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首页> 外文期刊>Atmospheric chemistry and physics >Validation of urban NOsub2/sub concentrations and their diurnal and seasonal variations observed from the SCIAMACHY and OMI sensors using in situ surface measurements in Israeli cities
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Validation of urban NOsub2/sub concentrations and their diurnal and seasonal variations observed from the SCIAMACHY and OMI sensors using in situ surface measurements in Israeli cities

机译：使用以色列城市中的原位表面测量，验证从SCIAMACHY和OMI传感器观测到的城市NO 2 浓度及其昼夜变化和季节变化

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We compare a full-year (2006) record of surface air NO2 concentrationsmeasured in Israeli cities to coinciding retrievals of tropospheric NO2columns from satellite sensors (SCIAMACHY aboard ENVISAT and OMI aboardAura). This provides a large statistical data set for validation of NO2satellite measurements in urban air, where validation is difficult yetcrucial for using these measurements to infer NOx emissions byinverse modeling. Assuming that NO2 is well-mixed throughout the boundarylayer (BL), and using observed average seasonal boundary layer heights,near-surface NO2 concentrations are converted into BL NO2 columns. Theagreement between OMI and (13:45) BL NO2 columns (slope=0.93, n=542),and the comparable results at 10:00 h for SCIAMACHY, allow a validation ofthe seasonal, weekly, and diurnal cycles in satellite-derived NO2. OMI andBL NO2 columns show consistent seasonal cycles (winter NO21.6–2.7× higher than summer). BL and coinciding OMI columns both showa strong weekly cycle with 45–50% smaller NO2 columns on Saturdayrelative to the weekday mean, reflecting the reduced weekend activity, andvalidating the weekly cycle observed from space. The diurnal differencebetween SCIAMACHY (10:00) and OMI (13:45) NO2 is maximum in summer whenSCIAMACHY is up to 40% higher than OMI, and minimum in winter when OMIslightly exceeds SCIAMACHY. A similar seasonal variation in the diurnaldifference is found in the source region of Cairo. The surface measurementsin Israel cities confirm this seasonal variation in the diurnal cycle. Usingsimulations from a global 3-D chemical transport model (GEOS-Chem), we showthat this seasonal cycle can be explained by a much stronger photochemicalloss of NO2 in summer than in winter.
机译：我们比较了在以色列城市中测得的全年（2006年）地面空气NO 2 浓度记录与从卫星传感器（ENVISAT和OMI上的SCIAMACHY）对流层NO 2 列的重合aura）。这为验证城市空气中NO 2 卫星的测量提供了一个庞大的统计数据集，在这种情况下，通过逆向建模使用这些测量来推断NO x 的排放量是困难的，但至关重要。假设NO 2 在整个边界层（BL）中充分混合，并使用观察到的平均季节性边界层高度，将近表面NO 2 的浓度转换为BL NO < sub> 2 列。 OMI与（13:45）BL NO 2 列（坡度= 0.93， n = 542）之间的一致性以及SCIAMACHY在10:00 h的可比结果允许卫星衍生的NO 2 的季节，每周和每日周期的验证。 OMI和BL NO 2 列显示一致的季节周期（冬季NO 2 1.6–2.7倍于夏季）。 BL和一致的OMI列均显示出强劲的每周周期，与周日平均值相比，星期六的NO 2 列小45-55％，反映出周末活动减少，并验证了从太空观察到的每周周期。 SCIAMACHY（10:00）和OMI（13:45）NO 2 之间的昼夜差异在夏季最大，当SCIAMACHY比OMI高40％，而在冬季，当OMI稍微超过SCIAMACHY时最小。在开罗的源区发现昼夜差异的类似季节性变化。以色列城市的地表测量证实了这一昼夜周期的季节性变化。使用来自全球3-D化学物质传输模型（GEOS-Chem）的模拟，我们表明，这个季节周期可以用夏季NO 2 的光化学损失比冬季强得多的现象来解释。

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