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Early Jurassic climate and atmospheric CO2 concentration in the Sichuan paleobasin, southwestern China
Climate of the Past ( IF 3.8 ) Pub Date : 2020-11-04 , DOI: 10.5194/cp-16-2055-2020 Xianghui Li , Jingyu Wang , Troy Rasbury , Min Zhou , Zhen Wei , Chaokai Zhang
Climate of the Past ( IF 3.8 ) Pub Date : 2020-11-04 , DOI: 10.5194/cp-16-2055-2020 Xianghui Li , Jingyu Wang , Troy Rasbury , Min Zhou , Zhen Wei , Chaokai Zhang
Climatic oscillations have been developed through the (Early)
Jurassic from marine sedimentary archives but remain unclear from
terrestrial records. This work presents investigation of climate-sensitive
sediments and carbon and oxygen isotope analyses of lacustrine and pedogenic
carbonates for the Early Jurassic Ziliujing Formation taken from the Basin in southwestern China. Sedimentary and stable isotope proxies
manifest that an overall secular (semi)arid climate dominated the Sichuan
Basin
during the Early Jurassic, except for the Hettangian. This climate pattern is
similar to the arid climate in the Colorado Plateau region in western North
America but is distinct from the relatively warm and humid climate in northern China
and at high latitudes in the Southern Hemisphere. The estimated atmospheric CO2
concentration (pCO2) from carbon isotopes of pedogenic carbonates shows
a range of 980–2610 ppmv (∼3.5–10 times the pre-industrial
value) with a mean of 1660 ppmv. Three phases of pCO2 (the
Sinemurian 1500–2000 ppmv, the Pliensbachian 1000–1500 ppmv, and the early
Toarcian 1094–2610 ppmv) and two events of pCO2 rapidly falling by
∼1000–1300 ppmv are observed, illustrating the pCO2
perturbation in the Early Jurassic. The perturbation of pCO2 is
compatible with seawater temperature and carbon cycle from the coeval marine
sediments, suggesting a positive feedback of climate to pCO2 through the Early Jurassic.
更新日期:2020-11-04