non-parametric and least squares langley plot methods
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ID: 128601
2016
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Abstract
Langley plots are used to calibrate sun radiometers primarily for the
measurement of the aerosol component of the atmosphere that attenuates
(scatters and absorbs) incoming direct solar radiation. In principle, the
calibration of a sun radiometer is a straightforward application of the
Bouguer–Lambert–Beer law V = V0e−τ ⋅ m, where a plot of ln(V)
voltage vs. m air mass yields a straight line with intercept ln(V0). This ln(V0) subsequently can be used to solve for τ for any
measurement of V and calculation of m. This calibration works well on some high
mountain sites, but the application of the Langley plot calibration
technique is more complicated at other, more interesting, locales. This
paper is concerned with ferreting out calibrations at difficult sites and
examining and comparing a number of conventional and non-conventional
methods for obtaining successful Langley plots. The 11 techniques
discussed indicate that both least squares and various non-parametric
techniques produce satisfactory calibrations with no significant differences
among them when the time series of ln(V0)'s are smoothed and interpolated with
median and mean moving window filters.
| Reference Key |
kiedron2016atmosphericnon-parametric
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|---|---|
| Authors | ;P. W. Kiedron;J. J. Michalsky |
| Journal | bioorganic & medicinal chemistry |
| Year | 2016 |
| DOI |
10.5194/amt-9-215-2016
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| URL | |
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