Sulfur isotopic composition of surface snow along a latitudinal transect in East Antarctica
Sulfur isotopic composition of surface snow along a latitudinal transect in East Antarctica
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DOI：
10.1002/2016gl069482
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发表时间：
2016-06
影响因子：
5.2
通讯作者：
R. Uemura;Kosuke Masaka;K. Fukui;Y. Iizuka;M. Hirabayashi;H. Motoyama
中科院分区：
文献类型：
--
作者：
R. Uemura;Kosuke Masaka;K. Fukui;Y. Iizuka;M. Hirabayashi;H. Motoyama
硫酸盐气溶胶的硫稳定同位素值（δ 34 S）可用于评估氧化途径和各种来源的贡献，如海洋生物硫，火山和海盐。然而，由于缺乏观测，南极硫酸盐气溶胶中δ 34 S值的空间分布仍不清楚。在这里，我们提出的第一个硫同位素值从表面雪样品沿着纬度样带在东南极洲德龙宁毛德地。硫酸盐的δ 34 S值在14.8-16.9‰之间，分布较均匀，向内陆方向没有明显降低。这些结果表明，净同位素分馏在远程传输是微不足道的。因此，δ 34 S值可用于推断源贡献。δ 34 S值表明，海洋生物硫是硫酸盐气溶胶的主要来源，贡献率为84 ± 16%。
The sulfur stable isotopic values (δ34S) of sulfate aerosols can be used to assess oxidation pathways and contributions from various sources, such as marine biogenic sulfur, volcanoes, and sea salt. However, because of a lack of observations, the spatial distribution of δ34S values in Antarctic sulfate aerosols remains unclear. Here we present the first sulfur isotopic values from surface snow samples along a latitudinal transect in eastern Dronning Maud Land, East Antarctica. The δ34S values of sulfate showed remarkably uniform values, in the range of 14.8–16.9‰, and no significant decrease toward the inland part of the transect was noted. These results suggest that net isotopic fractionation during long‐range transport is insignificant. Thus, the δ34S values can be used to infer source contributions. The δ34S values suggest that marine biogenic sulfur is the dominant source of sulfate aerosols, with a fractional contribution of 84 ± 16%.