极地研究

极地研究 ›› 2019, Vol. 31 ›› Issue (2): 117-127.DOI: 10.13679/j.jdyj.20180047

• 研究综述 •    下一篇

南极雪冰中硝酸根稳定同位素研究进展

史贵涛1,2  秦瑞1  马红梅2  胡正毅2  安春雷2  姜苏2   李院生2   

  1. 1. 华东师范大学地理科学学院, 地理信息科学教育部重点实验室, 上海 200241;
    2. 中国极地研究中心, 上海 200136
  • 收稿日期:2018-08-24 修回日期:2018-10-13 出版日期:2019-06-30 发布日期:2019-06-30
  • 通讯作者: 史贵涛
  • 基金资助:

    国家自然科学基金项目(41576190, 41476169, 41876225)、国家重点研发计划项目(2016YFA0302204)和中央高校基本科研业务费专项资金资助

A review of the stable isotopic composition of nitrate in Antarctic snow and ice

Shi Guitao1,2, Qin Rui1, Ma Hongmei2, Hu Zhengyi2, An Chunlei2, Jiang Su2, Li Yuansheng2   

  • Received:2018-08-24 Revised:2018-10-13 Online:2019-06-30 Published:2019-06-30
  • Contact: Tao GuiSHI

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摘要：

硝酸根(NO– 3)是南极雪冰中主要的化学离子之一, 过去对雪冰NO– 3记录与气候环境信息的关联开展了广泛研究。然而, 不同于雪冰中其他化学离子, NO– 3沉积进入雪层中会发生一系列复杂的沉积后过程, 给定量解读雪冰NO– 3的气候环境信息带来了严峻挑战。NO– 3的稳定同位素构成则为定量解译大气氮的来源、氧化剂的相对丰度等提供了有力工具, 受样品量(尤其是冰芯)和含量所限, 目前对南极雪冰中NO– 3稳定同位素研究仍非常薄弱。本文综述了目前南极雪冰中NO– 3稳定同位素的空间分布特征和主要影响因素、NO– 3的沉积后过程和相关机制及南极雪冰中NO– 3稳定同位素记录, 并指出了目前研究存在的主要问题, 探讨了未来南极雪冰中NO– 3稳定同位素可能的研究重点和方向。

关键词: 南极雪冰, 硝酸根, 稳定同位素

Abstract:

As a major chemical component in Antarctic snow and ice, nitrate (NO– 3) has been widely investigated, as these data can potentially deliver information on the past climate. Unlike other chemical ions (e.g., Na+ and K+), NO– 3 is not irreversibly deposited into snowpacks, as it will undergo post-depositional processing, which will significantly affect the initial atmospheric information and hamper the interpretation of ice-core records. The isotopic composition of NO– 3 can deliver more information than possible with determinations of the concentration alone; that is, the nitrogen and oxygen isotopes can suggest the sources of NOx and the oxidation capability of the atmosphere. Owing to limited amounts in samples, especially ice cores, and the low concentrations of NO– 3 in Antarctic snow and ice, investigations on isotopes of NO– 3 are rare, and the isotopes of NO– 3 in Antarctica are far from understood. We discuss the spatial distribution patterns of NO– 3 isotopes and possible influencing factors across the Antarctic ice sheet. Furthermore, we summarize the post-depositional processes of NO– 3 in snowpack, and its main mechanisms, and review the available reports on NO– 3 isotope records in Antarctic snow pit and ice cores. Lastly, the main shortcomings of available studies are discussed, and potential research directions on NO– 3 isotopes in Antarctic snow and ice are pointed out.

Key words: Antarctic snow, nitrate, stable isotopes