Natural and anthropogenic sources of bromoform and dibromomethane in the oceanographic and biogeochemical regime of the subtropical North East Atlantic.
Natural and anthropogenic sources of bromoform and dibromomethane in the oceanographic and biogeochemical regime of the subtropical North East Atlantic.
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DOI：
10.1039/c9em00599d
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发表时间：
2020-03
期刊：
影响因子：
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通讯作者：
Melina Mehlmann;B. Quack;E. Atlas;H. Hepach;S. Tegtmeier
中科院分区：
文献类型：
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作者：
Melina Mehlmann;B. Quack;E. Atlas;H. Hepach;S. Tegtmeier
有机溴化合物溴仿(CHBr3)和二溴甲烷(CH2Br2)影响对流层化学和平流层臭氧消耗。它们的大气丰度通常与一个共同的海洋来源有关，这一点还没有得到很好的描述。在佛得角、加那利群岛和马德拉三个马卡洛群岛之间进行的一次巡航显示，人为来源大大增加了一些岛屿附近海洋中的CHBr3排放，特别是在加那利群岛，而海洋中的异养过程增加了从海洋到佛得角区域大气中CH2Br2的通量。随着在沿海地区释放CHBr3的人为消毒过程的增加，以及在变暖、脱氧的海洋中增加异养作用可能产生更多CH2Br2，这两种来源未来都可能提供更高比例的平流层溴，对平流层臭氧的影响尚不清楚。
The organic bromine compounds bromoform (CHBr3) and dibromomethane (CH2Br2) influence tropospheric chemistry and stratospheric ozone depletion. Their atmospheric abundance is generally related to a common marine source, which is not well characterized. A cruise between the three Macaroenesian Archipelagos of Cape Verde, the Canaries and Madeira revealed that anthropogenic sources increased oceanic CHBr3 emissions significantly close to some islands, especially at the Canaries, while heterotrophic processes in the ocean increased the flux of CH2Br2 from the sea to the atmosphere in the Cape Verde region. As anthropogenic disinfection processes, which release CHBr3 in coastal areas increase, and as more CH2Br2 may be produced from increased heterotrophy in a warming, deoxygenated ocean, both sources could supply higher fractions of stratospheric bromine in the future, with yet unknown consequences for stratospheric ozone.