DOI: 10.1016/j.epsl.2021.116767
论文题名: Development of the Leeuwin Current on the northwest shelf of Australia through the Pliocene-Pleistocene period
作者: He Y. ; Wang H. ; Liu Z.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 559 语种: 英语
中文关键词: Indonesian Throughflow
; Leeuwin Current
; northwest shelf of Australia
; Pliocene-Pleistocene
; primary productivity
; temperatures
英文关键词: Atmospheric temperature
; Photosynthesis
; Phytoplankton
; Sea level
; Surface properties
; Atmospheric circulation
; Australian continents
; Indonesian throughflow
; Interglacial periods
; Primary productivity
; Sea surface temperature (SST)
; Surface temperature gradient
; Temperature values
; Surface waters
; atmospheric circulation
; continental shelf
; current velocity
; Pliocene-Pleistocene boundary
; sea surface temperature
; throughflow
; Indian Ocean
; Leeuwin Current
英文摘要: Although the Leeuwin Current (LC) is thought to play a pivotal role in climatic and oceanic systems of the western Australian region, how the LC developed through the Pliocene-Pleistocene period remains elusive. Here we used biomarker records to reconstruct variations of temperatures and primary productivity on the northwest shelf of Australia over the last 6 million years. Since ∼1.2 million years ago (Ma), our sea surface temperature record indicates progressive warming, with temperature values comparable to those in the Indo-Pacific Warm Pool, in contrast with the long-term global cooling trend. The regional surface warming was accompanied by suppressed primary productivity, together indicating prevailing warm, low-salinity, nutrient-deficient surface water, and thus a stronger LC since the Mid-Pleistocene Transition. During 4–1.2 Ma, greater surface temperature gradient between the Indo-Pacific Warm Pool and the northwest shelf of Australia and higher primary productivity seem to suggest a generally weaker LC. Warmer temperatures and lower productivity suggest a plausible existence of the LC during 6–4 Ma, but more work is required to confirm this. Impact of sea level and the Indonesian Throughflow on the LC strength may exist, but did not dominate through the Pliocene-Pleistocene period, considering different variation patterns among them. We propose the stronger LC after ∼1.2 Ma was more likely triggered by enhanced atmospheric circulation. Although the increased LC after ∼1.2 Ma may have potentially brought additional moisture to the Australian continent during the interglacial periods, it has not overturned the long-term drying trend through the Pliocene-Pleistocene period. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165504
Appears in Collections: 气候变化与战略
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作者单位: Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, School of Earth Sciences, Zhejiang University, Hangzhou, 310027, China; State Key Lab of Loess and Quaternary Geology, Institute of Earth Environment, CAS, Xi'an, Shaanxi 710061, China; Department of Earth Sciences, The University of Hong Kong, Hong Kong, Hong Kong
Recommended Citation:
He Y.,Wang H.,Liu Z.. Development of the Leeuwin Current on the northwest shelf of Australia through the Pliocene-Pleistocene period[J]. Earth and Planetary Science Letters,2021-01-01,559