Publication Date:
2024-05-30
Description:
〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉Abstract〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉The interpretation of stalagmite δ〈sup〉18〈/sup〉O 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. δ〈sup〉18〈/sup〉O, δ〈sup〉13〈/sup〉C, and X/Ca values exhibit clear precessional cycles, with δ〈sup〉18〈/sup〉O 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.〈/p〉
Description:
Plain Language Summary: While it is well known that global changes have led to variations in the intensity and spatial distribution of Asian monsoon precipitation, the mechanisms behind this are not well understood. Paleoclimate records are essential for revealing the drivers behind monsoon variation. However, speleothem records from the Asian monsoon region rarely provide direct information on the amount of rainfall. Here we report on multiple indicator data sets from a stalagmite in southwestern China. It could help explore the variation of monsoon precipitation over the last ∼100,000 years. We find that the increase/decrease of Northern Hemisphere summer insolation controls the increase/decrease of Asian summer monsoon rainfall. In addition, global ice volume moderates the magnitude of rainfall response to insolation, and precipitation decreases significantly during high ice volume periods. Based on the present paleo‐precipitation records evidence, the existence of the spatial pattern of increasing/decreasing rainfall in central China corresponding to decreasing/increasing rainfall in northern and southern China remains ambiguous on the orbital scales, although the feature has been captured by some of the model simulations.〈/p〉
Description:
Key Points:
〈list list-type="bullet"〉
〈list-item〉
〈p xml:lang="en"〉Stalagmite trace elements are indicators of regional hydrological environmental variations in Southwestern China〈/p〉〈/list-item〉
〈list-item〉
〈p xml:lang="en"〉Northern Hemisphere summer insolation and global ice volume modulate the phase and amplitude variations of regional hydrological environment〈/p〉〈/list-item〉
〈list-item〉
〈p xml:lang="en"〉The meridional tripolar spatial pattern of precipitation in monsoon region in China on the orbital scale remains ambiguous〈/p〉〈/list-item〉
〈/list〉
〈/p〉
Description:
German Science Grant
Description:
Structure and Innovation Fund of the Region of Baden Württemberg
Description:
China Scholarship Council
http://dx.doi.org/10.13039/501100004543
Description:
National Nature Science Foundation of China
Description:
Yunnan Fundamental Research Projects
Description:
Young and Middle‐age Academic and Technical Leader in Yunnan Province
Description:
https://doi.org/10.5281/zenodo.10072475
Keywords:
ddc:551
;
stalagmite
;
trace elements
;
Asian summer monsoon
;
Northern Hemisphere summer insolation
;
global ice volume
;
regional hydrological environment
Language:
English
Type:
doc-type:article
Permalink
