A new parameterization of the UV irradiance altitude dependence for clear-sky conditions and its application in the on-line UV tool over Northern Eurasia
| Autor: | Yelena Nezval, Yekaterina Zhdanova, Nataly Ye. Chubarova |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Atmospheric Science
Number density 010504 meteorology & atmospheric sciences Correlation coefficient media_common.quotation_subject Irradiance Albedo Atmospheric sciences 01 natural sciences Standard deviation lcsh:QC1-999 Aerosol 010309 optics lcsh:Chemistry Altitude lcsh:QD1-999 Sky 0103 physical sciences Environmental science lcsh:Physics 0105 earth and related environmental sciences media_common Remote sensing |
| Zdroj: | Atmospheric Chemistry and Physics, Vol 16, Pp 11867-11881 (2016) |
| ISSN: | 1680-7324 1680-7316 |
| Popis: | A new method for calculating the altitude UV dependence is proposed for different types of biologically active UV radiation (erythemally weighted, vitamin-D-weighted and cataract-weighted types). We show that for the specified groups of parameters the altitude UV amplification (AUV) can be presented as a composite of independent contributions of UV amplification from different factors within a wide range of their changes with mean uncertainty of 1 % and standard deviation of 3 % compared with the exact model simulations with the same input parameters. The parameterization takes into account for the altitude dependence of molecular number density, ozone content, aerosol and spatial surface albedo. We also provide generalized altitude dependencies of the parameters for evaluating the AUV. The resulting comparison of the altitude UV effects using the proposed method shows a good agreement with the accurate 8-stream DISORT model simulations with correlation coefficient r > 0.996. A satisfactory agreement was also obtained with the experimental UV data in mountain regions. Using this parameterization we analyzed the role of different geophysical parameters in UV variations with altitude. The decrease in molecular number density, especially at high altitudes, and the increase in surface albedo play the most significant role in the UV growth. Typical aerosol and ozone altitude UV effects do not exceed 10–20 %. Using the proposed parameterization implemented in the on-line UV tool (http://momsu.ru/uv/) for Northern Eurasia over the PEEX domain we analyzed the altitude UV increase and its possible effects on human health considering different skin types and various open body fraction for January and April conditions in the Alpine region. |
| Databáze: | OpenAIRE |
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