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Season-dependent uncertainties in Baseline Surface Radiation Network (BSRN) solar radiation data
Atmospheric Research ( IF 5.5 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.atmosres.2020.105240
Jinhuan Qiu , Xuemei Zong , Jingmei Yang , Xiangao Xia

Abstract A novel radiation calibration method (Qiu et al., 2014) is improved using two new calibration selection criteria for quality control and is then used to analyze the uncertainties in global, direct and scattering solar irradiance (GSI, DSI and SSI, respectively) measurements at Izana, a Baseline Surface Radiation Network (BSRN) site. A total of 476 days of accepted calibration results from 2011 to 2014 are employed. The results reveal season-dependent uncertainties in the GSI, DSI and SSI measurements. The GSI, DSI and SSI measurements are probably lower by 3% ~ 6% in the summer and higher by 1% ~ 4% in the winter. The temperature dependency of solar radiometers is the most likely cause for this result. The calibration results are validated through two types of comparisons. The first is a comparison between aerosol optical thickness (AOT) retrievals from the vertical and horizontal DSI and AOT retrievals from the Aerosol Robotic Network (AERONET). The second is a comparison between in situ radiation measurements and model simulations. Higher GSI and DSI measurements in the summer result in systematically larger AOT retrievals, and they are also responsible for evidently lower measurements relative to model simulations. The winter case shows evidence to the contrary. Differences between in situ radiation measurements and model simulations also indicate the seasonal dependence of the measurement uncertainties. These results are highly significant for understanding the uncertainties in historical solar radiation data.

中文翻译:

基线表面辐射网络 (BSRN) 太阳辐射数据中的季节相关不确定性

摘要 使用两个新的质量控制校准选择标准改进了一种新的辐射校准方法 (Qiu et al., 2014),然后用于分析全局、直接和散射太阳辐照度(分别为 GSI、DSI 和 SSI)的不确定性在基线表面辐射网络 (BSRN) 站点 Izana 进行的测量。使用了 2011 年至 2014 年共 476 天的公认校准结果。结果揭示了 GSI、DSI 和 SSI 测量中与季节相关的不确定性。GSI、DSI 和 SSI 测量值可能在夏季降低 3% ~ 6%,在冬季升高 1% ~ 4%。太阳辐射计的温度依赖性是造成这一结果的最可能原因。校准结果通过两种类型的比较进行验证。第一个是来自垂直和水平 DSI 的气溶胶光学厚度 (AOT) 反演与来自气溶胶机器人网络 (AERONET) 的 AOT 反演的比较。第二个是原位辐射测量和模型模拟之间的比较。夏季较高的 GSI 和 DSI 测量值会导致系统性较大的 AOT 检索,并且它们还导致相对于模型模拟的测量值明显较低。冬季案例显示了相反的证据。原位辐射测量和模型模拟之间的差异也表明了测量不确定性的季节性依赖性。这些结果对于理解历史太阳辐射数据的不确定性非常重要。
更新日期:2021-01-01
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