DOI: 10.1016/j.palaeo.2015.09.036
论文题名: High dependence of Ordovician ocean surface circulation on atmospheric CO2 levels
作者: Pohl A. ; Nardin E. ; Vandenbroucke T.R.A. ; Donnadieu Y.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 458 起始页码: 39
结束页码: 51
语种: 英语
英文关键词: Biogeography
; Climate modelling
; CO2
; Ocean surface circulation
; Ordovician
英文摘要: Life on Earth radiated dramatically during the Ordovician Period (485–444 Ma) at all taxonomic levels during an evolutionary episode known as the ‘Great Ordovician Biodiversification Event’. Abundant scientific literature has documented the pattern of biodiversification for numerous organism groups. However, fully understanding this event also requires detailed knowledge about the spatial distribution of the organisms. The full potential of the palaeobiodiversity patterns remains under-explored due to the lack of knowledge about past ocean circulation. Surface circulation significantly conditions the dispersal of organisms, in creating preferential ocean migration pathways or, in contrast, by isolating specific regions and thus establishing major physical barriers. These uncertainties persist because neither direct observational data, nor proxy data independent from the fossil record, are available to reconstruct the ocean surface circulation. Here we present new maps of Ordovician ocean surface circulation based on simulations using the general circulation model FOAM. This is a coupled ocean-atmosphere general circulation model and represents a methodological improvement over previously published work. In addition, we use the most up-to-date palaeogeographical reconstructions to increase compatibility with recent palaeontological databases. In providing clear, synthetic maps of ocean surface circulation in addition to raw model outputs, we aim to facilitate data-model comparison, to assist in interpretation of palaeontological datasets, and to promote renewed discussion about Ordovician biogeography. Finally, we investigate the sensitivity of the circulation pattern to the atmospheric CO2 content, which remains poorly constrained in the Ordovician, potentially ranging from more than 15 times the preindustrial atmospheric CO2 level (PAL) to ~ 5 PAL. Maps are systematically constructed for a high (16 PAL), medium (8 PAL) and low (4 PAL) CO2 value. We show that the circulation pattern is much more sensitive to CO2 than previously suggested. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68330
Appears in Collections: 过去全球变化的重建
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作者单位: LSCE, Laboratoire des Sciences du Climat et de l'Environnement, UMR 8212, CNRS-CEA-UVSQ, CEA Saclay, Orme des Merisiers, Gif-sur-Yvette Cedex, France; UMR 5563 Géosciences Environnement Toulouse, Observatoire Midi-Pyrénées, CNRS, Toulouse, France; Department of Geology and Soil Sciences (WE13), Ghent University, Krijgslaan 281/S8, Ghent, Belgium; UMR 8198 Evo-Eco-Paléo, Université de Lille, Sciences et Technologies, Avenue Paul Langevin, bâtiment SN5, Villeneuve d'Ascq Cedex, France
Recommended Citation:
Pohl A.,Nardin E.,Vandenbroucke T.R.A.,et al. High dependence of Ordovician ocean surface circulation on atmospheric CO2 levels[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,458