CaltechAUTHORS
  A Caltech Library Service

Late Pleistocene glacial advances in the western Tibet interior

Amidon, William H. and Bookhagen, Bodo and Avouac, Jean-Philippe and Smith, Taylor and Rood, Dylan (2013) Late Pleistocene glacial advances in the western Tibet interior. Earth and Planetary Science Letters, 381 . pp. 210-221. ISSN 0012-821X. http://resolver.caltech.edu/CaltechAUTHORS:20131219-075504407

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20131219-075504407

Abstract

It has long been observed that the timing of glacial advances is asynchronous across the Himalaya–Karakoram–Tibet Plateau (HKTP) but the climatic implications, if any, remain unclear. Resolving this question requires additional glacial chronologies from unique spatial and climatic regimes as well as an analysis of how glaciers within different regimes are likely to have responded to past climate changes. This study presents a ^(10)Be–^(21)Ne chronology from the Mawang Kangri range of western Tibet (∼34°N, 80°E); an arid high-elevation site. We identify advances at ∼123, 83, and 56 kyr, which agree reasonably well with sites in the immediate vicinity, but are asynchronous relative to sites across the entire HKTP, and relative to sites in the western HKTP. To evaluate HKTP-wide asynchroneity, we compile dated glacial chronologies and classify them by the approximate timing of their maximum recent advance. This result shows a strong spatial clustering of young (MIS 1–2) relative to older (MIS 3–5) maximum advances. Further comparison with modern precipitation, temperature, and topographic data show that the pattern of HKTP-wide asynchroneity is broadly independent of topography and can potentially be explained by local responses to changes in temperature at either very warm-wet or cold-dry sites. Sites that receive intermediate amounts of precipitation are more ambiguous, although spatial clustering of MIS 1–2 vs. MIS 3–5 advances is suggestive of past variations in precipitation at these sites. In western Tibet, no spatial or climatic correlation is observed with the timing of maximum glacial advances. We suggest this could arise from mis-interpretation of disparate boulder ages generated by a prolonged MIS-3/4 glacial advance in the western HKTP.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.epsl.2013.08.041 DOIArticle
http://www.sciencedirect.com/science/article/pii/S0012821X13004792PublisherArticle
Additional Information:© 2013 Elsevier B.V. Received 28 May 2013; Received in revised form 16 August 2013; Accepted 17 August 2013; Available online 25 September 2013. Editor: T.M. Harrison. Thanks to Jing Liu for help with logistical arrangements, Ken Farley for use of his laboratory, and to Ed Amidon for field assistance. Reviews by Ben Laabs and an anonymous reviewer greatly improved the manuscript. Partial funding was provided by the Caltech Tectonics Observatory.
Group:Caltech Tectonics Observatory, Seismological Laboratory
Funders:
Funding AgencyGrant Number
Caltech Tectonics ObservatoryUNSPECIFIED
Subject Keywords:cosmogenic; 10Be; 21Ne; Tibet; climate; glacier
Record Number:CaltechAUTHORS:20131219-075504407
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20131219-075504407
Official Citation:William H. Amidon, Bodo Bookhagen, Jean-Philippe Avouac, Taylor Smith, Dylan Rood, Late Pleistocene glacial advances in the western Tibet interior, Earth and Planetary Science Letters, Volume 381, 1 November 2013, Pages 210-221, ISSN 0012-821X, http://dx.doi.org/10.1016/j.epsl.2013.08.041. (http://www.sciencedirect.com/science/article/pii/S0012821X13004792)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43076
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:23 Dec 2013 21:09
Last Modified:11 Jun 2015 13:57

Repository Staff Only: item control page