气候变化领域集成服务门户(CCPortal): Methane; Monsoons; and Modulation of Millennial-Scale Climate

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DOI	10.1029/2020GL087613
	Methane; Monsoons; and Modulation of Millennial-Scale Climate
	Thirumalai K.; Clemens S.C.; Partin J.W.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:9
英文摘要	Earth's orbital geometry exerts a profound influence on climate by regulating changes in incoming solar radiation. Superimposed on orbitally paced climate change, Pleistocene records reveal substantial millennial-scale variability characterized by abrupt changes and rapid swings. However, the extent to which orbital forcing modulates the amplitude and timing of these millennial variations is unclear. Here we isolate the magnitude of millennial-scale variability (MMV) in two well-dated records, both linked to precession cycles (19,000- and 23,000-year periodicity): composite Chinese speleothem δ18O, commonly interpreted as a proxy for Asian monsoon intensity, and atmospheric methane. At the millennial timescale (1,000–10,000 years), we find a fundamental decoupling wherein precession directly modulates the MMV of methane but not that of speleothem δ18O, which is shown to be strikingly similar to the MMV of Antarctic ice core δ2H. One explanation is that the MMV of methane responds to changes in midlatitude to high-latitude insolation, whereas speleothem δ18O is modulated by internal climate feedbacks. ©2020. The Authors.
英文关键词	Atmospheric chemistry; Atmospheric thermodynamics; Glacial geology; Methane; Orbits; Solar radiation; Antarctic ice core; Asian monsoon; Atmospheric methanes; High Latitudes; Influence on climate; Internal climate; Midlatitudes; Orbital forcing; Climate change; climate change; ice core; methane; monsoon; orbital forcing; proxy climate record; solar radiation; speleothem; Asia; Minute virus of mice
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170389
作者单位	Department of Geosciences, University of Arizona, Tucson, AZ, United States; Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI, United States; Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States
推荐引用方式 GB/T 7714	Thirumalai K.,Clemens S.C.,Partin J.W.. Methane; Monsoons; and Modulation of Millennial-Scale Climate[J],2020,47(9).
APA	Thirumalai K.,Clemens S.C.,&Partin J.W..(2020).Methane; Monsoons; and Modulation of Millennial-Scale Climate.Geophysical Research Letters,47(9).
MLA	Thirumalai K.,et al."Methane; Monsoons; and Modulation of Millennial-Scale Climate".Geophysical Research Letters 47.9(2020).