气候变化领域集成服务门户(CCPortal): Glacial differences of Southern Ocean Intermediate Waters in the Central South Pacific

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DOI	10.1016/j.quascirev.2019.01.016
	Glacial differences of Southern Ocean Intermediate Waters in the Central South Pacific
	Tapia R.; Nürnberg D.; Ho S.L.; Lamy F.; Ullermann J.; Gersonde R.; Tiedemann R.
发表日期	2019
ISSN	0277-3791
起始页码	105
结束页码	117
卷号	208
英文摘要	Southern Ocean Intermediate Waters (SOIWs), such as Antarctic Intermediate Water and Subantarctic Mode Water, play a key role in modulating the global climate on glacial-interglacial time scales. They link the Southern Ocean and the tropics via mechanisms such as “oceanic tunneling” that transport climatic signals across latitudes. Despite their importance, the past evolution of the SOIWs in the Central South Pacific is largely unknown. Here we compare paired Mg/Ca-temperature, stable carbon (δ 13 C) and oxygen (δ 18 O) isotope records from surface-dwelling and deep-dwelling planktic foraminifera to infer changes in the water column structure for the last 260 ka in the Central South Pacific (54° S). Our study focuses on the subsurface oceanographic variability controlled by SOIWs, which are subducted at the Subantarctic Front. Our data show that the subsurface ocean in the Central South Pacific was colder and fresher during glacial stages than during the Holocene (0–10 ka BP), suggesting a general glacial enhanced presence of Antarctic Intermediate Water, in agreement with previous studies from the Eastern Equatorial Pacific and the Southeast Pacific. However, the subsurface ocean salinity differs for both glacial stages, with fresher condition during the Last Glacial Maximum (LGM; ∼26.5–19 ka BP) and more saline condition during the Penultimate Glacial Maximum (PGM; ∼155–140 ka BP). The δ 13 C data also show contrasting conditions for both glacial time windows in the upper water column, with a large depletion of 0.37‰ in δ 13 C from the LGM values, suggests a larger contribution of “old” low δ 13 C deep waters at intermediate depths at the study site during the PGM, plausibly due to stronger upwelling in high southern latitudes. The dissimilar scenarios between the LGM and the PGM may have been caused by processes that are analogous to the phase-switch in modern day Southern Annular Mode. © 2019 Elsevier Ltd
英文关键词	Intermediate water masses; Last Glacial Maximum; Mg/Ca; Penultimate Glacial Maximum; Planktic foraminifera; Southern Ocean; Stable isotopes
语种	英语
scopus关键词	Housing; Isotopes; Oceanography; Glacial maxima; Intermediate waters; Last Glacial Maximum; Planktic foraminifera; Southern ocean; Stable isotopes; Glacial geology; Antarctic Intermediate Water; climate signal; glacial-interglacial cycle; glacier dynamics; global climate; intermediate water; Last Glacial Maximum; mode water; planktonic foraminifera; stable isotope; temperature; water column; Pacific Ocean; Pacific Ocean (Equatorial); Pacific Ocean (South); Pacific Ocean (Southeast); Southern Ocean; Foraminifera
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/152000
作者单位	Centro de Estudios Avanzados, Universidad de Playa Ancha, Traslaviña 450, Viña del Mar, Chile; GEOMAR, Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1–3, Kiel, D-24148, Germany; Institute of Oceanography, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan; Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, Bremerhaven, D-27568, Germany
推荐引用方式 GB/T 7714	Tapia R.,Nürnberg D.,Ho S.L.,et al. Glacial differences of Southern Ocean Intermediate Waters in the Central South Pacific[J],2019,208.
APA	Tapia R..,Nürnberg D..,Ho S.L..,Lamy F..,Ullermann J..,...&Tiedemann R..(2019).Glacial differences of Southern Ocean Intermediate Waters in the Central South Pacific.Quaternary Science Reviews,208.
MLA	Tapia R.,et al."Glacial differences of Southern Ocean Intermediate Waters in the Central South Pacific".Quaternary Science Reviews 208(2019).