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Data from the DIAPICNA cruise: Diazotrophic pico-cyanobacteria in the North Atlantic open ocean: their abundance and importance as a source of new nitrogen at the Azores Current Front
Citeerbaar als data publicatie
Riou, V.; Martins A.; Dehairs, F.; Prakya S. R.; Loureiro, C.; Santos, M; Alves, A. V.; (2015): Data from the DIAPICNA cruise: Diazotrophic pico-cyanobacteria in the North Atlantic open ocean: their abundance and importance as a source of new nitrogen at the Azores Current Front. https://doi.org/10.14284/40

Beschikbaarheid: Creative Commons License Deze dataset valt onder een Creative Commons Naamsvermelding 4.0 Internationaal-licentie.

Beschrijving
The data from this dataset was collected with the R/V NRP Dom Carlos I during Cruise No. DIAPICNA-OCE-2011-V01, which aimed at unfolding the inter-linkages between N2 and CO2 fixation mediated by diazotrophs in an area of the North Atlantic Ocean where Biological N2 Fixation (BNF) is suspected to be important meer

The Azores Current region close to the Mid-Atlantic Ridge, an oligotrophic area where contrasting conditions are found at the interface between temperate and subtropical waters, was investigated from the surface to 200m depth for geochemical indicators of N2-fixation as well as for the instantaneous N2 -fixation and CO2 -fixation rates, and the presence of unicellular diazotrophic cyanobacteria (UCYN), suspected to perform most of the N2 -fixation in the area. A South-North transect including 5 geographical sampling stations was sampled to evaluate the extent of biological N2 -fixation in the Azores Current/Front system (AzC/AzF), and to detect a potential influence of the nearby iron-rich "Rainbow" deep sea hydrothermal system. The results indicate that N2-fixation would support a large part of the CO2 -fixation in the whole area, and that the UCYN abundance may not be related with N2 -fixation activity. Diapycnal diffusion of nutrients and plankton seems enhanced by the numerous eddies generated in this area, probably regulating the growth and activity of C- and N2 -fixers

Scope
Thema's:
Watersamenstelling > Nutrienten
Kernwoorden:
Marien/Kust, Fytoplankton, Unicellular Cyanobacteria (UCYN), ANE, Azores

Geografische spreiding
ANE, Azores [Marine Regions]

Spreiding in de tijd
25 Juli 2011 - 3 Augustus 2011

Parameters
Abundance of N2 fixers per size fraction Methode , Ammonium Methode , Carbon uptake (primary production) Methode , Dinitrogen uptake (N2 fixation) Methode , Fosfaat (PO43-) Methode , Nitraat (NO3-) Methode , Opgeloste zuurstof Methode , Particulaire organische koolstof Methode , Particulate organic nitrogen (PON) Methode , Saliniteit Methode , Silicic acid Methode , Stable C (d13C) isotopic composition of suspended organic matter Methode , Stable N (d15N) isotopic composition of suspended organic matter Methode , Watertemperatuur Methode
Abundance of N2 fixers per size fraction: Fluorescence In Situ Hybridization (FISH)
Ammonium: Colorimetry; QUAATRO analyser
Carbon uptake (primary production): Isotope enrichment experiments
Dinitrogen uptake (N2 fixation): Isotope enrichment experiments
Fosfaat (PO43-): Colorimetry; QUAATRO analyser
Nitraat (NO3-): Colorimetry; QUAATRO analyser
Opgeloste zuurstof: Winkler Method
Particulaire organische koolstof: Elemental Analysis
Isotope Ratio Mass Spectrometry (EA-IRMS)
Particulate organic nitrogen (PON): Elemental Analysis
Isotope Ratio Mass Spectrometry (EA-IRMS)
Saliniteit: CTD measurements
Silicic acid: Colorimetry; QUAATRO analyser
Stable C (d13C) isotopic composition of suspended organic matter: Elemental analyser - isotope ratio mass spectrometer
Stable N (d15N) isotopic composition of suspended organic matter: Elemental analyser - isotope ratio mass spectrometer
Watertemperatuur: CTD measurements

Bijdrage door
Marinha Portuguesa, meerdata creator
The National Center for Scientific Research; Institut National de Science de l'Univers; Centre d'Océanologie de Marseille; Mediterranean Institute of Oceanography (M.I.O.), meerdata creator
University of the Azores (UAC), meerdata creator
Vrije Universiteit Brussel (VUB), meerdata creator

Project
DIAPICNA: Diazotrophic pico-cyanobacteria in the North Atlantic open ocean: their abundance and importance as a source of new nitrogen at the Azores Current Front, meer

Publicatie
Gebaseerd op deze dataset
Riou, V. et al. (2016). Importance of N2-fixation on the productivity at the north-western Azores current/front system, and the abundance of diazotrophic unicellular cyanobacteria. PLoS One 11(3): e0150827. https://dx.doi.org/10.1371/journal.pone.0150827, meer
Beschrijft deze dataset
Riou, V. et al. (2011). EUROFLEETS Cruise Summary Report. Project DIAPICNA: DIAzotrophic PIco-Cyanobacteria in the North Atlantic open ocean: their abundance and importance as a source of new nitrogen at the Azores Front/Current. R/V NRP Dom Carlos I, Cruise No. DIAPICNA-OCE-2011-V01, 25/07/2011 – 03/08/2011, Horta (Portugal). Vrije Universiteit Brussel/Universidade dos Açores: Brussel, Horta. 13 pp., meer

Dataset status: Afgelopen
Data type: Data
Data oorsprong: Onderzoek: veldonderzoek
Metadatarecord aangemaakt: 2015-10-26
Informatie laatst gewijzigd: 2016-07-01
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