Gray, E.; Jones, I.D.; Mackay, E.B.; Elliott, J.A.; Folkard, A.M.

Blelham Tarn: Ecological and chemical lake profiles, and inflow and outflow chemistry 2016-17

This dataset consists of physical, chemical and ecological water quality variables collected at Blelham Tarn during 2016-2017. Profiles for the following variables were collected on a weekly scale during the stratified period of the lake and fortnightly or monthly timescales outside of the stratified period; light, chlorophyll a (phytoplankton biomass proxy), temperature, specific conductivity, phycocyanin (cyanobacteria pigment), pH and oxygen (mg/l and percentage saturation). The secchi depth was also collected at the same sampling frequency. Phytoplankton taxonomy and biovolumes were collected at 1-6 m June-November 2016 at a weekly interval. Nutrient profiles (nitrogen, phosphorus and silica) were collected on a monthly timescale in June-October 2016. In addition to lake data, samples from three lake inflows and the outflow were collected for nutrients (nitrogen, phosphorus and silica) at monthly intervals along with discharge. Water level and water temperature were also recorded at a 15 minute frequency at one inflow and the outflow.

Publication date: 2019-11-19

Get the data

This dataset is available under the terms of the Open Government Licence

Format of the dataset : Comma-separated values (CSV)

You must cite: Gray, E.; Jones, I.D.; Mackay, E.B.; Elliott, J.A.; Folkard, A.M. (2019). Blelham Tarn: Ecological and chemical lake profiles, and inflow and outflow chemistry 2016-17. NERC Environmental Information Data Centre.


© Natural Environment Research Council

© UK Centre for Ecology & Hydrology

© Lancaster University


Study area
Temporal extent
2016-06-01    to    2017-12-31

Provenance & quality

Lake samples were collected at the lakes deepest point (14.5 m; see supporting information) and stream samples were collected at the same point in the closest accessible location to the lake (please see the relevant supporting information for further details and site maps). Laboratory analysis for nutrients, chlorophyll a and phytoplankton taxonomy were performed using standard procedures with full methodologies being outlined in the supporting information. All data has been checked visually and any obvious errors as a result of instrument error have been removed.

Supplemental information

This dataset is referenced in:

Gray, E., Elliott, J. A., Mackay, E. B., Folkard, A. M., Keenan, P. O., & Jones, I. D. (2019) Modelling lake cyanobacterial blooms: Disentangling the climate‐driven impacts of changing mixed depth and water temperature. Freshwater Biology. 64, 12, 2141-2155.
Gray, E., Mackay, E. B., Elliott, J. A., Folkard, A. M., & Jones, I. D. (2020). Wide-spread inconsistency in estimation of lake mixed depth impacts interpretation of limnological processes. Water Research, 168, 115136.

Correspondence/contact details

Dr. Emma Gray
Centre for Ecology & Hydrology
Lancaster Environment Centre, Library Avenue, Bailrigg
United Kingdom


Gray, E.
Centre for Ecology & Hydrology
Jones, I.D.
University of Stirling
Mackay, E.B.
Centre for Ecology & Hydrology
Elliott, J.A.
Centre for Ecology & Hydrology
Folkard, A.M.
Lancaster University

Other contacts

Environmental Information Data Centre
NERC Environmental Information Data Centre

Additional metadata

Topic categories
Environment , Inland Waters
Blelham Tarn,  England Environmental survey Lake District Water quality
Environmental Monitoring Facilities
Natural Environment Research Council Award: NEC05744 PhD project.
Spatial representation type
Tabular (text)
Spatial reference system
OSGB 1936 / British National Grid
Last updated
03 December 2019 08:45