Heinrich event 4 and Dansgaard/Oeschger events 5-10 recorded by high-resolution speleothem oxygen isotope data from central China
Journal
Quaternary Research (United States)
Journal Volume
82
Journal Issue
2
Pages
394-404
Date Issued
2014
Author(s)
Abstract
A 50-yr resolution reconstruction of climate and environment variability during the period 43-14ka was developed using 26 high-precision U/Th dates and 390 oxygen isotope (δ18O) data of a stalagmite (SJ1) collected from Songjia Cave in central China, which is close to the northwestern boundary of the Asian summer monsoon (ASM). The δ18O record in SJ1 displays significant millennial-scale changes that correlate well in timing and duration with Dansgaard/Oeschger (D/O) events 5-10 and Heinrich event 4 (H4) identified in high-latitude regions of the Northern Hemisphere. Four 230Th dates constrain the H4 event precisely to the period of 39.7 to 38.3ka. Notable centennial variations of the ASM activity could be observed within the H4 event. The magnitude and duration of D/O event 4.1 recorded in SJ1 are similar to those archived in east China but different from those documented in southwest China, suggesting that the manifestation of this event may be regionally different. The timing, duration and structure of D/O events 5-10 and Heinrich event 4 suggest that temperature changes in both hemispheres have exerted significant influences on the ASM variations in central China. © 2014 University of Washington.
Subjects
Asian summer monsoon; Central China; Dansgaard/Oeschger event; Heinrich event; δ18O
SDGs
Other Subjects
Atmospheric thermodynamics; Isotopes; Asian summer monsoons; Central chinas; Dansgaard/Oeschger event; Heinrich Events; High-latitude regions; Northern Hemispheres; Southwest China; Temperature changes; Oxygen
Type
journal article