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Choisnard, Noémie; Böttcher, Michael Ernst; Liskow, Iris; Schmiedinger, Iris; Voss, Maren (2024): Nitrate d15N and d18O, and water d2H and d18O stable isotopes of METEOR cruise M174 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.965429

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Abstract:
The Amazon River is known as a region of intense biochemical reactivity. As a result of increased anthropogenic impacts in its catchment (e.g. population growth, agriculture, and deforestation), The Amazon River is undergoing fundamental changes. The RV METEOR cruise M174 (doi:10.1594/PANGAEA.935041) aimed to provide an integrated overview of nitrogen cycling processes in areas influenced by the Amazon River, which is crucial to estimate the ecosystem's health and productivity. During this cruise, six stations were visited to explore the significance of denitrification as a dominant pathway in the watercolumn of the Amazon and Pará estuaries. This dataset presents the stable isotopic composition of nitrate (d15N- d18O-NO3), as well as d2H and d18O of ambient water.
Keyword(s):
Amazon; Amazon estuary; Amazon River; d15N; d18O; d2H; M174; nitrate; Stable isotopes; water
Supplement to:
Choisnard, Noémie; Umbricht, Jacqueline; Araujo, Moacyr; Böttcher, Michael Ernst; Burmeister, Christian; Liskow, Iris; Schmiedinger, Iris; Voss, Maren (accepted): Nitrogen assimilation and recycling in surface waters of the Amazon and Pará Estuaries. Journal of Geophysical Research: Oceans
Funding:
Deutsche Forschungsgemeinschaft, Bonn (DFG), grant/award no. 439440452: Metabolismus des Stickstoffs in der Amazonasfahne und dem westlichen, tropischen Nordatlantik (MeNARP)
Coverage:
Median Latitude: 0.661243 * Median Longitude: -48.371965 * South-bound Latitude: -0.597550 * West-bound Longitude: -48.839570 * North-bound Latitude: 1.612580 * East-bound Longitude: -47.731100
Date/Time Start: 2021-04-23T06:27:57 * Date/Time End: 2021-04-27T11:40:39
Minimum Elevation: -36.0 m * Maximum Elevation: -14.0 m
Event(s):
M174_9-2 * Latitude: -0.121680 * Longitude: -47.731100 * Date/Time: 2021-04-23T06:27:57 * Elevation: -36.0 m * Location: South Atlantic Ocean * Campaign: M174 * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
M174_10-2 * Latitude: -0.597550 * Longitude: -48.260520 * Date/Time: 2021-04-23T15:16:37 * Elevation: -14.0 m * Location: South Atlantic Ocean * Campaign: M174 * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
M174_12-2 * Latitude: 0.596830 * Longitude: -48.373770 * Date/Time: 2021-04-24T11:30:01 * Elevation: -15.0 m * Location: South Atlantic Ocean * Campaign: M174 * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventChoisnard, Noémie
2Latitude of eventLatitudeChoisnard, Noémie
3Longitude of eventLongitudeChoisnard, Noémie
4Date/Time of eventDate/TimeChoisnard, Noémie
5Temperature, waterTemp°CChoisnard, NoémieCTD, Sea-Bird, SBE 911plusITS-90
6SalinitySalChoisnard, NoémieCTD, Sea-Bird, SBE 911plusPSU
7Nitrate[NO3]-µmol/lChoisnard, NoémieMethods of Seawater Analysis, 3rd edition (Grasshoff et al., 1999)
8Nitrate, standard deviationNO3 std dev±Choisnard, NoémieCalculated
9δ15N, nitrateδ15N NO3‰ airChoisnard, NoémieAccording to Sigman et al. (2001) and Weigand et al. (2016)Weigand et al. (2016; doi:10.1002/rcm.7570)
10δ15N, nitrate, standard deviationδ15N NO3 std dev±Choisnard, NoémieCalculated
11δ18O, nitrateδ18O NO3Choisnard, NoémieAccording to Sigman et al. (2001) and Weigand et al. (2016)Weigand et al. (2016; doi:10.1002/rcm.7570)
12δ18O, nitrate, standard deviationδ18O NO3 std dev±Choisnard, NoémieCalculated
13δ18O, waterδ18O H2O‰ SMOWChoisnard, NoémieAccording to Böttcher & Schmiedinger (2021)
14δ18O, water, standard deviationδ18O H2O std dev±Choisnard, NoémieCalculated
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
60 data points

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