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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：SCIAMACHY甲醛观察结果：欧洲对异戊二烯排放量估算的限制？

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Formaldehyde (HCHO) is an important intermediate compound in the degradationof volatile organic compounds (VOCs) in the troposphere. Sources of HCHO arelargely dominated by its secondary production from VOC oxidation, methaneand isoprene being the main precursors in unpolluted areas. As a result ofthe moderate lifetime of HCHO, its spatial distribution is determined byreactive hydrocarbon emissions. We focus here on Europeand investigate the influence of the different emissions on HCHOtropospheric columns with the CHIMERE chemical transport model in order tointerpret the comparisons between SCIAMACHY and simulated HCHO columns. Europewas never specifically studied before for these purposes using satellite observations.The bias between measurements and model is less than 20% on average. The differencesare discussed according to the errors on the model and the observations andremaining discrepancies are attributed to a misrepresentation ofbiogenic emissions. This study requires the characterisation of: (1) themodel errors and performances concerning formaldehyde. The errors on theHCHO columns, mainly related to chemistry and mixed emission types, areevaluated to 2×1015 molecule/cm2 and the model performancesevaluated using surface measurements are satisfactory (~13%); (2)the observation errors that define the needs in spatial and temporalaveraging for meaningful comparisons. Using SCIAMACHYobservations as constraint for biogenic isoprene emissions in an inversemodelling scheme reduces their uncertainties by about a factor of twoin region of intense emissions. The retrieved correction factors for the isopreneemissions 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主导，甲烷和异戊二烯是无污染地区的主要前体。由于HCHO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Europeand上，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。为此，欧洲从未针对卫星观测进行过专门研究，测量值和模型之间的偏差平均小于20％。根据模型上的误差讨论了差异，并且观测值和剩余差异归因于生物排放的误解。这项研究需要表征：（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排放类型有关，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）观测误差定义了进行有意义的比较时空平均所需的条件。在反向建模方案中，使用SCIAMACHY观测值作为生物异戊二烯排放的约束条件，可以在高排放区域将不确定性降低大约两倍。根据地区的不同，检索到的等距校正因子从0.15（北非）到2（波兰，英国）不等。

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