Fernández-Carrera, Ana; Montoya, Joseph P; Subramaniam, Ajit (2023): Biological nitrogen fixation and stable isotopes of carbon in seston during Meteor cruise M119 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.962547
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Abstract:
Biological nitrogen fixation is a key process balancing the loss of combined nitrogen in the marine nitrogen cycle. Its relevance in upwelling systems is not fully resolved. This dataset contains rates of nitrogen fixation through the euphotic layer in two size fractions measured following Montoya et al (1996) technique. It also contains the stable isotopes of carbon in seston expressed in delta notation (δ13C, ‰, VPDB). We sampled in the region of the Guinea Dome and Equatorial Atlantic Ocean along 23°W during Meteor cruise M119 in September 2015. Water samples were collected by niskin bottles attached to a rosette equipped with CTD sensors. Incubations were done in on-deck incubators refrigerated by running surface water continuously and simulating the light intensity of each depth by neutral density filters or meshes.
Supplement to:
Fernández-Carrera, Ana; Kiko, Rainer; Hauss, Helena; Hamilton, Douglas S; Achterberg, Eric Pieter; Montoya, Joseph P; Dengler, Marcus; Brandt, Peter; Subramaniam, Ajit (2023): Nitrogen fixation rates in the Guinea Dome and the equatorial upwelling regions in the Atlantic Ocean. Biogeochemistry, https://doi.org/10.1007/s10533-023-01089-w
Related to:
Krahmann, Gerd (2016): Physical oceanography during METEOR cruise M119 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.860484
References:
Montoya, Joseph P; Voss, Maren; Kähler, Paul; Capone, D G (1996): A Simple, High-Precision, High-Sensitivity Tracer Assay for N2 Fixation. Applied and Environmental Microbiology, 62(3), 986-993, https://doi.org/10.1128/aem.62.3.986-993.1996
Funding:
Gordon and Betty Moore Foundation, grant/award no. GBMF4886: Nitrogen Fixation in the Equatorial Atlantic Upwelling System
Coverage:
Median Latitude: 5.663093 * Median Longitude: -23.048968 * South-bound Latitude: -4.500000 * West-bound Longitude: -24.295500 * North-bound Latitude: 17.604500 * East-bound Longitude: -21.210000
Date/Time Start: 2015-09-09T18:29:00 * Date/Time End: 2015-09-26T07:21:00
Minimum Elevation: -5893.0 m * Maximum Elevation: -1313.0 m
Event(s):
M119_692-1 (CTD003) * Latitude: 17.604500 * Longitude: -24.295500 * Date/Time: 2015-09-09T18:29:00 * Elevation: -3613.0 m * Campaign: M119 * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
M119_698-1 (CTD005) * Latitude: 14.499170 * Longitude: -23.000330 * Date/Time: 2015-09-11T11:08:00 * Elevation: -4093.0 m * Campaign: M119 * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
M119_703-1 (CTD007) * Latitude: 13.499670 * Longitude: -23.000670 * Date/Time: 2015-09-11T23:22:00 * Elevation: -4542.0 m * Campaign: M119 * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Subramaniam, Ajit | |||
| 2 | Sample code/label | Sample label | Subramaniam, Ajit | |||
| 3 | Gear | Gear | Subramaniam, Ajit | |||
| 4 | Abbreviation | Abbrev | Subramaniam, Ajit | |||
| 5 | DATE/TIME | Date/Time | Subramaniam, Ajit | Geocode | ||
| 6 | LATITUDE | Latitude | Subramaniam, Ajit | Geocode | ||
| 7 | LONGITUDE | Longitude | Subramaniam, Ajit | Geocode | ||
| 8 | ELEVATION | Elevation | m a.s.l. | Subramaniam, Ajit | Geocode | |
| 9 | Location | Location | Subramaniam, Ajit | |||
| 10 | DEPTH, water | Depth water | m | Subramaniam, Ajit | CTD, Sea-Bird, SBE 11 plus | Geocode |
| 11 | Temperature, water | Temp | °C | Subramaniam, Ajit | CTD, Sea-Bird, SBE 11 plus | data from Krahmann (2016) |
| 12 | Salinity | Sal | Subramaniam, Ajit | CTD, Sea-Bird, SBE 11 plus | water, PSU (data from Krahmann 2016) | |
| 13 | δ13C, seston | δ13C sest | ‰ PDB | Subramaniam, Ajit | Continuous flow isotope ratio mass spectrometer (CF-IRMS), Micromass, Optima; coupled with Elemental analyser, Carlo Erba, NC2500 | VPDB |
