| 南极中山站太阳紫外辐射测值比较 |
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| 引用本文： | 郑向东, 程海轩. 南极中山站太阳紫外辐射测值比较. 应用气象学报, 2020, 31(4): 482-493. DOI: 10.11898/1001-7313.20200410. |
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| 作者姓名： | 郑向东 程海轩 |
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| 作者单位： | 1.中国气象科学研究院, 北京 100081;2.北京师范大学物理系, 北京 100875 |
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| 摘 要： | 比较分析了2017年南极中山站3种仪器测量地面太阳紫外B（UVB）波段和紫外A（UVA）波段的辐照度。以Brewer光谱仪测值为参考，国产宽波段FSUVB日射表在UVB（波段280~315 nm）的辐照度相对误差为（55±75）%，误差随大气臭氧总量的增加呈上升趋势，但在南极“臭氧洞”期间偏低。Yankee UVB宽波段日射表在UVB（波段280~320 nm）的辐照度相对误差为（-31±22）%；国产宽波段FSUVA日射表在UVA（波段315~400 nm）的辐照度相对误差为（23±5.9）%。太阳天顶角低于80°的晴天以Tropospheric Ultraviolet Visible（TUV）辐射模式计算结果为参考时，FSUVB，Yankee UVB和FSUVA辐照度的平均相对误差分别为（30±37）%，（-22±19）%和（27±6.4）%，而Brewer相对误差未超过3.5%。国产宽波段UV日射表测值偏高，反映出波长较长的杂散光对太阳辐照度测值影响明显。
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| 关 键 词： | FSUVA/FSUVB日射表 Brewer光谱仪 TUV模式计算 UV辐照度 南极中山站 |
| 收稿时间： | 2019-12-19 |
| 修稿时间： | 2020-03-19 |
Comparison of Solar Ultraviolet Irradiance Measurements at Zhongshan Station,Antarctica |
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| Zheng Xiangdong, Cheng Haixuan. Comparison of solar ultraviolet irradiance measurements at Zhongshan Station, Antarctica. J Appl Meteor Sci, 2020, 31(4): 482-493. DOI: 10.11898/1001-7313.20200410. |
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| Authors: | Zheng Xiangdong Cheng Haixuan |
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| Affiliation: | 1. Chinese Academy of Meteorological Sciences, Beijing 100081;2. Department of Physics, Beijing Normal University, Beijing 100875 |
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| Abstract: | A comparative analysis is presented on surface solar ultraviolet B (UVB) band and ultraviolet A (UVA) irradiance measured by 3 UV broadband pyranometers: FSUVA(315-400 nm), FSUVB(280-315 nm) provided by Jiangsu Radio Scientific Institute Co. LTD (CJRSI), American Yankee UVB(280-320 nm), and Brewer ozone spectrophotometer, placed at Zhongshan Station, Antarctica. Using data of Brewer ozone spectrophotometer in 2017 as a reference, results show that, for UVB(280-315 nm) irradiance, the error of FSUVB is averagely (55±75)% but its irradiance is lower during the "ozone hole" period, indicating that domestic made FSUVB broadband radiometer is less sensitive to the ozone layer thinning. Furthermore, the irradiance relative error of FSUVB shows a certain upward trend with the increase of total atmospheric ozone, indicating an over-measured UVB irradiance by the FSUVB pyranometer in regions with normal ozone concentration, such as the area of middle-low latitudes including China. As a contrast, the error of Yankee UVB (280-320 nm) is averagely (-31±22)% lower than that of Brewer measured, however, the relative error and total ozone variation are unrelated. The under-measured UVB irradiance from the Yankee UVB pyranometer is attributed to the system calibration error. Since Brewer spectral UV measurement is limited within 286.5-363 nm, a so-called UV correction factor, on the basis of empirical ratio of spectral irradiance at the wavelength longer than 363 nm to the Brewer measured irradiance at 363 nm, is applied to make up Brewer spectral irradiance gap of 363.5-400 nm with wavelength resolution of 0.5 nm for constructing Brewer entire spectral UVA (315-400 nm) irradiance. The error of FSUVA is averagely (23±59)% when Brewer UVA irradiance is used as the reference. With tropospheric Ultraviolet visible (TUV) radiation model calculations under cloud-free and the sun zenith angle (SZA)less than 80° as references, irradiance errors measured by FSUVB, Yankee UVB and FSUVA are (30±37)%, (-22±19)% and (27±6.4)%, respectively, in 197 cases, while the average of differences between Brewer and TUV calculations are respectively (3.4±8.5)% in UVB band of 286.5-315 nm, (2.9±6.8)% in UVB band of 286.5-320 nm and (3.4±4.5)% in UVA band of 315-400 nm, proving the method of Brewer UVA correction factor is rational. Again, only the relative error of FSUVB measurements referenced to TUV calculations displays an evident increasing trend with the growth of total ozone. Mechanisms of over-measured solar irradiances from both domestic made broad-band UV pyranometers are not fully identified. Calibration methods needed to be improved with consideration of variable SZA and total ozone. In addition, the stray light at longer wavelengths should have a significant influences on the pyranometer's performances and this stray light need to be eliminated in further instrument improvement. For FSUVB, its less sensitiveness to the solar UVB irradiance during the period of "ozone hole" still needs to be resolved. |
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| Keywords: | FSUVA FSUVB pynanometer Brewer spectrophotometer TUV mode calculation UV irradiance Zhongshan Station, Antarctica |
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