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首页> 外文期刊>Atmosphere >Analysis of the Error in Retrievals of Aerosol Optical Properties from Sunphotometer Measurements of CARSNET Due to a Variety of Objective Factors
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Analysis of the Error in Retrievals of Aerosol Optical Properties from Sunphotometer Measurements of CARSNET Due to a Variety of Objective Factors

机译：各种客观因素引起的CARSNET的光度计测量对气溶胶光学性质的检索误差分析

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In situ observation of the aerosol optical properties is important to the validations of satellite and modeling results; however, the operational measurements can be affected by some objective factors. An experiment study has been performed in order to analyze the error in retrievals of aerosol optical properties from sunphotometer measurements caused by a variety of in situ objective factors. The standard instrument relative error analysis method was used to determine the relative error of aerosol optical depth (AOD) and ?ngstr?m exponent (AE) under the effects of five factors: spider web inside the collimator (F1); collimator bending (F2); dust inside the optical head (F3); incrustation scale inside the optical head (F4); and dust and incrustation scale inside the optical head (F5). The results showed that the five factors caused error for AOD retrieved at 1020, 870, 670 and 440 nm, with the maximum error occurring at 870 nm due to the more sensitive measurement signals. The error ranges of AOD derived from the direct solar measurements in the four bands were ?0.34%–8.77%, ?6.22%–9.68%, ?0.05%–2.52%, ?0.96%–3.48% and 5.42%–13.38% for F1, F2, F3, F4 and F5, respectively. The maximum error occurred under the influence of F5 with an average error value of 10%, while the minimum occurred owing to F3 with an average error value of 1%. All of the AEs retrieved from the experimental instruments were smaller than that from the reference instrument. The AE error values were 15.19%, 25.57%, 4.56%, 4.41% and 8.83% for F1, F2, F3, F4 and F5, respectively. The average AE retrieval error value was 11.7%.
机译：气溶胶光学特性的原位观测对于卫星和模型结果的验证很重要。但是，操作测量可能会受到某些客观因素的影响。为了分析由各种原位客观因素引起的从日光光度计测量中获得的气溶胶光学特性的误差，已经进行了一项实验研究。在五个因素的影响下，使用标准仪器相对误差分析方法确定气溶胶光学深度（AOD）和弹力指数（AE）的相对误差：准直仪内部的蜘蛛网（F1）;准直器弯曲（F2）;光学头（F3）内有灰尘;光学头内部的结垢刻度（F4）;以及光学头（F5）内的灰尘和结垢垢。结果表明，这五个因素导致在1020、870、670和440 nm处检索到的AOD产生误差，由于更敏感的测量信号，最大误差出现在870 nm处。在四个波段中，直接太阳测量得出的AOD误差范围分别为？0.34％–8.77％、? 6.22％–9.68％、? 0.05％–2.52％、? 0.96％–3.48％和5.42％–13.38％。 F1，F2，F3，F4和F5。最大误差在F5的影响下发生，平均误差值为10％，而最小误差则在F3的影响下发生，平均误差值为1％。从实验仪器中检索到的所有AE均小于从参考仪器中获得的AE。 F1，F2，F3，F4和F5的AE误差值分别为15.19％，25.57％，4.56％，4.41％和8.83％。平均AE检索误差值为11.7％。

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