中新世气候适宜期构造运动加速全球海洋碳循环  

Accelerated marine carbon cycling forced by tectonic degassing over the Miocene Climate Optimum

作　　者：刘丰豪 杜金龙 黄恩清 马文涛 马小林 Lucas J.Lourens 田军 Fenghao Liu;Jinlong Du;Enqing Huang;Wentao Ma;Xiaolin Ma;Lucas J.Lourens;Jun Tian(State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China;State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China;State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710061,China;Department of Earth Sciences,Faculty of Geosciences,Utrecht University,Utrecht CB 3584,Netherlands)

机构地区：[1]State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China [2]State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China [3]State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710061,China [4]Department of Earth Sciences,Faculty of Geosciences,Utrecht University,Utrecht CB 3584,Netherlands

出　　处：《Science Bulletin》2024年第6期823-832,共10页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(42122042,42030403,and 42188102);the Fundamental Research Funds for the Central Universities(22120220531);the Shanghai Pilot Program for Basic Research;the Netherlands Earth System Science Centre(024.002.001)。

摘　　要：Global warming during the Miocene Climate Optimum(MCO,~17-14 million years ago)is associated with massive carbon emissions sourced from the flood basalt volcanism and ocean crustal production.However,the perturbation of tectonic carbon degassing on the interaction between climate change and carbon cycle remains unclear.Here,through time-evolutive phase analysis of new and published high-resolution benthic foraminiferal oxygen(δ^(18)O)and carbon(δ^(13)C)isotope records from the global ocean,we find that variations in the marine carbon cycle lead the climate-cryosphere system(δ^(13)Clead-δ^(18)O)on 405,000-year eccentricity timescales during the MCO.This is in contrast to the previously reported climate-lead-carbon(δ^(18)O-lead-δ^(13)C)scenario during most of the Oligo-Miocene(~34-6 million years ago).Further sensitivity analysis and model simulations suggest that the elevated atmospheric CO_(2) concentrations and the resulting greenhouse effect strengthened the low-latitude hydrological cycle during the MCO,accelerating the response of marine carbon cycle to eccentricity forcing.Tropical climate processes played a more important role in regulating carbon-cycle variations when Earth's climate was in a warm regime,as opposed to the dominant influence of polar ice-sheet dynamics during the PlioPleistocene(after~6 million years ago).

关 键 词：Global warming Eccentricity cycle Carbon cycle Low-latitude hydrological cycle 

分 类 号：P736.22[天文地球—海洋地质] P534.621[天文地球—海洋科学]