Oceanic bromoform sources for the tropical atmosphere
Oceanic bromoform sources for the tropical atmosphere
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DOI：
10.1029/2004gl020597
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发表时间：
2004-10-05
影响因子：
5.2
通讯作者：
Wallace, DWR
中科院分区：
文献类型：
--
作者：
Quack, B;Atlas, E;Wallace, DWR
海洋溴仿（CHBr3）是大气中有机溴的主要来源，通过活性溴对中纬度和热带地区对流层上部和平流层下部的贡献，可能对臭氧消耗产生重大影响。我们报告的边界层空气，表面和深海沃茨从热带大西洋的第一次分析。这些数据提供了证据，证明整个热带公海的CHBr3来源与热带温跃层内的深层叶绿素最大值相关。赤道上升流将CHBr 3带到地表，增加了赤道混合层的浓度，并推动海洋排放，支持当地大气浓度升高。在穿越非洲西北部沿海上升流区的气团中，测得的大气混合比甚至更高。这些观测结果表明，气候、风驱动的上升流和热带地区高层大气中溴的供应之间存在联系。
Oceanic bromoform (CHBr3) is the major source of organic Br to the atmosphere and may be significant for ozone depletion through the contribution of reactive bromine to the upper troposphere and lower stratosphere of the midlatitudes and tropics. We report the first analyses of boundary layer air, surface and deep ocean waters from the tropical Atlantic. The data provide evidence of a source of CHBr3 throughout the tropical open ocean associated with the deep chlorophyll maximum within the tropical thermocline. Equatorial upwelling carries the CHBr3 to the surface, adding to increased concentrations in the equatorial mixed layer and driving oceanic emissions that support locally elevated atmospheric concentrations. In air masses that had crossed the coastal upwelling region off NW Africa even higher atmospheric mixing ratios were measured. The observations suggest a link between climate, wind-driven upwelling, and the supply of Br to the upper atmosphere of the tropics.