DOI: 10.1016/j.quascirev.2013.04.014
Scopus记录号: 2-s2.0-84878504735
论文题名: Regional climate variability and ecosystem responses to the last deglaciation in the northern hemisphere from stable isotope data and calcite fabrics in two northern Adriatic stalagmites
作者: Belli R. ; Frisia S. ; Borsato A. ; Drysdale R. ; Hellstrom J. ; Zhao J.-X. ; Spötl C.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 72 起始页码: 146
结束页码: 158
语种: 英语
英文关键词: Calcite fabric
; Early Holocene
; Lamina thickness
; Speleothems
; Stable isotopes
; Younger Dryas
Scopus关键词: Early Holocene
; Lamina thickness
; Speleothems
; Stable isotopes
; Younger Dryas
; Aquifers
; Calcite
; Caves
; Climate change
; Complex networks
; Geochemistry
; Glacial geology
; Hydrology
; Isotopes
; calcite
; carbon isotope
; climate variation
; deglaciation
; ecosystem response
; geochemical method
; Holocene
; infiltration
; karst
; Northern Hemisphere
; oxygen isotope
; paleoclimate
; petrography
; regional climate
; speleothem
; stable isotope
; stalagmite
; time series
; Younger Dryas
; Italy
英文摘要: Geochemical and physical changes along the growth axis of speleothems are controlled by climate as well as the dynamics of the host karst system. Discriminating between the two is one of the major challenges in assembling robust cave palaeoclimate records. Overcoming this dilemma may be achieved by investigating multiple properties from two or more speleothems from the same cave, spanning the same time interval. In this study, we use high-resolution stable oxygen and carbon isotope (δ13C and δ18O), morphological and petrographic data from two calcite stalagmites (SV1 and SV7) from Grotta Savi, Italy, to help constraining the regional climate conditions during the Younger Dryas. The new SV1 record, spanning 15.3-9.4ka, builds on a previously published low-resolution stable isotope time series. It is anchored by 22 new U-Th ages and lamina-counting, yielding a refined age model that supersedes the previous one. The SV7 record is anchored by 8 U-Th ages and spans 13.1-10.5ka, partially overlapping the SV1 record. Together, the morphological and geochemical characteristics of SV1 and SV7 allow us to identify site-specific processes driving the isotopic variations. This enables us to explore the degree of complacency in speleothems whereby, periodically, a speleothem is insensitive to recording a climate signal, due to aquifer hydrology and network evolution. The model suggests that δ18O is a proxy for the infiltration amount that reaches the site of deposition, which, in the case of SV7, was buffered by the aquifer hydrology. The interpretation of δ13C in both stalagmites is more complex, being influenced by both temperature and hydrology. Only a comparison of the two stalagmite records allows us to recognise a decoupling between the effects of hydrology and temperature. According to our interpretation, the most distinctive climate information of the Younger Dryas was the high hydrological variability, with phases dominated by seasonal infiltration within an overall cooling trend. Our record also reveals a significant Early Holocene climate anomaly - centred at 10.4ka - whose magnitude was possibly amplified by local synoptic conditions. Our research demonstrates the importance of investigating several complementary proxies, particularly from morphologically diverse stalagmites. When monitoring data are not available, fabric and lamina thickness can be fundamental to unravelling the dominant control of hydrology or temperature on stable isotopes. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60597
Appears in Collections: 过去全球变化的重建
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作者单位: School of Environmental and Life Science, The University of Newcastle, Callaghan, NSW 2308, Australia; Department of Resource Management and Geography, The University of Melbourne, Parkville, VIC 3010, Australia; School of Earth Sciences, The University of Melbourne, Parkville, VIC 3010, Australia; The University of Queensland, Brisbane, QLD 4072, Australia; Institute of Geology and Paleontology, The University of Innsbruck, 6020 Innsbruck, Austria
Recommended Citation:
Belli R.,Frisia S.,Borsato A.,et al. Regional climate variability and ecosystem responses to the last deglaciation in the northern hemisphere from stable isotope data and calcite fabrics in two northern Adriatic stalagmites[J]. Quaternary Science Reviews,2013-01-01,72