Wasmund Norbert norbert.wasmund@io-warnemuende.de 0000-0002-7979-7176 2015 Depth integrated nitrogen fixation from the northern Benguela upwelling system during Maria S. Merain cruise MSM18/4 dataset https://doi.org/10.1594/PANGAEA.843444 2015-03-02T13:12:26 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. Wasmund Norbert norbert.wasmund@io-warnemuende.de 0000-0002-7979-7176 Struck Ulrich Ulrich.Struck@mfn.berlin https://www.geo.fu-berlin.de/geol/fachrichtungen/pal/mitarbeiter/assoziierte-wissenschaftler/struck/index.html Hansen A Grüttmüller A Flohr Anita anita.flohr@zmt-bremen.de http://www.zmt-bremen.de/Anita_Flohr.html 0000-0002-5018-5379 Nausch Günther guenther.nausch@io-warnemuende.de Voss Maren maren.voss@io-warnemuende.de 0000-0002-5827-9062 2015 Missing nitrogen fixation in the Benguela region 106 https://doi.org/10.1016/j.dsr.2015.10.007 30-41 8.0 13.58083 -17.24933 -10.497 11.10292090909091 -13.242906363636363 2011-07-28T04:12:00 2011-08-15T04:04:00 20.0 20.0 vertical profile GENUS Geochemistry and ecology of the Namibian upwelling system https://genus.cen.uni-hamburg.de/html/index.html Institute for Biogeochemistry and Marine Chemistry, Hamburg University IfBM http://www.ifbm.zmaw.de/ https://ror.org/00g30e956 Bundesministerium für Bildung und Forschung, Bonn BMBF https://www.bmbf.de https://doi.org/10.13039/501100002347 03F0650 Geochemistry and ecology of the Namibian upwelling system MSM18/4_790 AG11050 -10.99966 8.0 -4884.7 2011-07-28T04:12:00 MSM18/4 MSM18/4 Libreville ,Gabon 2011-07-24T00:00:00 2011-07-24 Walvis Bay, Namibia 2011-08-20T00:00:00 2011-08-20 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 Schmidt, Martin Schmidt, Martin doi:10.2312/expedition-msm18-4 20110349 hdl:10013/epic.44783.d017 hdl:10013/epic.44804.d059 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 CTD/Rosette CTD-RO CTD http://vocab.nerc.ac.uk/collection/L05/current/130/ CTD & XBT Water samplers CTD, drift net, Plankton net MSM18/4_795 AG14090 -13.99933 10.12266 -3889.8 2011-07-29T08:44:00 MSM18/4 MSM18/4 Libreville ,Gabon 2011-07-24T00:00:00 2011-07-24 Walvis Bay, Namibia 2011-08-20T00:00:00 2011-08-20 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 Schmidt, Martin Schmidt, Martin doi:10.2312/expedition-msm18-4 20110349 hdl:10013/epic.44783.d017 hdl:10013/epic.44804.d059 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 CTD/Rosette CTD-RO CTD http://vocab.nerc.ac.uk/collection/L05/current/130/ CTD & XBT Water samplers CTD, Plankton net, Satlantic, Secchi disc MSM18/4_802 IP_Na5 -15.094 12.10633 -67.7 2011-07-30T09:13:00 MSM18/4 MSM18/4 Libreville ,Gabon 2011-07-24T00:00:00 2011-07-24 Walvis Bay, Namibia 2011-08-20T00:00:00 2011-08-20 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 Schmidt, Martin Schmidt, Martin doi:10.2312/expedition-msm18-4 20110349 hdl:10013/epic.44783.d017 hdl:10013/epic.44804.d059 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 CTD/Rosette CTD-RO CTD http://vocab.nerc.ac.uk/collection/L05/current/130/ CTD & XBT Water samplers CTD, Dredge, multi net, Plankton net, Satlantic, Secchi disc Tucker trawl, van Veen grab MSM18/4_811 IP_Lo4 -12.333 13.43216 -99.4 2011-07-31T19:49:00 