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Chronological characteristics for snow accumulation on Styx Glacier in northern Victoria Land, Antarctica
Journal of Glaciology ( IF 3.4 ) Pub Date : 2020-08-26 , DOI: 10.1017/jog.2020.53
Yalalt Nyamgerel , Yeongcheol Han , Songyi Kim , Sang-Bum Hong , Jeonghoon Lee , Soon Do Hur

Under the potential to reconstruct the past climatic and atmospheric conditions from a deep ice core in the coastal Antarctic site (Styx Glacier), an 8.84 m long firn core (73°50.975′ S, 163°41.640′ E; 1623 m a.s.l.) was initially studied to propose a reliable age scale for the local estimation of snow accumulation rate. The seasonal variations of δ18O, methanesulfonic acid (MSA) and non-sea-salt sulfate (nssSO42–) were used for the firn core dating and revealed 25 annual peaks (from 1990 to 2014) with volcanic sulfate signal. The observed declining trend in annual accumulation rate with a mean value of 146 ± 60 kg m–2 a–1 is likely to be linked to the changes of sea-ice extent in the Ross Sea region. Moreover, the temporal variation of the annual mean δ18O, an annual flux of MSA and nssSO42– also likely to be under the influence of ice-covered and open water area. This study suggests a potential to recover past changes in an oceanic environment and will be useful for the interpretation of the long ice core drilled at the same site.

中文翻译:

南极洲维多利亚地北部冥河冰川积雪年代特征

在从南极沿海地区(冥河冰川)的深层冰芯重建过去气候和大气条件的潜力下,一个 8.84 m 长的冰核(73°50.975′ S,163°41.640′ E;1623 m asl)是最初研究提出了一个可靠的年龄尺度,用于局部估计积雪率。δ 的季节变化18O、甲磺酸(MSA)和非海盐硫酸盐(nssSO42–) 被用于冰核测年,并揭示了 25 个具有火山硫酸盐信号的年度峰值(从 1990 年到 2014 年)。观察到的年累积率下降趋势,平均值为 146 ± 60 kg m–2一种–1可能与罗斯海地区海冰范围的变化有关。此外,年平均 δ 的时间变化18O,MSA 和 nssSO 的年通量42–也可能受到冰雪覆盖和开阔水域的影响。这项研究表明有可能恢复海洋环境过去的变化,并将有助于解释在同一地点钻探的长冰芯。
更新日期:2020-08-26
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