气候变化领域集成服务门户(CCPortal): Changes in the high-latitude Southern Hemisphere through the Eocene-Oligocene transition: A model-data comparison

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DOI	10.5194/cp-16-555-2020
	Changes in the high-latitude Southern Hemisphere through the Eocene-Oligocene transition: A model-data comparison
	Kennedy-Asser A.T.; Lunt D.J.; Valdes P.J.; Ladant J.-B.; Frieling J.; Lauretano V.
发表日期	2020
ISSN	18149324
起始页码	555
结束页码	573
卷号	16 期号:2
英文摘要	The global and regional climate changed dramatically with the expansion of the Antarctic Ice Sheet at the Eocene-Oligocene transition (EOT). These large-scale changes are generally linked to declining atmospheric pCO2 levels and/or changes in Southern Ocean gateways such as the Drake Passage around this time. To better understand the Southern Hemisphere regional climatic changes and the impact of glaciation on the Earth's oceans and atmosphere at the EOT, we compiled a database of 10 ocean and 4 landsurface temperature reconstructions from a range of proxy records and compared this with a series of fully coupled, low-resolution climate model simulations from two models (HadCM3BL and FOAM). Regional patterns in the proxy records of temperature show that cooling across the EOT was less at high latitudes and greater at mid-latitudes. While certain climate model simulations show moderate-good performance at recreating the temperature patterns shown in the data before and after the EOT, in general the model simulations do not capture the absolute latitudinal temperature gradient shown by the data, being too cold, particularly at high latitudes. When taking into account the absolute temperature before and after the EOT, as well as the change in temperature across it, simulations with a closed Drake Passage before and after the EOT or with an opening of the Drake Passage across the EOT perform poorly, whereas simulations with a drop in atmospheric pCO2 in combination with ice growth generally perform better. This provides further support for previous research that changes in atmospheric pCO2 are more likely to have been the driver of the EOT climatic changes, as opposed to the opening of the Drake Passage. © Author(s) 2020.
语种	英语
scopus关键词	carbon dioxide; cooling; database; Eocene-Oligocene boundary; glaciation; latitudinal gradient; proxy climate record; regional climate; Southern Hemisphere; temperature gradient; Antarctic Ice Sheet; Antarctica; Drake Passage; Southern Ocean
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146730
作者单位	BRIDGE, School of Geographical Sciences, University of Bristol, Bristol, United Kingdom; Cabot Institute for the Environment, University of Bristol, Bristol, United Kingdom; Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, United States; Marine Palynology and Paleoceanography, Laboratory of Palaeobotany and Palynology, Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Princetonlaan 8a, Utrecht, 3584CB, Netherlands; Organic Geochemistry Unit, School of Chemistry, University of Bristol, Bristol, United Kingdom
推荐引用方式 GB/T 7714	Kennedy-Asser A.T.,Lunt D.J.,Valdes P.J.,et al. Changes in the high-latitude Southern Hemisphere through the Eocene-Oligocene transition: A model-data comparison[J],2020,16(2).
APA	Kennedy-Asser A.T.,Lunt D.J.,Valdes P.J.,Ladant J.-B.,Frieling J.,&Lauretano V..(2020).Changes in the high-latitude Southern Hemisphere through the Eocene-Oligocene transition: A model-data comparison.Climate of the Past,16(2).
MLA	Kennedy-Asser A.T.,et al."Changes in the high-latitude Southern Hemisphere through the Eocene-Oligocene transition: A model-data comparison".Climate of the Past 16.2(2020).