DOI: 10.5194/cp-12-807-2016
Scopus记录号: 2-s2.0-84964267438
论文题名: Model simulations of early westward flow across the Tasman Gateway during the early Eocene
作者: Sijp W.P. ; Von Der Heydt A.S. ; Bijl P.K.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2016
卷: 12, 期: 4 起始页码: 807
结束页码: 817
语种: 英语
Scopus关键词: biogeography
; circumpolar current
; dinoflagellate
; eastern boundary current
; Eocene
; micropaleontology
; paleoceanography
; paleoenvironment
; simulation
; throughflow
; western boundary current
; Australia
; Drake Passage
; Southern Ocean
; Dinophyceae
英文摘要: The timing and role in ocean circulation and climate of the opening of Southern Ocean gateways is as yet elusive. Recent micropalaeontological studies suggest the onset of westward throughflow of surface waters from the SW Pacific into the Australo-Antarctic Gulf through a southern shallow opening of the Tasman Gateway from 49-50 Ma onwards, a direction that is counter to the present-day eastward-flowing Antarctic Circumpolar Current. Here, we present the first model results specific to the early-to-middle Eocene where, in agreement with the field evidence, southerly shallow opening of the Tasman Gateway indeed causes a westward flow across the Tasman Gateway. As a result, modelled estimates of dinoflagellate biogeography are in agreement with the recent findings. Crucially, in this situation where Australia is still situated far south and almost attached to Antarctica, the Drake Passage must be sufficiently restricted to allow the prevailing easterly wind pattern to set up this southerly restricted westward flow. In contrast, an open Drake Passage, up to 517 m deep, leads to an eastward flow, even when the Tasman Gateway and the Australo-Antarctic gulf are entirely contained within the latitudes of easterly wind. © Author(s) 2016. 资助项目: ARC, Australian Research Council
; NWO, Nederlandse Organisatie voor Wetenschappelijk Onderzoek
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49035
Appears in Collections: 气候变化与战略
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Recommended Citation:
Sijp W.P.,Von Der Heydt A.S.,Bijl P.K.. Model simulations of early westward flow across the Tasman Gateway during the early Eocene[J]. Climate of the Past,2016-01-01,12(4)