MSM18/4 MSM18/4 Libreville ,Gabon 2011-07-24T00:00:00 2011-07-24 Walvis Bay, Namibia 2011-08-20T00:00:00 2011-08-20 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 Schmidt, Martin Schmidt, Martin doi:10.2312/expedition-msm18-4 20110349 hdl:10013/epic.44783.d017 hdl:10013/epic.44804.d059 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 CTD/Rosette CTD-RO CTD http://vocab.nerc.ac.uk/collection/L05/current/130/ CTD & XBT Water samplers CTD, Dredge, drift net, multinet, Plankton net, Tucker trawl, van Veen grab MSM18/4_813 IP_Su5 -10.497 13.58083 -25.0 2011-08-01T11:20:00 MSM18/4 MSM18/4 Libreville ,Gabon 2011-07-24T00:00:00 2011-07-24 Walvis Bay, Namibia 2011-08-20T00:00:00 2011-08-20 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 Schmidt, Martin Schmidt, Martin doi:10.2312/expedition-msm18-4 20110349 hdl:10013/epic.44783.d017 hdl:10013/epic.44804.d059 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 CTD/Rosette CTD-RO CTD http://vocab.nerc.ac.uk/collection/L05/current/130/ CTD & XBT Water samplers CTD, Dredge, drift net, multinet, Plankton net, Satlantic,Secchi disc Tucker trawl, van Veen grab MSM18/4_816 IP_Su2 -10.50033 12.99916 -612.1 2011-08-01T20:48:00 MSM18/4 MSM18/4 Libreville ,Gabon 2011-07-24T00:00:00 2011-07-24 Walvis Bay, Namibia 2011-08-20T00:00:00 2011-08-20 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 Schmidt, Martin Schmidt, Martin doi:10.2312/expedition-msm18-4 20110349 hdl:10013/epic.44783.d017 hdl:10013/epic.44804.d059 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 CTD/Rosette CTD-RO CTD http://vocab.nerc.ac.uk/collection/L05/current/130/ CTD & XBT Water samplers CTD, drift net, multi net, Plankton net MSM18/4_827 AG10502 -10.5 11.84683 -1887.8 2011-08-04T05:12:00 MSM18/4 MSM18/4 Libreville ,Gabon 2011-07-24T00:00:00 2011-07-24 Walvis Bay, Namibia 2011-08-20T00:00:00 2011-08-20 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 Schmidt, Martin Schmidt, Martin doi:10.2312/expedition-msm18-4 20110349 hdl:10013/epic.44783.d017 hdl:10013/epic.44804.d059 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 CTD/Rosette CTD-RO CTD http://vocab.nerc.ac.uk/collection/L05/current/130/ CTD & XBT Water samplers CTD, drift net, multi net, Plankton net, Satlantic, Secchi disc MSM18/4_831 AG12502 -12.49916 10.86533 -3578.2 2011-08-04T21:28:00 MSM18/4 MSM18/4 Libreville ,Gabon 2011-07-24T00:00:00 2011-07-24 Walvis Bay, Namibia 2011-08-20T00:00:00 2011-08-20 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 Schmidt, Martin Schmidt, Martin doi:10.2312/expedition-msm18-4 20110349 hdl:10013/epic.44783.d017 hdl:10013/epic.44804.d059 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 CTD/Rosette CTD-RO CTD http://vocab.nerc.ac.uk/collection/L05/current/130/ CTD & XBT Water samplers CTD, drift net, multi net MSM18/4_837 AG15080 -14.99933 9.623 -4067.6 2011-08-06T04:13:00 MSM18/4 MSM18/4 Libreville ,Gabon 2011-07-24T00:00:00 2011-07-24 Walvis Bay, Namibia 2011-08-20T00:00:00 2011-08-20 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 Schmidt, Martin Schmidt, Martin doi:10.2312/expedition-msm18-4 20110349 hdl:10013/epic.44783.d017 hdl:10013/epic.44804.d059 