The influence of large woody debris (LWD) on in situ riverbed nitrogen transformations in the Hammer Stream (Hampshire, UK)
This dataset contains results from in situ field measurements of riverbed nitrogen transformations in the Hammer Stream, a sandy tributary of the River Rother in West Sussex, UK. Measurements were performed in November 2014 and February, April and July 2015. The data include baseline concentrations of nutrients (NO2, NO3, NH3, PO4), chloride, oxygen, pH, temperature, Fe(II), organic carbon, 15N-N2 and methane (CH4) and nitrous oxide (N2O) sampled from porewater prior to injection of 15N-nitrate. Full details about this dataset can be found at
https://doi.org/10.5285/7ded510f-3955-4b92-851d-29c0f79a0b99
INSPIRE
Identification
- File identifier
- 7ded510f-3955-4b92-851d-29c0f79a0b99 XML
- Resource type
- dataset
Online resource
Resource identifier
- Metadata Language
- English (en)
- Spatial representation type
- vector
Encoding
- Format
- Comma-separated values (CSV)
Projection
Classification of data and services
- Topic category
-
- Inland waters
Classification of data and services
Coupled resource
Coupled resource
Classification of data and services
Coupled resource
Coupled resource
Keywords
- GEMET - INSPIRE themes, version 1.0 ()
-
- Environmental Monitoring Facilities
Geographic coverage
N
S
E
W
Temporal reference
Temporal extent
Temporal extent
- Dataset Reference Date ()
- 2018-08-08
- Dataset Reference Date ()
- 2018-07-12
Quality and validity
- Lineage
- Prior to injection of 15N-nitrate, samples of porewater were recovered to measure background concentrations of nutrients (NO2, NO3, NH3, PO4), chloride, oxygen, pH, temperature, Fe(II), organic carbon, 15N-N2 and methane (CH4) and nitrous oxide (N2O). Concentration of dissolved oxygen in porewater sampled prior to 15N injection. Units are micro-M. Porewater was transferred from the collection syringe to an open syringe barrel containing an oxygen sensor via a 3-way valve. O2 concentrations were measured with a fast response microelectrode (50microm tip, Unisense). Readings from the microelectrode were displayed on a pico-ammeter (PA 2000; Unisense) and logged after 4s when the signal had stabilized. Calibration was performed with a zero solution (0.1M sodium ascorbate in 0.1M sodium hydroxide) and a solution of known O2 concentration (determined via Winkler titration). Through laboratory simulation with de-oxygenated water we estimate that O2 contamination during sample transfer and measurement was 10micro-M and have subtracted this value from the data. The limit of detection was 10micro-M and the precision was 2%. O2adj percent: Saturation of dissolved oxygen expressed relative to air-equilibrated water at the temperature of the sample. Units are %. The air-equilibrated O2 concentration was calculated for each sample using the Bunsen solubility coefficient for O2 and the temperature of the sample (determined during pH measurement, see below). O2 sat = 100 x O2adj (see above) divided by the air-equilibrated O2 concentration. pH of porewater sample prior to 15N injection. After the O2 concentration of the porewater was measured (see above) a calibrated pH probe (VWR 100) was placed in the solution and the temperature and pH was recorded. Temperature units are degrees centigrade. Water samples for nutrients were filtered through 0.45 micron filters (polypropylene). Samples for nutrient analysis were frozen at -20ºC before analysis. In the permeable sandy sediments, nitrate reduction was measured by 'push-pull' using techniques in Lansdown et al. (2014). In the main piezometer network described in Shelley et al (2017), a tracer containing 15N-labelled nitrate (300 micro-M (M), 98 atom percent 15N) in a de-oxygenated synthetic river water plus KCl matrix was injected into the riverbed and porewater samples recovered over time (Lansdown et al. (2014)). A helium headspace was added to the water samples, the 15N-labelled N2 content was determined by mass spectrometry. Data marked as 0 were below the detection limit of the method. Data marked ND were either no data collected or a sample lost.
Conformity
Conformity
Conformity
Conformity
Conformity
Conformity
Restrictions on access and use
- Access constraints
- no limitations
- Access constraints
- © Natural Environment Research Council
- Access constraints
- If you reuse this data, you should cite: Trimmer, M. (2018). The influence of large woody debris (LWD) on in situ riverbed nitrogen transformations in the Hammer Stream (Hampshire, UK). NERC Environmental Information Data Centre https://doi.org/10.5285/7ded510f-3955-4b92-851d-29c0f79a0b99
Responsible organization (s)
Contact for the resource
- Organisation name
- Queen Mary University of London
- enquiries@ceh.ac.uk
- Organisation name
- Queen Mary University of London
- enquiries@ceh.ac.uk
- Organisation name
- NERC Environmental Information Data Centre
- enquiries@ceh.ac.uk
- Organisation name
- NERC EDS Environmental Information Data Centre
- enquiries@ceh.ac.uk
Responsible organization (s)
Contact for the resource
- Organisation name
- Queen Mary University of London
- enquiries@ceh.ac.uk
- Organisation name
- Queen Mary University of London
- enquiries@ceh.ac.uk
- Organisation name
- NERC Environmental Information Data Centre
- enquiries@ceh.ac.uk
- Organisation name
- NERC EDS Environmental Information Data Centre
- enquiries@ceh.ac.uk
Metadata information
Contact for the metadata
- Organisation name
- NERC EDS Environmental Information Data Centre
- info@eidc.ac.uk
- Metadata Date
- 2024-02-13T09:31:15
- Metadata Language
- English (en)
- Character set
- utf8