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GEOPHYSICAL RESEARCH LETTERS,
VOL. 34,
L16701,
6 PP., 2007
doi:10.1029/2007GL030440
Reduction in northward incursions of the South Asian monsoon since ∼1400 AD inferred from a Mt. Everest ice core
Climate Change Institute and Department of Earth Sciences, University of Maine, Orono, Maine, USA
Climate Change Institute and Department of Earth Sciences, University of Maine, Orono, Maine, USA
Joint Key Laboratory of Cryosphere and Environment, Lanzhou, China
Joint Key Laboratory of Cryosphere and Environment, Lanzhou, China
Climate Change Institute and Department of Earth Sciences, University of Maine, Orono, Maine, USA
Joint Key Laboratory of Cryosphere and Environment, Lanzhou, China
Climate Change Institute and Department of Earth Sciences, University of Maine, Orono, Maine, USA
Climate Change Institute and Department of Earth Sciences, University of Maine, Orono, Maine, USA
Climate Change Institute and Department of Earth Sciences, University of Maine, Orono, Maine, USA
Climate Change Institute and Department of Earth Sciences, University of Maine, Orono, Maine, USA
Climate Change Institute and Department of Earth Sciences, University of Maine, Orono, Maine, USA
Joint Key Laboratory of Cryosphere and Environment, Lanzhou, China
Joint Key Laboratory of Cryosphere and Environment, Lanzhou, China
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 ∼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 ∼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.
Received 19 April 2007; accepted 19 July 2007; published 16 August 2007.
Citation: (2007), Reduction in northward incursions of the South Asian monsoon since ∼1400 AD inferred from a Mt. Everest ice core, Geophys. Res. Lett., 34, L16701, doi:10.1029/2007GL030440.
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