Late Pleistocene - Early Holocene glacial dynamics, Asian palaeomonsoon variability and landscape change at Lake Shudu, Yunnan Province, southwestern China

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Late Pleistocene - Early Holocene glacial dynamics, Asian palaeomonsoon variability and landscape change at Lake Shudu, Yunnan Province, southwestern China

Show simple item record Cook, Charlotte Govett en_GB 2010-03-15T12:56:26Z en_GB 2011-01-25T17:12:31Z en_US 2013-03-21T11:38:31Z 2009-09-29 en_GB
dc.description.abstract A lack of well-distributed, high-resolution records of Late Quaternary Asian palaeomonsoon variability remains an outstanding issue for palaeoclimatologists, and is especially marked in remote regions such as the mountains of southwestern China (Wang et al., 2005). Characterising the nature, timing and magnitude of climate variability in southwestern China is essential for understanding the regional climate as a whole, and the potential social, economic and environmental impacts that may result from Asian monsoon system changes. The NERC-funded research presented in this thesis focuses on a high altitude lake sediment record obtained from Lake Shudu, Yunnan Province, China. The lake is located on the southeastern edge of the Tibetan Plateau. The primary aims of this research were to identify and examine key environmental and climatic shifts which occurred in southwestern China during the Late Pleistocene (Dali) - Early Holocene Period; to examine the possible drivers of these changes; and to compare the findings with other regional proxy records in order to better understand climate dynamics in southwestern China. These aims were chosen in order to test the hypothesis that Late Quaternary millennial to centennial scale climatic and environmental changes in southwestern China were driven by changes in solar insolation and / or glacial climate boundary conditions, characterised by stepwise increases in palaeomonsoon intensity. AMS 14C radiocarbon dates obtained from bulk sediment samples and pollen concentrations indicated that the seven metre core (06SD) that forms the focus of this research spans the last c. 22.6 ka cal. yr BP, making it one of the longest high-resolution Late Quaternary records available for southwestern China. 06SD was examined using a multi-proxy approach incorporating physical, organic and palaeoecological analyses. The record captures the shift from colder, drier Pleistocene (Dali) conditions to warmer, wetter Holocene conditions and is punctuated by two events. The first event, centred at c. 17.3 ka cal. yr BP, possibly represents a phase of warmer and / or wetter conditions in response to rising solar insolation during the deglacial period. The second event, commencing at c. 11.7 ka cal. yr BP, possibly denotes the Pleistocene - Holocene Boundary. Overall, the findings of this research support the view that during the Late Pleistocene, Asian summer monsoon strengthening was non-linear and driven by changes in glacial dynamics and / or solar insolation. en_GB
dc.description.sponsorship Natural Environment Research Council (NERC) en_GB
dc.identifier.grantnumber NER/S/A/2005/13320 en_GB
dc.identifier.uri en_GB
dc.language.iso en en_GB
dc.publisher University of Exeter en_GB
dc.rights.embargoreason I wish to place an embargo on my thesis for a standard period of 18 months because I wish to publish papers using material that is substantially drawn from my thesis. en_GB
dc.rights.embargoreason Extending embargo for 6 months to allow completion of publication process - JE en_US
dc.subject Multi-proxy analysis en_GB
dc.subject Lake sediments en_GB
dc.subject Palaeomonsoon variability en_GB
dc.subject Palaeoecology en_GB
dc.subject Palynology en_GB
dc.subject Stable isotopes en_GB
dc.title Late Pleistocene - Early Holocene glacial dynamics, Asian palaeomonsoon variability and landscape change at Lake Shudu, Yunnan Province, southwestern China en_GB
dc.type Thesis or dissertation en_GB 2012-03-02T05:00:05Z en_US 2013-03-21T11:38:31Z
dc.contributor.advisor Jones, Richard Thomas en_GB
dc.contributor.advisor Caseldine, Christopher en_GB
dc.description Note that there are two version of the thesis one of which is unavailable due to the inclusion of copyrighted material. All such material has been removed from file CookCG_TPC.pdf which can be freely used. en_US
dc.publisher.department Geography en_GB
dc.type.degreetitle PhD in Geography en_GB
dc.type.qualificationlevel Doctoral en_GB
dc.type.qualificationname PhD en_GB

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