Continuous light absorption photometer for long-term studies
| Autor: | Elisabeth Andrews, Patrick J. Sheridan, John A. Ogren, Jim Wendell |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Detection limit
Atmospheric Science 010504 meteorology & atmospheric sciences business.industry Chemistry lcsh:TA715-787 lcsh:Earthwork. Foundations Analytical chemistry Photometer 010501 environmental sciences Light attenuation Continuous light 01 natural sciences Light absorption coefficient law.invention Aerosol lcsh:Environmental engineering Wavelength Optics law lcsh:TA170-171 business Absorption (electromagnetic radiation) 0105 earth and related environmental sciences |
| Zdroj: | Atmospheric Measurement Techniques, Vol 10, Pp 4805-4818 (2017) |
| ISSN: | 1867-8548 1867-1381 |
| Popis: | A new photometer for continuous measurements of aerosol light absorption coefficient, optimized for long-term studies of the climate-forcing properties of aerosols, is described. Measurements of the light attenuation coefficient are made at blue, green, and red wavelengths, with a detection limit of 0.02 Mm−1 and a precision of 4 % for hourly averages. The uncertainty of the light absorption coefficient is primarily determined by the uncertainty of the correction scheme commonly used to convert the measured light attenuation to light absorption coefficient, and ranges from about 20 % at sites with high loadings of strongly-absorbing aerosols up to 100 % or more at sites with low loadings of weakly-absorbing aerosols. Much lower uncertainties (ca. 40 %) for the latter case can be achieved with an advanced correction scheme. |
| Databáze: | OpenAIRE |
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