Bromoform in tropical Atlantic air from 25°N to 25°S
Bromoform in tropical Atlantic air from 25°N to 25°S
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25°N 至 25°S 热带大西洋空气中的三溴甲烷
DOI：
10.1029/2007gl029893
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发表时间：
2007
影响因子：
5.2
通讯作者：
J. McQuaid
中科院分区：
文献类型：
--
作者：
L. Carpenter;D. Wevill;J. Hopkins;R. Dunk;C. E. Jones;K. Hornsby;J. McQuaid
在非洲西北部海岸/上升流区上空平流的气团中，在8-25°N、17-21°W之间，在大西洋东部上空测得的溴仿（CHBr 3）的大气混合比增强（4至13 pptv）。在8-10°N的最高混合比与非洲萨凡纳带的生物质燃烧羽流有关。然而，在尼日利亚上空采集的空气样本表明，这里的生物质燃烧不是三溴甲烷的来源。以前报告的水样本附近的西北非洲上升流区不支持观察到的大气中的CHBr 3非常高的水平，除非有显着的表面分层的大气边界层。其他可能的解释包括沿海大型藻类和/或非洲大陆的来源。重要的是要确定CHBr 3的热带来源的性质，以建立有机溴和气候变化之间的反馈机制。
Atmospheric mixing ratios of bromoform (CHBr3) measured over the eastern Atlantic Ocean were enhanced (4 to 13 pptv) between 8–25°N, 17–21°W, in air masses advected over the NW African coast/upwelling zone. The highest mixing ratios at 8–10°N were associated with a biomass burning plume from the African savannah belt. Airborne samples taken over Nigeria showed however that biomass burning here is not a source of CHBr3. Previously reported water samples taken near to the NW African upwelling zone do not support the very high levels of atmospheric CHBr3 observed, unless there is significant surface stratification of the atmospheric boundary layer. Other potential explanations include coastal macroalgae and/or sources within continental Africa. It is important to ascertain the nature of tropical sources of CHBr3 in order to establish the mechanisms of suggested feedbacks between organic bromine and climate change.