全球CO2浓度与印度夏季风在309 - 260 kyr BP之间的联系

IF 2.6 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology Pub Date : 2025-03-18 DOI:10.1016/j.palaeo.2025.112906

Som Dutt , Anil K. Gupta , Jooly Jaiswal , Hai Cheng , Priyantan Gupta

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引用次数: 0

摘要

北阿坎德邦Bhiar Dhar洞穴的氧同位素比值δ18O变化的洞穴记录表明，喜马拉雅西北地区在海洋同位素阶段(MIS)-9晚期和MIS-8早期的印度夏季风（ISM）条件下的亚千年尺度变化。结果表明，在309 ~ 292和286 ~ 264 kyr BP期间，ISM条件较弱，在291 ~ 287 kyr BP期间ISM条件较强。在~ 287 kyr BP观测到与ISM相关的降水突然激增，此后ISM继续减弱。氧同位素比值表明，在季风中度增强时，在~ 286 ~ 264 kyr BP存在微弱的ISM变化。309 ~ 260 kyr BP期间，研究区ISM降水的轨道尺度变化似乎是由全球冰盖和大气CO2浓度叠加北半球太阳日照驱动的。

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Linkage between global CO2 concentration and Indian summer monsoon between 309 and 260 kyr BP

A speleothem record of oxygen isotope ratios δ¹⁸O) changes from the Bhiar Dhar cave, Uttarakhand suggests sub-millennium scale variability in Indian summer monsoon (ISM) conditions in the northwestern Himalaya during late marine isotope stage (MIS)-9 and early MIS-8. The results indicate the weakening ISM conditions between 309 and 292 kyr BP and from 286 to 264 kyr BP, and strong ISM from 291 to 287 kyr BP. An abrupt surge in ISM-linked precipitation is observed at ∼287 kyr BP, following which the ISM remained weakened. The oxygen isotope ratio suggests a weak ISM with moderate variations from ∼286 to 264 kyr BP when the monsoon was moderately strengthened. The orbital scale changes in the ISM rainfall from 309 to 260 kyr BP in the study area appear to have been driven by the global ice cover and atmospheric CO₂ concentration superimposed by the northern hemisphere solar insolation.

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来源期刊

Palaeogeography, Palaeoclimatology, Palaeoecology 地学-地球科学综合

CiteScore

5.90

自引率

10.00%

发文量

398

审稿时长

3.8 months

期刊介绍： Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.