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Effects of Dating Errors on Nonparametric Trend Analyses of Speleothem Time Series : Volume 8, Issue 5 (23/10/2012)

By Mudelsee, M.

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Book Id: WPLBN0004006376
Format Type: PDF Article :
File Size: Pages 12
Reproduction Date: 2015

Title: Effects of Dating Errors on Nonparametric Trend Analyses of Speleothem Time Series : Volume 8, Issue 5 (23/10/2012)  
Author: Mudelsee, M.
Volume: Vol. 8, Issue 5
Language: English
Subject: Science, Climate, Past
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Fohlmeister, J., Scholz, D., & Mudelsee, M. (2012). Effects of Dating Errors on Nonparametric Trend Analyses of Speleothem Time Series : Volume 8, Issue 5 (23/10/2012). Retrieved from http://new.worldlibrary.net/


Description
Description: Climate Risk Analysis, Hannover, Germany. A fundamental problem in paleoclimatology is to take fully into account the various error sources when examining proxy records with quantitative methods of statistical time series analysis. Records from dated climate archives such as speleothems add extra uncertainty from the age determination to the other sources that consist in measurement and proxy errors. This paper examines three stalagmite time series of oxygen isotopic composition (Δ18O) from two caves in western Germany, the series AH-1 from the Atta Cave and the series Bu1 and Bu4 from the Bunker Cave. These records carry regional information about past changes in winter precipitation and temperature. U/Th and radiocarbon dating reveals that they cover the later part of the Holocene, the past 8.6 thousand years (ka). We analyse centennial- to millennial-scale climate trends by means of nonparametric Gasser–Müller kernel regression. Error bands around fitted trend curves are determined by combining (1) block bootstrap resampling to preserve noise properties (shape, autocorrelation) of the Δ18O residuals and (2) timescale simulations (models StalAge and iscam). The timescale error influences on centennial- to millennial-scale trend estimation are not excessively large. We find a mid-Holocene climate double-swing, from warm to cold to warm winter conditions (6.5 ka to 6.0 ka to 5.1 ka), with warm–cold amplitudes of around 0.5‰ Δ18O; this finding is documented by all three records with high confidence. We also quantify the Medieval Warm Period (MWP), the Little Ice Age (LIA) and the current warmth. Our analyses cannot unequivocally support the conclusion that current regional winter climate is warmer than that during the MWP.

Summary
Effects of dating errors on nonparametric trend analyses of speleothem time series

Excerpt
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