Extreme events in the Indian monsoon during the Bølling–Allerød interstadials as documented in a core monsoon zone speleothem record

IF 4 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL
Anil K. Gupta , Priyantan Gupta , Steven C. Clemens , Bhajendra Majhi , Hai Cheng
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Abstract

Major shifts in the Indian Summer Monsoon (ISM) are evident in a U-Th-dated composite δ18O record from Kailash Cave (KGC) in central India. The composite oxygen isotope record combines previously published data with the present data from sample KG-1, ranging in age from 14.62 to 12.97 thousand year before the Present (1950) (kyr BP), during the Bølling-Allerød (B-A) interstadials. Petrographic analysis of KG-1, spanning ∼14.44 to 13.98 kyr BP, reveals long-term coherence between the stable isotope values and petrographic elements. The KGC record shows an increase in ISM intensity with high-frequency δ18O variability during the Bølling (14.62–14.02 kyr BP), followed by stabilization in the Allerød (14.02–12.97 kyr BP) with low-frequency oscillations. At the onset of the B-A interstadials, coincident warming (cooling) in the northern (southern) hemisphere induced a bipolar see-saw effect, displacing the Intertropical Convergence Zone northward and intensifying the ISM. Multi-centennial to millennial ISM variations are driven by atmospheric temperature over the Tibetan Plateau (TP) and equatorial Indian Ocean (IO) sea surface temperature (SST) fluctuations. High-frequency monsoon shifts at multidecadal to centennial scales likely reflect extreme wet-dry episodes linked to changes in solar activity, temperature of TP and IO SST. These findings suggest that solar activity, in conjunction with coupled ocean-atmosphere interactions, have played a pivotal role in driving ISM variability during the B-A interstadials. Additionally, the increased greenhouse gas concentrations during this period might have triggered extreme climatic events, more prevalent in the warmer Bølling, serving as a modern analogue for current global warming scenario.
印度季风在b ølling - allero ød间冰期的极端事件被记录在一个核心季风区洞穴中
印度中部冈拉什洞(KGC)的u - th合成δ18O记录显示了印度夏季风(ISM)的主要变化。复合氧同位素记录将以前发表的数据与KG-1样品的现有数据相结合,其年龄范围为距今(1950年)(kyr BP)前14.62至12.97千年,处于b ølling- allero ød (B-A)间期。KG-1的岩石学分析跨越~ 14.44 ~ 13.98 kyr BP,揭示了稳定同位素值与岩石学元素之间的长期一致性。KGC记录显示,在Bølling (14.62 ~ 14.02 kyr BP)期间,ISM强度增加,δ18O高频变化,随后在Allerød (14.02 ~ 12.97 kyr BP)稳定,低频振荡。在B-A间冰期开始时,北(南)半球的同步变暖(变冷)引起了两极跷跷板效应,使热带辐合带向北移动,并加剧了ISM。青藏高原(TP)的大气温度和赤道印度洋(IO)的海表温度(SST)波动驱动了多年至千年ISM变化。在多年代际到百年尺度上的高频季风变化可能反映了与太阳活动、青藏高原和IO海温变化有关的极端干湿事件。这些发现表明,在B-A间冰期,太阳活动与耦合的海洋-大气相互作用在驱动ISM变率中发挥了关键作用。此外,这一时期温室气体浓度的增加可能引发了极端气候事件,这些事件在较暖的北半球更为普遍,是当前全球变暖情景的现代模拟。
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来源期刊
Global and Planetary Change
Global and Planetary Change 地学天文-地球科学综合
CiteScore
7.40
自引率
10.30%
发文量
226
审稿时长
63 days
期刊介绍: The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.
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