Centennial-scale Asian monsoon variability during the mid-Younger Dryas from Qingtian Cave, central China
- a College of Geography Science, Nanjing Normal University, Nanjing 210023, China
- b Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455, USA
- c Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China
The regional climate correlation within the Northern Hemisphere in the cold/dry mid-Younger Dryas event (YD) remains elusive. A key to unraveling this issue is sufficient knowledge of the detailed climate variability at the low latitudes. Here we present a high-resolution (3-yr) δ18O record of an annually laminated stalagmite from central China that reveals a detailed Asian monsoon (AM) history from 13.36 to 10.99 ka. The YD in this record is expressed as three phases, characterized by gradual onsets but rapid ends. During the mid-YD, the AM [Asian monsoon] variability exhibited an increasing trend superimposed by three centennial oscillations, well-correlated to changes in Greenland temperatures. These warming/wetting fluctuations show a periodicity of ~ 200 yr, generally in agreement with centennial changes in cosmogenic nuclides indicated by the 10Be flux [a proxy of solar activity] from the Greenland ice. This relationship implies that centennial-scale climate changes during the mid-YD are probably caused by solar output and rapidly transported over broad regions through atmosphere reorganization.
"This relationship implies that centennial-scale climate changes during the mid-YD are probably caused by solar output and rapidly transported over broad regions through atmosphere reorganization."ReplyDelete
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