| Monitoring summer solar ultraviolet (UV) radiation on the ground level over Ardabil-Sarein, NW Iran |
| Paper ID : 1026-GEOSPATIAL (R7) |
| Authors: |
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Roghayeh Jahdi *1, Mahdi Arabi2 1University of Mohaghegh Ardabili, Faculty of Agriculture and Natural Resources, Ardabil, I.R. Iran 2Shahid Rajaee Teacher Training University, Tehran, I.R. Iran |
| Abstract: |
| The UV radiation level at the Earth’s surface is modified by temporal, geographical, and meteorological factors. The first observations of solar UV radiation ever made in NW Iran, obtained in June 2019 are reported in this work. The analysis of hourly values of UV irradiances measured in the study area reveals significant diurnal variation during daylight hours, with lower values in the morning and afternoon and higher around noon. Mean hourly UV (A+B) ranged from 2755 to 10434 μW/cm2 with an average value being about 7960 μW/cm2. Mean hourly UV (C) ranged from 40 to 91 μW/cm2 with an average value being about 76 μW/cm2. The results of a short but intense measurement campaign in Ardabil-Sarein indicate the trends for geographical latitude, longitude, and altitude from surface UV measurements. The UV intensity is associated with geographical longitude (r2= 0.15 for UV (A+B); r2= 0.13 for UV (C)). Furthermore, UV intensity varies with the local latitude in the study area. There is a strong linear relationship between mean UV and altitude and a rising trend in UV is observed with an increase in altitude. A decrease in UV radiation with increasing solar zenith angle (°) has been observed. However, the association of UV radiation with solar azimuth angle (°) was not significant. Understanding the factors that affect UV radiation near the earth’s surface by making systematic ground-based measurements of UV radiation is to determine whether long-term changes are occurring as a result of changes in cloud cover or climate change and to identify specific causes. |
| Keywords: |
| Earth’s Surface, Solar UV Radiation, Temporal, Geographical Location, Solar Zenith Angle. |
| Status : Paper Accepted (Poster Presentation) |
