Model-proxy comparison for overshoot phenomenon of Atlantic thermohaline circulation at Bolling-Allerod

The overshoot phenomenon of the Atlantic thermohaline circulation (THC) is a transient climate response to meltwater forcing and could induce intense climate change by increasing the magnitudes of Atlantic THC changes at the end of meltwater discharges. This phenomenon was formally presented with th...

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Bibliographic Details
Published in:Chinese Science Bulletin
Main Authors: Cheng, Jun, Liu, Zhengyu, He, Feng, Otto-Bliesner, Bette, Brady, Esther, Lynch-Stieglitz, Jean
Other Authors: Cheng, J (reprint author), Nanjing Univ Informat Sci & Technol, NIAMS, Polar Climate Syst & Global Change Lab, Nanjing 210044, Jiangsu, Peoples R China., Nanjing Univ Informat Sci & Technol, NIAMS, Polar Climate Syst & Global Change Lab, Nanjing 210044, Jiangsu, Peoples R China., Nanjing Univ Informat Sci & Technol, NIAMS, ESMC, Nanjing 210044, Jiangsu, Peoples R China., Univ Wisconsin, Dept Atmospher & Ocean Sci, Ctr Climat Res, Madison, WI 53706 USA., Peking Univ, LaCOAS, Dept Atmospher & Ocean Sci, Beijing 100871, Peoples R China., Natl Ctr Atmospher Res, Climate & Global Dynam Div, Boulder, CO 80307 USA., Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA.
Format: Journal/Newspaper
Language:English
Published: 科学通报 英文版 2014
Subjects:
Atlantic thermohaline circulation
Overshoot phenomenon
Bolling-Allerod event
Model-proxy comparison
Deep circulation
MERIDIONAL OVERTURNING CIRCULATION
CLIMATE CHANGES
OCEAN
TH-230
PA-231
DEGLACIATION
DRIVEN
North Atlantic
Online Access:https://hdl.handle.net/20.500.11897/207929
https://doi.org/10.1007/s11434-014-0586-x
Description
Summary:The overshoot phenomenon of the Atlantic thermohaline circulation (THC) is a transient climate response to meltwater forcing and could induce intense climate change by increasing the magnitudes of Atlantic THC changes at the end of meltwater discharges. This phenomenon was formally presented with the successfully simulated Bolling-Allerod (BA) event in the first transient simulation of the last deglaciation with fully coupled model NCAR-CCSM3 (TraCE-21K). Currently, not all proxy records of Atlantic THC support the occurrence of the THC overshoot at BA. Commonly used THC proxy from Bermuda Rise (GGC5) does not exhibit THC overshoot at BA but other proxies such as TTR-451 at Eirik Drift do. How to interpret this regional discrepancy of proxy records is a key question for the validation of the Atlantic THC overshoot at BA. Here, we show that the vigor of deep circulation varies regionally during the Atlantic THC overshoot at BA in TraCE-21K simulation, and this regional discrepancy in the simulation is consistent with that in the marine sediment records in North Atlantic. The consistent model-proxy evidence supports the occurrence of Atlantic THC overshoot at BA. Multidisciplinary Sciences SCI(E) 0 ARTICLE chengjun@nuist.edu.cn 33 4510-4515 59

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