Industrial-era decline in Arctic methanesulfonic acid is offset by increased biogenic sulfate aerosol
Industrial-era decline in Arctic methanesulfonic acid is offset by increased biogenic sulfate aerosol
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DOI：
10.1073/pnas.2307587120
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发表时间：
2023-11
影响因子：
11.1
通讯作者：
U. Jongebloed;Andrew J Schauer;J. Cole‐Dai;C. Larrick;William C. Porter;L. Tashmim;S. Zhai;Sara Salimi;Shana R Edouard;L. Geng;B. Alexander
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文献类型：
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作者：
U. Jongebloed;Andrew J Schauer;J. Cole‐Dai;C. Larrick;William C. Porter;L. Tashmim;S. Zhai;Sara Salimi;Shana R Edouard;L. Geng;B. Alexander
格陵兰冰芯上甲烷磺酸(MSA)浓度的显著下降表明北大西洋浮游植物的数量正在下降，这对海洋生态系统和气候产生了影响。MSA被用来推断浮游植物的丰度，因为浮游植物释放出二甲基硫化物(DMS)，后者被氧化成MSA和硫酸盐。然而，大气化学控制着有多少DMS被转化为MSA而不是硫酸盐。在这里，我们测量了工业时代格陵兰冰芯中DMS衍生的硫酸盐与MSA的比较。我们发现，总生物硫，即MSA和DMS衍生硫酸盐的总和，在工业时代相对稳定，但MSA下降，因为人为污染影响了MSA与DMS衍生硫酸盐的比率。因此，将MSA解释为DMS排放的替代指标必须考虑大气化学。
Significance Decreasing methanesulfonic acid (MSA) concentrations across Greenland ice cores have suggested declining North Atlantic phytoplankton abundance, with implications for ocean ecosystems and climate. MSA is used to infer phytoplankton abundance because phytoplankton emits dimethyl sulfide (DMS), which is oxidized to MSA and sulfate. However, atmospheric chemistry controls how much DMS is converted to MSA vs. sulfate. Here, we measure DMS-derived sulfate compared to MSA in a Greenland ice core over the industrial era. We show that total biogenic sulfur, the sum of MSA and DMS-derived sulfate, is relatively steady over the industrial era, but MSA declines because anthropogenic pollution affects the ratio of MSA vs. DMS-derived sulfate. Therefore, interpreting MSA as a proxy for DMS emissions must consider atmospheric chemistry.