Increased oceanic dimethyl sulfide emissions in areas of sea ice retreat inferred from a Greenland ice core
Increased oceanic dimethyl sulfide emissions in areas of sea ice retreat inferred from a Greenland ice core
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DOI：
10.1038/s43247-022-00661-w
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发表时间：
2022-12
影响因子：
7.9
通讯作者：
Y. Kurosaki;S. Matoba;Y. Iizuka;K. Fujita;R. Shimada
中科院分区：
文献类型：
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作者：
Y. Kurosaki;S. Matoba;Y. Iizuka;K. Fujita;R. Shimada
海洋浮游植物是影响海洋云形成的二甲基硫的重要来源。模型研究表明，北极海冰的减少可能导致二甲基硫醚排放量增加，但缺乏观测支持。在这里，我们提出了一个55年的高分辨率冰芯记录的甲烷磺酸通量，二甲基硫的氧化产物，从东南格陵兰冰盖。我们推断海洋二甲基硫排放的时间变化，并发现春季（4月至6月）甲烷磺酸通量与卫星来源的叶绿素a浓度在Irminger海。2002-2014年夏季（7月至9月）甲烷磺酸通量比1972-2001年高3至6倍。我们把这归因于海冰消退日变早和邻近开放沿海沃茨叶绿素a浓度的同步增加。
Ocean phytoplankton are an important source of dimethyl sulfide, which influences marine cloud formation. Model studies suggest that declines in Arctic sea ice may lead to increased dimethyl sulfide emissions, however observational support is lacking. Here, we present a 55-year high-resolution ice core record of methane sulfonic acid flux, an oxidation product of dimethyl sulfide, from the southeast Greenland Ice Sheet. We infer temporal variations in ocean dimethyl sulfide emissions and find that springtime (April–June) fluxes of methane sulfonic acid correlate well with satellite-derived chlorophyll-a concentration in the Irminger Sea. Summertime (July–September) methane sulfonic acid fluxes were 3 to 6 times higher between 2002–2014 than 1972–2001. We attribute this to sea ice retreat day becoming earlier and a coincident increase in chlorophyll-a concentration in the adjacent open coastal waters.