Calibrating Broadband UV Instruments: Ozone and Solar Zenith Angle Dependence
| Autor: | Paul Johnston, Richard McKenzie, Barry A. Bodhaine, Ellsworth G. Dutton |
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| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | Journal of Atmospheric and Oceanic Technology. 15:916-926 |
| ISSN: | 1520-0426 0739-0572 |
| Popis: | A UV spectroradiometer was installed at Mauna Loa Observatory (MLO), Hawaii, in July 1995. This instrument has been employed to characterize several broadband UV instruments of a type commonly used to estimate erythemal irradiance at many sites around the globe. One year of clear-sky data from MLO has been analyzed for solar zenith angles (SZAs) of 5°–85°, in steps of 5°, and for total ozone values in the range 220–310 DU measured with a Dobson spectrophotometer. Because the spectral responses of various broadband instruments can be quite different, and particularly because the erythemal response defined for human skin is significantly different than that of many broadband instruments, the calibration of a broadband instrument reporting in erythemal units is strongly dependent on total ozone and SZA. When a broadband instrument is placed in the field it is necessary to know the calibration as a function of ozone and SZA to determine accurate erythemal irradiance. However, the manufacturers of bro... |
| Databáze: | OpenAIRE |
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