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首页> 外文期刊>Atmospheric chemistry and physics >Sciamachy formaldehyde observations: Constraint for isoprene emission estimates over Europe?
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Sciamachy formaldehyde observations: Constraint for isoprene emission estimates over Europe?

机译：尚马奇甲醛的观察结果：限制欧洲异戊二烯排放量的估算吗？

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Formaldehyde (HCHO) is an important intermediate compound in the degradation of volatile organic compounds (VOCs) in the troposphere. Sources of HCHO are largely dominated by its secondary production from VOC oxidation, methane and isoprene being the main precursors in unpolluted areas. As a result of the moderate lifetime of HCHO, its spatial distribution is determined by reactive hydrocarbon emissions. We focus here on Europe and investigate the influence of the different emissions on HCHO tropospheric columns with the CHIMERE chemical transport model in order to interpret the comparisons between SCIAMACHY and simulated HCHO columns. Europe was never specifically studied before for these purposes using satellite observations. The bias between measurements and model is less than 20% on average. The differences are discussed according to the errors on the model and the observations and remaining discrepancies are attributed to a misrepresentation of biogenic emissions. This study requires the characterisation of: (1) the model errors and performances concerning formaldehyde. The errors on the HCHO columns, mainly related to chemistry and mixed emission types, are evaluated to 2 × 10~(15) molecule/cm~2 and the model performances evaluated using surface measurements are satisfactory (～13%); (2) the observation errors that define the needs in spatial and temporal averaging for meaningful comparisons. Using SCIAMACHY observations as constraint for biogenic isoprene emissions in an inverse modelling scheme reduces their uncertainties by about a factor of two in region of intense emissions. The retrieved correction factors for the isoprene emissions range from a factor of 0.15 (North Africa) to a factor of 2 (Poland, the United Kingdom) depending on the regions.
机译：甲醛（HCHO）是对流层中挥发性有机化合物（VOC）降解的重要中间化合物。 HCHO的来源主要由VOC氧化产生的二次产品所控制，甲烷和异戊二烯是无污染地区的主要前体。由于HCHO的使用寿命适中，其空间分布取决于反应性碳氢化合物的排放。我们将重点放在欧洲，并使用CHIMERE化学迁移模型研究不同排放物对HCHO对流层柱的影响，以解释SCIAMACHY与模拟HCHO柱之间的比较。出于这些目的，从未使用卫星观测对欧洲进行过专门研究。测量值与模型之间的偏差平均小于20％。根据模型上的误差讨论差异，并将观测值和剩余差异归因于生物排放的不正确陈述。这项研究要求表征：（1）有关甲醛的模型误差和性能。 HCHO色谱柱上的误差主要与化学和混合发射类型有关，评估为2×10〜（15）分子/ cm〜2，使用表面测量评估的模型性能令人满意（〜13％）; （2）观察误差定义了进行有意义的比较所需的空间和时间平均。在逆向建模方案中，使用SCIAMACHY观测值作为生物异戊二烯排放的约束条件，可以在强烈排放区域将不确定性降低大约两倍。检索到的异戊二烯排放校正系数范围从0.15（北非）到2（波兰，英国），取决于地区。

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