The spatial and seasonal distributions of air-transport origins to the Antarctic based on 5-day backward trajectory analysis

The spatial and seasonal distributions of air-transport origins to the Antarctic based on 5-day backward trajectory analysis
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基于5天后向轨迹分析的南极航空运输始发地空间和季节分布

DOI:
10.1016/j.polar.2013.08.001
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发表时间:
2013
期刊:
T, Polar Science
影响因子:
--
通讯作者:
H. Motoyama
H. Motoyama
中科院分区:
--
文献类型:
--
作者:
Suzuki;K.;T. Yamanouchi;K. Kawamura;H. Motoyama

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向南极输送的含湿空气是控制冰盖物质平衡的重要因素之一。在这里,我们调查的分布,使用后向轨迹分析在整个南极冰盖的空气包裹运输的基础上,无论是位于南极洲内部或外部在5天前到达。在这个时候,我们认为来自南极洲以外的空气富含水分。海洋空气被发现占主导地位的西南极洲全年,而来自内陆的空气更突出地分布在东南极洲,特别是在夏季。在东南极洲,有一个显着的季节变化:来自内陆的空气在夏季占主导地位,而海洋来源的空气在冬季占主导地位。来自海洋/内陆来源的气包的分布与(根据卫星数据得出的)积聚图相似,这表明海洋气包可以替代向南极输送的湿气。确定气候变化的未来影响(例如,海平面上升),将需要更精确地预测表面物质平衡的变化。我们的研究结果有助于更好地了解在南极雪和冰芯中发现的积累和气溶胶的空间分布。
Transport of moisture-bearing air to the Antarctic is one of the important factors that control the mass balance of the ice sheet. Here, we investigate the distribution of air-parcel transport using a backward trajectory analysis over the entire Antarctic ice sheet, based on whether the air parcel was located inside or outside of Antarctica at 5 days before arrival. At this time, we considered the air from outside Antarctica to be moisture rich. Oceanic air was found to dominate in West Antarctica throughout the year, whereas air from inland was more prominently distributed around East Antarctica, especially in summer. In East Antarctica, there was a significant seasonal variation: air from inland dominated in summer, while air of oceanic origin dominated in winter. The distribution of air parcels that came from oceanic/inland sources was similar to the accumulation map (based on satellite data), which indicates that oceanic air parcels could be a substitute for moisture transport to the Antarctic. To determine the future impacts of climate change (e.g., sea level rise), more precise predictions of the variations in the surface mass balance will be required. Our results contribute towards the improved understanding of the spatial distributions of accumulation and aerosols found in Antarctic snow and ice cores.
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