de.pangaea.dataset843444 und dataset PANGAEA
info@pangaea.de
https://www.pangaea.de/ information pointOfContact 2026-04-29T19:12:18Z https://doi.pangaea.de/10.1594/PANGAEA.843444 <gco:CharacterString>Depth integrated nitrogen fixation from the northern Benguela upwelling system during Maria S. Merain cruise MSM18/4</gco:CharacterString> 2015-03-02T13:12:26 publication https://doi.org/10.1594/PANGAEA.843444 Wasmund, Norbert
norbert.wasmund@io-warnemuende.de
https://orcid.org/0000-0002-7979-7176 information author PANGAEA
info@pangaea.de
https://www.pangaea.de/ information publisher tableDigital Nitrogen fixation data from the cruise number MSM18/4 with research vessel "Maria S. Merian" from 24.07.-20.08.2011 (from Libreville to Walvis Bay) in front of Angola and northern Namibia. Samples taken by CTD- rosette sampler from different depths and incubated in glass bottles (535 ml) at light intensities that resemble the in situ light intensities of the sampling depth after Delta 15 N2 gas was injected to the sample. After the incubation time of 6 hours, the complete bottle content was filtered onto a pre-combusted Whatman GF/F filter. Filters were frozen, transported to the institute on dry ice and measured in a mass spectrometer for Delta15N. The principle of the method was described by Montoya et al. (1996) and calculation was done according to their spread sheet. From the data of the single depths, the nitrogen fixation per square meter within the upper 40 m of the water column was calculated. The methods are described in detail in a paper submitted by Wasmund et al. in 2014 to be printed in 2015. Some results are surprisingly below zero. This occurs if the Delta15N of the blank is higher than the measurement after incubation. It indicates that no nitrogen fixation occurred. Due to natural variability, the variability of the nitrogen fixation data is high. In an overall estimate, also over several cruises, negative and positive values compensate more or less, suggesting that nitrogen fixation is insignificant in the waters in front of northern Namibia and southern Angola. completed Wasmund, Norbert
norbert.wasmund@io-warnemuende.de
https://orcid.org/0000-0002-7979-7176 information principalInvestigator GENUS Geochemistry and ecology of the Namibian upwelling system theme <gco:CharacterString>PANGAEA Project List</gco:CharacterString> 1995-01-01 creation PANGAEA
info@pangaea.de
https://www.pangaea.de/ information pointOfContact copyright copyright CC-BY-3.0: Creative Commons Attribution 3.0 Unported textTable und geoscientificInformation 8.0 13.58083 -17.24933 -10.497 2011-07-28T04:12:00 2011-08-15T04:04:00 20.0 20.0 Event label thematicClassification Optional event label thematicClassification Sample ID thematicClassification Latitude of event thematicClassification Longitude of event thematicClassification Date/Time of event thematicClassification DEPTH, water physicalMeasurement m m Depth, top/min physicalMeasurement m m Depth, bottom/max physicalMeasurement m m Nitrogen fixation rate, integrated per hour physicalMeasurement Calculated according to Montoya et al. (1996) µmol/m**2/h µmol/m**2/h text/tab-separated-values unknown https://doi.pangaea.de/10.1594/PANGAEA.843444?format=textfile download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. EVENT LABEL: MSM18/4_790 (AG11050) * LATITUDE: -10.999660 * LONGITUDE: 8.000000 * DATE/TIME: 2011-07-28T04:12:00 * ELEVATION: -4884.7 m * CAMPAIGN: MSM18/4 * BASIS: Maria S. Merian * METHOD/DEVICE: CTD/Rosette CTD, drift net, Plankton net 2011-07-28T04:12:00 EVENT LABEL: