Regional moisture source changes inferred from late holocene stable isotope records

Liu, Z., Henderson, A.C.G. and Huang, Y. (2008) Regional moisture source changes inferred from late holocene stable isotope records. Advances in Atmospheric Sciences, 25(6), pp. 1021-1028. (doi: 10.1007/s00376-008-1021-5)

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Qinghai Lake, China, is located near the northern limit of the East Asian summer monsoon (EASM) and thus is an ideal region for studies of past monsoonal changes. However, isotope records from this region reflect the combined effects of multiple climatic factors, and make climatic interpretations difficult. The authors use multi-proxy records, generated from the same sediment core from Qinghai Lake, to disentangle these multiple effects in isotope records and to infer EASM variability during the late Holocene. Records of leaf wax (C<sub>28</sub>) δD, lake carbonate δ<sup>18</sup>O and the Dunde ice core δ<sup>18</sup>O all indicate a millennial-scale depletion of mean isotopic values at ∼1500–1250 years before present. Compared with independent lake temperature and salinity records, the authors suggest that this depletion of long-term mean isotopic values must have resulted from changes in moisture sources in this region. In contrast, the authors attribute high-frequency (centennial timescale) C<sub>28</sub>δD and ice core δ<sup>18</sup>O variability dominantly to a temperature effect. The multiproxy records provide a coherent picture in that many aspects of this regional climate (temperature, dryness, and moisture source) are strongly linked to the EASM variability.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Henderson, Dr Andrew
Authors: Liu, Z., Henderson, A.C.G., and Huang, Y.
Subjects:G Geography. Anthropology. Recreation > G Geography (General)
College/School:College of Science and Engineering > School of Geographical and Earth Sciences
Journal Name:Advances in Atmospheric Sciences
ISSN (Online):1861-9533
Published Online:13 November 2008

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