Regina S Ferreira, Jefferson C Simões, Isaías U Thoen, Ronaldo T Bernardo
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引用次数: 0
Abstract
This study investigated the chemical content of a shallow snow core (4.95 m) named TT 6, collected during a Brazilian traverse of the West Antarctic Ice Sheet in the 2014/2015 Austral summer. Stable isotope ratios (δD and δ18O) and ionic content, determined at the Centro Polar e Climático of the Federal University of Rio Grande do Sul (CPC/UFRGS), were used to date the core and reconstruct the climatic conditions at the site. The core represents approximately 11 years ± 6 months of precipitation, i.e., a mean net snow accumulation rate of 0.19 ± 0.02 m a-1 in water equivalent. Using the non-sea-salt sulfate values, we identified the 2011 Puyhue-Cordón (Chile) volcanic eruption signal, providing a reference horizon for dating. Anions represent 53.73% of the ionic content. We identified that 96.86% of calcium and 84.50% of sulfate are non-sea origin, while the acidic contribution is 25.62% H+. We observed high peaks in marine aerosols containing Na+, Cl-, and Mg2+ during winter, and results from the ERA5 global model (NOAA) indicated that El Niño events could influence Antarctic temperatures, facilitating the transport of marine aerosols to the continent.
这项研究调查了一个名为TT 6的浅层雪芯(4.95米)的化学含量,该雪芯是在2014/2015年南方夏季巴西穿越南极西部冰盖期间收集的。稳定同位素比值(δD和δ18O)和离子含量由南巴西联邦大学(CPC/UFRGS)的Centro Polar e Climático (CPC/UFRGS)测定,用于确定岩心的年代并重建现场的气候条件。核心代表了大约11年±6个月的降水,即平均净积雪率为0.19±0.02 ma -1(水当量)。利用非海盐硫酸盐值,我们确定了2011年Puyhue-Cordón(智利)火山爆发信号,为测年提供了参考水平。阴离子占离子含量的53.73%。结果表明,其中96.86%的钙和84.50%的硫酸盐为非海源,而酸性贡献为25.62%的H+。我们在冬季观测到含有Na+、Cl-和Mg2+的海洋气溶胶的高峰,并且来自ERA5全球模式(NOAA)的结果表明El Niño事件可能影响南极温度,促进海洋气溶胶向大陆的运输。
期刊介绍:
The Brazilian Academy of Sciences (BAS) publishes its journal, Annals of the Brazilian Academy of Sciences (AABC, in its Brazilianportuguese acronym ), every 3 months, being the oldest journal in Brazil with conkinuous distribukion, daking back to 1929. This scienkihic journal aims to publish the advances in scienkihic research from both Brazilian and foreigner scienkists, who work in the main research centers in the whole world, always looking for excellence.
Essenkially a mulkidisciplinary journal, the AABC cover, with both reviews and original researches, the diverse areas represented in the Academy, such as Biology, Physics, Biomedical Sciences, Chemistry, Agrarian Sciences, Engineering, Mathemakics, Social, Health and Earth Sciences.