Preprints
https://doi.org/10.5194/cp-2021-96
https://doi.org/10.5194/cp-2021-96

  24 Aug 2021

24 Aug 2021

Review status: this preprint is currently under review for the journal CP.

Multiple Proxy Estimates of pCO2 in the Hauterivian–Barremian of the Laiyang Basin, Eastern China

Peihong Jin1,2, Mingzheng Zhang1, Xiangtong Lei3, Baoxia Du2,4, Junling Dong5, and Bainian Sun2,3 Peihong Jin et al.
  • 1Key Laboratory of Petroleum Resources, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Gansu Province, Lanzhou 730000, China
  • 2State Key Laboratory of Paleobiology and Stratigraphy, Nanjing Institute of Geology and Paleontology, CAS, Nanjing 210008, China
  • 3Yunnan Key Laboratory for Palaeobiology, Institute of Palaeontology, Yunnan University, Yunnan Province, Kunming 650000, China
  • 4School of Earth Science, Lanzhou University and Key Laboratory of Mineral Resources in Western China (Gansu Province), Lanzhou 730000, China
  • 5State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China

Abstract. In recent decades, several proxies have been developed to reconstruct atmospheric paleo-CO2 concentrations (pCO2). The confidence in paleo-CO2 estimates can be increased by comparing results from multiple proxies with multiple species at a single site. Here we present a new pCO2 record for the Hauterivian–Barremian using three methods based on two fossil coniferous species (Cupressinocladus sp. and Brachyphyllum obtusum) collected from Laiyang Basin, eastern China. The pCO2 values were approximately 579–663 ppmv (recent standardization) and 966–1106 ppmv (carboniferous standardization) based on the stomatal ratio (SR)-based method, and about 472–525 ppmv based on the mechanistic model. Both of these two methods were highly coincident with other SR-based and geochemical reconstructions for the early stage of the Early Cretaceous. The pCO2 value estimated using the carbon isotopes model was approximately 472–525 ppmv, which is generally lower than the pCO2 valueestimated using the other methods. The mechanistic model may be widely applied to more fossil taxa than the SR-based method and retains sensitivity at high pCO2. Furthermore, by comparing with other pCO2 records and Weissert event in the Early Cretaceous, the pCO2 values obtained from this study indicate a relatively low atmospheric CO2 concentration during the Hauterivian–Barremian, and reflect the cooling event in the last stage of the Weissert event.

Peihong Jin et al.

Status: open (extended)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on cp-2021-96', Gregory Retallack, 04 Oct 2021 reply
    • AC1: 'Reply on RC1', peihong jin, 18 Oct 2021 reply

Peihong Jin et al.

Peihong Jin et al.

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Short summary
Atmospheric CO2 is one of the most important greenhouse gases and it is considered the primary driver of climate in millions of years ago. Here we present a new CO2 record for 130 million years ago based on three different proxy methods using plant fossils collected from Laiyang Basin, eastern China. The CO2 value obtained from this study indicates a relatively low atmospheric CO2 concentration and a cool climate during the last stages of the Weissert event.