Coupled atmosphere-ice-ocean dynamics during Heinrich Stadial 2

Our understanding of climate dynamics during millennial-scale events is incomplete, partially due to the lack of their precise phase analyses under various boundary conditions. Here we present nine speleothem oxygen-isotope records from mid-to-low-latitude monsoon regimes with sub-centennial age pre...

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Bibliographic Details
Published in:Nature Communications
Main Authors: Dong, Xiyu, Kathayat, Gayatri, Rasmussen, Sune O., Svensson, Anders, Severinghaus, Jeffrey P., Li, Hanying, Sinha, Ashish, Xu, Yao, Zhang, Haiwei, Shi, Zhengguo, Cai, Yanjun, Pérez-Mejías, Carlos, Baker, Jonathan, Zhao, Jingyao, Spötl, Christoph, Columbu, Andrea, Ning, Youfeng, Stríkis, Nicolás M., Chen, Shitao, Wang, Xianfeng, Gupta, Anil K., Dutt, Som, Zhang, Fan, Cruz, Francisco W., An, Zhisheng, Lawrence Edwards, R., Cheng, Hai
Format: Text
Language:English
Published: Nature Publishing Group UK 2022
Subjects:
Article
Antarctic
Greenland
Antarc*
ice core
Online Access:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9532435/
http://www.ncbi.nlm.nih.gov/pubmed/36195764
https://doi.org/10.1038/s41467-022-33583-4
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Summary:Our understanding of climate dynamics during millennial-scale events is incomplete, partially due to the lack of their precise phase analyses under various boundary conditions. Here we present nine speleothem oxygen-isotope records from mid-to-low-latitude monsoon regimes with sub-centennial age precision and multi-annual resolution, spanning the Heinrich Stadial 2 (HS2) — a millennial-scale event that occurred at the Last Glacial Maximum. Our data suggests that the Greenland and Antarctic ice-core chronologies require +320- and +400-year adjustments, respectively, supported by extant volcanic evidence and radiocarbon ages. Our chronological framework shows a synchronous HS2 onset globally. Our records precisely characterize a centennial-scale abrupt “tropical atmospheric seesaw” superimposed on the conventional “bipolar seesaw” at the beginning of HS2, implying a unique response/feedback from low-latitude hydroclimate. Together with our observation of an early South American monsoon shift at the HS2 termination, we suggest a more active role of low-latitude hydroclimate dynamics underlying millennial events than previously thought.

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