The climatic cyclicity in semiarid‐arid central Asia over the past 500,000 years
Hai Cheng,Hai Cheng,Pingzhong Zhang,Christoph Spötl,Richard Lawrence Edwards,Yanjun Cai,Dezhong Zhang,W. C. Sang,Ming Tan,Zhisheng An +9 more
TLDR
In this article, a high-resolution, absolutely-dated oxygen isotope (δ18O) records of stalagmites from Kesang Cave characterize a dynamic precipitation history over most of the past 500,000 years.Abstract:
[1] Central Asia is currently a semiarid-arid region, dominated by the Westerlies. It is important to understand mechanisms of climate and precipitation changes here, as water availability in the region is crucial today and in the future. High-resolution, absolutely-dated oxygen isotope (δ18O) records of stalagmites from Kesang Cave characterize a dynamic precipitation history over most of the past 500,000 years. This record demonstrates, for the first time, that climate change in the region exhibits a processional rhythm with abrupt inceptions of low δ18O speleothem growth at times of high Northern Hemisphere summer insolation followed by gradual δ18O increases that track decreases of insolation. These observations and interpretations contrast with the interpretation of nearby, but higher elevation ice core records. The absolutely-dated caveδ18O shifts can be used to correlate the regional climate variability by providing chronological marks. Combined with other paleoclimate records, the Kesang observations suggest that possible incursions of Asian summer monsoon rainfall or related moisture into the Kesang site and/or adjacent areas during the high insolation times may play an important role in changing orbital-scale hydrology of the region. Based on our record, arid climate will prevail in this region for the next several millennia, providing that anthropogenic effects do not supersede natural processes.read more
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An optimized scheme of lettered marine isotope substages for the last 1.0 million years, and the climatostratigraphic nature of isotope stages and substages
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The Global Paleomonsoon as seen through speleothem records from Asia and the Americas
TL;DR: In this article, a comprehensive synthesis of globally-distributed speleothem δ18O records from the Asian and South American monsoon regions is presented, highlighting three aspects of the GPM that are comparable to the modern GM: (1) the intensity swings on different timescales; (2) their global extent; and (3) an anti-phased inter-hemispheric relationship between the ASP and SPM on a wide range of timecales.
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TL;DR: The second synthesis of the PAGES GM Working Group following the first synthesis “The Global Monsoon across Time Scales: coherent variability of regional monsoons” published in 2014 (Climate of the Past, 10, 2007-2052) as mentioned in this paper addresses driving mechanisms of global monsoon variability and outstanding issues in GM science.
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High-precision and high-resolution carbonate 230Th dating by MC-ICP-MS with SEM protocols
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TL;DR: In this paper, the secondary electron multiplier (SEM) protocol for multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS) has been developed for high-precision and high-resolution 230Th dating of coral and speleothem carbonates.
References
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Journal ArticleDOI
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