Other
Scientific paper
Dec 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972natur.240..545p&link_type=abstract
Nature, Volume 240, Issue 5383, pp. 545-547 (1972).
Other
2
Scientific paper
MONITORING of solar radiation at the Mauna Loa Observatory is part of a benchmark programme which was initiated at the beginning of the International Geophysical Year on January 1, 1958. The geographic and topographic location of the Observatory greatly enhances the quality of the measurements. At an elevation of 3.4 km, the optical path is reduced to about two-thirds of its magnitude at sea level, and at a latitude of 19.32° N, the Sun at solar noon is almost vertically overhead with a zenith angle of less than 4° on 125 consecutive days annually. Hawaii's location, generally upwind of the other islands of the Hawaiian chain and about 3,700 km from the nearest continent, assures that only longlived substances from any but local sources can affect the solar radiation monitored on Mauna Loa. Perturbations of atmospheric opacities from local sources are minimized by a 30 km distance from only sparsely populated civilization centres and the absence of heavy industries anywhere on the island. Frequent orographic rainfalls (about 400 cm annually) to the windward and over existing pollution sources provide a natural cleansing mechanism. The marine trade inversion is usually found below the elevation of the Observatory and traps most of the particulate matter emitted into the atmosphere from local terrestrial sources. Finally, during several hours after sunrise, the monitoring site is exposed to dry, clean descending air from higher elevations in the course of a thermally induced diurnal mountain circulation.
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