Spectral solar UV monitoring: worth it?

Tapani Koskela; Anu Heikkilä; Jussi Kaurola; Anders Lindfors; Aapo Tanskanen; Peter den Outer

doi:10.1117/12.689760

12 October 2006 Spectral solar UV monitoring: worth it?

Tapani Koskela, Anu Heikkilä, Jussi Kaurola, Anders Lindfors, Aapo Tanskanen, Peter den Outer

Proceedings Volume 6362, Remote Sensing of Clouds and the Atmosphere XI; 63622A (2006) https://doi.org/10.1117/12.689760
Event: SPIE Remote Sensing, 2006, Stockholm, Sweden

Abstract

Monitoring of the terrestrial solar ultraviolet irradiance by using a radiometer is often considered as expensive and laborious or the data collected as insufficient in spatial coverage and in some cases in its temporal resolution, too. Therefore, alternative methods, all relying on modelling in one way or the other, have been developed. They differ in which input they receive, either standard meteorological information, space-based radiance measurements or ground-based irradiances from broadband or multiband UV radiometer or from pyranometer. A comparison of performance is presented between three methods during a 15-month period. The ground reference instrument is the Brewer Mk-III #107 spectroradiometer of the Observatory of Jokioinen, Finland. Compared to the reference, the space-based method overestimates the UV irradiance at noon by 14.6% and the pyranometer-based by 0.9% with root-mean-square differences of 35.5% and 10.4%, respectively. Daily erythemal doses agree by 3.8% for the space-based and 0.4% for the pyranometer-based method with a scatter of 16.5% and 4.6%, respectively. Spectral irradiances generated by the pyranometerbased model agree within 0.4% on average with a standard deviation of 17%. A rough estimate on the cost of each approach suggests that none of them is clearly superior to the others and the actual nature of the data needed may be used in decision making concerning monitoring strategies.

Citation Download Citation

Tapani Koskela, Anu Heikkilä, Jussi Kaurola, Anders Lindfors, Aapo Tanskanen, and Peter den Outer "Spectral solar UV monitoring: worth it?", Proc. SPIE 6362, Remote Sensing of Clouds and the Atmosphere XI, 63622A (12 October 2006); https://doi.org/10.1117/12.689760

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