用冰盖-气候耦合模型研究倒数第二和最后一次冰川终结的异同

IF 3.8 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Aurélien Quiquet, Didier M. Roche
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引用次数: 0

摘要

摘要冰川结束的标志是气候系统不同组成部分的重组。特别是,冰盖的迅速解体会导致多种复杂的反馈回路,而人们对这些反馈回路的了解还很不够。为了进一步研究这方面的问题,我们在这里使用了一个完全耦合的北半球冰盖-气候模型,对最近两次冰川终止进行了数值实验。我们的研究表明,即使两次冰川终止的一阶气候轨迹相似,但太阳日照的不同会导致冰原-气候系统发生重要变化。与全新世相比,倒数第二个终结期较高的温度与末次间冰期较高的海平面是一致的。我们模拟了格陵兰岛在末次冰期对海平面上升的贡献,大约相当于 2 米的海平面。我们还模拟了更温暖的南大洋次表层,这与南极冰盖的额外贡献是一致的。此外,即使不考虑冰盖融化导致的淡水流入海洋的情况,大西洋倾覆环流的两个终止点也显示出不同的敏感性,在倒数第二个终止点,大西洋倾覆环流更容易崩溃。最后,通过额外的敏感性实验,我们表明,对于这两个终止期,北半球日照是冰盖退缩的主要驱动力,即使在模拟完全消融时也必须考虑植被变化。相反,尽管温室气体浓度变化会影响温度,但它本身并不能解释冰盖退缩的幅度,而只能调节其时间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigating similarities and differences of the penultimate and last glacial terminations with a coupled ice sheet–climate model
Abstract. Glacial terminations are marked by a re-organisation of the different components of the climate system. In particular, rapid ice sheet disintegration leads to multiple complex feedback loops that are still poorly understood. To further investigate this aspect, we use here a fully coupled Northern Hemisphere ice sheet–climate model to perform numerical experiments of the last two glacial terminations. We show that even if the first-order climate trajectory is similar for the two terminations, the difference in terms of solar insolation leads to important changes for the ice sheet–climate system. Warmer temperatures during the penultimate termination are compatible with higher sea level during the last interglacial period with respect to the Holocene. We simulate a last interglacial Greenland contribution to sea level rise of about 2 m of sea level equivalent. We also simulate warmer subsurface Southern Ocean, compatible with an additional contribution from the Antarctic ice sheet. In addition, even without considering freshwater flux to the ocean resulting from ice sheet melting, the two terminations display different Atlantic overturning circulation sensitivity, this circulation being more prone to collapses during the penultimate termination. Finally, with additional sensitivity experiments we show that, for the two terminations, the Northern Hemisphere insolation is the main driver for the ice sheet retreat even if vegetation changes have also to be taken into account to simulate the full deglaciation. Conversely, even though it impacts the temperature, greenhouse gas concentration change alone does not explain the amplitude of ice sheet retreat and only modulates its timing.
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来源期刊
Climate of The Past
Climate of The Past 地学-气象与大气科学
CiteScore
7.40
自引率
14.00%
发文量
120
审稿时长
4-8 weeks
期刊介绍: Climate of the Past (CP) is a not-for-profit international scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on the climate history of the Earth. CP covers all temporal scales of climate change and variability, from geological time through to multidecadal studies of the last century. Studies focusing mainly on present and future climate are not within scope. The main subject areas are the following: reconstructions of past climate based on instrumental and historical data as well as proxy data from marine and terrestrial (including ice) archives; development and validation of new proxies, improvements of the precision and accuracy of proxy data; theoretical and empirical studies of processes in and feedback mechanisms between all climate system components in relation to past climate change on all space scales and timescales; simulation of past climate and model-based interpretation of palaeoclimate data for a better understanding of present and future climate variability and climate change.
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