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西南极洲的一个雪芯的冰化学和环境解释

Regina S Ferreira¹, Jefferson C Simões^1,2, Isaías U Thoen¹

¹Universidade Federal do Rio Grande do Sul, Centro Polar e Climático, Av. Bento Gonçalves, 9500, 91501-970 Porto Alegre, RS, Brazil.

Anais da Academia Brasileira de Ciencias

|December 19, 2024

概括

这项研究分析了西南极雪核,揭示了它的化学成分和大约11年的气候数据. 确定了2011年的火山爆发,以及海洋气溶的影响和厄尔尼诺对南极温度的影响.

科学领域:

* 冰川学和气候科学
* 古气候学古代气候学
* 大气化学

背景情况:

*了解南极冰芯对于重建过去的气候条件至关重要.
* 西南极冰盖保存了大气沉积和环境变化的宝贵档案.
* 准确的冰芯日期对于可靠的气候重建至关重要.

研究的目的:

* 为了确定一个浅的南极雪核 (TT 6) 的化学成分.
* 为了重建过去的气候条件和收集地点的积雪率.
* 识别火山爆发信号,评估海洋气溶和气候模式的影响.

主要方法:

*分析稳定同位素比 (δD和δ18O) 用于年代和气候重建.
* 确定离子含量 (离子和) 以了解大气沉积情况.
*使用2011年普伊休-科尔登火山喷发作为时间标记.
*使用ERA5全球模型将气候模式与气溶运输相关联.

主要成果:

* 雪芯代表了大约11年的积累,平均净速率为0.19 m a-1 (水等效).
*确定了2011年Puyhue-Cordón火山爆发的信号,证实了日期的准确性.
*非海盐硫酸盐和占主导的离子含量,表明陆地来源.
*在冬季观察到海上气溶 (Na+,Cl-,Mg2+) 的升高,可能与影响运输的厄尔尼诺现象有关.

结论:

* TT 6 雪芯提供了关于南极环境条件的有价值的,虽然短暂的记录.
*火山爆发和海洋气溶运输显著影响西南极冰盖的化学特征.
* 厄尔尼诺南部振荡事件可能在调节南极洲海洋气溶沉积方面发挥作用.

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