气候变化领域集成服务门户(CCPortal): Error induced by neglecting subgrid chemical segregation due to inefficient turbulent mixing in regional chemical-transport models in urban environments

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DOI	10.5194/acp-21-483-2021
	Error induced by neglecting subgrid chemical segregation due to inefficient turbulent mixing in regional chemical-transport models in urban environments
	Li C.W.Y.; Brasseur G.P.; Schmidt H.; Mellado J.P.
发表日期	2021
ISSN	1680-7316
起始页码	483
结束页码	503
卷号	21 期号:1
英文摘要	We employed direct numerical simulations to estimate the error on chemical calculation in simulations with regional chemical-transport models induced by neglecting subgrid chemical segregation due to inefficient turbulent mixing in an urban boundary layer with strong and heterogeneously distributed surface emissions. In simulations of initially segregated reactive species with an entrainment-emission configuration with an A-B-C second-order chemical scheme, urban surface emission fluxes of the homogeneously emitted tracer A result in a very large segregation between the tracers and hence a very large overestimation of the effective chemical reaction rate in a complete-mixing model. This large effect can be indicated by a large Damköhler number D a of the limiting reactant. With heterogeneous surface emissions of the two reactants, the resultant normalised boundary-layer-averaged effective chemical reaction rate is found to be in a Gaussian function of Da, and it is increasingly overestimated by the imposed rate with an increased horizontal scale of emission heterogeneity. Coarse-grid models with resolutions commensurable to regional models give reduced yet still significant errors for all simulations with homogeneous emissions. Such model improvement is more sensitive to the increased vertical resolution. However, such improvement cannot be seen for simulations with heterogeneous emissions when the horizontal resolution of the model cannot resolve emission heterogeneity. This work highlights particular conditions in which the ability to resolve chemical segregation is especially important when modelling urban environments. © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License.
英文关键词	chemical reaction; error analysis; turbulent boundary layer; turbulent mixing; urban area
语种	英语
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/168841
作者单位	Max Planck Institute for Meteorology, Bundesstrasse 53, Hamburg, 20146, Germany; National Center for Atmospheric Research, 1850 Table Mesa Dr, Boulder, CO 80305, United States; Department of Physics, Aerospace Engineering Division, Universitat Politècnica de Catalunya, C. Jordi Girona 1-3, Barcelona, 08034, Spain
推荐引用方式 GB/T 7714	Li C.W.Y.,Brasseur G.P.,Schmidt H.,et al. Error induced by neglecting subgrid chemical segregation due to inefficient turbulent mixing in regional chemical-transport models in urban environments[J],2021,21(1).
APA	Li C.W.Y.,Brasseur G.P.,Schmidt H.,&Mellado J.P..(2021).Error induced by neglecting subgrid chemical segregation due to inefficient turbulent mixing in regional chemical-transport models in urban environments.Atmospheric Chemistry and Physics,21(1).
MLA	Li C.W.Y.,et al."Error induced by neglecting subgrid chemical segregation due to inefficient turbulent mixing in regional chemical-transport models in urban environments".Atmospheric Chemistry and Physics 21.1(2021).