Volatile biogenic halocarbons in the northwest Atlantic
Volatile biogenic halocarbons in the northwest Atlantic
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西北大西洋的挥发性生物卤化碳
DOI：
10.1029/92gb02653
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发表时间：
1993
影响因子：
5.2
通讯作者：
Ryszard Tokarczyk
中科院分区：
文献类型：
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作者：
R. Moore;Ryszard Tokarczyk
在西北大西洋的水柱中测量了一套自然产生的挥发性卤代甲烷，它们是大气中气体卤素的潜在来源。近岸水域的溴仿、氯二溴甲烷、二氯溴甲烷、二溴甲烷和甲基碘的浓度均高于远洋水域。这样的分布与大型藻类中这些化合物的已知来源是一致的。仅氯碘甲烷在表层开放海洋水域的浓度就升高，其分布被解释为表明浮游植物直接或通过二碘甲烷等中间体进行生产。后一种解释得到了巡航后对二碘甲烷分布的估计支持。虽然本研究中测量的大多数化合物在上层水柱中的浓度较高，但二溴氯甲烷和溴二氯甲烷都随着深度的增加而增加，这与表面衍生的溴仿与氯的缓慢反应一致。
A suite of naturally produced volatile halomethanes which are potential sources of gaseous halogens to the atmosphere have been measured in the water column of the NW Atlantic Ocean. Bromoform, chlorodibromomethane, dichlorobromomethane, dibromomethane, and methyl iodide all showed higher concentrations in coastal waters than in the pelagic zone. Such a distribution is consistent with known sources of these compounds in macro-algae. Chloroiodomethane alone showed elevated concentrations in surface open ocean waters, and its distribution is interpreted as indicating production by phytoplankton, either directly or through an intermediate such as di-iodomethane. The latter explanation is supported by post-cruise estimates of the di-iodomethane distribution. Whereas most of the compounds measured in this study have higher concentrations in the upper water column, both dibromochloromethane and bromodichloromethane showed increases with depth which would be consistent with a slow reaction of surface-derived bromoform with chloride.