Speleothem evidence of solar modulation on the south Asia monsoon intensity

IF 8.5 1区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

npj Climate and Atmospheric Science Pub Date : 2025-03-15 DOI:10.1038/s41612-025-00971-8

Hong-Wei Chiang, Yue-Gau Chen, Shih-Yu Lee, Dung Chi Nguyen, Chuan-Chou Shen, Yin Lin, Lam Dinh Doan

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Abstract

The influence of solar variation on climate has long been debated. Here, we utilize a decadal-resolved speleothem δ¹⁸O record from Vietnam, spanning 32.5 to 27.5 kyr BP, as a proxy for regional precipitation levels. Our results show a general coherence between Total Solar Irradiance (TSI) and regional precipitation, supporting a positive climate response consistent with conventional monsoon theory. Spectral analysis on studied datasets reveals an approximately 180-year periodicity coinciding with the de Vries cycle of solar activity. Further comparing our record with 35 other speleothem records, we demonstrate the importance of sufficient age control points in capturing solar-related periodicities. Model simulation shows that TSI could enhance monsoonal circulation and regional precipitation. Also highlighted are the implications of chronology control for detecting climate events in proxy records. The new findings underscore the significance of relatively minor radiative forcing in regional climate dynamics over monsoonal Asia on decadal to centennial timescales.

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南亚季风强度受太阳调节的岩溶证据

太阳变化对气候的影响一直存在争议。在这里，我们利用越南的十年分辨洞穴δ18O记录，跨越32.5至27.5 kyr BP，作为区域降水水平的代表。我们的研究结果表明，总太阳辐照度（TSI）和区域降水之间存在普遍的一致性，支持与传统季风理论一致的积极气候响应。对研究数据集的光谱分析表明，太阳活动周期约为180年，与德弗里斯周期一致。进一步将我们的记录与其他35个洞穴记录进行比较，我们证明了足够的年龄控制点对于捕获太阳相关周期的重要性。模式模拟结果表明，TSI可以增强季风环流和区域降水。还强调了在代理记录中检测气候事件的年代学控制的含义。这些新发现强调了相对较小的辐射强迫在亚洲季风区十年至百年时间尺度上的重要意义。

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来源期刊

npj Climate and Atmospheric Science Earth and Planetary Sciences-Atmospheric Science

CiteScore

8.80

自引率

3.30%

发文量

审稿时长

21 weeks

期刊介绍： npj Climate and Atmospheric Science is an open-access journal encompassing the relevant physical, chemical, and biological aspects of atmospheric and climate science. The journal places particular emphasis on regional studies that unveil new insights into specific localities, including examinations of local atmospheric composition, such as aerosols. The range of topics covered by the journal includes climate dynamics, climate variability, weather and climate prediction, climate change, ocean dynamics, weather extremes, air pollution, atmospheric chemistry (including aerosols), the hydrological cycle, and atmosphere–ocean and atmosphere–land interactions. The journal welcomes studies employing a diverse array of methods, including numerical and statistical modeling, the development and application of in situ observational techniques, remote sensing, and the development or evaluation of new reanalyses.