Reduction in northward incursions of the South Asian monsoon since ≈1400 AD inferred from a Mt. Everest ice core

被引:86
作者
Kaspari, S. [1 ]
Mayewski, P.
Kang, S.
Sneed, S.
Hou, S.
Hooke, R.
Kreutz, K.
Introne, D.
Handley, M.
Maasch, K.
Qin, D.
Ren, J.
机构
[1] Univ Maine, Climate Change Inst, Orono, ME 04469 USA
[2] Univ Maine, Dept Earth Sci, Orono, ME 04469 USA
[3] Joint Key Lab Cryosphere & Environm, Lanzhou 730000, Peoples R China
基金
美国国家科学基金会;
关键词
D O I
10.1029/2007GL030440
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
A highly resolved Mt. Everest ice core reveals a decrease in marine and increase in continental air masses related to relatively high summer surface pressure over Mongolia, and reduction in northward incursions of the summer South Asian monsoon since similar to 1400 AD. Previously published proxy records from lower sites south of the Himalayas indicate strengthening of the monsoon since this time. These regional differences are consistent with a south north seesaw in convective activity in the Asian monsoon region, and reflect a southward shift in the mean summer position of the monsoon trough since similar to 1400 AD. The change in monsoonal circulation at 1400 AD is synchronous with a reduction in solar irradiance and the onset of the LIA. This demonstrates a hemispheric scale circulation reorganization at this time, and the potential for future large shifts in monsoonal circulation.
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页数:6
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