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学科主题: Geochemistry & Geophysics
题名: ENSO related decadal scale climate variability from the Indo-Pacific Warm Pool
作者: Brijker, JM ; Jung, SJA ; Ganssen, GM ; Bickert, T ; Kroon, D
通讯作者: brij@geo.vu.nl
关键词: ENSO ; Holocene ; Indo-Pacific Warm Pool ; oxygen isotopes
刊名: EARTH AND PLANETARY SCIENCE LETTERS
发表日期: 2007-01-01
卷: 253, 期:40545, 页:67-82
收录类别: sci
部门归属: Vrije Univ Amsterdam, Fac Earth & Life Sci, Dept Paleoecol & Geomorphol, NL-1081 HV Amsterdam, Netherlands; Univ Bremen, Fachbereich Geowissensch 5, D-28334 Bremen, Germany
摘要: The El Nino-Southern Oscillation (ENSO) is a climatic phenomenon that affects socio-economical welfare in vast areas in the world. A continuous record of Holocene ENSO related climate variability of the Indo-Pacific Warm pool (IPWP) is constructed on the basis of stable oxygen isotopes in shells of planktic foraminifera from a sediment core in the western Pacific Ocean. At the centennial scale, variations in the stable oxygen isotope signal (delta O-18) are thought be a representation of ENSO variability, although an imprint of local conditions cannot be entirely excluded. The record for the early Holocene (10.3-6 ka BP) shows, in comparison with the mid- to late Holocene, small amplitude variations in the delta O-18 record of up to 0.3 parts per thousand indicating relatively stable and warm sea surface conditions. The mid- to late Holocene (6-2 ka BP) exemplified higher variability in delta O-18 and thus in oceanic IPWP conditions. Climatically, we interpret this change (5.5-4.2 ka BP) as a phenomenon induced by variability in frequency and/or intensity changes of El Nino. In the period 4.2-2 ka BP we identified several periods, centred on 1.9, 2.1, 2.7, 3.3, 3.7 and 4.2 ka BP, with in general heavy 6180 values. During these periods, the IPWP was relocated to a more eastward position, enhancing the susceptibility for El Nino-like conditions at the core site. Over the last 2000 yr precipitation increased in the area as a response to an increase in Asian monsoon strength, resulting in a freshening of the surface waters. This study corroborates previous findings that the present-day ENSO activity started around 5.5 ka BP. (c) 2006 Elsevier B.V. All rights reserved.
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/8455
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Recommended Citation:
Brijker, JM; Jung, SJA; Ganssen, GM; Bickert, T; Kroon, D.ENSO related decadal scale climate variability from the Indo-Pacific Warm Pool,EARTH AND PLANETARY SCIENCE LETTERS,2007,253(40545):67-82
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文件名: ENSO related decadal scale climate variability from the Indo-Pacific Warm Pool.pdf
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