Antarctic sea-ice in a changing planet - insights from palaeoclimate archives.

海冰目前正在发生重大变化。在北极，海冰在过去几十年里一直在迅速减少，预计由于冰的反照率反馈，全球气候变化将被放大。相反，自1970年代末开始进行系统的卫星观测以来，南极海冰总覆盖面积一直在稳步增加，尽管自2014年以来急剧减少，使1979-2018年相比1979-2014年的增加趋势减半[1]。对南极和北极海冰状况的观测仅限于卫星时代(1970年后)。因此，很难评估最近趋势的重要性。气候模型对未来变暖的模拟严重依赖于历史海冰面积数据[2]，因此我们提供可靠的古海冰重建以确保预测未来变化的气候模型得到充分优化具有全球重要性。

Sea ice is currently undergoing major changes. In the Arctic, sea ice has been declining rapidly over the last few decades, with an expectation of amplified global climate change due to ice-albedo feedbacks. Conversely, the total Antarctic sea ice cover has been steadily increasing since systematic satellite observations began in the late 1970s, although a precipitous decline since 2014 has halved the increasing trend for 1979-2018 relative to 1979-2014 [1]. Observations of both Antarctic and Arctic sea ice conditions are limited to the satellite era (post 1970). Thus, it is hard to assess the significance of recent trends. Climate model simulations of future warming are heavily dependent on the historical sea ice area data [2], and thus it is of global importance that we provide reliable paleo-sea ice reconstructions to ensure that the climate models tasked with predicting future changes are fully optimised.