SOUTH CHINA SEA
; EMPIRICAL MODE DECOMPOSITION
; SCALE CLIMATE VARIABILITY
; ISOTOPE STAGE 19
; MILLENNIAL-SCALE
; HIGH-RESOLUTION
; NORTH-ATLANTIC
; EQUATORIAL INSOLATION
; HOLOCENE
; RECORD
WOS学科分类:
Geosciences, Multidisciplinary
WOS研究方向:
Geology
英文摘要:
The empirical mode decomposition (EMD) method is used to re-analyse the high-resolution and precisely-dated stalagmite record from Chinese caves over the past 640 ka. Results show that (1) the variation in the Asian Monsoon can be completely decomposed into ten quasiperiod oscillations, among which the precession and semiprecession band oscillations are the most prominent periodicities, with contribution rates of 31.1% and 30.7%, respectively; (2) the cross-spectrum analysis of the semiprecession component and bi-hemisphere insolation (BHI) are strongly correlated, indicating an amplified response of precipitation and temperature variability to the interhemispheric insolation in the low-latitude regions, thus further affecting the intensity of the Asian Monsoon; (3) on millennial timescales, obvious oscillations at the 5 ka and 1-2 ka bands roughly correspond to the classical Bond and Dansgaard-Oeschger (DO) cycles. Additionally, a strong correlation is found between the detrended stalagmite (18)delta O records and Ca/Sr sequence from the North Atlantic (especially at the 5 ka band). This result means that the 5 ka cycle is characteristic of the glacial-interglacial cycle since the middle and late Pleistocene and may imply that climate change on the millennial timescale is the result of an interaction between global ice volume and insolation.
1.Nanjing Normal Univ, Sch Geog Sci, Minist Educ, Key Lab Virtual Geog Environm, Nanjing 210023, Jiangsu, Peoples R China 2.State Key Lab Cultivat Base Geog Environm Evolut, Nanjing 210023, Jiangsu, Peoples R China 3.Jiangsu Ctr Collaborat Innovat Geog Environm Reso, Nanjing 210023, Jiangsu, Peoples R China
Recommended Citation:
Zeng, Yalan,Chen, Shitao,Yang, Shaohua,et al. Multiscale analysis of Asian Monsoon over the past 640 ka[J]. SCIENCE CHINA-EARTH SCIENCES,2019-01-01,62(5):843-852