Fast recovery of North Atlantic sea level in response to atmospheric carbon dioxide removal

IF 8.1 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES Communications Earth & Environment Pub Date : 2024-11-03 DOI:10.1038/s43247-024-01835-4
Sunhee Wang, Yechul Shin, Ji-Hoon Oh, Jong-Seong Kug
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Abstract

Sea level rise due to anthropogenic warming threatens coastal environments and human societies, but its regional reversibility under successful climate mitigation efforts remains unclear. Here, we investigate sea level fluctuations in the Subpolar North Atlantic using idealized atmospheric carbon dioxide ramp-up and -down experiments. During the ramp-up period, the Subpolar North Atlantic experiences a faster sea level rise than the global mean, followed by a more rapid sea level decline over several dacades with decreasing carbon dioxide. These rapid sea level fluctuations are mainly driven by the response of the Atlantic Meridional Overturning Circulation to carbon dioxide forcing. The enhanced meridional salinity transport triggered by the rapid recovery of the Atlantic Meridional Overturning Circulation plays a crucial role in the regional sea level decline. Our study highlights the potential for pronounced sea level changes in the Subpolar North Atlantic and surrounding coastal areas under climate mitigation scenarios. The Atlantic Meridional Overturning Circulation’s response to carbon dioxide forcing is crucial for rapid sea level fluctuations in the Subpolar North Atlantic, indicating potential for fast changes under climate mitigation scenarios, according to results from carbon dioxide ramp-up and -down experiments to investigate sea level variation.

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北大西洋海平面因大气中二氧化碳的清除而快速恢复
人为变暖导致的海平面上升威胁着沿海环境和人类社会,但在成功的气候减缓努力下,其区域可逆性仍不明确。在这里,我们利用理想化的大气二氧化碳上升和下降实验研究了北大西洋副极地的海平面波动。在上升期,北大西洋副极地的海平面上升速度快于全球平均水平,随后随着二氧化碳的减少,海平面在数十年内迅速下降。这些快速的海平面波动主要是由大西洋经向翻转环流对二氧化碳强迫的反应所驱动的。大西洋经向翻转环流的快速恢复所引发的经向盐度输送增强在区域海平面下降中发挥了关键作用。我们的研究强调,在气候减缓情景下,北大西洋副极地及周边沿海地区的海平面可能会发生明显变化。根据研究海平面变化的二氧化碳增量和减量实验结果,大西洋经向翻转环流对二氧化碳强迫的响应对北大西洋次极地海平面的快速波动至关重要,表明在气候减缓情景下海平面有可能发生快速变化。
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来源期刊
Communications Earth & Environment
Communications Earth & Environment Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
8.60
自引率
2.50%
发文量
269
审稿时长
26 weeks
期刊介绍: Communications Earth & Environment is an open access journal from Nature Portfolio publishing high-quality research, reviews and commentary in all areas of the Earth, environmental and planetary sciences. Research papers published by the journal represent significant advances that bring new insight to a specialized area in Earth science, planetary science or environmental science. Communications Earth & Environment has a 2-year impact factor of 7.9 (2022 Journal Citation Reports®). Articles published in the journal in 2022 were downloaded 1,412,858 times. Median time from submission to the first editorial decision is 8 days.
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