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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >Overestimation of Downward Air-Sea Eddy CO2 Flux Due to Optical Window Contamination of Open-Path Gas Analyzer
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Overestimation of Downward Air-Sea Eddy CO2 Flux Due to Optical Window Contamination of Open-Path Gas Analyzer

机译：高估开放式气体分析仪的光学窗口污染导致的向下海气涡流CO2通量

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References(20) Supplementary materials(1) Open-path eddy-covariance CO2 flux over the ocean have been reported to be much larger in magnitude than the estimated bulk CO2 flux, and optical window contamination of the open-path gas analyzers has been reported as the cause of the overestimations. During an on-board experiment over the ocean, we manually cleaned the optical window and directly compared CO2 output signal before and after the window cleaning. It is found that both of the CO2 fluctuation amplitude and correlation coefficient between vertical wind velocity and CO2 mixing ratio have apparently increased, then resulting in the downward CO2 flux overestimation when the optical window contamination accumulate. These apparent increases were reset after the manual window cleaning. Correlation coefficients between CO2 and H2O output signals, which represent cross-sensitivity between CO2 and H2O, can be useful indicators of optical window contamination of the open-path gas analyzer.
机译：参考文献（20）补充材料（1）据报道，海洋上的开路涡流-协方差CO2通量的大小比估计的散装CO2通量大得多，并且据报道开路气体分析仪的光学窗污染作为高估的原因。在海洋上的一次船上实验中，我们手动清洁了光学窗户，并在窗户清洁前后直接比较了CO2输出信号。研究发现，CO2波动幅度和垂直风速与CO2混合比之间的相关系数均明显增加，从而导致当光学窗污染累积时，CO2通量向下估算过高。这些明显的增加在手动清洁窗户后被重置。 CO2和H2O输出信号之间的相关系数代表CO2和H2O之间的交叉敏感度，可以用作开放式气体分析仪光学窗口污染的有用指标。

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