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Recent variability of atmospheric circulation patterns inferred from East Antarctica glaciochemical records
Geochemistry ( IF 3.7 ) Pub Date : 2019-11-08 , DOI: 10.1016/j.chemer.2019.125554
E.Y. Osipov , O.P. Osipova , T.V. Khodzher

In this study, by using ion chromatography, we analyzed the chemical composition of snow deposited in 1976–2012 at three sites within the Indian Ocean sector of East Antarctica (VK-55, SW-42, and PV-10) to establish the relationships between the formation of the chemical composition of snow and varying mechanisms of atmospheric circulation. Dating of samples was carried out on the basis of sulphate peaks related to the material derived from the Pinatubo volcanic eruption (1991). Chemical compositions of snow showed spatial inhomogeneity even over relatively short distances (of about 40 km) in central East Antarctica. The reasons for the inhomogeneity may have been related to local topography and snow redistribution by wind in areas with extremely low accumulation, as well as to peculiarities of atmospheric circulation processes. According to the principal component analysis (PCA) and 5-day backward trajectories, it was determined that for site PV-10 (400 km from the Indian Ocean coast), zonal circulation in the lower troposphere associated with the cyclonic centers of the Southern Ocean was a leading process while the inland sites (VK-55 and SW-42) were influenced by a combination of processes involving meridional circulation, air mass transport, and transformation in the troposphere over the Antarctic continent.



中文翻译:

从南极东部冰川化学记录推断的大气环流模式的近期变化

在这项研究中,我们使用离子色谱法分析了1976-2012年在南极东部印度洋海域三个地点(VK-55,SW-42和PV-10)积雪的化学成分,以建立关系积雪的化学成分形成与大气环流变化机制之间的关系。根据与皮纳图博火山喷发(1991)产生的物质有关的硫酸盐峰进行样品测年。即使在南极东部中部的相对较短距离(约40 km)上,雪的化学成分也显示出空间不均匀性。不均匀性的原因可能与积聚极少的地区的局部地形和风雪重新分布以及大气环流过程的特殊性有关。

更新日期:2019-11-08
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