DOI: 10.1016/j.palaeo.2017.08.023
论文题名: The response of the Bering Sea Gateway during the Mid-Pleistocene Transition
作者: Stroynowski Z. ; Abrantes F. ; Bruno E.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
语种: 英语
英文关键词: Diatoms
; IODP Expedition 323
; North Pacific
; Productivity
; Sea ice
英文摘要: The Mid-Pleistocene transition and the response of sea ice in the subarctic North Pacific are examined using a diatom record from the north eastern Bering Sea slope (IODP core U1344A). High percentages of diatom sea ice species in the assemblage foster the development of groupings specific to differing ice conditions. Thalassiosira antarctica var. borealis emerges as a key diatom species that delineates the development of thick multiannual sea ice and marks a series of advancements from 0.9 to1.2. Ma after which it dominates the assemblage until 0.6. Ma. The decline of Neodenticula seminae, indicative of Alaskan Stream water inflow, is in agreement with neighbouring core U1343E confirming the reduction of Bering Sea circulation after 0.9. Ma. We propose that during the MPT a stepped advancement of sea ice occurs in the Bering Sea as a response to increased moisture delivery to the high latitudes. An extended period of diatom productivity between 0.75 and 0.65. Ma, marks major deglacial conditions towards the end of the MPT by 0.6-0.55. Ma. The work highlights the important role played by sea ice and supports the contention of a colder MPT in the subarctic Pacific. © 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68086
Appears in Collections: 过去全球变化的重建
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作者单位: Marine Geology Div, IPMA (Portuguese Marine and Atmospherics Institute), Rua Alfredo Magalhães Ramalho 6, 1495-006 Lisbon, Portugal; CCMAR (Centro de Ciências do Mar do Algarve), Universidade do Algarve, 8005-139 Faro, Portugal
Recommended Citation:
Stroynowski Z.,Abrantes F.,Bruno E.. The response of the Bering Sea Gateway during the Mid-Pleistocene Transition[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01