气候变化领域集成服务门户(CCPortal): Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene

CCPortal

DOI	10.5194/cp-16-1451-2020
	Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene
	Orme L.C.; Crosta X.; Miettinen A.; Divine D.V.; Husum K.; Isaksson E.; Wacker L.; Mohan R.; Ther O.; Ikehara M.
发表日期	2020
ISSN	18149324
起始页码	1451
结束页码	1467
卷号	16 期号:4
英文摘要	Centennial- and millennial-scale variability of Southern Ocean temperature over the Holocene is poorly known, due to both short instrumental records and sparsely distributed high-resolution temperature reconstructions, with evidence for past temperature variations in the region coming mainly from ice core records. Here we present a high-resolution (∼ 60 year), diatom-based sea surface temperature (SST) reconstruction from the western Indian sector of the Southern Ocean that spans the interval 14.2 to 1.0 ka (calibrated kiloyears before present). During the late deglaciation, the new SST record shows cool temperatures at 14.2-12.9 ka and gradual warming between 12.9 and 11.6 ka in phase with atmospheric temperature evolution. This supports the evolution of the Southern Ocean SST during the deglaciation being linked with a complex combination of processes and drivers associated with reorganisations of atmospheric and oceanic circulation patterns. Specifically, we suggest that Southern Ocean surface warming coincided, within the dating uncertainties, with the reconstructed slowdown of the Atlantic Meridional Overturning Circulation (AMOC), rising atmospheric CO2 levels, changes in the southern westerly winds and enhanced upwelling. During the Holocene the record shows warm and stable temperatures from 11.6 to 8.7ka followed by a slight cooling and greater variability from 8.7 to 1ka, with a quasi-periodic variability of 200-260 years identified by spectral analysis. We suggest that the increased variability during the mid- to late Holocene reflects the establishment of centennial variability in SST connected with changes in the high-latitude atmospheric circulation and Southern Ocean convection. © Author(s) 2020.
语种	英语
scopus关键词	air temperature; atmospheric circulation; deglaciation; Holocene; late glacial; meridional circulation; sea surface temperature; westerly; Southern Ocean; Bacillariophyta
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146685
作者单位	Norwegian Polar Institute, Tromsø, 9296, Norway; Icarus, Department of Geography, Maynooth University, Maynooth, Ireland; Umr, Epoc, Université de Bordeafux, Bordeaux, 5805, France; Ecosystems and Environment Research Programme, University of Helsinki, Helsinki, Finland; Department of Physics, Eth Zürich, Zurich, 8093, Switzerland; National Centre for Polar and Ocean Research (NCPOR), Ministry of Earth Sciences, Vasco-da-Gama, Goa, 403804, India; Center for Advanced Marine Core Research, Kochi University, Nankoku, 783-8502, Japan
推荐引用方式 GB/T 7714	Orme L.C.,Crosta X.,Miettinen A.,et al. Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene[J],2020,16(4).
APA	Orme L.C..,Crosta X..,Miettinen A..,Divine D.V..,Husum K..,...&Ikehara M..(2020).Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene.Climate of the Past,16(4).
MLA	Orme L.C.,et al."Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene".Climate of the Past 16.4(2020).