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Bipolar seesaw of atmospheric CO2 between North Pacific and Southern Ocean at millennial timescales

The interhemispheric relation of deep-water ventilation and surface-ocean productivity may have played a prominent role in past atmospheric CO2 regulation. However, how these processes vary on orbital-millennial timescales remains poorly understood. Here, we present high-resolution proxy data and mo...

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Main Authors: Zhong, Yi (Author) , Liu, Yanguang (Author) , Yu, Jimin (Author) , Sun, Chijun (Author) , Wen, Qin (Author) , Kender, Sev (Author) , Horikawa, Keiji (Author) , Zhang, Xu (Author) , Weber, Michael E. (Author) , Li, Siqi (Author) , Yang, Hu (Author) , Kaboth-Bahr, Stefanie (Author) , Bahr, André (Author) , Song, Zhaoyang (Author) , Swann, George E. A. (Author) , Cao, Wei (Author) , Yang, Sheng (Author) , Liu, Yuxing (Author) , Zhang, Jingyu (Author) , Li, Hai (Author) , Xia, Wenyue (Author) , Liu, Qingsong (Author)
Format: Article (Journal) Editorial
Language:English
Published: 16 July 2025
In: Geophysical research letters
Year: 2025, Volume: 52, Issue: 13, Pages: 1-12
ISSN:1944-8007
DOI:10.1029/2025GL115758
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1029/2025GL115758
Verlag, kostenfrei, Volltext: https://www.webofscience.com/api/gateway?GWVersion=2&SrcAuth=GetFTR&SrcApp=WOS&DestURL=https%3A%2F%2Fct.prod.getft.io%2FY2xhcml2YXRlLHdpbGV5LE1UQXVNVEF5T1M4eU1ESTFaMnd4TVRVM05UZyxOR016T0RFeU1qWXRNRE5tTVMwME5qYzVMVGhrTVRJdE9UQXlPREU1TmpWaFpqbGwsaHR0cHM6Ly9kb2kub3JnLzEwLjEwMjkvMjAyNWdsMTE1NzU4.xc1UgV8yok9yNxkvTKmceHkHBDOQup5HfjaQOqGlls8&DestApp=GetFTR&SrcItemId=WOS:001522794400001&SrcAppSID=EUW1ED0C5Asm3kJSmTWYQMLJItdWM&HMAC=rmLz2cclwunDPLpEc14mm5RmlW0zkta7fcnGxGWDOBo%3D
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Author Notes:Yi Zhong, Yanguang Liu, Jimin Yu, Chijun Sun, Qin Wen, Sev Kender, Keiji Horikawa, Xu Zhang, Michael E. Weber, Siqi Li, Hu Yang, Stefanie Kaboth-Bahr, Andre Bahr, Zhaoyang Song, George E.A. Swann, Wei Cao, Sheng Yang, Yuxing Liu, Jingyu Zhang, Hai Li, Wenyue Xia, and Qingsong Liu

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245 1 0 |a Bipolar seesaw of atmospheric CO2 between North Pacific and Southern Ocean at millennial timescales  |c Yi Zhong, Yanguang Liu, Jimin Yu, Chijun Sun, Qin Wen, Sev Kender, Keiji Horikawa, Xu Zhang, Michael E. Weber, Siqi Li, Hu Yang, Stefanie Kaboth-Bahr, Andre Bahr, Zhaoyang Song, George E.A. Swann, Wei Cao, Sheng Yang, Yuxing Liu, Jingyu Zhang, Hai Li, Wenyue Xia, and Qingsong Liu 
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520 |a The interhemispheric relation of deep-water ventilation and surface-ocean productivity may have played a prominent role in past atmospheric CO2 regulation. However, how these processes vary on orbital-millennial timescales remains poorly understood. Here, we present high-resolution proxy data and model simulations on the variability of biological productivity and deep water circulation for the abyssal northwestern Pacific Ocean spanning 20-60 kyr. We found that enhanced surface productivity increased during Heinrich Stadials (HS) and long term, caused by intensified westerly winds and associated dust fertilization, implying CO2 extraction from the atmosphere and increased nutrient supply to the euphotic zone. A similar increase in productivity for the Southern Ocean during Heinrich events implies enhanced upwelling and exhalation of CO2 to the atmosphere, indicative for an interhemispheric carbon cycle seesaw on millennial time scales. However, the longer-term global cooling demonstrates that deep ocean carbon storage and degassing was predominantly modulated by the North Pacific Ocean. 
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