The limited influence of glaciations in Tibet on global climate over the past 170 000 yr
Extensive ice cover on the Tibetan Plateau would significantly influence Earth's climate in general and the Asian monsoon system in particular, but extent and timing of Quaternary glaciations in Tibet remain highly controversial. We dated erratics on top of moraines in the climatic key areas of...
Published in: | Earth and Planetary Science Letters |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
ELSEVIER SCIENCE BV
2002
|
Subjects: | |
Online Access: | http://ir.ieecas.cn/handle/361006/11869 https://doi.org/10.1016/S0012-821X(01)00573-8 |
id |
ftchinacascieeca:oai:ir.ieecas.cn:361006/11869 |
---|---|
record_format |
openpolar |
spelling |
ftchinacascieeca:oai:ir.ieecas.cn:361006/11869 2023-06-11T04:12:52+02:00 The limited influence of glaciations in Tibet on global climate over the past 170 000 yr Schafer, JM Tschudi, S Zhao, ZZ Wu, XH Ivy-Ochs, S Wieler, R Baur, H Kubik, PW Schluchter, C 2002-01-15 http://ir.ieecas.cn/handle/361006/11869 https://doi.org/10.1016/S0012-821X(01)00573-8 英语 eng ELSEVIER SCIENCE BV EARTH AND PLANETARY SCIENCE LETTERS http://ir.ieecas.cn/handle/361006/11869 doi:10.1016/S0012-821X(01)00573-8 null Xizang China exposure age monsoons paleoclimatology glaciation Geochemistry & Geophysics EAST-ASIAN MONSOON PRODUCTION-RATES COSMOGENIC NUCLIDES LAST GLACIATION ICE-SHEET NEON SURFACES PAKISTAN STAGE-2 PLATEAU Article 期刊论文 2002 ftchinacascieeca https://doi.org/10.1016/S0012-821X(01)00573-8 2023-05-08T13:23:58Z Extensive ice cover on the Tibetan Plateau would significantly influence Earth's climate in general and the Asian monsoon system in particular, but extent and timing of Quaternary glaciations in Tibet remain highly controversial. We dated erratics on top of moraines in the climatic key areas of Central and East Tibet using cosmogenic Be-10, Al-26, and Ne-21. Consistent exposure ages obtained by various nuclides indicate a continuous period of exposure since the deposition of the samples. Our data imply that glacial advances were restricted to a few 10 km during the last 170 kyr in Central Tibet and during the peak of the last glaciation (similar to24-13 kyr ago) in Eastern Tibet. Advances of Tibetan glaciers were much less prominent than elsewhere in the northern hemisphere most likely due to very and conditions and high sublimation rates. A proposed ice-dome covering the entire Plateau can be excluded. Thus, albedo increase of Tibet most likely did trigger neither northern hemisphere ice ages nor paleomonsoon changes during the last two glacial cycles. The glacial advance during Marine Isotope Stage 2 in East Tibet and the absence of significant glacial events during the Holocene suggest a relation of snowline lowering in East Tibet to North Atlantic cooling events rather than to periods of high precipitation by an intensified monsoon. (C) 2002 Elsevier Science B.V. All rights reserved. Article in Journal/Newspaper Ice Sheet North Atlantic Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) Earth and Planetary Science Letters 194 3-4 287 297 |
institution |
Open Polar |
collection |
Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchinacascieeca |
language |
English |
topic |
Xizang China exposure age monsoons paleoclimatology glaciation Geochemistry & Geophysics EAST-ASIAN MONSOON PRODUCTION-RATES COSMOGENIC NUCLIDES LAST GLACIATION ICE-SHEET NEON SURFACES PAKISTAN STAGE-2 PLATEAU |
spellingShingle |
Xizang China exposure age monsoons paleoclimatology glaciation Geochemistry & Geophysics EAST-ASIAN MONSOON PRODUCTION-RATES COSMOGENIC NUCLIDES LAST GLACIATION ICE-SHEET NEON SURFACES PAKISTAN STAGE-2 PLATEAU Schafer, JM Tschudi, S Zhao, ZZ Wu, XH Ivy-Ochs, S Wieler, R Baur, H Kubik, PW Schluchter, C The limited influence of glaciations in Tibet on global climate over the past 170 000 yr |
topic_facet |
Xizang China exposure age monsoons paleoclimatology glaciation Geochemistry & Geophysics EAST-ASIAN MONSOON PRODUCTION-RATES COSMOGENIC NUCLIDES LAST GLACIATION ICE-SHEET NEON SURFACES PAKISTAN STAGE-2 PLATEAU |
description |
Extensive ice cover on the Tibetan Plateau would significantly influence Earth's climate in general and the Asian monsoon system in particular, but extent and timing of Quaternary glaciations in Tibet remain highly controversial. We dated erratics on top of moraines in the climatic key areas of Central and East Tibet using cosmogenic Be-10, Al-26, and Ne-21. Consistent exposure ages obtained by various nuclides indicate a continuous period of exposure since the deposition of the samples. Our data imply that glacial advances were restricted to a few 10 km during the last 170 kyr in Central Tibet and during the peak of the last glaciation (similar to24-13 kyr ago) in Eastern Tibet. Advances of Tibetan glaciers were much less prominent than elsewhere in the northern hemisphere most likely due to very and conditions and high sublimation rates. A proposed ice-dome covering the entire Plateau can be excluded. Thus, albedo increase of Tibet most likely did trigger neither northern hemisphere ice ages nor paleomonsoon changes during the last two glacial cycles. The glacial advance during Marine Isotope Stage 2 in East Tibet and the absence of significant glacial events during the Holocene suggest a relation of snowline lowering in East Tibet to North Atlantic cooling events rather than to periods of high precipitation by an intensified monsoon. (C) 2002 Elsevier Science B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Schafer, JM Tschudi, S Zhao, ZZ Wu, XH Ivy-Ochs, S Wieler, R Baur, H Kubik, PW Schluchter, C |
author_facet |
Schafer, JM Tschudi, S Zhao, ZZ Wu, XH Ivy-Ochs, S Wieler, R Baur, H Kubik, PW Schluchter, C |
author_sort |
Schafer, JM |
title |
The limited influence of glaciations in Tibet on global climate over the past 170 000 yr |
title_short |
The limited influence of glaciations in Tibet on global climate over the past 170 000 yr |
title_full |
The limited influence of glaciations in Tibet on global climate over the past 170 000 yr |
title_fullStr |
The limited influence of glaciations in Tibet on global climate over the past 170 000 yr |
title_full_unstemmed |
The limited influence of glaciations in Tibet on global climate over the past 170 000 yr |
title_sort |
limited influence of glaciations in tibet on global climate over the past 170 000 yr |
publisher |
ELSEVIER SCIENCE BV |
publishDate |
2002 |
url |
http://ir.ieecas.cn/handle/361006/11869 https://doi.org/10.1016/S0012-821X(01)00573-8 |
genre |
Ice Sheet North Atlantic |
genre_facet |
Ice Sheet North Atlantic |
op_relation |
EARTH AND PLANETARY SCIENCE LETTERS http://ir.ieecas.cn/handle/361006/11869 doi:10.1016/S0012-821X(01)00573-8 |
op_rights |
null |
op_doi |
https://doi.org/10.1016/S0012-821X(01)00573-8 |
container_title |
Earth and Planetary Science Letters |
container_volume |
194 |
container_issue |
3-4 |
container_start_page |
287 |
op_container_end_page |
297 |
_version_ |
1768388991971753984 |