Early start of 20th-century Arctic sea-ice decline recorded in Svalbard coralline algae
Early start of 20th-century Arctic sea-ice decline recorded in Svalbard coralline algae
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斯瓦尔巴群岛珊瑚藻记录了20世纪北极海冰减少的早期开始
作者：
Hetzinger;Halfar;Zajacz;Wisshak
北极海冰的快速减少是全球气候变化持续的一个先行指标，并受到公众和科学界的广泛关注。预测表明，随着北极迅速变暖，北极夏季海冰可能在未来 50 甚至 30 年内几乎消失。然而，有限的观测记录和缺乏年度分辨率的海洋海冰代理阻碍了对海冰长期变化的评估，导致全球变暖下海冰未来演变的预测存在很大的不确定性。在这里，我们使用强烈依赖于光可用性的长寿结壳珊瑚藻作为新的原位代理来重建季节性海冰覆盖持续时间的过去变化。我们的数据代表了迄今为止最北端的年度分辨率海洋海冰重建，一直延伸到 19 世纪初斯瓦尔巴群岛附近。藻类记录显示，北极高地海冰覆盖面积的减少趋势早在 20 世纪初就已开始，早于之前根据陆地档案重建海冰的报道。我们的数据进一步表明，尽管海冰范围在数十年时间尺度上有所不同，但过去 200 年内海冰最低值出现在 20 世纪末。
The fast decline of Arctic sea ice is a leading indicator of ongoing global climate change and is receiving substantial public and scientific attention. Projections suggest that Arctic summer sea ice may virtually disappear within the course of the next 50 or even 30 yr with rapid Arctic warming. However, limited observational records and lack of annual-resolution marine sea-ice proxies hamper the assessment of long-term changes in sea ice, leading to large uncertainties in predictions of its future evolution under global warming. Here, we use long-lived encrusting coralline algae that strongly depend on light availability as a new in situ proxy to reconstruct past variability in the duration of seasonal sea-ice cover. Our data represent the northernmost annual-resolution marine sea-ice reconstruction to date, extending to the early 19thcentury off Svalbard. Algal records show that the decreasing trend in sea-ice cover in the high Arctic had already started at the beginning of the 20thcentury, earlier than previously reported from sea-ice reconstructions based on terrestrial archives. Our data further suggest that, although sea-ice extent varies on multidecadal time scales, the lowest sea-ice values within the past 200 yr occurred at the end of the 20thcentury.
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影响因子：
1.7
作者：
Jorgensbye, Helle I. O.;Halfar, Jochen
通讯作者：
Halfar, Jochen
影响因子：
5.8
作者：
Halfar, J.;Williams, B.;Wanamaker, A. D., Jr.
通讯作者：
Wanamaker, A. D., Jr.
密形笼形珊瑚藻 Mg/Ca 比率的再现性以及与高分辨率海面温度数据的比较
DOI：
10.1016/j.gca.2017.09.044
发表时间：
2018
期刊：
影响因子：
--
作者：
Hetzinger;Halfar;Steneck
通讯作者：
Steneck
DOI：
10.1016/j.palaeo.2010.04.009
发表时间：
2011-03-01
影响因子：
3
作者：
Halfar, J.;Hetzinger, S.;Jacob, D. E.
通讯作者：
Jacob, D. E.
DOI：
10.1029/2018jg004385
发表时间：
2018
期刊：
Journal of Geophysical Research: Biogeosciences
影响因子：
--
作者：
Williams;Halfar;Hetzinger;Blicher;Juul-Pedersen;Broeke
通讯作者：
Broeke