Computer Science
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9219534k&link_type=abstract
Unknown
Computer Science
Atmospheric Composition, Cloud Cover, Oscillations, Ozone, Solar Cycles, Solar Radiation, Sunlight, Ultraviolet Radiation, Aerosols, Alps Mountains (Europe), Clearing, Stratosphere, United States, Volcanoes
Scientific paper
During solar cycle 21 (1976-86), the primary solar irradiance at approx. 300 nm was steady during 1980-82, and thereafter decreased up to 1986 by only approx. 2-3 percent. The stratospheric ozone in middle latitudes had a quasi-biennial oscillation (QBO) of approx. 3-4 percent in this interval, but the long term ozone trend was less than 3 percent per decade, which could result in a UVB increase of only approx. 5-6 percent per decade. Thus, the combined effect of changes in the primary solar irradiance and ozone changes could be an increase of 5-6 percent in UVB observed at ground during 1977-81 and a steady level during 1981-86. During 1976-86, the average cloudiness changed by less than 5 percent, indicating UVB changes of 5 percent or less on this count. The aerosol level was almost constant during 1976-82 and increased abruptly in 1982 due to the El Chichon eruption and decayed slowly up to 1986. Thus, due to aerosols only, the UVB was expected to be constant during 1976-82, decrease sharply in 1982, and recoup slowly thereafter. Measurements of clear sky solar UVB at ground made at Jungfraujoch (Swiss Alps, 47 degrees N, 8 degrees E) during 1981-89 and at Rockville, USA (39 degrees N, 77 degrees W) were not comparable between themselves and did not follow the above expected patterns. Neither did the all-day meter UVB measurements at Philadelphia, USA (40 degrees N, 75 degrees W) and Minneapolis, USA (45 degrees N, 93 degrees W). We suspect that some of these measurements are erroneous. This needs further detailed scrutiny.
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