The selected data set is described below with metadata. Access to the data set itself can be requested via the SeaDataNet portal that gives an overview and access to marine and ocean data sets acquired and managed by European organisations. Go to: https://www.seadatanet.org
Details
| What? | ||||||||||
| Data set name | EUROFLEETS+ Nutrients iMAR cruise 2021 (station: St81) | |||||||||
| Discipline | ||||||||||
| Parameter groups | ||||||||||
| Discovery parameter |
| |||||||||
| GEMET-INSPIRE themes | Oceanographic geographical features | |||||||||
| Abstract | 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 004 µM for nitrite 01 µM for nitrate 03 µM for ammonia 006 µM for Phosphate and 02 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. https://doi.org/10.17882/86115 | |||||||||
| Data format |
| |||||||||
| Data set creation date | 20220620 | |||||||||
| Where? | ||||||||||
| Map |
© OpenStreetMap contributors
| |||||||||
| Latitude | 39.2943 | |||||||||
| Longitude | -29.703199999999999 | |||||||||
| Datum | World Geodetic System 84 | |||||||||
| Measuring area type | point | |||||||||
| Water depth (m) | 881 | |||||||||
| Depth reference | mean sea level | |||||||||
| Minimum instrument depth (m) | 8.5 | |||||||||
| Maximum instrument depth (m) | 881 | |||||||||
| Sea regions | ||||||||||
| Location qualification | Beyond the 12 NM boundary | |||||||||
| Ices areas | Azores | |||||||||
| MSFD areas | North East Atlantic Ocean | |||||||||
| Ospar areas | Wider Atlantic | |||||||||
| When? | ||||||||||
| Start date | 20210601 | |||||||||
| End date | 20210601 | |||||||||
| How? | ||||||||||
| Instrument/gear category | ||||||||||
| Platform type | ||||||||||
| Cruise name | St81 | |||||||||
| Alternative cruise name | 496268 | |||||||||
| Cruise start date | 20210601 | |||||||||
| Cruise Summary Report (CSR) | EF+SEA01-007_iMAR - Pelagia(64PE) | |||||||||
| Who? | ||||||||||
| Data originator | Aarhus University, Department of Bioscience, Marine Ecology Aarhus Hydrographic Institute National Oceanography Centre (Southampton) University of Azores, Department of Oceanography and Fisheries (IMAR network) | |||||||||
| Data custodian | National Institute of Oceanography and Applied Geophysics - OGS, Division of Oceanography | |||||||||
| Project name | EUROFLEETS+ - EUROFLEETS+: An Alliance of European marine research infrastructure to meet the evolving needs of the research and industrial communities (research project) | |||||||||
| How to get data? | ||||||||||
| Data Distributor | National Institute of Oceanography and Applied Geophysics - OGS, Division of Oceanography | |||||||||
| Database reference | ||||||||||
| Access/ordering of data | web data access with registration | |||||||||
| Access restriction | ||||||||||
| Other info | ||||||||||
| Quality info |
| |||||||||
| Lineage | The data centres apply standard data quality control procedures on all data that the centres manage. Ask the data centre for details. | |||||||||
| CDI-metadata | ||||||||||
| CDI-record id | 3401780 | |||||||||
| Version | 0 | |||||||||
| CDI-record initial import date | 2022-06-20 13:32:55.630 | |||||||||
| CDI-record last update | 2022-06-20 13:32:56.990 | |||||||||
| Point of contact | National Institute of Oceanography and Applied Geophysics - OGS, Division of Oceanography |