Dampened predictable decadal North Atlantic climate fluctuations due to ice melting

Dampened predictable decadal North Atlantic climate fluctuations due to ice melting
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由于冰融化抑制了可预测的北大西洋十年气候波动

DOI:
10.1038/s41561-023-01145-y
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发表时间:
2023
期刊:
影响因子:
18.3
通讯作者:
Martin-Puertas C
Martin-Puertas C
中科院分区:
地球科学1区
文献类型:
--
作者:
Martin-Puertas C

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在仪器记录之前,气候系统在十年时间尺度上的振荡行为很难量化。然而,了解这种可变性对于将当前的变化置于背景中并支持可靠的未来预测非常重要。在这里,我们调查的经常性组成部分,全新世气候变化在北大西洋部门从10,500年到2,000年前进行的频率分析,每年层压气候记录在英格兰的一个湖泊和输出从一个长期的瞬态模拟大西洋纬向翻转环流。我们发现在过去的6,700年和现在之前的8,500年中,十年变化是一致的,这可能反映了太阳和海洋强迫的主导作用。在这些日期之间,气候变率在十年时间尺度上受到抑制。我们的研究结果表明,融水排放到北大西洋和随后的水文变化,从开放的哈德逊湾,直到劳伦泰德冰盖的最后崩溃,扰乱了十年周期信号超过一千年。鉴于目前格陵兰冰盖融化的加速以应对全球变暖,这项研究提供了预测气候系统未来模式的潜在挑战的长期证据。
The oscillatory behaviour of the climate system on decadal timescales before the instrumental record is hard to quantify. However, knowledge of this variability is important for putting current changes in context and for supporting reliable future predictions. Here we investigate the recurrent component of Holocene climate variability in the North Atlantic sector from 10,500 to 2,000 years ago by conducting a frequency analysis of both an annually laminated climate record from a lake in England and outputs from a long transient simulation of the Atlantic meridional overturning circulation. We find consistent decadal variability over the past 6,700 years and before 8,500 years before present, probably reflecting predominance of solar and ocean forcings. Between these dates, climate variability was dampened on decadal timescales. Our results suggest that meltwater discharge into the North Atlantic and the subsequent hydrographic changes, from the opening of the Hudson Bay until the final collapse of the Laurentide Ice Sheet, disrupted the decadal cyclic signals for more than a millennium. Given the current acceleration of the Greenland Ice Sheet melting in response to global warming, this study provides long-term evidence of potential challenges predicting future patterns of the climate system.
最终劳伦泰冰盖冰川消退和全新世气候-海平面变化
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