MSM18/4_795 (AG14090) * LATITUDE: -13.999330 * LONGITUDE: 10.122660 * DATE/TIME: 2011-07-29T08:44:00 * ELEVATION: -3889.8 m * CAMPAIGN: MSM18/4 * BASIS: Maria S. Merian * METHOD/DEVICE: CTD/Rosette CTD, Plankton net, Satlantic, Secchi disc 2011-07-29T08:44:00 EVENT LABEL: MSM18/4_802 (IP_Na5) * LATITUDE: -15.094000 * LONGITUDE: 12.106330 * DATE/TIME: 2011-07-30T09:13:00 * ELEVATION: -67.7 m * CAMPAIGN: MSM18/4 * BASIS: Maria S. Merian * METHOD/DEVICE: CTD/Rosette CTD, Dredge, multi net, Plankton net, Satlantic, Secchi disc Tucker trawl, van Veen grab 2011-07-30T09:13:00 EVENT LABEL: MSM18/4_811 (IP_Lo4) * LATITUDE: -12.333000 * LONGITUDE: 13.432160 * DATE/TIME: 2011-07-31T19:49:00 * ELEVATION: -99.4 m * CAMPAIGN: MSM18/4 * BASIS: Maria S. Merian * METHOD/DEVICE: CTD/Rosette CTD, Dredge, drift net, multinet, Plankton net, Tucker trawl, van Veen grab 2011-07-31T19:49:00 EVENT LABEL: MSM18/4_813 (IP_Su5) * LATITUDE: -10.497000 * LONGITUDE: 13.580830 * DATE/TIME: 2011-08-01T11:20:00 * ELEVATION: -25.0 m * CAMPAIGN: MSM18/4 * BASIS: Maria S. Merian * METHOD/DEVICE: CTD/Rosette CTD, Dredge, drift net, multinet, Plankton net, Satlantic,Secchi disc Tucker trawl, van Veen grab 2011-08-01T11:20:00 EVENT LABEL: MSM18/4_816 (IP_Su2) * LATITUDE: -10.500330 * LONGITUDE: 12.999160 * DATE/TIME: 2011-08-01T20:48:00 * ELEVATION: -612.1 m * CAMPAIGN: MSM18/4 * BASIS: Maria S. Merian * METHOD/DEVICE: CTD/Rosette CTD, drift net, multi net, Plankton net 2011-08-01T20:48:00 EVENT LABEL: MSM18/4_827 (AG10502) * LATITUDE: -10.500000 * LONGITUDE: 11.846830 * DATE/TIME: 2011-08-04T05:12:00 * ELEVATION: -1887.8 m * CAMPAIGN: MSM18/4 * BASIS: Maria S. Merian * METHOD/DEVICE: CTD/Rosette CTD, drift net, multi net, Plankton net, Satlantic, Secchi disc 2011-08-04T05:12:00 EVENT LABEL: MSM18/4_831 (AG12502) * LATITUDE: -12.499160 * LONGITUDE: 10.865330 * DATE/TIME: 2011-08-04T21:28:00 * ELEVATION: -3578.2 m * CAMPAIGN: MSM18/4 * BASIS: Maria S. Merian * METHOD/DEVICE: CTD/Rosette CTD, drift net, multi net 2011-08-04T21:28:00 EVENT LABEL: MSM18/4_837 (AG15080) * LATITUDE: -14.999330 * LONGITUDE: 9.623000 * DATE/TIME: 2011-08-06T04:13:00 * ELEVATION: -4067.6 m * CAMPAIGN: MSM18/4 * BASIS: Maria S. Merian * METHOD/DEVICE: CTD/Rosette CTD, drift net, multi net, Plankton net 2011-08-06T04:13:00 EVENT LABEL: MSM18/4_842 (AG17002) * LATITUDE: -17.000830 * LONGITUDE: 8.555830 * DATE/TIME: 2011-08-07T14:45:00 * ELEVATION: -4752.2 m * CAMPAIGN: MSM18/4 * BASIS: Maria S. Merian * METHOD/DEVICE: CTD/Rosette CTD, drift net, multi net, Plankton net 2011-08-07T14:45:00 EVENT LABEL: MSM18/4_848 (IP_Ku1) * LATITUDE: -17.249330 * LONGITUDE: 11.000000 * DATE/TIME: 2011-08-15T04:04:00 * ELEVATION: -2107.2 m * CAMPAIGN: MSM18/4 * BASIS: Maria S. Merian * METHOD/DEVICE: CTD/Rosette CTD, multi net, Plankton net 2011-08-15T04:04:00 Related to <gco:CharacterString>Missing nitrogen fixation in the Benguela region</gco:CharacterString> 2015-01-01 publication https://doi.org/10.1016/j.dsr.2015.10.007 Wasmund, Norbert
norbert.wasmund@io-warnemuende.de
https://orcid.org/0000-0002-7979-7176 information author Struck, Ulrich
Ulrich.Struck@mfn.berlin
https://www.geo.fu-berlin.de/geol/fachrichtungen/pal/mitarbeiter/assoziierte-wissenschaftler/struck/index.html information author Hansen, A author Grüttmüller, A author Flohr, Anita
anita.flohr@zmt-bremen.de
https://orcid.org/0000-0002-5018-5379 information author Nausch, Günther
guenther.nausch@io-warnemuende.de
author Voss, Maren
maren.voss@io-warnemuende.de
https://orcid.org/0000-0002-5827-9062 information author documentDigital 106 30-41