DOI: 10.1016/j.quascirev.2016.01.023
Scopus记录号: 2-s2.0-84957062539
论文题名: Last Glacial - Holocene climate variability in the Atlantic sector of the Southern Ocean
作者: Xiao W. ; Esper O. ; Gersonde R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 135 起始页码: 115
结束页码: 137
语种: 英语
英文关键词: Diatoms
; Holocene
; Last Glacial Maximum
; Sea ice
; Sea Surface Temperatures
; Southern Ocean
; Termination I
Scopus关键词: Atmospheric temperature
; Carbon dioxide
; Climatology
; Deposition
; Glacial geology
; Oceanography
; Sea ice
; Submarine geophysics
; Surface properties
; Surface waters
; Transport properties
; Diatoms
; Holocenes
; Last Glacial Maximum
; Sea surface temperature (SST)
; Southern ocean
; Ice
; atmospheric circulation
; climate variation
; diatom
; Holocene
; ice shelf
; interglacial
; Last Glacial Maximum
; opal
; sea ice
; sea surface temperature
; sediment core
; Antarctica
; Atlantic Ocean
; Bouvet Island
; Southern Ocean
; Bacillariophyta
英文摘要: The Southern Ocean plays a major role in the glacial/interglacial global carbon cycle. However, there is a substantial lack of information from its Antarctic Zone south of the Polar Front (PF) to understand key climate processes (e.g., sea ice variability, productivity changes, CO2 source region, shifts of the Southern Westerly Wind) active in this region during the glacial/interglacial transition, due to the limited high-resolution sediment records from this area. To close this gap, we investigated high resolution diatom records from a series of sediment cores from the Atlantic and Western Indian sectors of the Southern Ocean between the modern PF and the Winter Sea Ice (WSI) edge. Summer Sea Surface Temperature (SSST) and sea ice information spanning the past 30 thousand years were derived from diatom transfer functions and indicators, which augment comprehensive information on past surface ocean conditions and related ocean and atmospheric circulation, as well as opal deposition. These complementary lines of evidences also provide important environmental boundary conditions for climate simulations understanding the past climate development in the high latitudes Southern Ocean.Our reconstructions show that the Last Glacial (LG) SSSTs south of the modern PF are 1-3 °C colder than modern conditions, WSI expanded to the modern PF. Our data suggests effective carbon export in the Antarctic Zone during the LG. Deglacial two steps of warming support the bipolar seesaw mechanism. Antarctic Zone is an important source region for the CO2 deglacial increase. The warming was more suppressed towards south, due to continuous ice discharge from Antarctica. The SSSTs exceeded modern values during the early Holocene optimum, when WSI extent probably retreated south of its modern position. The southern boundary of maximum opal deposition zone may have shifted to south of 55°S in the Bouvet Island area at this time. The mid-late Holocene cooling with WSI re-expanding to the Bouvet Island area, probably related to enhanced cold-water export by the Weddell Gyre from the developing cavity under the West Antarctic Ice Shelf. The cooling also suggests a northward shift of the Southern Westerly Wind, at least its southern boundary. © 2016 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59672
Appears in Collections: 过去全球变化的重建
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作者单位: Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany; State Key Laboratory of Marine Geology, Tongji University, Shanghai, China
Recommended Citation:
Xiao W.,Esper O.,Gersonde R.. Last Glacial - Holocene climate variability in the Atlantic sector of the Southern Ocean[J]. Quaternary Science Reviews,2016-01-01,135