The Southern Hemisphere at glacial terminations: insights from the Dome C ice core
The Southern Hemisphere at glacial terminations: insights from the Dome C ice core
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DOI：
10.5194/cp-4-345-2008
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发表时间：
2008-12
影响因子：
4.3
通讯作者：
R. Röthlisberger;M. Mudelsee;M. Bigler;M. D. Angelis;H. Fischer;M. Hansson;F. Lambert;V. Masson‐Delmotte;L. Sime;R. Udisti;E. Wolff
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作者：
R. Röthlisberger;M. Mudelsee;M. Bigler;M. D. Angelis;H. Fischer;M. Hansson;F. Lambert;V. Masson‐Delmotte;L. Sime;R. Udisti;E. Wolff
来自欧洲南极洲冰心项目（EPICA）冰穹C冰芯的许多不同的代用记录首次允许非常详细地比较九个冰川终止。尽管事实上所有的终末都涵盖了从最大冰期到间冰期的过渡，但单个终末之间存在很大差异。对于某些终端，南极温度仅适度增加，而对于其他终端，变化幅度要大得多。对于不同的终端，温度的变化率比变化的幅度或持续时间更相似。这些温度变化伴随着整个南极洲的尘埃和海盐沉积的巨大变化。在这里，我们调查了南美尘代理（非海盐钙通量，nssCa 2+），海冰代理（海盐钠通量，ssNa+）和南极温度代理（氘，D）之间的相位。特别是，我们看看是否一个类似的事件序列适用于所有的终端，尽管他们的不同特点。所有代理人都来自EPICA圆顶C冰芯，导致代理人之间的相对测年不确定性小于20年。在终止开始时，温度（D）上升和粉尘（nssCa2+通量）下降同步开始.然而，海冰代用指标（ssNa+通量）仅发生一次变化
The many different proxy records from the Euro- pean Project for Ice Coring in Antarctica (EPICA) Dome C ice core allow for the first time a comparison of nine glacial terminations in great detail. Despite the fact that all termi- nations cover the transition from a glacial maximum into an interglacial, there are large differences between single ter- minations. For some terminations, Antarctic temperature in- creased only moderately, while for others, the amplitude of change at the termination was much larger. For the different terminations, the rate of change in temperature is more simi- lar than the magnitude or duration of change. These temper- ature changes were accompanied by vast changes in dust and sea salt deposition all over Antarctica. Here we investigate the phasing between a South Ameri- can dust proxy (non-sea-salt calcium flux, nssCa 2+ ), a sea ice proxy (sea salt sodium flux, ssNa + ) and a proxy for Antarc- tic temperature (deuterium, D). In particular, we look into whether a similar sequence of events applies to all termina- tions, despite their different characteristics. All proxies are derived from the EPICA Dome C ice core, resulting in a relative dating uncertainty between the proxies of less than 20 years. At the start of the terminations, the temperature ( D) in- crease and dust (nssCa 2+ flux) decrease start synchronously. The sea ice proxy (ssNa + flux), however, only changes once