DOI: 10.1016/j.quascirev.2017.02.004
Scopus记录号: 2-s2.0-85013344045
论文题名: Multi-proxy evidence of millennial climate variability from multiple Bahamian speleothems
作者: Arienzo M.M. ; Swart P.K. ; Broad K. ; Clement A.C. ; Pourmand A. ; Kakuk B.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 161 起始页码: 18
结束页码: 29
语种: 英语
Scopus关键词: Atmospheric temperature
; Caves
; Climate change
; Isotopes
; Oceanography
; Surface waters
; Lower temperatures
; Mean annual temperatures
; Millennial climate variabilities
; Multi-proxy evidences
; Northern Hemispheres
; Sea surface temperature (SST)
; Tropical paleoclimate
; Western Atlantic
; Calcite
; aridity
; calcite
; cave
; geochronology
; Heinrich event
; interstadial
; low temperature
; Northern Hemisphere
; paleoclimate
; sea surface temperature
; speleothem
; stalagmite
; Atlantic Ocean
; Atlantic Ocean (North)
; Bahamas
; Bermuda
英文摘要: Northern Hemisphere tropical paleoclimate records support significant changes associated with Dansgaard Oeschger (D/O) events and Heinrich stadials 1 to 6 during the last 64,000 years. However, few absolutely dated terrestrial records from the western Atlantic span the last six Heinrich stadials. Here we present geochemical results from three new stalagmites collected from a cave in the Bahamas which encompass Heinrich stadials 1 to 6. We build on a previous study of the δ13C and δ18O values of the calcite and δ18O value of fluid inclusions from a single stalagmite from the same cave spanning the last three Heinrich stadials. Absolute geochronometry using U-Th equilibrium series demonstrates that the stalagmites formed between 63.8 and 13.8 kyr BP. The δ13C and δ18O values of the calcite show higher values associated with Heinrich stadials 1–6, and lower values during the D/O interstadial events. The Sr/Ca ratios of the calcite are shown to be relatively invariant, while in two of the samples the Mg/Ca ratios track the δ13C values. Increases in the δ18O values across Heinrich stadials 1–6 are interpreted as being driven by lower temperatures. The two deeper occurring stalagmites demonstrate increased Mg/Ca ratios and δ13C values during Heinrich stadials 1 and 2 which are interpreted as a signal of reduced flow rates in the epikarst and increased water/rock interactions as a result of increased aridity which potentially occurred across all six Heinrich stadials. The observed reductions in mean annual temperature and amount of precipitation across Heinrich stadials are proposed to be driven by a reduction in sea surface temperatures in the North Atlantic and an expanded Bermuda High. During D/O interstadials, the Bahamas cave records likely indicate warmer and/or wetter climate; however the isotopic shifts are not as significant as the isotopic excursions associated with Heinrich stadials. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59284
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Marine Geosciences, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Rickenbacker Causeway, Miami, FL, United States; Now at Division of Hydrologic Sciences, Desert Research Institute, Reno, NV, United States; Department of Marine Ecosystems and Society, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Rickenbacker Causeway, Miami, FL, United States; Department of Atmospheric Sciences, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Rickenbacker Causeway, Miami, FL, United States; Bahamas Underground, Marsh Harbor, Bahamas
Recommended Citation:
Arienzo M.M.,Swart P.K.,Broad K.,et al. Multi-proxy evidence of millennial climate variability from multiple Bahamian speleothems[J]. Quaternary Science Reviews,2017-01-01,161