Shaw G E
Appl Opt. 1982 Jun 1;21(11):2006-11. doi: 10.1364/AO.21.002006.
A radiometer was operated at the Mauna Loa Observatory during calendar year 1980 to estimate the spectral irradiance of the sun and its possible fluctuation in time near the peak of solar activity. Data were also acquired on seasonal trends of atmospheric transmissivity above the marine mixing layer in the central Pacific. Spectral irradiance remained constant to at least (1/2)% at all wavelengths monitored. Furthermore its absolute magnitude was in agreement with the Labs and Neckel values to +/-2% except at blue wavelengths where the Mauna Loa values are from 4 to 12% higher and at lambda = 850 nm where the Mauna Loa value is 9% lower. The residual aerosol optical depth above Mauna Loa Observatory during 1980 averaged tau(0) = 0.020. An intrusion of dust into the central Pacific from the Gobi Desert (as deduced by the composition of collected particles) invaded the Central Pacific from Mar. to May 1980 and caused a perturbation in optical depth (at lambda = 500 nm) of Deltatau(0) ~ 0.01-0.02. The optical depth increment caused by the Mt. St. Helens volcano was <0.005 in the 2-month period following the eruption.
1980年全年，一台辐射计在莫纳罗亚天文台运行，以估算太阳的光谱辐照度及其在太阳活动高峰期附近随时间的可能波动。还获取了中太平洋海洋混合层上方大气透过率的季节性趋势数据。在所有监测波长下，光谱辐照度至少保持恒定在（1/2）%。此外，其绝对值与拉布斯和内克尔的值一致，误差在+/-2%以内，但在蓝光波长处除外，莫纳罗亚的值比其高4%至12%，在λ = 850纳米处，莫纳罗亚的值低9%。1980年莫纳罗亚天文台上方的残余气溶胶光学厚度平均为τ(0)= 0.020。来自戈壁沙漠的沙尘侵入中太平洋（根据收集到的颗粒成分推断），于1980年3月至5月侵入中太平洋，导致光学厚度（在λ = 500纳米处）出现Δτ(0)~ 0.01 - 0.02的扰动。圣海伦斯火山喷发后两个月内，其造成的光学厚度增量<0.005。
