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| DOI | 10.5194/acp-20-7231-2020 |
| Effects of a priori profile shape assumptions on comparisons between satellite NO2 columns and model simulations | |
| Martin R.V.; Martin R.V.; Henze D.K.; Jones D.B.A. | |
| 发表日期 | 2020 |
| ISSN | 16807316 |
| 起始页码 | 7231 |
| 结束页码 | 7241 |
| 卷号 | 20期号:12 |
| 英文摘要 | A critical step in satellite retrievals of trace gas columns is the calculation of the air mass factor (AMF) used to convert observed slant columns to vertical columns. This calculation requires a priori information on the shape of the vertical profile. As a result, comparisons between satelliteretrieved and model-simulated column abundances are influenced by the a priori profile shape. We examine how differences between the shape of the simulated and a priori profiles can impact the interpretation of satellite retrievals by performing an adjoint-based four-dimensional variational (4D-Var) assimilation of synthetic NO2 observations for constraining NOx emissions. We use the GEOS-Chem adjoint model to perform assimilations using a variety of AMFs to examine how a posteriori emission estimates are affected if the AMF is calculated using an a priori shape factor that is inconsistent with the simulated profile. In these tests, an inconsistent a priori shape factor increased root mean square errors in a posteriori emission estimates by up to 30% for realistic conditions over polluted regions. As the difference between the simulated profile shape and the a priori profile shape increases, so do the corresponding assimilated emission errors. This reveals the importance of using simulated profile information for AMF calculations when comparing that simulated output to satellite-retrieved columns. © 2020 Author(s). |
| 关键词 | air masscomparative studycomputer simulationdata assimilationnitrogen dioxidenumerical modelsatellite imagerytrace gas |
| 语种 | 英语 |
| 来源机构 | Atmospheric Chemistry and Physics |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/131963 |
| 推荐引用方式 GB/T 7714 | Martin R.V.,Martin R.V.,Henze D.K.,et al. Effects of a priori profile shape assumptions on comparisons between satellite NO2 columns and model simulations[J]. Atmospheric Chemistry and Physics,2020,20(12). |
| APA | Martin R.V.,Martin R.V.,Henze D.K.,&Jones D.B.A..(2020).Effects of a priori profile shape assumptions on comparisons between satellite NO2 columns and model simulations.,20(12). |
| MLA | Martin R.V.,et al."Effects of a priori profile shape assumptions on comparisons between satellite NO2 columns and model simulations".20.12(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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