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首页> 外文期刊>Paleoceanography >Climate and biogeochemical response to a rapid melting of the West Antarctic Ice sheet during interglacials and implications for future climate
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Climate and biogeochemical response to a rapid melting of the West Antarctic Ice sheet during interglacials and implications for future climate

机译：气候和生物地球化学对冰期间南极冰盖快速融化的反应及其对未来气候的影响

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摘要

We study the effects of a massive meltwater discharge from the West Antarctic Ice Sheet (WAIS) during interglacials onto the global climate-carbon cycle system using the Earth system model of intermediate complexity LOVECLIM. Prescribing a meltwater pulse in the Southern Ocean that mimics a rapid disintegration of the WAIS, a substantial cooling of the Southern Ocean is simulated that is accompanied by an equatorward expansion of the sea ice margin and an intensification of the Southern Hemispheric Westerlies. The strong halocline around Antarctica leads to suppression of Antarctic Bottom Water (AABW) formation and to subsurface warming in areas where under present-day conditions AABW is formed. This subsurface warming at depths between 500 and 1500 m leads to a thermal weathering of the WAIS grounding line and provides a positive feedback that accelerates the meltdown of the WAIS. Our model results further demonstrate that in response to the massive expansion of sea ice, marine productivity in the Southern Ocean reduces significantly. A retreat of the WAIS, however, does not lead to any significant changes in atmospheric CO 2. The climate signature of a WAIS collapse is structurally consistent with available paleoproxy signals of the last interglacial MIS5e.
机译：我们使用中度复杂度LOVECLIM的地球系统模型研究了在冰间期从南极冰盖（WAIS）大量融化水排放到全球气候-碳循环系统上的影响。在南大洋中规定模拟WAIS迅速崩解的融化水脉冲，模拟了南大洋的大幅降温，伴随着海冰边缘的赤道扩张和南半球西风的加剧。南极周围的强盐环抑制了南极底水（AABW）的形成，并导致了在当今条件下形成AABW的地区的地下变暖。这种在500至1500 m深度处的地下变暖导致WAIS接地线发生热风化，并提供正反馈，从而加速WAIS的融化。我们的模型结果进一步表明，由于海冰的大量扩张，南大洋的海洋生产力显着下降。但是，WAIS的退缩并不会导致大气中CO 2的任何显着变化。WAIS塌陷的气候特征在结构上与最后一个冰间期MIS5e的可用古过氧化物信号一致。

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