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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
Citable as data publication
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. http://dx.doi.org/10.14284/40

Availability: Creative Commons License This dataset is licensed under a Creative Commons Attribution 4.0 International License.

Description
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 more

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
Themes:
Water composition > Nutrients
Keywords:
Marine, Phytoplankton, Unicellular Cyanobacteria (UCYN), ANE, Azores

Geographical coverage
ANE, Azores [Marine Regions]

Temporal coverage
25 July 2011 - 3 August 2011

Parameters
Abundance of N2 fixers per size fraction Methodology , Ammonium (NH4+) Methodology , Carbon uptake (primary production) Methodology , Dinitrogen uptake (N2 fixation) Methodology , Dissolved oxygen (O2) Methodology , Nitrate (NO3-) Methodology , Particulate organic carbon (POC) Methodology , Particulate organic nitrogen (PON) Methodology , Phosphate (PO43-) Methodology , Salinity Methodology , Silicic acid Methodology , Stable C (d13C) isotopic composition of suspended organic matter Methodology , Stable N (d15N) isotopic composition of suspended organic matter Methodology , Water temperature Methodology
Abundance of N2 fixers per size fraction: Fluorescence In Situ Hybridization (FISH)
Ammonium (NH4+): Colorimetry; QUAATRO analyser
Carbon uptake (primary production): Isotope enrichment experiments
Dinitrogen uptake (N2 fixation): Isotope enrichment experiments
Dissolved oxygen (O2): Winkler Method
Nitrate (NO3-): Colorimetry; QUAATRO analyser
Particulate organic carbon (POC): Elemental Analysis
Isotope Ratio Mass Spectrometry (EA-IRMS)
Particulate organic nitrogen (PON): Elemental Analysis
Isotope Ratio Mass Spectrometry (EA-IRMS)
Phosphate (PO43-): Colorimetry; QUAATRO analyser
Salinity: 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
Water temperature: CTD measurements

Contributors
Marinha Portuguesa, moredata 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.), moredata creator University of the Azores (UAC), moredata creator Vrije Universiteit Brussel (VUB), moredata 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, more

Publication
Based on this 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. dx.doi.org/10.1371/journal.pone.0150827, more
Describing this 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., more

Dataset status: Completed
Data type: Data
Data origin: Research: field survey
Metadatarecord created: 2015-10-26
Information last updated: 2016-07-01
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