| 14 | Trichodesmium, carbon in seston | Trichodesmium C sest | % | Subramaniam, Ajit | Calculated according to Fry (2006) | Percent contribution of Trichodesmium to C in seston derived by two-end-member mixing model. End members δ13C Tricho = -12.9‰, δ13C Phytoplankton = -22‰ |
| 15 | Nitrogen | N | % | Subramaniam, Ajit | Continuous flow isotope ratio mass spectrometer (CF-IRMS), Micromass, Optima; coupled with Elemental analyser, Carlo Erba, NC2500 | atom%N at the beginning of incubation, natural abundance (time 0) |
| 16 | Sample volume | Samp vol | ml | Subramaniam, Ajit | V incubated | |
| 17 | Nitrogen, 15N labeled | 15N2 | ml | Subramaniam, Ajit | added: Cambridge Isotopes98 atom%, Cambridge Isotopes Lot. #I-19168A | |
| 18 | Incubation duration | Inc dur | h | Subramaniam, Ajit | ||
| 19 | Nitrogen, particulate, size fraction <10 µm | PN <10 µm | µmol/l | Subramaniam, Ajit | Continuous flow isotope ratio mass spectrometer (CF-IRMS), Micromass, Optima; coupled with Elemental analyser, Carlo Erba, NC2500 | Small T24, avg: Average of Particulate Nitrogen in the <10µm size fraction at the end of incubation (time 24) |
| 20 | Nitrogen, particulate, size fraction <10 µm, standard deviation | PN <10 µm std dev | ± | Subramaniam, Ajit | Continuous flow isotope ratio mass spectrometer (CF-IRMS), Micromass, Optima; coupled with Elemental analyser, Carlo Erba, NC2500 | Small T24 SD: Standard Deviation of Particulate Nitrogen in the <10µm size fraction at the end of incubation (time 24) |
| 21 | Nitrogen, particulate, size fraction > 10 µm | PN >10 µm | µmol/l | Subramaniam, Ajit | Continuous flow isotope ratio mass spectrometer (CF-IRMS), Micromass, Optima; coupled with Elemental analyser, Carlo Erba, NC2500 | Large T24, avg: Average of Particulate Nitrogen in the >10µm size fraction at the end of incubation (time 24) |
| 22 | Nitrogen, particulate, size fraction > 10 µm, standard deviation | PN >10 µm std dev | ± | Subramaniam, Ajit | Continuous flow isotope ratio mass spectrometer (CF-IRMS), Micromass, Optima; coupled with Elemental analyser, Carlo Erba, NC2500 | Large T24 SD: Standard Deviation of Particulate Nitrogen in the >10µm size fraction at the end of incubation (time 24) |
| 23 | Nitrogen fixation rate, size fraction < 10 µm | N2 fix <10 µm | nmol/l/day | Subramaniam, Ajit | Calculated according to Montoya et al. (1996) | BNF small, avg: Average of Biological Nitrogen Fixation (BNF) of the <10µm size fraction. Detection limit 0.05 nmol N L-1 d-1 |
| 24 | Nitrogen fixation rate, size fraction < 10 µm, standard deviation | N2 fix <10 µm std dev | ± | Subramaniam, Ajit | Calculated according to Montoya et al. (1996) | BNF small SD: Standard Deviation of Biological Nitrogen Fixation (BNF) of the <10µm size fraction. Detection limit 0.05 nmol N L-1 d-1 |
| 25 | Nitrogen fixation rate, size fraction > 10 µm | N2 fix >10 µm | nmol/l/day | Subramaniam, Ajit | Calculated according to Montoya et al. (1996) | BNF large, avg: Average of Biological Nitrogen Fixation (BNF) of the >10µm size fraction. Detection limit 0.05 nmol N L-1 d-1 |
| 26 | Nitrogen fixation rate, size fraction > 10 µm, standard deviation | N2 fix >10 µm std dev | ± | Subramaniam, Ajit | Calculated according to Montoya et al. (1996) | BNF large SD: Standard Deviation of Biological Nitrogen Fixation (BNF) of the >10µm size fraction. Detection limit 0.05 nmol N L-1 d-1 |
| 27 | Nitrogen fixation rate, total | N2 fix total | nmol/l/day | Subramaniam, Ajit | Calculated according to Montoya et al. (1996) | BNF total, avg: Standard Deviation of Biological Nitrogen Fixation (BNF) of the sum of both size fractions. Detection limit 0.05 nmol N L-1 d-1 |
| 28 | Nitrogen fixation rate, total, standard deviation | N2 fix total std dev | ± | Subramaniam, Ajit | Calculated according to Montoya et al. (1996) | BNF total SD: Average of Biological Nitrogen Fixation (BNF) of the sum of both size fractions. Detection limit 0.05 nmol N L-1 d-1 |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1170 data points