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Holocene Southern Ocean surface temperature variability west of the Antarctic Peninsula

机译：南极半岛西部全新世南部海洋表面温度的变化

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摘要

The disintegration of ice shelves, reduced sea-ice and glacier extent, and shifting ecological zones observed around Antarctica highlight the impact of recent atmospheric and oceanic warming4 on the cryosphere. Observations and models suggest that oceanic and atmospheric temperature variations at Antarctica's margins affect global cryosphere stability, ocean circulation, sea levels and carbon cycling. In particular, recent climate changes on the Antarctic Peninsula have been dramatic, yet the Holocene climate variability of this region is largely unknown, limiting our ability to evaluate ongoing changes within the context of historical variability and underlying forcing mechanisms. Here we show that surface ocean temperatures at the continental margin of the western Antarctic Peninsula cooled by 3-4 ℃ over the past 12,000years, tracking the Holocene decline of local (65°S) spring insolation. Our results, based on TEX_(86) sea surface temperature (SST) proxy evidence from a marine sediment core, indicate the importance of regional summer duration as a driver of Antarctic seasonal sea-ice fluctuations7. On millennial timescales, abrupt SST fluctuations of 2-4℃ coincide with globally recognized climate variability. Similarities between our SSTs, Southern Hemisphere westerly wind reconstructions and El Nino/Southern Oscillation variability indicate that present climate teleconnections between the tropical Pacific Ocean and the western Antarctic Peninsula strengthened late in the Holocene epoch. We conclude that during the Holocene, Southern Ocean temperatures at the western Antarctic Peninsula margin were tied to changes in the position of the westerlies, which have a critical role in global carbon cycling.
机译：冰架的解体，海冰和冰川范围的减少以及南极洲周围观察到的生态区的变化突出了近期大气和海洋变暖对冰冻圈的影响4。观测和模型表明，南极边缘的海洋和大气温度变化会影响全球冰冻圈稳定性，海洋环流，海平面和碳循环。尤其是，南极半岛最近的气候变化是戏剧性的，但是该地区的全新世气候变率很大程度上未知，这限制了我们在历史变率和潜在强迫机制的背景下评估正在进行的变化的能力。在这里，我们显示了过去12,000年南极半岛西部大陆边缘的地表海洋温度降低了3-4℃，追踪了局部春季（65°S）春季全新世的下降。我们的结果基于来自海洋沉积物核心的TEX_（86）海表温度（SST）替代证据，表明区域夏季持续时间对于推动南极季节性海冰波动具有重要意义7。在千禧年尺度上，SST的2-4突变是与全球公认的气候变化一致的。我们的海表温度，南半球西风重建和厄尔尼诺/南方涛动变化之间的相似性表明，在全新世晚期，热带太平洋和南极西部半岛之间目前的气候遥相关性增强了。我们得出结论，在全新世期间，南极半岛西部边缘的南大洋温度与西风位置的变化有关，这在全球碳循环中起着至关重要的作用。

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  • 来源
    《Nature》 |2011年第7333期|p.250-254|共5页
  • 作者

    A. E. Shevenell; A. E. Ingalls; E. W. Domack; C. Kelly;

  • 作者单位

    School of Oceanography, University of Washington, Seattle, Washington 98195, USA,Departments of Geography and Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK;

    rnSchool of Oceanography, University of Washington, Seattle, Washington 98195, USA;

    rnDepartment of Geosciences, Hamilton College, Clinton, New York 13323, USA;

    rnSchool of Oceanography, University of Washington, Seattle, Washington 98195, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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