古地理学报2026，Vol.28Issue(2)：773-781,9.DOI:10.7605/gdlxb.2026.068
侏罗纪高分辨率大气二氧化碳浓度变化:来自C3植物有机碳同位素的证据
High-resolution Jurassic atmospheric CO2 concentration variations:evidence from C3 plant organic carbon isotopes
摘要
Abstract
The increase in atmospheric carbon dioxide(pCO2)concentration is widely recognized as the primary driver of global warming.Reconstructing pCO2 levels during geological periods is crucial for improving predictions of future climate change.The Jurassic period represents a typical greenhouse climate interval in Earth's history.Previous studies have estimated Jurassic pCO2 concentrations using various approaches,including climate simulations and geological proxies.However,existing reconstructions are characterized by low temporal resolution and significant discrepancies among different proxy records.In this study,we systematically compiled 1808 C3 plant organic carbon isotope data points from the Jurassic period and applied a novel pCO2 proxy-based on C3 terrestrial plant organic carbon isotopes-to reconstruct a high-resolution,continuous record of atmospheric pCO2 variation throughout the period.Our results indicate that pCO2 levels ranged from 407×10-6 to 7540×10-6,which is broadly consistent with prior estimates.Furthermore,pCO2 exhibited an overall decreasing trend punctuated by three distinct intervals of elevated concentrations,occurring in the Early and Late Jurassic.These fluctuations correlate strongly with coeval geological events,supporting the reliability of the reconstruction.Although the reconstructed pCO2 values during the Early Jurassic Toarcian stage are higher than those derived from other proxies-likely due to regional influences on the isotopic composition of terrestrial C3 plants-the dataset still accurately captures the long-term variation trend of pCO2,underscoring its scientific value.关键词
古气候/侏罗纪/C3陆生植物有机碳同位素/全球变暖/pCO2Key words
palaeoclimate/Jurassic/organic carbon isotopes of C3 terrestrial plant/global warming/pCO2分类
天文与地球科学引用本文复制引用
吕大炜,张雨婷,张之辉,王洛静,郭元辰,郑桂波,李泽宽,王冰..侏罗纪高分辨率大气二氧化碳浓度变化:来自C3植物有机碳同位素的证据[J].古地理学报,2026,28(2):773-781,9.基金项目
深地国家科技重大专项项目(编号:2024ZD1001100)和国家自然科学基金项目(编号:41772096)共同资助.[Co-funded by the Na-tional Science and Technology Major Project for Deep Underground(No.2024ZD1001100)and the National Natural Science Foundation of China(No.41772096)] （编号:2024ZD1001100）
