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Spatial and temporal UV irradiance and aerosol variability within the area of an OMI satellite pixel

机译：OMI卫星像素区域内的时空紫外线辐照度和气溶胶变异性

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Results of an experimental campaign that took place in the greater Thessaloniki area were used to investigate temporal and spatial UV variability within an OMI satellite pixel. UV irradiance and aerosol optical depth measurements were performed for a one month period at three sites characterized as urban, rural and industrial, depending on their location and possible local aerosol sources. OMI showed a general UV irradiance overestimation compared to all three sites and for all atmospheric conditions. During the campaign the standard deviation calculated from the three sites for UV irradiance at 324 nm was of the order of 26%. For cloudless days with high spatial aerosol variability, UV differences reached +/- 20% within the OMI pixel. For cloudy days UV differences up to 100% were found at the three sites, a percentage that depends on the ground-based data integration time used for the comparison. Here we tried to focus on the limitations when trying to interpret results of UV irradiance comparisons between OMI satellite and ground based stations, taking into account the UV variability within an OMI pixel, due to such small scale spatial cloud and aerosol inhomogeneities.
机译：在塞萨洛尼基大面积地区进行的实验活动的结果被用于调查OMI卫星像素内的时间和空间紫外线变化。紫外线辐射和气溶胶光学深度测量在三个地点进行了为期一个月的测试，三个地点分别是城市，农村和工业，具体取决于其位置和可能的本地气溶胶来源。与所有这三个位置以及所有大气条件相比，OMI显示出一般的紫外线辐照度高估。在竞选期间，从三个位置计算出的324 nm处的UV辐照的标准偏差约为26％。对于具有高空间气溶胶变异性的无云日，OMI像素内的紫外线差异达到+/- 20％。在多云的日子里，在三个站点发现的紫外线差异高达100％，该百分比取决于用于比较的地面数据集成时间。在这里，我们试图解释OMI卫星和地面站之间的UV辐照度比较的结果时要考虑到局限性，并考虑到OMI像素内的UV变异性，这是由于这种小规模的空间云和气溶胶不均匀性造成的。

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