Nature2014-06-26 5:33 PM

大西洋对南极洲气候的影响 Impacts of the north and tropical Atlantic Ocean on the Antarctic Peninsula and sea ice

论文摘要 

南极洲的气候已知受到远方、尤其是太平洋中气候状况的影响。然而迄今为止,南极半岛加速变暖及南极海冰重新分布的原因仍不清楚。现在,Xichen Li及同事发现,“阿蒙森海”中海平面压力的变化(这种变化影响该半岛的气温和海冰分布)可以被追溯到由“大西洋多年代振荡”(热带和北大西洋中气候变化的一个持久驱动力)引起的海洋表面温度变化。

Abstract 

In recent decades, Antarctica has experienced pronounced climate changes. The Antarctic Peninsula exhibited the strongest warming of any region on the planet, causing rapid changes in land ice. Additionally, in contrast to the sea-ice decline over the Arctic, Antarctic sea ice has not declined, but has instead undergone a perplexing redistribution. Antarctic climate is influenced by, among other factors, changes in radiative forcing and remote Pacific climate variability, but none explains the observed Antarctic Peninsula warming or the sea-ice redistribution in austral winter. However, in the north and tropical Atlantic Ocean, the Atlantic Multidecadal Oscillation (a leading mode of sea surface temperature variability) has been overlooked in this context. Here we show that sea surface warming related to the Atlantic Multidecadal Oscillation reduces the surface pressure in the Amundsen Sea and contributes to the observed dipole-like sea-ice redistribution between the Ross and Amundsen–Bellingshausen–Weddell seas and to the Antarctic Peninsula warming. Support for these findings comes from analysis of observational and reanalysis data, and independently from both comprehensive and idealized atmospheric model simulations. We suggest that the north and tropical Atlantic is important for projections of future climate change in Antarctica, and has the potential to affect the global thermohaline circulation6 and sea-level change.

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