela Upwelling System during METEOR cruise M157. PANGAEA, https://doi.org/10.1594/PANGAEA.956016
Sabbaghzadeh, Bita; Glockzin, Michael; Rehder, Gregor (2022): Trace gases air daily means during METEOR cruise M157. PANGAEA, https://doi.org/10.1594/PANGAEA.946811
Zabel, Matthias (2020): Short Cruise Report RV METEOR Cruise M157. Expeditionsarchiv FS METEOR, 13, https://www.ldf.uni-hamburg.de/meteor/wochenberichte/wochenberichte-meteor/m156-m159/m157-scr.pdf (m157-scr.pdf)
References:
Grasshoff, Klaus; Kremling, Klaus; Ehrhardt, M (1999): Methods of Seawater Analysis, Third Edition. Wiley-VCH, https://doi.org/10.1002/9783527613984.fmatter
Coverage:
Median Latitude: -22.757852 * Median Longitude: 13.748598 * South-bound Latitude: -25.000050 * West-bound Longitude: 11.066666 * North-bound Latitude: -17.266666 * East-bound Longitude: 14.561070
Date/Time Start: 2019-08-21T06:10:00 * Date/Time End: 2019-09-13T10:49:00
Minimum DEPTH, water: 5 m * Maximum DEPTH, water: 1500 m
Event(s):
M157_2-8 * Latitude: -23.000167 * Longitude: 14.366750 * Date/Time: 2019-08-24T04:52:00 * Elevation: -46.0 m * Campaign: M157 (BUSUC 1) * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
M157_2-9 * Latitude: -22.999800 * Longitude: 14.366900 * Date/Time: 2019-09-13T10:49:00 * Elevation: -46.0 m * Campaign: M157 (BUSUC 1) * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
M157_9-2 * Latitude: -22.999833 * Longitude: 13.316467 * Date/Time: 2019-08-25T20:43:00 * Elevation: -361.0 m * Campaign: M157 (BUSUC 1) * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Dangl, Gabriela | |||
| 2 | Sample code/label | Sample label | Dangl, Gabriela | Sample title used in 16S amplicon sequence data submission | ||
| 3 | Station label | Station | Dangl, Gabriela | |||
| 4 | DATE/TIME | Date/Time | Dangl, Gabriela | Geocode | ||
| 5 | LATITUDE | Latitude | Dangl, Gabriela | Geocode | ||
| 6 | LONGITUDE | Longitude | Dangl, Gabriela | Geocode | ||
| 7 | DEPTH, water | Depth water | m | Dangl, Gabriela | CTD, Sea-Bird SBE 911plus | Geocode |
| 8 | Oxygen | O2 | µmol/l | Dangl, Gabriela | CTD, Sea-Bird SBE 911plus | in-situ |
| 9 | Temperature, water | Temp | °C | Dangl, Gabriela | CTD, Sea-Bird SBE 911plus | in-situ |
| 10 | Salinity | Sal | Dangl, Gabriela | CTD, Sea-Bird SBE 911plus | PSU; in-situ | |
| 11 | Phosphate | [PO4]3- | µmol/l | Dangl, Gabriela | Continuous Segmented Flow Analyzer, SEAL Analytical, QuAAtro39 | in-situ |
| 12 | Nitrate | [NO3]- | µmol/l | Dangl, Gabriela | Continuous Segmented Flow Analyzer, SEAL Analytical, QuAAtro39 | in-situ |
| 13 | Nitrite | [NO2]- | µmol/l | Dangl, Gabriela | Continuous Segmented Flow Analyzer, SEAL Analytical, QuAAtro39 | in-situ |
| 14 | Ammonium | [NH4]+ | µmol/l | Dangl, Gabriela | Continuous Segmented Flow Analyzer, SEAL Analytical, QuAAtro39 | in-situ |
| 15 | Silicate | Si(OH)4 | µmol/l | Dangl, Gabriela | Continuous Segmented Flow Analyzer, SEAL Analytical, QuAAtro39 | in-situ |
| 16 | Water mass | Water | % | Dangl, Gabriela | Microstructure profiler, Sea & Sun Technology, MSS90L | of South Atlantic Central Water; in-situ |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1660 data points