Measuring and Visualizing Solar UV for a Wide Range of Atmospheric Conditions on Hawai’i Island

Forrest M. Mims, Andrew J. S. McGonigle, Thomas C. Wilkes, Alfio V. Parisi, William B. Grant, Joseph M. Cook and Tom D. Pering
Additional contact information
Forrest M. Mims: Geronimo Creek Observatory, 433 Twin Oak Road, Seguin, TX 78155, USA
Andrew J. S. McGonigle: Department of Geography, University of Sheffield, Sheffield S10 2TN, UK
Thomas C. Wilkes: Department of Geography, University of Sheffield, Sheffield S10 2TN, UK
Alfio V. Parisi: Faculty of Health, Engineering and Sciences, University of Southern Queensland, Toowoomba, QLD 4350, Australia
William B. Grant: Sunlight, Nutrition, and Health Research Center, P.O. Box 641603, San Francisco, CA 94164-1603, USA
Joseph M. Cook: Department of Geography, University of Sheffield, Sheffield S10 2TN, UK
Tom D. Pering: Department of Geography, University of Sheffield, Sheffield S10 2TN, UK

IJERPH, 2019, vol. 16, issue 6, 1-24

Abstract: Hawai’i Island often receives extreme (UV Index ≥ 11) solar ultraviolet radiation (UVR). While the UV Index (UVI) has been measured since 1997 at Hawai’i’s high-altitude Mauna Loa Observatory (MLO), measurements where people live and recreate are rare. We measured UVI on the face of a rotating mannequin head with UVR sensors at its eyes, ears and cheeks while simultaneously measuring the UVI with a zenith-facing sensor at MLO and seven sites at or near sea level from 19 July to 14 August 2018. The mannequin sensors received higher UVR at midmorning and midafternoon than at noon. For example, at sea level the peak UVI at the left cheek was 5.2 at midmorning and 2.9 at noon, while the horizontal UVI at noon was 12.7. Our measurements were supplemented with wide-angle (190° and 360°) sky photographs and UV images of the mannequin head. Because the UVI applies to horizontal surfaces, people in tropical and temperate latitudes should be informed that their face may be more vulnerable to UVR at midmorning and midafternoon than at noon. Finally, our instruments provided opportunities to measure unexpected UVR-altering events, including rare biomass smoke over MLO and spectroscopic measurements of substantial UVR-absorbing sulfur dioxide in the eruption plume of the Kilauea volcano.

Keywords: Hawai’i; Mauna Loa Observatory; Kilauea; ultraviolet; UV Index; ozone; sulfur dioxide; smoke (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
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