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Natural halogens buffer tropospheric ozone in a changing climate
Nature Climate Change ( IF 30.7 ) Pub Date : 2020-01-20 , DOI: 10.1038/s41558-019-0675-6
Fernando Iglesias-Suarez , Alba Badia , Rafael P. Fernandez , Carlos A. Cuevas , Douglas E. Kinnison , Simone Tilmes , Jean-François Lamarque , Mathew C. Long , Ryan Hossaini , Alfonso Saiz-Lopez

Reactive atmospheric halogens destroy tropospheric ozone (O3), an air pollutant and greenhouse gas. The primary source of natural halogens is emissions from marine phytoplankton and algae, as well as abiotic sources from ocean and tropospheric chemistry, but how their fluxes will change under climate warming, and the resulting impacts on O3, are not well known. Here, we use an Earth system model to estimate that natural halogens deplete approximately 13% of tropospheric O3 in the present-day climate. Despite increased levels of natural halogens through the twenty-first century, this fraction remains stable due to compensation from hemispheric, regional and vertical heterogeneity in tropospheric O3 loss. Notably, this halogen-driven O3 buffering is projected to be greatest over polluted and populated regions, due mainly to iodine chemistry, with important implications for air quality.



中文翻译:

天然卤素在不断变化的气候中缓冲对流层臭氧

反应性大气卤素会破坏对流层臭氧 (O 3 )、空气污染物和温室气体。天然卤素的主要来源是海洋浮游植物和藻类的排放,以及来自海洋和对流层化学的非生物来源,但它们的通量在气候变暖下将如何变化,以及由此产生的对 O 3的影响尚不清楚。在这里,我们使用地球系统模型来估计天然卤素在当前气候中消耗了大约 13% 的对流层 O 3 。尽管在 21 世纪天然卤素含量有所增加,但由于对流层 O 3损失的半球、区域和垂直异质性的补偿,该部分保持稳定。值得注意的是,这种卤素驱动的 O3缓冲预计在污染和人口稠密的地区最大,主要是由于碘化学,对空气质量具有重要影响。

更新日期:2020-01-20
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