Pollen record of climate change during the last deglaciation from the eastern Tibetan Plateau.
The eastern Tibetan Plateau (TP) is a climatically sensitive area affected by the Indian Summer Monsoon (ISM). A new pollen record from a lacustrine sediment in Mao County shows that the study area was covered mainly by shrubs and herbs during the last deglaciation, indicating open and sparse forest...
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ftdoajarticles:oai:doaj.org/article:08de4b963d6b485fbefe6e34a2458ebd 2023-05-15T16:30:01+02:00 Pollen record of climate change during the last deglaciation from the eastern Tibetan Plateau. Wei Shi Hanchao Jiang Xue Mao Hongyan Xu 2020-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0232803 https://doaj.org/article/08de4b963d6b485fbefe6e34a2458ebd EN eng Public Library of Science (PLoS) https://doi.org/10.1371/journal.pone.0232803 https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0232803 https://doaj.org/article/08de4b963d6b485fbefe6e34a2458ebd PLoS ONE, Vol 15, Iss 5, p e0232803 (2020) Medicine R Science Q article 2020 ftdoajarticles https://doi.org/10.1371/journal.pone.0232803 2022-12-31T05:02:43Z The eastern Tibetan Plateau (TP) is a climatically sensitive area affected by the Indian Summer Monsoon (ISM). A new pollen record from a lacustrine sediment in Mao County shows that the study area was covered mainly by shrubs and herbs during the last deglaciation, indicating open and sparse forest grasslands. Hydrophilous herbs were mainly dominated by Cyperaceae, Poaceae, Myriophyllum, Polygonum and Typha, and they gradually increased from 18.7 to 16.8 ka, suggesting a transition to a more humid climate. This corresponds to climate cooling over the same period. From 16.8 to 14.6 ka, hydrophilous herbs continued to increase, coincident with a general ameliorating trend indicated by δ18O records from East Asia. Between 14.6 and 14.0 ka, the mean content of hydrophilous herbs reached peak in the sequence, corresponding to relatively high δ18O values during this period. From ~14.0 to 12.9 ka, the abundance of hydrophilous herbs decreased significantly. Over the same period, the Greenland ice core shows a decrease in δ18O and low-latitude cave stalagmites in China record an increase in δ18O. This implies that longitudinal temperature gradients increased and drove the southward retreat of the ISM, which in turn drove a continuous decrease in the abundance of hydrophilous herbs in the study area. From 12.9 to 11.6 ka, the mean content of hydrophilous herbs decreased to the lowest (8.3%) in the whole sequence, indicating a cold and dry climate in the study area. A positive shift in δ18O records during 11.6-10.6 ka was matched by a significant increase in the abundance of hydrophilous herbs in the study area, indicating a warm and humid climate trending. Hence, the ISM has had a significant impact on the climate of the eastern TP since the onset of deglaciation around ~16.8 ka. Article in Journal/Newspaper Greenland Greenland ice core ice core Directory of Open Access Journals: DOAJ Articles Greenland Indian PLOS ONE 15 5 e0232803 |
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Medicine R Science Q Wei Shi Hanchao Jiang Xue Mao Hongyan Xu Pollen record of climate change during the last deglaciation from the eastern Tibetan Plateau. |
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Medicine R Science Q |
description |
The eastern Tibetan Plateau (TP) is a climatically sensitive area affected by the Indian Summer Monsoon (ISM). A new pollen record from a lacustrine sediment in Mao County shows that the study area was covered mainly by shrubs and herbs during the last deglaciation, indicating open and sparse forest grasslands. Hydrophilous herbs were mainly dominated by Cyperaceae, Poaceae, Myriophyllum, Polygonum and Typha, and they gradually increased from 18.7 to 16.8 ka, suggesting a transition to a more humid climate. This corresponds to climate cooling over the same period. From 16.8 to 14.6 ka, hydrophilous herbs continued to increase, coincident with a general ameliorating trend indicated by δ18O records from East Asia. Between 14.6 and 14.0 ka, the mean content of hydrophilous herbs reached peak in the sequence, corresponding to relatively high δ18O values during this period. From ~14.0 to 12.9 ka, the abundance of hydrophilous herbs decreased significantly. Over the same period, the Greenland ice core shows a decrease in δ18O and low-latitude cave stalagmites in China record an increase in δ18O. This implies that longitudinal temperature gradients increased and drove the southward retreat of the ISM, which in turn drove a continuous decrease in the abundance of hydrophilous herbs in the study area. From 12.9 to 11.6 ka, the mean content of hydrophilous herbs decreased to the lowest (8.3%) in the whole sequence, indicating a cold and dry climate in the study area. A positive shift in δ18O records during 11.6-10.6 ka was matched by a significant increase in the abundance of hydrophilous herbs in the study area, indicating a warm and humid climate trending. Hence, the ISM has had a significant impact on the climate of the eastern TP since the onset of deglaciation around ~16.8 ka. |
format |
Article in Journal/Newspaper |
author |
Wei Shi Hanchao Jiang Xue Mao Hongyan Xu |
author_facet |
Wei Shi Hanchao Jiang Xue Mao Hongyan Xu |
author_sort |
Wei Shi |
title |
Pollen record of climate change during the last deglaciation from the eastern Tibetan Plateau. |
title_short |
Pollen record of climate change during the last deglaciation from the eastern Tibetan Plateau. |
title_full |
Pollen record of climate change during the last deglaciation from the eastern Tibetan Plateau. |
title_fullStr |
Pollen record of climate change during the last deglaciation from the eastern Tibetan Plateau. |
title_full_unstemmed |
Pollen record of climate change during the last deglaciation from the eastern Tibetan Plateau. |
title_sort |
pollen record of climate change during the last deglaciation from the eastern tibetan plateau. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2020 |
url |
https://doi.org/10.1371/journal.pone.0232803 https://doaj.org/article/08de4b963d6b485fbefe6e34a2458ebd |
geographic |
Greenland Indian |
geographic_facet |
Greenland Indian |
genre |
Greenland Greenland ice core ice core |
genre_facet |
Greenland Greenland ice core ice core |
op_source |
PLoS ONE, Vol 15, Iss 5, p e0232803 (2020) |
op_relation |
https://doi.org/10.1371/journal.pone.0232803 https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0232803 https://doaj.org/article/08de4b963d6b485fbefe6e34a2458ebd |
op_doi |
https://doi.org/10.1371/journal.pone.0232803 |
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PLOS ONE |
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15 |
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5 |
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