Physics – Optics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apopt..21.2006s&link_type=abstract
Applied Optics, vol. 21, June 1, 1982, p. 2006-2011.
Physics
Optics
22
Aerosols, Atmospheric Attenuation, Atmospheric Scattering, Irradiance, Solar Spectra, Transmissivity, Atmospheric Optics, Light Scattering, Optical Thickness, Pacific Ocean, Solar Activity Effects
Scientific paper
A radiometer was operated at the Mauna Loa Observatory (MLO) during 1980 to estimate the spectral irradiance of the sun and its possible fluctuation in time near the peak of solar activity. Data were also collected on seasonal trends of atmospheric transmissivity above the marine mixing layer in the central Pacific. Spectral irradiance remained constant to at least 1/2% of all wavelengths monitored. Its absolute magnitude was in agreement with the Labs and Neckel values to + or - 2% except at blue wavelenghts where the MLO values are from 4 to 12% higher and at a wavelength of 850 nm where the MLO value is 9% lower. The background atmospheric optical depth arising from absorption and scattering from aerosol above Mauna Loa averaged 0.020 + or 0.005 at a wavelength of 500 nm, but an enhancement in the extinction occurred from March to May, attributable to desert soil particles transported across the Pacific Ocean from the region of the Gobi desert.
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