气候变化领域集成服务门户(CCPortal): Drought Cycles Over the Last 8,200 Years Recorded in Maar Lake Twintaung, Myanmar

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DOI	10.1029/2019JD032225
	Drought Cycles Over the Last 8,200 Years Recorded in Maar Lake Twintaung, Myanmar
	Chu G.; Zhu Q.; Sun Q.; Su Y.; Xie M.; Zaw T.; Sein K.
发表日期	2020
ISSN	2169897X
卷号	125 期号:9
英文摘要	The tropical Asian regions are particularly prone to catastrophic droughts due to high temperature and evaporation and their sensitivity to variable oceanic-atmospheric circulation. The extent to which future global warming may intensify droughts in this populous region is a matter of utmost concern. Palaeoclimatic data can help inform scientists learn more about the temporal patterns and drivers of monsoon change over geological timescales. In this paper, we present a new 8,200 year biomarker record preserved in the annually laminated sediments of Maar Lake Twintaung, Myanmar. The δ13C27-35 sedimentary record is mainly derived from leaf wax lipids in the lake catchment, which is presently dominated by C3 vegetation in the modern lake catchment. The δ13C27-35 is mainly regulated by plant physiological and biochemical responses to drought stress and, as such, can be used as a proxy of past changes in moisture. The δ13C27–35 record reveals distinct decadal-to-centennial-scale droughts superimposed on a trend of gradually decreasing summer monsoon intensity from the mid-Holocene to late Holocene. Within the limits of the dating uncertainties, these decadal-to-centennial-scale droughts are found to be well correlated with the southward shift of the Intertropical Convergence Zone. It highlights thepimportance of the Intertropical Convergence Zone shift (tropical monsoon trough) in regulating monsoon rainfall in the region. In addition, most of the droughts are likely to be linked with active volcanism and solar minima and suggest a coupled process between external drivers and internal climate dynamics. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	annually laminated sediments; compound-specific carbon isotope; droughts; Holocene; leaf wax n-alkanes; Maar Lake Twintaung
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186033
作者单位	Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; CAS Center for Excellence in Life and Paleoenvironment, Beijing, China; Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing, China; National Research Center of Geoanalysis, Beijing, China; Institute of Geophysics, China Earthquake Administration, Beijing, China; Myanmar Geosciences Society, Yangon, Myanmar
推荐引用方式 GB/T 7714	Chu G.,Zhu Q.,Sun Q.,et al. Drought Cycles Over the Last 8,200 Years Recorded in Maar Lake Twintaung, Myanmar[J],2020,125(9).
APA	Chu G..,Zhu Q..,Sun Q..,Su Y..,Xie M..,...&Sein K..(2020).Drought Cycles Over the Last 8,200 Years Recorded in Maar Lake Twintaung, Myanmar.Journal of Geophysical Research: Atmospheres,125(9).
MLA	Chu G.,et al."Drought Cycles Over the Last 8,200 Years Recorded in Maar Lake Twintaung, Myanmar".Journal of Geophysical Research: Atmospheres 125.9(2020).