Multisite Observations of Ultraviolet in Kobe City, Hyogo Prefecture

Relationships between Ultraviolet Intensity and Land Cover Morphology

Abstract

Simultaneous observations of ultraviolet radiation were conducted at multiple locations in the Kobe and Hanshin areas, covering various land types, including mountainous, residential, urban, and coastal areas, focusing on differences in the configuration of city blocks, such as the arrangement of structures and land cover. As a result, the ultraviolet（UV）intensity deviation from each observation point from 17:00 to 7:00 was not large（－0.5 to 0.5 mW/cm²）, but from 10:00 to 14:00 was－3.0 to 2.0 mW/cm². The difference in UV intensity between observation points was significant. Conversely, because the size of the UV deviation is related to the solar altitude, it is necessary to examine their relationship. Correlation analysis showed a positive and significant correlation（r = 0.74) between daily maximum UV anomaly and solar altitude.