Variation of the Asian summer monsoon during the MIS 5a/5b period inferred from a new high-resolution stalagmite record
Abstract：Due to the paucity of the high-resolution records of the Asian summer monsoon (ASM) during the marine isotope stage (MIS) 5,our understanding about the ASM in this period is limited.In this study,a 38 -yr resolution stalagmite oxygen isotope record from the Yangkou Cave,Chongqing,southwestern China,is used to reconstruct the detailed evolution of the ASM during the period of MIS 5a/5b.The Yangkou record exhibits a close correlation between the ASM and the climate of the North Atlantic at a centennial-millennial-scale.In terms of the precise 230Th dating with error less than 0.4％,the onset and termination of Chinese Interstadial (CIS) 22 are constrained to 91.2±0.3 ka BP and 88.9±0.3 ka BP,respectively,and the beginning of the CIS 21 is defined at 84.6±0.3 ka BP.In addition,the evolution pattern of CIS 22 and CIS 21 recorded in the stalagmite from the Yangkou Cave is slightly different from those recorded in NGRIP,which is anti-phased with the trend of temperature change in the Antarctica.We speculate that the ASM during MIS 5a/5b may be affected by climate variation in the southern hemisphere.
Keywords：Asian summer monsoonstalagmite δ18Omarine isotope stage 5a/5b230Th datingclimate change in the southern hemisphere
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 162-170 )