Methodology:

The spectroradiometer measures spectral global irradiance between 280 and 600 nm (wavelengths from below UV-B to the middle of the visible range) with a step size of 0.5 nm and a resolution of 1 nm. Scans are recorded at various time intervals depending on the time of day and season peaking at every 30 minutes while the sun is above the horizon from the beginning of September until the end of April.

Data are stored in four pairs of Oracle tables. One member of each pair holds the spectral data while the other member holds all the metadata concerned with each scan. The four pairs hold reference data (calibration lamp irradiance values, action spectra, spectral response functions etc.), wavelength calibration data, irradiance calibration data and measurements of spectral irradiance. The tables are owned by u_hp and are called: spec_ref_data, spec_ref_info, spec_wlcal_data,spec_wlcal_info, spec_ircal_data, spec_ircal_info, spec_measurements, spec_measurements_info.

In August 2001 the spectroradiometer was destroyed by a laboratory fire. A new instrument was installed in February 2003. These data are stored in the oracle tables new_spec_wlcal_data, new_spec_wlcal_info, new_spec_ircal_data, new_spec_ircal_info, new_spec_measurements, new_spec_measurements_info. As the exact day of the data collection was not provided, and the metadata standard requires a YYYY-MM-DD format, this dataset has been dated as 1st February.

Data collection:

The manufacturer of the instrument used is:

Bentham Instruments Ltd

2 Boulton Road

Reading

Berkshire

RG2 0NH

England

Tel: 0118 975 1355

Fax: 0118 931 2971

Email: info@bentham.co.uk

Data quality:

Calibrated

Data having undergone full calibration procedures.