Climate instability during the last deglaciation in central Asia, reconstructed by pollen data from Yili Valley, NW China

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dc.contributor.authorZhao, KLen_AU
dc.contributor.authorLi, XQen_AU
dc.contributor.authorDodson, JRen_AU
dc.contributor.authorZhou, XYen_AU
dc.contributor.authorAtahan, Pen_AU
dc.date.accessioned2014-11-06T05:26:02Zen_AU
dc.date.available2014-11-06T05:26:02Zen_AU
dc.date.issued2013-02-15en_AU
dc.date.statistics2014-11-06en_AU
dc.description.abstractAn extended pollen record with grain size analysis and AMS C-14 dating is provided for a palaeolake section which is located in an intermountain basin in Yili Valley, Xinjiang, NW China. Covering the late MIS 3, early MIS 2 and the last deglaciation, vegetation variations and climate events are discussed in relation to changes in pollen assemblages and Artemisia/Chenopodiaceae (A/C) ratios. The presence of montane forest-steppe dominated by Picea and Taraxacum indicates a relative humid climate in the study area during late MIS 3 (before 31.5 cal kyr BP). Picea forest disappeared and the vegetation dominated by Chenopodiaceae shows the climate became dry from 31.5 to 14.7 cal kyr BP. The sediments of Last Glacial Maximum (LGM) period are absent in the section probably. Betula-Picea mixed forest occurred at 14.7 cal kyr BP and corresponds to the onset of the warm Bolling period in the North Atlantic. A long dry period was detected from 14.5 to 13.6 cal kyr BP on the basis of the occurrence of Chenopodiaceae desert. A subalpine meadow community dominated by Geranium covered the area during 13.6-13.4 cal kyr BP, suggesting lower temperatures at this time. This may coincide with the Older Dryas (OD). The most humid period in the record occurred between 13.4 and 12.9 cal kyr BP, which coincides with the warm Allerod period. Dry conditions prevailed from similar to 12.9 to 11.7 cal kyr BP in the area, coinciding with the Younger Dryas (YD) in the North Atlantic. Within this period a three-phase climate fluctuation was detected, which can be summarized as follows: a dry early YD (12.9-12.6 cal kyr BP), a slightly moister mid-YD (12.6-12.0 cal kyr BP) and a very dry late YD (12.0-11.7 cal kyr BP). These millennial to century-scale climatic events in Yili Valley correlate well with other palaeoclimate records in North Hemisphere, suggesting that these events probably originate from same mechanisms. © 2013, Elsevier Ltd.en_AU
dc.identifier.citationZhao, K. L., Li, X. Q., Dodson, J., Zhou, X. Y., & Atahan, P. (2013). Climate instability during the last deglaciation in central Asia, reconstructed by pollen data from Yili Valley, NW China. Review of Palaeobotany and Palynology, 189, 8-17. doi:10.1016/j.revpalbo.2012.10.005en_AU
dc.identifier.govdoc5329en_AU
dc.identifier.issn0034-6667en_AU
dc.identifier.journaltitleReview of Palaeobotany and Palynologyen_AU
dc.identifier.pagination8-17en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.revpalbo.2012.10.005en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6020en_AU
dc.identifier.volume189en_AU
dc.language.isoenen_AU
dc.publisherElsevier Science BVen_AU
dc.subjectValleysen_AU
dc.subjectPollenen_AU
dc.subjectSea levelen_AU
dc.subjectGlaciersen_AU
dc.subjectAsiaen_AU
dc.subjectChinaen_AU
dc.titleClimate instability during the last deglaciation in central Asia, reconstructed by pollen data from Yili Valley, NW Chinaen_AU
dc.typeJournal Articleen_AU
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