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Variations in UV radiation in Chile

S Cabrera1, S Bozzo, H Fuenzalida

  • 1Department of Cellular Biology and Genetics, Faculty of Medicine, University of Chile, Santiago.

Journal of Photochemistry and Photobiology. B, Biology
|May 1, 1995
PubMed
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This study reports the first UV global radiation measurements in Chile across various latitudes and altitudes. Urban air pollution significantly impacts UV levels, particularly in winter, while altitudinal increments are lower than in Europe.

Area of Science:

  • Atmospheric science
  • Solar radiation physics

Background:

  • UV global radiation is a critical environmental factor.
  • Understanding its variations is essential for environmental and health studies.
  • Chile's diverse geography presents unique conditions for UV radiation research.

Purpose of the Study:

  • To report the first UV global radiation measurements in Chile.
  • To analyze latitudinal and altitudinal variations of UV radiation.
  • To investigate the impact of urban air pollution on UV levels.

Main Methods:

  • Utilized a portable multichannel radiometer to measure UV radiation at four wavelengths (305, 320, 340, 380 nm).
  • Conducted observations across latitudes from 18°S to 53°S, encompassing summer and winter conditions.

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  • Compared coastal, valley, and Andean summit measurements to estimate altitudinal increments.

    • Main Results:

    • Observed significant latitudinal variations in daily maximum UV radiation.
    • Santiago's measurements showed deviations from the expected latitudinal profile due to urban air pollution, reducing UV ground levels, especially in winter.
    • Altitudinal increments in UV radiation were estimated, with lower values (4%-10% per km) in rural areas compared to Europe.
    • Andean summits in desert regions exhibited very low altitudinal increments (≤2%).
    • Diurnal variations indicated an increase in UV radiation height increment from morning to evening.

    Conclusions:

    • Chile's UV radiation profile is influenced by latitude, altitude, and urban air pollution.
    • Urban pollution acts as a significant attenuator of UV solar radiation.
    • Altitudinal UV radiation increments in Chile are generally lower than those reported in Europe, particularly in high-altitude desert regions.