Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-6601-2018 |
LES study of the impact of moist thermals on the oxidative capacity of the atmosphere in southern West Africa | |
Brosse, Fabien1; Leriche, Maud1; Mari, Celine1; Couvreux, Fleur2,3 | |
2018-05-09 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:9页码:6601-6624 |
文章类型 | Article |
语种 | 英语 |
国家 | France |
英文摘要 | The hydroxyl radical (OH) is a highly reactive species and plays a key role in the oxidative capacity of the atmosphere. We explore the potential impact of a convective boundary layer on reconciling the calculation-measurement differences for OH reactivity (the inverse of OH lifetime) attributable to the segregation of OH and its reactants by thermals and the resulting modification of averaged reaction rates. The large-eddy simulation version of the Meso-NH model is used, coupled on-line with a detailed chemistry mechanism to simulate two contrasted biogenic and urban chemical regimes. In both environments, the top of the boundary layer is the region with the highest calculated segregation intensities but with the opposite sign. In the biogenic environment, the inhomogeneous mixing of isoprene and OH leads to a maximum decrease of 30% of the mean reaction rate in this zone. In the anthropogenic case, the effective rate constant for OH reacting with aldehydes is 16% higher than the averaged value. OH reactivity is always higher by 15 to 40% inside thermals in comparison to their surroundings as a function of the chemical environment and time of the day. Since thermals occupy a small fraction of the simulated domain, the impact of turbulent motions on domain-averaged total OH reactivity reaches a maximum decrease of 9% for the biogenic case and a maximum increase of 5% for the anthropogenic case. Accounting for the segregation of air masses by turbulent motions in regional and global models may increase OH reactivity in urban environments but lower OH reactivity in biogenic environments. In both cases, segregation alone is insufficient for resolving the underestimation between observed and modeled OH reactivity. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000431763600001 |
WOS关键词 | TROPICAL RAIN-FOREST ; TOTAL OH REACTIVITY ; VOLATILE ORGANIC-COMPOUNDS ; CONVECTIVE BOUNDARY-LAYER ; MONSOON MULTIDISCIPLINARY ANALYSIS ; LARGE-EDDY SIMULATIONS ; FIELD CAMPAIGN ; BOREAL FOREST ; MEGAN MODEL ; BOX MODEL |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/15123 |
专题 | 地球科学 |
作者单位 | 1.Univ Toulouse, CNRS, UPS, Lab Aerol, Toulouse, France; 2.Meteo France, CNRM, Toulouse, France; 3.CNRS, Toulouse, France |
推荐引用方式 GB/T 7714 | Brosse, Fabien,Leriche, Maud,Mari, Celine,et al. LES study of the impact of moist thermals on the oxidative capacity of the atmosphere in southern West Africa[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(9):6601-6624. |
APA | Brosse, Fabien,Leriche, Maud,Mari, Celine,&Couvreux, Fleur.(2018).LES study of the impact of moist thermals on the oxidative capacity of the atmosphere in southern West Africa.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(9),6601-6624. |
MLA | Brosse, Fabien,et al."LES study of the impact of moist thermals on the oxidative capacity of the atmosphere in southern West Africa".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.9(2018):6601-6624. |
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