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 CTD/Rosette CTD-RO CTD http://vocab.nerc.ac.uk/collection/L05/current/130/ CTD & XBT Water samplers CTD, drift net, multi net, Plankton net MSM18/4_842 AG17002 -17.00083 8.55583 -4752.2 2011-08-07T14:45:00 MSM18/4 MSM18/4 Libreville ,Gabon 2011-07-24T00:00:00 2011-07-24 Walvis Bay, Namibia 2011-08-20T00:00:00 2011-08-20 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 Schmidt, Martin Schmidt, Martin doi:10.2312/expedition-msm18-4 20110349 hdl:10013/epic.44783.d017 hdl:10013/epic.44804.d059 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 CTD/Rosette CTD-RO CTD http://vocab.nerc.ac.uk/collection/L05/current/130/ CTD & XBT Water samplers CTD, drift net, multi net, Plankton net MSM18/4_848 IP_Ku1 -17.24933 11.0 -2107.2 2011-08-15T04:04:00 MSM18/4 MSM18/4 Libreville ,Gabon 2011-07-24T00:00:00 2011-07-24 Walvis Bay, Namibia 2011-08-20T00:00:00 2011-08-20 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 Schmidt, Martin Schmidt, Martin doi:10.2312/expedition-msm18-4 20110349 hdl:10013/epic.44783.d017 hdl:10013/epic.44804.d059 Maria S. Merian https://en.wikipedia.org/wiki/RV_Maria_S._Merian DBBT 9274197 CTD/Rosette CTD-RO CTD http://vocab.nerc.ac.uk/collection/L05/current/130/ CTD & XBT Water samplers CTD, multi net, Plankton net 44 CC-BY-3.0 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/ Event label Event Event Optional event label Event 2 Event 2 Sample ID Sample ID Wasmund Norbert norbert.wasmund@io-warnemuende.de 0000-0002-7979-7176 Sample ID Latitude of event Latitude Latitude Longitude of event Longitude Longitude Date/Time of event Date/Time Date/Time DEPTH, water Depth water m depth http://purl.obolibrary.org/obo/PATO_0001595 water http://purl.obolibrary.org/obo/CHEBI_15377 Length L http://dbpedia.org/resource/Length Depth water [m] Depth, top/min Depth top m depth http://purl.obolibrary.org/obo/PATO_0001595 Length L http://dbpedia.org/resource/Length Wasmund Norbert norbert.wasmund@io-warnemuende.de 0000-0002-7979-7176 Depth top [m] Depth, bottom/max Depth bot m depth http://purl.obolibrary.org/obo/PATO_0001595 maximal max Length L http://dbpedia.org/resource/Length Wasmund Norbert norbert.wasmund@io-warnemuende.de 0000-0002-7979-7176 Depth bot [m] Nitrogen fixation rate, integrated per hour N fix int µmol/m**2/h nitrogen fixation rate integrated hour Molar Flux Calculated according to Montoya et al. (1996) https://doi.org/10.1128/aem.62.3.986-993.1996 Wasmund Norbert norbert.wasmund@io-warnemuende.de 0000-0002-7979-7176 N fix int [µmol/m**2/h] citable deNBIchemical author10586 author31359 author3503 author3504 author39365 author54006 author675 award2143 basis650 campaign3379863 campaign34989 event2741089 event2741094 event2741101 event2741110 event2741112 event2741115 event2741126 event2741130 event2741136 event2741141 event2741147 funder276 geocode1599 geocode1600 geocode1601 geocode1619 geocode8128 inst243 license101 method10923 method8784 param140696 param16065 param3 param4 pi3504 project4141 ref67488 term1073131 term2299371 term2606205 term33871 term38561 term41040 term42043 term43863 term44029 term49221 term67626 term68026 term77621 term77741 topotype3