Comment on "Absence of Cooling in New Zealand and the Adjacent Ocean During the Younger Dryas Chronozone"-Reference-Cited by-同舟云学术

Comment on "Absence of Cooling in New Zealand and the Adjacent Ocean During the Younger Dryas Chronozone"

Published:2008-05-09 Issue:5877 Volume:320 Page:746-746
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Applegate Patrick J.¹²³,Lowell Thomas V.¹²³,Alley Richard B.¹²³

Affiliation:

1. Department of Geosciences, Pennsylvania State University, University Park, PA 16802, USA.

2. Department of Geology, University of Cincinnati, Cincinnati, OH 45221, USA.

3. Department of Geosciences and Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA 16802, USA.

Abstract

Barrows et al . (Reports, 5 October 2007, p. 86) presented cosmogenic exposure dates and data from an ocean sediment core that challenge evidence for glacier advance in New Zealand during the Younger Dryas event. We use modeling of geomorphic processes to argue that their cosmogenic exposure dates are inconclusive.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference15 articles.

1. Absence of Cooling in New Zealand and the Adjacent Ocean During the Younger Dryas Chronozone

2. Barrows et al . ( 1 ) determined each boulder age by taking the weighted mean of the exposure dates from that boulder [see Eq. 4.17 in ( 8 )] weighting the exposure dates by the inverse squares of their measurement errors. They then estimated the age of the moraine using the weighted mean of the boulder ages from their nine oldest boulders this time weighting each boulder age by the inverse square of the standard deviation of the cosmogenic exposure dates from that boulder. They determined the uncertainty of their moraine age estimate from these standard deviations [Eq. 4.19 in ( 8 )]. This uncertainty (240 years) is quite small compared to the range of their dates (∼7800 years).

3. Younger Dryas Age Advance of Franz Josef Glacier in the Southern Alps of New Zealand

4. C. S. M. Turneyet al., Quat. Sci. Rev.26, 3037 (2007).

5. Accuracy of cosmogenic ages for moraines

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