Accumulation in coastal West Antarctic ice core records and the role of cyclone activity
Accumulation in coastal West Antarctic ice core records and the role of cyclone activity
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DOI：
10.1002/2017gl074722
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发表时间：
2017-09
影响因子：
5.2
通讯作者：
J. Hosking;R. Fogt;E. Thomas;V. Moosavi;T. Phillips;Jack H. J. Coggins;D. Reusch
中科院分区：
文献类型：
--
作者：
J. Hosking;R. Fogt;E. Thomas;V. Moosavi;T. Phillips;Jack H. J. Coggins;D. Reusch
气旋是南极气候变化的重要组成部分，但量化其对极地环境的影响具有挑战性。我们评估了穿过别林斯高晋海的气旋如何影响南极洲西部埃尔斯沃思地的积累，我们在那里有两个冰芯记录。我们使用自组织映射 (SOM)（一种无监督机器学习技术）将旋风分为九个 SOM 节点，其轨迹不同（1980-2015）。与第一个 SOM 节点（SOM1，通常源自南太平洋低纬度地区）相关的气旋年度频率与年累积量显着相关（p < 0.001），在秋季发现季节相关性最高（p < 0.001）。虽然南太平洋上空垂直积分水汽的显着增加（p < 0.01）与同一组气旋同时发生，但我们没有发现任何迹象表明这导致在短时间内进入埃尔斯沃斯地的水汽平流增加或积累。
Cyclones are an important component of Antarctic climate variability, yet quantifying their impact on the polar environment is challenging. We assess how cyclones which pass through the Bellingshausen Sea affect accumulation over Ellsworth Land, West Antarctica, where we have two ice core records. We use self‐organizing maps (SOMs), an unsupervised machine learning technique, to group cyclones into nine SOM nodes differing by their trajectories (1980–2015). The annual frequency of cyclones associated with the first SOM node (SOM1, which generally originate from lower latitudes over the South Pacific Ocean) is significantly (p < 0.001) correlated with annual accumulation, with the highest seasonal correlations (p < 0.001) found during autumn. While significant (p < 0.01) increases in vertically integrated water vapor over the South Pacific Ocean coincide with this same group of cyclones, we find no indication that this has led to an increase in moisture advection into, nor accumulation over, Ellsworth Land over this short time period.