Dipolar hydroclimate pattern changes in southwest China during the last deglaciation

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

npj Climate and Atmospheric Science Pub Date : 2025-02-17 DOI:10.1038/s41612-025-00940-1

Gang Xue, Yanhong Zheng, Shouyi Huang, Guangming Meng, Mei He, Yajie Wei, Ruoxin Li, Youfeng Ning, John Dodson, Hai Cheng, Yanjun Cai

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Abstract

Deciphering the driving forces behind spatial heterogeneity of regional hydroclimate changes is significant for developing strategies for water management. This study presents speleothem δ¹⁸O, δ¹³C and Mg/Ca records spanning the last deglaciation from Yingpan Cave, northeastern Yunnan in southwestern China. Speleothem δ¹³C and Mg/Ca indicate a gradual drying trend in northeastern Yunnan, aligning well with the variations in central China but contrasting with those of central-southern Yunnan. We propose that a decreased zonal sea surface temperature (SST) gradient in tropical Pacific (El Niño-like) shifted the West Pacific Subtropical High (WPSH) southwestward, leading to wetter conditions in northeastern Yunnan. Meanwhile, decreased precipitation in central-southern Yunnan was driven by weakened Indian summer monsoon rainfall associated with El Niño-like conditions, creating a dipolar hydrological pattern in Southwest China. Our results indicate that the spatial heterogeneity of hydroclimate can be modulated by the same triggers but have different processes and mechanisms and hence responses.

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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.