globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.02.013
Scopus记录号: 2-s2.0-85013218323
论文题名:
Unexpected weak seasonal climate in the western Mediterranean region during MIS 31, a high-insolation forced interglacial
作者: Oliveira D.; Sánchez Goñi M.F.; Naughton F.; Polanco-Martínez J.M.; Jimenez-Espejo F.J.; Grimalt J.O.; Martrat B.; Voelker A.H.L.; Trigo R.; Hodell D.; Abrantes F.; Desprat S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 161
起始页码: 1
结束页码: 17
语种: 英语
英文关键词: Early Pleistocene ; Iberian margin ; Land-sea comparison ; Marine Isotope Stage (MIS) 31 ; Mediterranean vegetation ; Millennial-scale climate variability ; Obliquity and precession forcing ; Pollen analysis ; Precession harmonics ; Super interglacial
Scopus关键词: Forestry ; Glacial geology ; Global warming ; Incident solar radiation ; Isotopes ; Solar radiation ; Time series analysis ; Vegetation ; Climate variability ; Early pleistocene ; Iberian margin ; Marine isotope stages ; Mediterranean vegetation ; Obliquity and precession forcing ; Pollen analysis ; Precession harmonics ; Super interglacial ; Oceanography ; biomarker ; climate variation ; cyclicity ; harmonic analysis ; insolation ; interglacial ; land-sea interaction ; marine isotope stage ; meridional circulation ; obliquity ; orbital forcing ; palynology ; Pleistocene ; precession ; precipitation (climatology) ; sea surface temperature ; seasonal variation ; temperate forest ; temperature profile ; vegetation cover ; Atlantic Ocean ; Atlantic Ocean ; Iberian Margin ; Mediterranean Region
英文摘要: Marine Isotope Stage 31 (MIS 31) is an important analogue for ongoing and projected global warming, yet key questions remain about the regional signature of its extreme orbital forcing and intra-interglacial variability. Based on a new direct land-sea comparison in SW Iberian margin IODP Site U1385 we examine the climatic variability between 1100 and 1050 ka including the “super interglacial” MIS 31, a period dominated by the 41-ky obliquity periodicity. Pollen and biomarker analyses at centennial-scale-resolution provide new insights into the regional vegetation, precipitation regime and atmospheric and oceanic temperature variability on orbital and suborbital timescales. Our study reveals that atmospheric and SST warmth during MIS 31 was not exceptional in this region highly sensitive to precession. Unexpectedly, this warm stage stands out as a prolonged interval of a temperate and humid climate regime with reduced seasonality, despite the high insolation (precession minima values) forcing. We find that the dominant forcing on the long-term temperate forest development was obliquity, which may have induced a decrease in summer dryness and associated reduction in seasonal precipitation contrast. Moreover, this study provides the first evidence for persistent atmospheric millennial-scale variability during this interval with multiple forest decline events reflecting repeated cooling and drying episodes in SW Iberia. Our direct land-sea comparison shows that the expression of the suborbital cooling events on SW Iberian ecosystems is modulated by the predominance of high or low-latitude forcing depending on the glacial/interglacial baseline climate states. Severe dryness and air-sea cooling is detected under the larger ice volume during glacial MIS 32 and MIS 30. The extreme episodes, which in their climatic imprint are similar to the Heinrich events, are likely related to northern latitude ice-sheet instability and a disruption of the Atlantic Meridional Overturning Circulation (AMOC). In contrast, forest declines during MIS 31 are associated to neither SST cooling nor high-latitude freshwater forcing. Time-series analysis reveals a dominant cyclicity of about 6 ky in the temperate forest record, which points to a potential link with the fourth harmonic of precession and thus low-latitude insolation forcing. © 2017
资助项目: Financial support was provided by WarmClim, a LEFE-INSU IMAGO project, and the Portuguese Foundation for Science and Technology (FCT) through the project CLIMHOL (PTDC/AAC-CLI/100157/2008), D. Oliveira's doctoral grant (SFRH/BD/9079/2012), F. Naughton's postdoctoral grant (SFRH/BPD/108712/2015) and A. Voelker's IF contract. JM. Polanco-Martínez was funded by a Basque Government post-doctoral fellowship (Ref. No. POS_2015_1_0006) and B. Martrat by a Ramón y Cajal contract (RYC-2013-14073). This research used samples provided by the Integrated Ocean Drilling Program (IODP), Expedition 339. We would like to thank the scientists and technicians of IODP Expedition 339 and the Bremen Core Repository, L. Devaux for technical assistance and A. Rebotim for comments and editing. The editor, José Carrión, and an anonymous reviewer are acknowledged for their constructive and insightful comments.
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被引频次[WOS]:21   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59280
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作者单位: EPHE, PSL Research University, Laboratoire Paléoclimatologie et Paléoenvironnements Marins, Pessac, France; Univ. Bordeaux, EPOC, UMR 5805, Pessac, France; Divisão de Geologia e Georecursos Marinhos, Instituto Português do Mar e da Atmosfera (IPMA), Avenida de Brasília 6, Lisboa, Portugal; CCMAR, Centro de Ciências do Mar, Universidade do Algarve, Campus de Gambelas, Faro, Portugal; Basque Centre for Climate Change – BC3, Edificio Sede No. 1, 1a, Parque Científico de la UPV/EHU, Leioa, Spain; Department of Biogeochemistry, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima, Yokosuka, Japan; Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research (IDAEA), Spanish Council for Scientific Research (CSIC), Barcelona, Spain; Instituto Dom Luiz, Universidade de Lisboa, Lisboa, Portugal; Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, United Kingdom

Recommended Citation:
Oliveira D.,Sánchez Goñi M.F.,Naughton F.,et al. Unexpected weak seasonal climate in the western Mediterranean region during MIS 31, a high-insolation forced interglacial[J]. Quaternary Science Reviews,2017-01-01,161
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