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首页> 外文期刊>Atmospheric chemistry and physics >Reconstruction and analysis of erythemal UV radiation time series from Hradec Králové (Czech Republic) over the past 50 years
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Reconstruction and analysis of erythemal UV radiation time series from Hradec Králové (Czech Republic) over the past 50 years

机译：赫拉德茨·克拉洛韦（捷克共和国）近50年红斑紫外线辐射时间序列的重建和分析

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This paper evaluates the variability of erythemal ultraviolet (EUV) radiation from Hradec Králové (Czech Republic) in the period 1964–2013. The EUV radiation time series was reconstructed using a radiative transfer model and additional empirical relationships, with the final root mean square error of 9.9?%. The reconstructed time series documented the increase in EUV radiation doses in the 1980s and the 1990s (up to 15?% per decade), which was linked to the steep decline in total ozone (10?% per decade). The changes in cloud cover were the major factor affecting the EUV radiation doses especially in the 1960s, 1970s, and at the beginning of the new millennium. The mean annual EUV radiation doses in the decade 2004–2013 declined by 5?%. The factors affecting the EUV radiation doses differed also according to the chosen integration period (daily, monthly, and annually): solar zenith angle was the most important for daily doses, cloud cover, and surface UV albedo for their monthly means, and the annual means of EUV radiation doses were most influenced by total ozone column. The number of days with very high EUV radiation doses increased by 22?% per decade, the increase was statistically significant in all seasons except autumn. The occurrence of the days with very high EUV doses was influenced mostly by low total ozone column (82?% of days), clear-sky or partly cloudy conditions (74?% of days) and by increased surface albedo (19?% of days). The principal component analysis documented that the occurrence of days with very high EUV radiation doses was much affected by the positive phase of North Atlantic Oscillation with an Azores High promontory reaching over central Europe. In the stratosphere, a strong Arctic circumpolar vortex and the meridional inflow of ozone-poor air from the southwest were favorable for the occurrence of days with very high EUV radiation doses. This is the first analysis of the relationship between the high EUV radiation doses and macroscale circulation patterns, and therefore more attention should be given also to other dynamical variables that may affect the solar UV radiation on the Earth surface.
机译：本文评估了赫拉德茨·克拉洛维（捷克共和国）在1964年至2013年期间的红斑紫外线（EUV）辐射的变异性。使用辐射转移模型和其他经验关系重建EUV辐射时间序列，最终均方根误差为9.9？％。重建的时间序列记录了1980年代和1990年代EUV辐射剂量的增加（每十年高达15％），这与总臭氧量的急剧下降（每十年10％）有关。云量的变化是影响EUV辐射剂量的主要因素，尤其是在1960年代，1970年代以及新千年之初。 2004-2013十年间，EUV的年均辐射剂量下降了5％。影响EUV辐射剂量的因素也因所选的积分期（每日，每月和每年）而有所不同：太阳天顶角对于日剂量，云量和表面紫外线反射率（按月均数）和年度剂量最重要总臭氧柱对EUV辐射剂量的影响最大。 EUV辐射剂量很高的天数每十年增加22％，在除秋季外的所有季节中，统计上的显着增加。 EUV剂量很高的日子的发生主要受臭氧总量低（占天数的82％），晴空或部分多云的条件（占天数的74％）和表面反照率增加（占天数的19％）的影响。天）。主成分分析表明，EUV辐射剂量很高的日子受北大西洋涛动正相的影响很大，亚速尔群岛高海角一直延伸到中欧。在平流层中，强烈的北极绕极涡旋和子午空气从西南方向的臭氧稀少流入有利于发生极高EUV辐射剂量的日子。这是对高EUV辐射剂量与宏观尺度环流模式之间关系的首次分析，因此，还应更多关注可能影响地球表面太阳紫外线辐射的其他动力学变量。

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