50f4344e-a79a-4e1f-a9ee-e7985ed847cd English ISO/IEC 8859-1 (also known as Latin 1) dataset dataset NERC EDS Environmental Information Data Centre Lancaster Environment Centre, Library Avenue, Bailrigg Lancaster LA1 4AP UK info@eidc.ac.uk https://eidc.ac.uk/ EIDC website The Environmental Information Data Centre (EIDC) is the UK's national data centre for terrestrial and freshwater sciences. information pointOfContact 2025-11-13T16:15:02 UK GEMINI 2.3 OSGB 1936 / British National Grid Biogeochemistry and phytoplankton data from Loch Etive, Scotland, October 2022 2025-07-24 publication https://catalogue.ceh.ac.uk/id/50f4344e-a79a-4e1f-a9ee-e7985ed847cd 10.5285/50f4344e-a79a-4e1f-a9ee-e7985ed847cd doi: Grant, A.L., Arrowsmith, C., Barry, C., Bowes, M.J., Callaghan, N., Eades, L.J., Fournier, I., Hendry, K., Mawji, E., O'Brien, A., Olszewska, J.P., Pickard, A.E., Tandy, S., Spears, B.M. (2025). Biogeochemistry and phytoplankton data from Loch Etive, Scotland, October 2022. NERC EDS Environmental Information Data Centre 10.5285/50f4344e-a79a-4e1f-a9ee-e7985ed847cd This dataset contains biogeochemical measurements of surface water, sampled across Loch Etive, Scotland, between the 3rd and 7th of October 2022. The dataset encompasses 23 locations including nine open loch stations, four fish-farm adjacent loch sites, six river inflows, and four process experiment river sites, enabling a comparison of water chemistry across marine, freshwater, and anthropogenically influenced environments. Surface water samples were collected and analysed for an extensive range of biogeochemical parameters. In-field measurements included water temperature, pH, dissolved oxygen, and specific conductivity. Laboratory analyses comprised: - Alkalinity - Major nutrients, including nitrate, nitrite, ammonium, soluble reactive phosphorus (SRP), and silica - Dissolved and total organic and inorganic carbon and nitrogen (DOC, TIC, TDN) - Trace elements and rare earth elements (REEs), including lithium, barium, aluminium, and a full suite of lanthanides - Stable isotope composition of oxygen (δ18O), determined via isotope ratio mass spectrometry - Chromophoric and fluorescent dissolved organic matter (CDOM/FDOM), with derived indices such as fluorescence index (FI), biological index (BIX), and humification index (HIX) In addition to water chemistry, particulate samples were collected and analysed for total suspended solids (TSS), particulate organic matter (POM), particulate inorganic matter (PIM), chlorophyll-a concentration, and particulate organic carbon/nitrogen (POC/PON). Phytoplankton community composition was assessed by flow cytometry, quantifying major groups including diatoms, pico- and nano-chlorophytes, cryptophytes, and cyanobacteria. This comprehensive dataset is intended to inform biogeochemical process understanding in polar analogue environments and to validate analytical workflows and inter-institutional protocols. Full details about this dataset can be found at https://doi.org/10.5285/50f4344e-a79a-4e1f-a9ee-e7985ed847cd Grant, A. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk pointOfContact Grant, A.L. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk https://orcid.org/0009-0005-7203-3260 ORCID record ORCID is an open, non-profit, community-driven effort to create and maintain a registry of unique researcher identifiers and a transparent method of linking research activities and outputs to these identifiers. information author Arrowsmith, C. British Geological Survey caar@bgs.ac.uk https://orcid.org/0000-0003-3849-5179 ORCID record ORCID is an open, non-profit, community-driven effort to create and maintain a registry of unique researcher identifiers and a transparent method of linking research activities and outputs to these identifiers. information author Barry, C. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk author Bowes, M.J. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk https://orcid.org/0000-0002-0673-1934 ORCID record ORCID is an open, non-profit, community-driven effort to create and maintain a registry of unique researcher identifiers and a transparent method of linking research activities and outputs to these identifiers. information author Callaghan, N. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk https://orcid.org/0000-0003-0273-6161 ORCID record ORCID is an open, non-profit, community-driven effort to create and maintain a registry of unique researcher identifiers and a transparent method of linking research activities and outputs to these identifiers. information author Eades, L.J. University of Edinburgh Lorna.Eades@ed.ac.uk author Fournier, I. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk https://orcid.org/0000-0002-0065-2338 ORCID record ORCID is an open, non-profit, community-driven effort to create and maintain a registry of unique researcher identifiers and a transparent method of linking research activities and outputs to these identifiers. information author Hendry, K. British Antarctic Survey kathen@bas.ac.uk https://orcid.org/0000-0002-0790-5895 ORCID record ORCID is an open, non-profit, community-driven effort to create and maintain a registry of unique researcher identifiers and a transparent method of linking research activities and outputs to these identifiers. information author Mawji, E. National Oceanography Centre ezm@noc.ac.uk https://orcid.org/0000-0002-9860-1351 ORCID record ORCID is an open, non-profit, community-driven effort to create and maintain a registry of unique researcher identifiers and a transparent method of linking research activities and outputs to these identifiers. information author O'Brien, A. