the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Shoaled glacial AMOC despite vigorous tidal Dissipation: Vertical Stratification matters
Abstract. During the Last Glacial Maximum (LGM), tidal dissipation was about threefold higher than today, which could have led to a considerable increase in vertical mixing. This would enhance the glacial Atlantic Meridional Overturning Circulation (AMOC), contradicting the shoaled AMOC as indicated by paleo proxies. Here, we conduct ocean model simulations to investigate the impact of background climate conditions and tidal mixing on the AMOC during LGM. We successfully reproduce the stratified ocean characteristic of the LGM by accurately simulating the elevated salinity of the deep sea and the rapid temperature decrease in the ocean's upper layers. Our findings indicate that show that the shoaled glacial AMOC is mainly due to strong glacial ocean stratification, irrespective of enhanced tidal dissipation. However, glacial tidal dissipation plays a critical role in the intensification of the AABW during the LGM. Given the critical role of AMOC in (de-)glacial climate evolution, our results highlight the complex interactions of ocean stratification and tidal dissipation that have been neglected so far.
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Status: final response (author comments only)
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RC1: 'Comment on cp-2024-23', Anonymous Referee #1, 27 Apr 2024
The comment was uploaded in the form of a supplement: https://cp.copernicus.org/preprints/cp-2024-23/cp-2024-23-RC1-supplement.pdf
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AC1: 'Reply on RC1', Yugeng Chen, 03 May 2024
The comment was uploaded in the form of a supplement: https://cp.copernicus.org/preprints/cp-2024-23/cp-2024-23-AC1-supplement.pdf
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RC2: 'Reply on AC1', Anonymous Referee #1, 03 May 2024
The authors have done a thorough job of responding to my comments. I am satisfied with their response. Will a revised manuscript be posted? I'll be happy to look at the revision when it comes out.
Citation: https://doi.org/10.5194/cp-2024-23-RC2 -
AC2: 'Reply on RC2', Yugeng Chen, 04 May 2024
We thank the reviewer for their positive feedback on our response. According to the interactive review process, we will be able to submit a revised manuscript upon the invitation of the editor, following the conclusion of the open discussion.
Citation: https://doi.org/10.5194/cp-2024-23-AC2
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AC2: 'Reply on RC2', Yugeng Chen, 04 May 2024
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RC2: 'Reply on AC1', Anonymous Referee #1, 03 May 2024
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AC1: 'Reply on RC1', Yugeng Chen, 03 May 2024
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RC3: 'Comment on Chen et al. Shoaled glacial AMOC despite vigorous tidal Dissipation: Vertical Stratification matters', Guido Vettoretti, 13 May 2024
The comment was uploaded in the form of a supplement: https://cp.copernicus.org/preprints/cp-2024-23/cp-2024-23-RC3-supplement.pdf
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AC3: 'Reply on RC3', Yugeng Chen, 13 Jun 2024
The comment was uploaded in the form of a supplement: https://cp.copernicus.org/preprints/cp-2024-23/cp-2024-23-AC3-supplement.pdf
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AC3: 'Reply on RC3', Yugeng Chen, 13 Jun 2024
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