UV UV Spectroradiometer (Bentham DM300) at Lauder, New Zealand

A. Geddes, J. B. Liley, M. Kotkamp (NIWA) — Measurements of the spectral distribution of UV irradiance (285–450 nm) using a double monochromator since December 1989 and archived since 1991. In November 1993, the original UVL spectrometer (JYDH10), which allowed observations only in fair-weather conditions, was replaced by the UVM spectrometer (Bentham DM300). In September 1998, the integrating sphere on this instrument was replaced by a PTFE diffuser to allow all-weather observations, including during rain. There have been occasional periods of spectral sky radiance and spectral actinic flux observations. The latter also may be derived from spectral irradiance measurements. Direct beam spectral UV irradiance measurements have been made since 2011 (with the UV2 spectrometer). A variety of filter radiometers also have been used since 1992. Information regarding specific instruments and deployments are available from the PIs. Data through 2013 archived under former PI, McKenzie.