Middle Cretaceous pCO_2 Variation in Yumen, Gansu Province and its Response to the Climate Events

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Middle Cretaceous pCO_2 Variation in Yumen, Gansu Province and its Response to the Climate Events

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英文篇名：Middle Cretaceous pCO_2 Variation in Yumen, Gansu Province and its Response to the Climate Events
作者：LEI ; Xiangtong ; DU ; Zhen ; DU ; Baoxia ; ZHANG ; Mingzhen ; SUN ; Bainian
英文作者：LEI Xiangtong;DU Zhen;DU Baoxia;ZHANG Mingzhen;SUN Bainian;School of Earth Sciences & Key Laboratory of Mineral Resources in Western China (Gansu Province), Lanzhou University;State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences;Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences;
英文关键词：pCO_2;;greenhouse climate;;plant photosynthetic gas exchange mechanical model;;OAE1b;;Cold snap
中文刊名：DZXW
英文刊名：地质学报(英文版)
机构：School of Earth Sciences & Key Laboratory of Mineral Resources in Western China (Gansu Province), Lanzhou University;State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences;Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences;
出版日期：2018-04-15
出版单位：Acta Geologica Sinica(English Edition)
年：2018
期：v.92
基金：the National Natural Science Foundation of China(No.41402007,41602023,40972025);; the State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,CAS(No.153102)
语种：英文;
页：DZXW201802024
页数：13
CN：02
ISSN：11-2001/P
分类号：381-393

摘要

The palaeo-atmospheric CO_2 concentration(pCO_2) variation in the Yumen, Gansu Province during the middle Cretaceous has been reconstructed using the newly established plant photosynthetic gas exchange mechanistic model, and the results show that the p CO_2 values are in the range of about 550–808 ppmv. The present pCO_2 values are higher than the p CO2 results(531–641 ppmv) of the previous study according to the Recent standardization of the stomatal ratio method, and much lower than the pCO_2 results(882–1060 ppmv) according to the Carboniferous standardization of the stomatal ratio method. The present pCO_2 variation is not only within the error range of GEOCARBⅡ and GEOCARB Ⅲ but also is similar to the reconstructed results based on the biochemistry and carbon isotope models. Besides, the present Brachyphyllum specimens were collected from four consecutive horizons of the upper Zhonggou Formation of the Hanxia Section, and the reconstructed pCO_2 exhibits the reconstructed pCO_2 exhibits a decline trend during the late Aptian to early Albian. This decline variation is probably associated with the Oceanic Anoxic Events(OAE1 b) and the Cold snap event. With the combination of p CO_2 during the Albian to Cenomanian recovered by the plant photosynthetic gas exchange mechanistic model, the pCO_2 showed a prominent increase during the late Aptian to early Cenominian, which indicates a response to the greenhouse warming during the middle Cretaceous. Therefore, the mechanical model of the plant photosynthetic gas exchange shows a relatively strong accuracy in the reconstruction of the pCO_2 and can reflect a strong relation between the atmospheric CO_2 concentrations and climatic events.
The palaeo-atmospheric CO_2 concentration(pCO_2) variation in the Yumen, Gansu Province during the middle Cretaceous has been reconstructed using the newly established plant photosynthetic gas exchange mechanistic model, and the results show that the p CO_2 values are in the range of about 550–808 ppmv. The present pCO_2 values are higher than the p CO2 results(531–641 ppmv) of the previous study according to the Recent standardization of the stomatal ratio method, and much lower than the pCO_2 results(882–1060 ppmv) according to the Carboniferous standardization of the stomatal ratio method. The present pCO_2 variation is not only within the error range of GEOCARBⅡ and GEOCARB Ⅲ but also is similar to the reconstructed results based on the biochemistry and carbon isotope models. Besides, the present Brachyphyllum specimens were collected from four consecutive horizons of the upper Zhonggou Formation of the Hanxia Section, and the reconstructed pCO_2 exhibits the reconstructed pCO_2 exhibits a decline trend during the late Aptian to early Albian. This decline variation is probably associated with the Oceanic Anoxic Events(OAE1 b) and the Cold snap event. With the combination of p CO_2 during the Albian to Cenomanian recovered by the plant photosynthetic gas exchange mechanistic model, the pCO_2 showed a prominent increase during the late Aptian to early Cenominian, which indicates a response to the greenhouse warming during the middle Cretaceous. Therefore, the mechanical model of the plant photosynthetic gas exchange shows a relatively strong accuracy in the reconstruction of the pCO_2 and can reflect a strong relation between the atmospheric CO_2 concentrations and climatic events.

引文

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