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DOI | 10.5194/acp-19-11089-2019 |
How marine emissions of bromoform impact the remote atmosphere | |
Jia Y.; Tegtmeier S.; Atlas E.; Quack B. | |
发表日期 | 2019 |
ISSN | 16807316 |
起始页码 | 11089 |
结束页码 | 11103 |
卷号 | 19期号:17 |
英文摘要 | It is an open question how localized elevated emissions of bromoform (CHBr3) and other very short-lived halocarbons (VSLHs), found in coastal and upwelling regions, and low background emissions, typically found over the open ocean, impact the atmospheric VSLH distribution. In this study, we use the Lagrangian dispersion model FLEXPART to simulate atmospheric CHBr3 resulting from assumed uniform background emissions, and from elevated emissions consistent with those derived during three tropical cruise campaigns. The simulations demonstrate that the atmospheric CHBr3 distributions in the uniform background emissions scenario are highly variable with high mixing ratios appearing in regions of convergence or low wind speed. This relation holds on regional and global scales. The impact of localized elevated emissions on the atmospheric CHBr3 distribution varies significantly from campaign to campaign. The estimated impact depends on the strength of the emissions and the meteorological conditions. In the open waters of the western Pacific and Indian oceans, localized elevated emissions only slightly increase the background concentrations of atmospheric CHBr3, even when 1 wide source regions along the cruise tracks are assumed. Near the coast, elevated emissions, including hot spots up to 100 times larger than the uniform background emissions, can be strong enough to be distinguished from the atmospheric background. However, it is not necessarily the highest hot spot emission that produces the largest enhancement, since the tug-of-war between fast advective transport and local accumulation at the time of emission is also important. Our results demonstrate that transport variations in the atmosphere itself are sufficient to produce highly variable VSLH distributions, and elevated VSLHs in the atmosphere do not always reflect a strong localized source. Localized elevated emissions can be obliterated by the highly variable atmospheric background, even if they are orders of magnitude larger than the average open ocean emissions. © Author(s) 2019. |
语种 | 英语 |
scopus关键词 | Vindula arsinoe |
来源期刊 | Atmospheric Chemistry and Physics
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文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/144178 |
作者单位 | GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; University of Miami, 4600 Rickenbacker Causeway, Miami, United States |
推荐引用方式 GB/T 7714 | Jia Y.,Tegtmeier S.,Atlas E.,et al. How marine emissions of bromoform impact the remote atmosphere[J],2019,19(17). |
APA | Jia Y.,Tegtmeier S.,Atlas E.,&Quack B..(2019).How marine emissions of bromoform impact the remote atmosphere.Atmospheric Chemistry and Physics,19(17). |
MLA | Jia Y.,et al."How marine emissions of bromoform impact the remote atmosphere".Atmospheric Chemistry and Physics 19.17(2019). |
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