Iizuka Yoshinori, Matsumoto Mai, Kawakami Kaoru, Sasage Mahiro, Ishino Sakiko, Hattori Shohei, Uemura Ryu, Matsui Hitoshi, Fujita Koji, Oshima Naga, Spolaor Andrea, Svensson Anders, Vinther Bo Møllesøe, Ohno Hiroshi, Seki Osamu, Matoba Sumito
Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan.
Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan.
Nat Commun. 2025 May 19;16(1):4272. doi: 10.1038/s41467-025-59208-0.
Anthropogenic NO emissions have altered the biogeochemical nitrogen cycle since the Industrial Revolution, yet Arctic ice core nitrate (NO) records are inconsistent with post-1970s NO emission reductions. Here we show a NO deposition history covering 1800-2020 using an ice core from the southeastern Greenland dome with high snow accumulation. The ice core NO concentrations are particularly disconnected from NO source regions during the peak pollution period and post-1990s. A global chemical transport model reproduced these discordances between total NO and NO emissions by altering gaseous HNO and particulate NO (p-NO) ratios and subsequently NO lifetime. This result and correlations with acidity parameters recorded in the ice core, suggest that acidity-driven gas-particle partitioning of NO regulates its transport to Arctic regions alongside changes in NO emissions. In the future, despite NO reductions, the increase in proportion of p-NO with longer atmospheric lifetime becomes crucial to control the Arctic NO burden.
自工业革命以来，人为源一氧化氮（NO）排放改变了生物地球化学氮循环，但北极冰芯硝酸盐（NO₃⁻）记录与20世纪70年代后NO排放减少的情况不一致。在此，我们利用格陵兰东南部高积雪量冰穹的冰芯展示了1800年至2020年的NO₃⁻沉积历史。在污染高峰期和20世纪90年代后，冰芯中的NO₃⁻浓度与NO源区尤其脱节。一个全球化学传输模型通过改变气态HNO₃和颗粒态NO₃⁻（p-NO₃⁻）的比例以及随后的NO₃⁻寿命，再现了总NO₃⁻与NO排放之间的这些不一致。这一结果以及与冰芯中记录的酸度参数的相关性表明，酸度驱动的NO₃⁻气粒分配在NO排放变化的同时调节了其向北极地区的传输。未来，尽管NO排放减少，但具有更长大气寿命的p-NO₃⁻比例增加对于控制北极NO₃⁻负担至关重要。
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