EMODnet product catalogue
Nutrient data collected during the iMAR 2021/Eurofleets+ research cruise in Mid Atlantic Ridge (Azores EEZ)
This dataset was produced during the iMAR cruise “The Integrated assessment of the distribution of Vulnerable Marine Ecosystem along the Mid-Atlantic Ridge (MAR) in the Azores region”, that took place aboard the Research Vessel Pelagia of the Royal Netherlands Institute for Sea Research between May 18th and June 2nd 2021. The iMAR cruise aimed to evaluate the role of the MAR in shaping latitudinal and trans-Atlantic patterns in deep-sea biogeography, connectivity and assemblages of deep-sea megafauna. This expedition was funded by the SEA OCEANS program of Eurofleets+ and the H2020 European project iAtlantic, and was led by the University of the Azores (Portugal) in collaboration with the Hydrographic Institute and University of Porto (Portugal), the University of Aarhus (Denmark), the National Oceanography Center (United Kingdom), GEOMAR (Germany), the University Museum of Bergen (Norway), the PP Shirshov Institute of Oceanology (Russia), and the University of Vale do Itajaí (Brazil). Nutrient analysis was performed according to Grasshoff et al, adopted for a 5 channel continues flow analyzer (Skalar San Plus, Skalar Analytical B. V., Breda, The Netherlands). Nitrite and nitrate+nitrite was measured using an ammonia buffer and sulfanilamide/alpha-Naphthylethylene diamine dihydrochloride colour reagent in phosphoric acid, with reduction of nitrate to nitrite by cadmium column of at least 80% measured reduction capacity (90-100% achieved), followed by quantification with spectrophotometric determination of the nitrite-azo dye at 540 nm. Nitrate was determined as the difference between nitrate+nitrite and nitrite measurements. Ammonia was measured using a citrate/tartrate buffer and phenol color reagent, catalyzed by hypochlorite and nitroprusside , followed by quantification with spectrophotometric determination of the phenol-ammonia complex at 630 nm. Phosphate samples reacted with antimo nytartrate and ammonium molybdate solution in sulfuric acidified solution, the resulting complex wasreduced by ascorbic acid to a deep blue dye, followed by quantification with spectrophotometric determination of the reduced antimony-phospho-molybdate complex at 880 nm. Silicate samples was acidified with sulfuric acid and reacted with ammonium molybdate solution, reduced by ascorbic acid to a blue dye with oxalic acid to remove phosphate interference , followed by quantification with spectrophotometric determination of the reduced molybdo-silicate complex at 810 nm. Methods used are accredited with expected detection limit of 0,04 µM for nitrite, 0,1 µM for nitrate, 0,3 µM for ammonia, 0,06 µM for Phosphate and 0,2 µM for silicate, with expected RSD between 4 and 7%for the individual nutrients. Certified reference materials (VKI type QC RW1 for ammonia, phosphate and nitrate) and internal reference materials for Nitrite and silicate was spiked at two levels to natural low nutrient seawater sample for quality assurance, recovering 91-109% of the spike for nitrite, nitrate, phosphate and silicate at with RSD% of 1 to 5%, and recovery of 84-91% for ammonia, with RSDs up to 15%. No corrections was performed on data the recoveries. Except for ammonia, all results was within the acceptance limits for accredited analysis. Analysis was performed over two runs, one with triplicates and then a fourth spare sample was included to investigate the ammonia instability, but it could not be determined if this was due to storage/transport or instrument The “.CSV” files of fully processed data contain data collected mainly in the North portion of the MAR in the Exclusive Economic Zone around the Azores.
Important Note: This submission has been initially submitted to SEA
scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI.
The metadata elements have been further processed (refined) in EMODnet
Ingestion Service in order to conform with the Data Submission Service
specifications.
Simple
- Date (Creation)
- 2022-04-22
- Date (Revision)
- 2022-05-13
- Date (Publication)
- 2022-06-16
- Date (Publication)
- 2022-06-22
- Citation identifier
- a53ad03f-3836-8363-3631-000000086115
- Code
- DOI:10.17882/86115
- Other citation details
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Mohn Christian, Larsen Martin Mørk, Evans Susan, Neves De Sousa Laura, Rodrigues Luis, Dominguez-Carrió Carlos, Taranto Gerald H., Carreiro-Silva Marina, Morato Telmo (2022). Nutrient data collected during the iMAR 2021/Eurofleets+ research cruise in Mid Atlantic Ridge (Azores EEZ). SEANOE. https://doi.org/10.17882/86115
- Point of contact
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Organisation name Individual name Electronic mail address Role SEA scieNtific Open data Edition Publisher Ifremer, Scientific Information Systems for the sea Dataset Holding Organisation National Institute of Oceanography and Applied Geophysics - OGS, Division of Oceanography Author
- Keywords
-
- Access constraints
- Other restrictions
- Other constraints
- no limitations to public access
- Use limitation
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Conditions for access and use apply
- Use constraints
- Other restrictions
- Other constraints
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CC-BY 4.0
- Character set
- UTF8
- Topic category
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- Oceans
- Begin date
- 2021-05-19
- End date
- 2021-06-02
))
- Unique resource identifier
- WGS 1984
Spatial representation info
- Distribution format
-
Name Version Delimited 1
- OnLine resource
-
Protocol Linkage Name WWW:DOWNLOAD-1.0-http--download
https://cloud.emodnet-ingestion.eu/index.php/s/gVGKpjtqtMcmZVr WWW:LINK-1.0-http--link
https://cdi.seadatanet.org/search/welcome.php?query=2317&query_code={02C4D483-6BD6-4211-8C6E-F6BB46BBE969} WWW:LINK-1.0-http--link
https://cdi-chemistry.seadatanet.org/search/welcome.php?query=2317&query_code={02C4D483-6BD6-4211-8C6E-F6BB46BBE969}
- Hierarchy level
- Dataset
Conformance result
- Title
-
COMMISSION REGULATION (EC) No 1205/2008 of 3 December 2008 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards metadata
- Date (Publication)
- 2010-12-08
- Explanation
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See the referenced specification
- Pass
- No
Conformance result
- Title
-
Corrigendum to INSPIRE Metadata Regulation published in the Official Journal of the European Union, L 328, page 83
- Date (Publication)
- 2010-12-08
- Explanation
-
See the referenced specification
- Pass
- No
Conformance result
- Title
-
Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
- Date (Publication)
- 2010-12-08
- Explanation
-
See the referenced specification
- Pass
- No
- Statement
-
Raw data
Metadata
- File identifier
- a53ad03f-3836-8363-3631-000000086115 XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Date stamp
- 2025-05-21T00:00:00
- Metadata standard name
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ISO 19115:2003/19139
- Metadata standard version
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1.0
- Metadata author
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Organisation name Individual name Electronic mail address Role University of Azores, Institute of Marine Sciences Point of contact
)))
