Structure Characteristics of DO 12 Climate Abrupt Event: Evidence from the stalagmite record, Shanxi province, in northern China
Journal
Acta Sedimentologica Sinica
Journal Volume
40
Journal Issue
3
Pages
765
Date Issued
2022
Author(s)
Abstract
To date，the pattern of Dansgaard-Oeschger（DO）events in response to monsoon climate is a question of greatest interest in paleoclimate research. Whether it is manifested as a single pattern or as multiple patterns remains controversial. A high-resolution oxygen isotope profile established with 239 oxygen isotope and 15230Th dates from the Dragon Cave，Shanxi province，North China，provides a detailed history of the East Asian summer monsoon （EASM）variation during the middle marine isotope stage（MIS 3）. Our records show significant millennial-scale vari⁃ ability，and are consistent in rate with DO events 11⁃12 and Heinrich event 5 recorded in other Chinese caves and in the Greenland ice core. Their close consistency supports a strong climatic link between high and low latitudes.Early in the DO 12 event，the δ18O values of stalagmite L2 remained negative，indicating the persistent intensification of the Asian summer monsoon，which is quite different from the pattern of stepwise temperature decrease recorded in the Greenland ice core after approaching the maximum. Comparison of records from different regions demonstrates that the response to the DO event of the Asian summer monsoon，and to the tropical low-latitude hydrological process， was characterized by an asymmetrical inverted V-shape. This may have been related to the release of latent heat from the southern ocean and a strengthened cross-equatorial flow（later weakened），resulting in the intertropical conver⁃ gence zone（ITCZ）gradually north（south）. By extension，the summer monsoon in Northern China started to increase continuously，and eventually wane.
Subjects
DO 12 event | East Asian summer monsoon | last glacial period | Loess Plateau | stalagmite
Type
journal article