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Atmospheric and Oceanic Optics

2018 year, number 9

Daily variation in the radiation extinction coefficient due to midges and its dependence on meteorological parameters of the atmosphere under background conditions of summer of Western Siberia

N.N. Shchelkanov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: атмосфера, коэффициент ослабления, гнус, суточный ход, лето, метеорологические параметры, Западная Сибирь, atmosphere, extinction coefficient, midges, daily course, summer, meteorological parameters, Western Siberia

Abstract

It is shown that the daily variation in the radiation extinction coefficient due to midges (RECM) has a morning statistically significant maximum at 09:00. This maximum is not connected with extremes of air temperature or relative humidity. The RECM maxima are observed at air temperature of 12-17 °C and relative humidity of 60-80%. Correlations between RECM and air temperature and relative humidity are statistically significant. Straight line inclination coefficients in RECM dependences on air temperature and relative humidity are -0.04 km-1/5 °C and +0.04 km-1/20%, respectively. It is revealed that the RECM maxima are observed at winds of 2-4 m/s directed from boggy forest sites, and minima, at winds of 1-4 m/s from the Ob River and dry mixed and pine forests