globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2017.11.012
Scopus记录号: 2-s2.0-85035110777
论文题名:
Ion microprobe δ18O analyses to calibrate slow growth rate speleothem records with regional δ18O records of precipitation
作者: Domínguez-Villar D.; Lojen S.; Krklec K.; Kozdon R.; Edwards R.L.; Cheng H.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 482
起始页码: 367
结束页码: 376
语种: 英语
英文关键词: calibration ; ion microprobe ; paleoclimate ; Postojna ; speleothem ; δ18O
Scopus关键词: Aquifers ; Calibration ; Caves ; Ion microscopes ; Meteorology ; Ion microprobe ; Meteorological data ; Monitoring periods ; Paleoclimate reconstruction ; Paleoclimates ; Postojna ; Slow growth rates ; speleothem ; Ions ; calibration ; growth rate ; ion microprobe ; karst ; oxygen isotope ; paleoclimate ; precipitation (climatology) ; reconstruction ; speleothem ; Postojna Cave ; Slovenia
英文摘要: Paleoclimate reconstructions based on speleothems require a robust interpretation of their proxies. Detailed transfer functions of external signals to the speleothem can be obtained using models supported by monitoring data. However, the transferred signal may not be stationary due to complexity of karst processes. Therefore, robust interpretations require the calibration of speleothem records with instrumental time series lasting no less than a decade. We present the calibration of a speleothem δ18O record from Postojna Cave (Slovenia) with the regional record of δ18O composition of precipitation during the last decades. Using local meteorological data and a regional δ18O record of precipitation, we developed a model that reproduces the cave drip water δ18O signal measured during a two-year period. The model suggests that the average water mixing and transit time in the studied aquifer is 11 months. Additionally, we used an ion microprobe to study the δ18O record of the top 500 μm of a speleothem from the studied cave gallery. According to U–Th dates and 14C analyses, the uppermost section of the speleothem was formed during the last decades. The δ18O record of the top 500 μm of the speleothem has a significant correlation (r2=0.64; p-value <0.001) with the modelled δ18O record of cave drip water. Therefore, we confirm that the top 500 μm of the speleothem grew between the years 1984 and 2003 and that the speleothem accurately recorded the variability of the δ18O values of regional precipitation filtered by the aquifer. We show that the recorded speleothem δ18O signal is not seasonally biased and that the hydrological dynamics described during monitoring period were stationary during recent decades. This research demonstrates that speleothems with growth rates <50 μm/yr can also be used for calibration studies. Additionally, we show that the fit of measured and modelled proxy data can be used to achieve annually resolved chronologies in speleothems that were not actively growing at the time of collection and/or that do not record annual laminae. © 2017 Elsevier B.V.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110107
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

Files in This Item:

There are no files associated with this item.


作者单位: School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom; Department of Environmental Sciences, Jožef Stefan Institute, Jamova 39, Ljubljana, SI-1000, Slovenia; Faculty of Environmental Sciences, University of Nova Gorica, Vipavska 13, Nova Gorica, 5000, Slovenia; Department of Soil Science, Faculty of Agriculture, University of Zagreb, Svetošimunska 25, Zagreb, 10000, Croatia; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, United States; Department of Geoscience, University of Wisconsin-Madison, 1215 West Dayton St., Madison, WI 53706, United States; Department of Earth Sciences, University of Minnesota, Minneapolis, MN 55455, United States; Institute of Global Environmental Changes, Xian Jiaotong University, Xian, 710049, China

Recommended Citation:
Domínguez-Villar D.,Lojen S.,Krklec K.,et al. Ion microprobe δ18O analyses to calibrate slow growth rate speleothem records with regional δ18O records of precipitation[J]. Earth and Planetary Science Letters,2018-01-01,482
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Domínguez-Villar D.]'s Articles
[Lojen S.]'s Articles
[Krklec K.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Domínguez-Villar D.]'s Articles
[Lojen S.]'s Articles
[Krklec K.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Domínguez-Villar D.]‘s Articles
[Lojen S.]‘s Articles
[Krklec K.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.