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Large shift of the Pacific Walker Circulation across the cenozoic

National Science Review 2021年第5期8卷 48-56页

作者： Qing Yan Robert Korty Zhongshi Zhang Chris Brierley Xiangyu Li Huijun Wang Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of Sciences Key Laboratory of Meteorological Disaster Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNanjing University of Information Science and Technology Department of Atmospheric Sciences Texas A&M UniversityCollege Station Department of Atmospheric Science School of Environmental StudiesChina University of Geosciences NORCE Research Climate Bjerknes Center for Climate Research Department of Geography University College London Climate Change Research Center Chinese Academy of Sciences

Fluctuations in the Pacific Walker Circulation(PWC), a zonally oriented overturning cell across the tropical Pacific, can cause widespread climatic and biogeochemical perturbations. It remains unknown how the PWC developed during the cenozoic era, with its substantial changes in greenhouse gases and continental positions. Through a suite of coupled model simulations on tectonic timescales, we demonstrate that the PWC was ～38?broader and ～5% more intense during the Early Eocene relative to present. As the climate cooled from the Early Eocene to the Late Miocene, the width of the PWC shrank, accompanied by an increase in intensity that was tied to the enhanced Pacific zonal temperature gradient. However, the locations of the western and eastern branches behave differently from the Early Eocene to the Late Miocene,with the western edge remaining steady with time due to the relatively stable geography of the western tropical Pacific; the eastern edge migrates westward with time as the South American continent moves northwest. A transition occurs in the PWC between the Late Miocene and Late Pliocene, manifested by an eastward shift(both the western and eastern edges migrate eastward by >12?) and weakening(by ～22%),which we show here is linked with the closure of the tropical seaways. Moreover, our results suggest that rising CO2favors a weaker PWC under the same land-sea configurations, a robust feature across the large spread of cenozoic climates considered here, supporting a weakening of the PWC in a warmer future.

关键词： Pacific Walker Circulation cenozoic era paleoclimate modeling

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Petrochemical Characteristics of the Mesozoic-cenozoic Volcanic Rock in Huanghua Basin

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Journal of Central South University 2000年第2期12卷 75-80页

作者： GU Li 1,DAI Ta gen 1,DENG Cai hua 1,FAN Wei ming 2 (1 College of Resources, Environment and Civil Engineering, Central South University of Technology, Changsha 410083, China 2 Changsha Institute of Geotectonics, Academia Sinica, Changsha 410 College of Resources Environment and Civil Engineering Central South University of Technology Changsha China Changsha Institute of Geotectonics Academia Sinica Changsha China

Based on the data from typical core sampling, combined with K Ar dating, petrochemistry ,trace elemental geochemistry and isotopic compositions of the Mesozoic cenozoic volcanic rock in the Huanghua basin, Bohai region, the geochemical features of the volcanic rock were studied. The rocks fall into four groups: cenozoic basalt,Mesozoic late Cretaceous basaltic trachy andesite, Mesozoic late Cretaceous trachy dacite and liparite,and Mesozoic early Triassic dacite. The distribution pattern of the main elemental abundance of late Mesozoic shows a typical ***,for the volcanic rock,the amount of SiO 2 decreases gradually,the contents of Fe 2O 3,FeO,CaO,MgO,TiO 2,P 2O 5 and MnO increase little by *** cenozoic basalt is derived from the asthenospheric *** late Cretaceous basaltic trachy andesite is derived from the enriched lithospheric *** late Cretaceous and early Palaeogene,the felsic volcanic rock may be derived from fractional melting of the crust.

关键词： Mesozoic cenozoic era volcanism petrochemistry Huanghua basin

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