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Influence of the Arctic Sea-Ice Regime Shift on Sea-Ice Methylated Mercury Trends
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2020-08-06 , DOI: 10.1021/acs.estlett.0c00465 Amina T. Schartup 1 , Anne L. Soerensen 2 , Lars-Eric Heimbürger-Boavida 3
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2020-08-06 , DOI: 10.1021/acs.estlett.0c00465 Amina T. Schartup 1 , Anne L. Soerensen 2 , Lars-Eric Heimbürger-Boavida 3
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Arctic sea ice regulates the air–sea exchange of volatile mercury (Hg) species like dimethylmercury (DMHg) or elemental Hg and is known to host Hg methylating microbes that produce neurotoxic and biomagnifying monomethylmercury (MMHg). Arctic sea ice accounts for 57% of the total primary production in the Arctic Ocean, suggesting that it could be the main source of MMHg to arctic food webs. Despite this, little is known about Hg concentrations and speciation in arctic sea ice. Here, we report Hg species and show the importance of sea-ice composition on sea-ice methylmercury (MeHg = DMHg + MMHg) budgets. We propose that the shift from older sea ice (lower MeHg) to younger sea ice (higher MeHg) resulted in a 40% increase in MeHg (per square meter of sea ice) since 1979 despite a 45% decline in the total sea-ice volume. Approximately 30% of the MeHg sea-ice budget is DMHg, which means that when the sea ice melts in the summer it could contribute 0.03–2.7 pmol of DMHg m–2 day–1 to the atmosphere, which is comparable to diffusion from water (0.48–2.8 pmol of DMHg m–2 day–1). This study shows that the MeHg content of rapidly shrinking arctic sea ice and exposure of sea-ice biota may not be declining as previously thought.
中文翻译：
北极海冰制度转变对海冰甲基化汞趋势的影响
北极海冰调节着诸如二甲基汞（DMHg）或元素汞之类的挥发性汞（Hg）物种在海-海之间的交换，并且已知含有产生神经毒性和生物放大性单甲基汞（MMHg）的甲基化微生物。北极海冰占北冰洋初级生产总量的57％，这表明它可能是北极食物网中MMHg的主要来源。尽管如此，对北极海冰中的汞浓度和形态知之甚少。在这里，我们报告了汞的种类，并显示了海冰成分对海冰甲基汞（MeHg = DMHg + MMHg）预算的重要性。我们建议，自1979年以来，尽管总海冰下降了45％，但从较老的海冰（较低的MeHg）向较年轻的海冰（较高的MeHg）的转变导致了MeHg（每平方米海冰）增加了40％。卷。–2天–1到大气中，相当于从水中扩散（0.48–2.8 pmol DMHg m –2天–1）。这项研究表明，迅速收缩的北极海冰的MeHg含量和海冰生物区系的暴露可能没有像以前所认为的那样下降。
更新日期：2020-10-13
中文翻译：
北极海冰制度转变对海冰甲基化汞趋势的影响
北极海冰调节着诸如二甲基汞（DMHg）或元素汞之类的挥发性汞（Hg）物种在海-海之间的交换，并且已知含有产生神经毒性和生物放大性单甲基汞（MMHg）的甲基化微生物。北极海冰占北冰洋初级生产总量的57％，这表明它可能是北极食物网中MMHg的主要来源。尽管如此，对北极海冰中的汞浓度和形态知之甚少。在这里，我们报告了汞的种类，并显示了海冰成分对海冰甲基汞（MeHg = DMHg + MMHg）预算的重要性。我们建议，自1979年以来，尽管总海冰下降了45％，但从较老的海冰（较低的MeHg）向较年轻的海冰（较高的MeHg）的转变导致了MeHg（每平方米海冰）增加了40％。卷。–2天–1到大气中，相当于从水中扩散（0.48–2.8 pmol DMHg m –2天–1）。这项研究表明，迅速收缩的北极海冰的MeHg含量和海冰生物区系的暴露可能没有像以前所认为的那样下降。
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