Northern Hemisphere Summer Insolation and Ice Volume Driven Variations in Hydrological Environment in Southwest China
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/11793
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The interpretation of stalagmite δ18O in terms of reflecting Asian summer monsoon (ASM) precipitation is still elusive. Here, we present high‐resolution stalagmite trace element ratios (X/Ca, X = Mg, Sr, Ba) records from southwest China covering 116.09 to 4.07 ka BP. δ18O, δ13C, and X/Ca values exhibit clear precessional cycles, with δ18O values reflecting ASM circulation/intensity, while X/Ca ratios capture local precipitation or evapotranspiration variations. Our results show that Northern Hemisphere summer insolation (NHSI) is the main driver of ASM intensity and precipitation phase variation, but global ice volume modulates the response magnitude of summer precipitation to insolation. During the Last Glacial Maximum, high ice volumes caused significant monsoon precipitation to decrease. In contrast to modern observations of the tripolar distribution of precipitation in China, our record is consistent with paleo‐precipitation records in southern and northern China.
Stalagmite trace elements are indicators of regional hydrological environmental variations in Southwestern China
Northern Hemisphere summer insolation and global ice volume modulate the phase and amplitude variations of regional hydrological environment
The meridional tripolar spatial pattern of precipitation in monsoon region in China on the orbital scale remains ambiguous
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Schlagworte:
stalagmitetrace elements
Asian summer monsoon
Northern Hemisphere summer insolation
global ice volume
regional hydrological environment