| DOI: | 10.1016/j.quascirev.2013.02.024
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| Scopus记录号: | 2-s2.0-84877328337
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| 论文题名: | Mid-Holocene climate in New Caledonia (southwest Pacific): Coral and PMIP models monthly resolved results |
| 作者: | Lazareth C.E.; Bustamante Rosell M.G.; Turcq B.; Le Cornec F.; Mandeng-Yogo M.; Caquineau S.; Cabioch G.
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| 刊名: | Quaternary Science Reviews
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| ISSN: | 2773791
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| 出版年: | 2013
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| 卷: | 69 | | 起始页码: | 83
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| 结束页码: | 97
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| 语种: | 英语
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| 英文关键词: | Coral
; Diagenesis
; Geochemistry
; Mid-Holocene
; Seasonal amplitude
; SST
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| Scopus关键词: | Coral
; Diagenesis
; Mid-Holocene
; Seasonal amplitudes
; SST
; Atmospheric temperature
; Computer simulation
; Geochemistry
; Isotopes
; Salinity measurement
; Sedimentology
; Surface waters
; Climate models
; climate modeling
; climate variation
; coral
; diagenesis
; geochemistry
; Holocene
; insolation
; intertropical convergence zone
; La Nina
; paleoceanography
; paleoclimate
; proxy climate record
; rainfall
; sea surface salinity
; sea surface temperature
; seasonality
; Southern Hemisphere
; stable isotope
; New Caledonia [Melanesia]
; Pacific Ocean
; Pacific Ocean (Southwest)
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| 英文摘要: | The mid-Holocene climate is characterized by an insolation seasonality decrease in the Southern Hemisphere but measurements of its actual impact on monthly resolved sea surface temperature (SST) in the southwest Pacific region are still insufficient. A New Caledonian 5.5ka cal BP coral provides a 20-year-long seasonally-resolved record of ocean surface conditions as inferred from coral Sr/Ca and Ba/Ca. Results were compared to monthly series of Paleoclimate Modeling Intercomparison Project phase 2 (PMIP2) model simulations. Anomalous stable isotope and U/Ca values are observed in a restricted area of the skeleton related to dissolution features. The mid-Holocene SST seasonal amplitude mean and variability are higher than presently in New Caledonia, the increased seasonal amplitude in the mid-Holocene being most probably due to the occurrence of colder winters. Other southwest Pacific mid-Holocene coral data showed also such an increased seasonal amplitude. This could mean that the South Pacific Convergence Zone (SPCZ) was weaker or reached locations more northerly than at present, which could fit with northward shifts of the inter-tropical convergence zone (ITCZ) during South Hemisphere winter. Inversely, strong rainfalls during the summer, deduced from the Ba/Ca signal and reconstructed sea surface salinity (SSS), were interpreted as reflecting pronounced southwestward shifts of the SPCZ in summer, as those occurring today during La Niña events. None of the six PMIP2 models used reproduce the proxy-based mid-Holocene increase of SST seasonal amplitude. Model maps show a less intense SPCZ in winter that would be consistent with higher SST seasonal amplitude. Finally, we stress the need for more seasonally-resolved data to validate this enhanced mid-Holocene SST seasonal amplitude in the southwest Pacific region and to better understand the underlying mechanisms. © 2013 Elsevier Ltd. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/60639
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| Appears in Collections: | 过去全球变化的重建
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作者单位: | IPSL/LOCEAN, UPMC/CNRS/IRD/MNHN, Centre IRD France Nord, 32 Avenue Henri Varagnat, 93143 Bondy Cedex, France
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| Recommended Citation: | |
Lazareth C.E.,Bustamante Rosell M.G.,Turcq B.,et al. Mid-Holocene climate in New Caledonia (southwest Pacific): Coral and PMIP models monthly resolved results[J]. Quaternary Science Reviews,2013-01-01,69
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