SEASONAL CHARACTERISTICS OF HAZE OBSERVED BY CONTINUOUS VISIBILITY MONITORING IN THE URBAN ATMOSPHERE OF KWANGJU, KOREA

摘要

Continuous visibility monitoring has been carried out in Kwangju, Korea since May 1999. The total light extinction coefficient b_ext measured by a transmissometer and reveals seasonal trends In urban visual air quality, especially under hazy conditions with a visual range of less than 15 km. Seasonal atmospheric visibility under low relative humidity during the winter was observed to the Better than during and order seasons. Summertime visibility was severely degraded due to highly Increased light scattering by hygroscopic particles under high humidity atmospheric conditions.