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk https://orcid.org/0000-0002-8742-0010 ORCID record ORCID is an open, non-profit, community-driven effort to create and maintain a registry of unique researcher identifiers and a transparent method of linking research activities and outputs to these identifiers. information author Olszewska, J.P. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk https://orcid.org/0000-0002-4910-2206 ORCID record ORCID is an open, non-profit, community-driven effort to create and maintain a registry of unique researcher identifiers and a transparent method of linking research activities and outputs to these identifiers. information author Pickard, A.E. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk https://orcid.org/0000-0003-1069-3720 ORCID record ORCID is an open, non-profit, community-driven effort to create and maintain a registry of unique researcher identifiers and a transparent method of linking research activities and outputs to these identifiers. information author Tandy, S. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk https://orcid.org/0000-0003-0662-0991 ORCID record ORCID is an open, non-profit, community-driven effort to create and maintain a registry of unique researcher identifiers and a transparent method of linking research activities and outputs to these identifiers. information author Spears, B.M. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk https://orcid.org/0000-0002-0876-0405 ORCID record ORCID is an open, non-profit, community-driven effort to create and maintain a registry of unique researcher identifiers and a transparent method of linking research activities and outputs to these identifiers. information author UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk owner NERC EDS Environmental Information Data Centre info@eidc.ac.uk custodian NERC EDS Environmental Information Data Centre info@eidc.ac.uk publisher Hydrography theme GEMET - INSPIRE themes, version 1.0 2008-06-01 publication biogeochemistry chlorophyll fish farming isotope metal nutrient river transport water quality GEMET - Concepts, version 4.1.3 2019-01-28 creation Water quality Loch Etive Scotland otherRestrictions no limitations otherRestrictions This resource is available under the terms of the Open Government Licence otherRestrictions If you reuse this data, you should cite: Grant, A.L., Arrowsmith, C., Barry, C., Bowes, M.J., Callaghan, N., Eades, L.J., Fournier, I., Hendry, K., Mawji, E., O'Brien, A., Olszewska, J.P., Pickard, A.E., Tandy, S., Spears, B.M. (2025). Biogeochemistry and phytoplankton data from Loch Etive, Scotland, October 2022. NERC EDS Environmental Information Data Centre https://doi.org/10.5285/50f4344e-a79a-4e1f-a9ee-e7985ed847cd textTable English utf8 environment 2022-10-03 2022-10-07 -5.453 -4.965 56.362 56.618 Comma-separated values (CSV) NERC EDS Environmental Information Data Centre info@eidc.ac.uk distributor https://data-package.ceh.ac.uk/data/50f4344e-a79a-4e1f-a9ee-e7985ed847cd Download the data Download a copy of this data download https://data-package.ceh.ac.uk/sd/50f4344e-a79a-4e1f-a9ee-e7985ed847cd.zip Supporting information Supporting information available to assist in re-use of this dataset information dataset dataset 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 2010-12-08 Surface water was collected via grab sampling at 23 sites across loch, river, and fish farm locations. In situ parameters were measured immediately using a HACH HQ4300 multimeter with calibrated pH, conductivity, and dissolved oxygen probes. Vacuum filtration units and portable pumps were used for sample processing. Samples were transported to the lab within 6 hours for processing. Nutrient concentrations were measured using segmented flow analysis; DOC, TIC, and TDN by thermal oxidation and chemiluminescence; metals and REEs by ICP-MS and ICP-OES; δ18O via isotope mass spectrometry. Phytoplankton were quantified using flow cytometry; particulate analyses followed gravimetric and spectrophotometric methods. Units include: Temperature (°C), pH (unitless), DO (mg/L, % saturation), conductivity (mS/cm) Nutrients: µmol/L or µg/L (e.g. nitrate, phosphate) DOC/TIC/TDN: mg/L Metals: µg/L or ppm Particulates: mg/L Phytoplankton: cells/mL CFDOM indices: Raman units or unitless indices (FI, HIX, BIX) Raw readings were calibrated and corrected; fluorescence data were processed in R; compiled data include site metadata and documented exclusions. Calibrations, reference standards, replicates, blanks, and internal controls were used. Analytical QA procedures were followed across all labs. Some data are missing due to instrument errors or lost samples. Not all parameters were measured at all sites.