Simulating the Last Interglacial Greenland stable water isotope peak: The role of Arctic sea ice changes

Simulating the Last Interglacial Greenland stable water isotope peak: The role of Arctic sea ice changes
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模拟最后一次间冰期格陵兰稳定水同位素峰:北极海冰变化的作用

DOI:
10.1016/j.quascirev.2018.07.027
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发表时间:
2018
影响因子:
4
通讯作者:
Malmierca-Vallet I
Malmierca-Vallet I
中科院分区:
地球科学1区
文献类型:
--
作者:
Malmierca-Vallet I

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在末次间冰期(LIG),格陵兰深层冰芯中测得的稳定水同位素值(δ 18 O)至少比现在高2.5‰。以前对LIG的同位素气候模拟没有捕捉到观测到的格陵兰岛δ 18 O的增加。在这里,我们使用的同位素启用HadCM 3(英国气象局耦合大气-海洋环流模型),以调查是否撤退的北方半球海冰负责这个模型数据的分歧。我们的研究结果突出了海冰变化对LIG格陵兰同位素最大值的潜在意义。北极海冰的减少加上海面温度的升高,影响了δ 18 O:富含重同位素的水蒸气和较短的蒸馏路径都可能增加格陵兰上空的δ 18 O值。我们首次表明,模拟对北极海冰减少的响应能够在NEEM、NGRIP、GIPS 2和Camp世纪冰芯站点产生可能的LIG δ 18 O增加幅度。然而,我们可能低估了Renland,DYE 3和GRIP冰芯位置的δ 18 O变化。考虑到可能的冰盖变化,可能需要产生一个更好的适合LIG冰芯δ 18 O值。
Last Interglacial (LIG), stable water isotope values (δ18O) measured in Greenland deep ice cores are at least 2.5‰ higher compared to the present day. Previous isotopic climate simulations of the LIG do not capture the observed Greenland δ18O increases. Here, we use the isotope-enabled HadCM3 (UK Met Office coupled atmosphere-ocean general circulation model) to investigate whether a retreat of Northern Hemisphere sea ice was responsible for this model-data disagreement. Our results highlight the potential significance of sea ice changes on the LIG Greenland isotopic maximum. Sea ice loss in combination with increased sea surface temperatures, over the Arctic, affect δ18O: water vapour enriched in heavy isotopes and a shorter distillation path may both increase δ18O values over Greenland. We show, for the first time, that simulations of the response to Arctic sea ice reduction are capable of producing the likely magnitude of LIG δ18O increases at NEEM, NGRIP, GIPS2 and Camp Century ice core sites. However, we may underestimate δ18O changes at the Renland, DYE3 and GRIP ice core locations. Accounting for possible ice sheet changes is likely to be required to produce a better fit to the LIG ice core δ18O values.
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