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<p>Anthropogenic NO<sub>x</sub> emissions have altered the biogeochemical nitrogen cycle since the Industrial Revolution, yet Arctic ice core nitrate (NO<sub>3</sub><sup>−</sup>) records are inconsistent with post-1970s NO<sub>x</sub> emission reductions. Here we show a NO<sub>3</sub><sup>−</sup> deposition history covering 1800–2020 using an ice core from the southeastern Greenland dome with high snow accumulation. The ice core NO<sub>3</sub><sup>−</sup> concentrations are particularly disconnected from NO<sub>x</sub> source regions during the peak pollution period and post-1990s. A global chemical transport model reproduced these discordances between total NO<sub>3</sub><sup>−</sup> and NO<sub>x</sub> emissions by altering gaseous HNO<sub>3</sub> and particulate NO<sub>3</sub><sup>−</sup> (p-NO<sub>3</sub><sup>−</sup>) ratios and subsequently NO<sub>3</sub><sup>−</sup> lifetime. This result and correlations with acidity parameters recorded in the ice core, suggest that acidity-driven gas-particle partitioning of NO<sub>3</sub><sup>−</sup> regulates its transport to Arctic regions alongside changes in NO<sub>x</sub> emissions. In the future, despite NO<sub>x</sub> reductions, the increase in proportion of p-NO<sub>3</sub><sup>−</sup> with longer atmospheric lifetime becomes crucial to control the Arctic NO<sub>3</sub><sup>−</sup> burden.</p>

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Acidity-driven gas-particle partitioning of nitrate regulates its transport to Arctic through the industrial era

  • 期刊论文

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  • 发表日期：

    2025年5月19日

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  • Yoshinori Iizuka,
  • Mai Matsumoto,
  • Kaoru Kawakami,
  • Mahiro Sasage,
  • Sakiko Ishino,
  • Shohei Hattori,
  • Ryu Uemura,
  • Hitoshi Matsui,
  • Koji Fujita,
  • Naga Oshima,
  • Andrea Spolaor,
  • Anders Svensson,
  • Bo Møllesøe Vinther,
  • Hiroshi Ohno,
  • Osamu Seki,
  • Sumito Matoba

摘要

Anthropogenic NOx emissions have altered the biogeochemical nitrogen cycle since the Industrial Revolution, yet Arctic ice core nitrate (NO3−) records are inconsistent with post-1970s NOx emission reductions. Here we show a NO3− deposition history covering 1800–2020 using an ice core from the southeastern Greenland dome with high snow accumulation. The ice core NO3− concentrations are particularly disconnected from NOx source regions during the peak pollution period and post-1990s. A global chemical transport model reproduced these discordances between total NO3− and NOx emissions by altering gaseous HNO3 and particulate NO3− (p-NO3−) ratios and subsequently NO3− lifetime. This result and correlations with acidity parameters recorded in the ice core, suggest that acidity-driven gas-particle partitioning of NO3− regulates its transport to Arctic regions alongside changes in NOx emissions. In the future, despite NOx reductions, the increase in proportion of p-NO3− with longer atmospheric lifetime becomes crucial to control the Arctic NO3− burden.