Comparison of measured and modeled stratospheric UV/visible actinic fluxes at large solar zenith angles

Statistics – Applications

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Atmospheric Composition And Structure, Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry

Scientific paper

Measured and modeled stratospheric filter sensitivity weighted ultraviolet/visible (UV/vis) actinic fluxes-approximating the NO2 photolysis rate coefficients (jNO2)-are compared. The measurements were performed with two calibrated 2π-actinometers assembled on the azimuth angle-controlled LPMA/DOAS (Laboratoire de Physique Moléculaire et Applications/Differential Optical Absorption Spectroscopy) gondola during a series of balloon flights. Since the actinometer's spectral sensitivity curve did not exactly match the actinic spectrum of NO2 and the skylight's spectrum shape changes with atmospheric height and solar illumination, only proxies (proxy-)jNO2 rather than true jNO2 values were monitored during balloon ascents (0-30 km) for solar zenith angle (SZA)75°

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