Attenuation of global ultraviolet and visible irradiance over Greece during the total solar eclipse
نویسنده
چکیده
The variability of ultraviolet and photosynthetically active radiation during the total solar eclipse of 29 March 2006 was examined in this study. The measurements from NILU-UV multichannel actinometers at 7 stations of the Greek UV Network were used, where the maximum eclipse percentage ranged from 73.1% to 94.8%. In addition, 5 an extra instrument was established at a remote Greek island, Kastelorizo, which was within the Moon's umbral shadow. The measured changes in UV and visible irradiance were compared with 1-D model calculations (accounting for the limb darkening effect) and differences up 30% were observed for the lower UV wavelengths at high eclipse percentages. The spectral ratios between wavelengths was generally reproduced by 10 the 1-D model, expect for 305 nm, where the irradiance at eclipse percentages of more than 85% decreased with slower rates than for longer wavelengths. As a result, the total ozone, derived from the 305/320 nm ratio, apparently decreased significantly for high eclipse percentages. Comparison results with 3-D model calculations approaching and during totality revealed an agreement with measurements in the UV-A region.
منابع مشابه
Attenuation of irradiance during solar eclipse
Attenuation of global ultraviolet and visible irradiance over Greece during the total solar eclipse of 29 March 2006 A. Kazantzidis, A. F. Bais, C. Emde, S. Kazadzis, and C. S. Zerefos Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece Institut für Physik der Atmosphäre, Deutsches Zentrum für Luftund Raumfahrt (DLR), Oberpfaffenhofen, 82234 Wessling, G...
متن کاملAttenuation of global ultraviolet and visible irradiance over Greece
The variability of ultraviolet and photosynthetically active radiation (PAR) during the total solar eclipse of 29 March 2006 was examined in this study. The measurements from NILU-UV multichannel radiometers at 7 stations of the Greek UV Network were used, where the maximum eclipse percentage ranged from 73.1% to 94.8%. In addition, an extra instrument was established at a remote Greek island, ...
متن کاملInteractive comment on “Attenuation of global ultraviolet and visible irradiance over Greece
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Interactive comment on “Attenuation of global ultraviolet and visible irradiance over Greece
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Interactive comment on “Attenuation of global ultraviolet and visible irradiance over Greece
Comment of the referee: [My main criticism of the paper is that it lacks a Discussion Section where the authors interpret their results and compare them with similar observations that have already been published. For example, why is UV radiation decreasing more rapidly than the visible fraction of the Sun (Page 13483, Line 14)? In addition, reasons explaining the pattern of the irradiance ratio...
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