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首页> 外文期刊>Atmospheric chemistry and physics >How consistent are top-down hydrocarbon emissions based on formaldehyde observations from GOME-2 and OMI?
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How consistent are top-down hydrocarbon emissions based on formaldehyde observations from GOME-2 and OMI?

机译：根据来自GOME-2和OMI的甲醛观测值，自上而下的碳氢化合物排放量有多一致？

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摘要

The vertical columns of formaldehyde (HCHO) retrieved from two satellite instruments, the Global Ozone Monitoring Instrument-2 (GOME-2) on Metop-A and the Ozone Monitoring Instrument (OMI) on Aura, are used to constrain global emissions of HCHO precursors from open fires, vegetation and human activities in the year 2010. To this end, the emissions are varied and optimized using the adjoint model technique in the IMAGESv2 global CTM (chemical transport model) on a monthly basis and at the model resolution. Given the different local overpass times of GOME-2 (09: 30 LT) and OMI (13: 30 LT), the simulated diurnal cycle of HCHO columns is investigated and evaluated against ground-based optical measurements at seven sites in Europe, China and Africa. The modeled diurnal cycle exhibits large variability, reflecting competition between photochemistry and emission variations, with noon or early afternoon maxima at remote locations (oceans) and in regions dominated by anthropogenic emissions, late afternoon or evening maxima over fire scenes, and midday minima in isoprene-rich regions. The agreement between simulated and ground-based columns is generally better in summer (with a clear afternoon maximum at mid-latitude sites) than in winter, and the annually averaged ratio of afternoon to morning columns is slightly higher in the model (1.126) than in the ground-based measurements (1.043).
机译：从两个卫星仪器（Metop-A上的全球臭氧监测仪器2（GOME-2）和Aura上的臭氧监测仪器（OMI））中获取的甲醛（HCHO）垂直列用于限制HCHO前体的全球排放从2010年的明火，植被和人类活动开始。为此，使用IMAGESv2全球CTM（化学运输模型）中的伴随模型技术，每月并以模型分辨率对排放进行变化和优化。考虑到GOME-2（09：30 LT）和OMI（13：30 LT）的本地过桥时间不同，我们在欧洲，中国和欧洲的七个地点对HCHO色谱柱的模拟日循环进行了调查和评估，并与地面光学测量进行了对比。非洲。模拟的昼夜周期表现出较大的变异性，反映了光化学与排放变化之间的竞争，在偏远地区（海洋）和以人为排放为主的地区，午后或午后最大值，火灾现场午后或傍晚最大值，异戊二烯中午最小值丰富的地区。夏季（中纬度地区午后明显晴朗），模拟柱与地面柱之间的一致性通常好于冬季，模型中下午柱与早晨柱的年平均比率（1.126）略高于冬季。在地面测量中（1.043）。

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