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

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

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3416701k&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 16, CiteID L16701

Physics

15

Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Cryosphere: Ice Cores (4932), Geographic Location: Asia, Atmospheric Processes: Paleoclimatology (0473, 4900)

Scientific paper

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.

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