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AGU journal highlights -- Sept. 6, 2007
Date:9/10/2007

ential rain to southern Asia. Noting that few detailed long-term records of monsoon variability exist, Kaspari et al. analyze data from a recently retrieved ice core from a glacier on the northeast ridge of Mt. Everest. A decrease in sea salt aerosols and isotopically heavy water and an increase in dust in the core's yearly ice layers indicate that the Himalayas experienced a decrease in marine and an increase in continental air masses. This is interpreted as a reduction in northward incursions of the summer South Asian monsoon since about AD 1400. Previously published records from south of the Himalayas indicate a strengthening of the monsoon since this time. The authors hypothesize that the difference reflects a southward shift in the average summer position of the monsoon trough since the 15th century. They note that the change in monsoon circulation seen here is synchronous with a reduction in solar irradiance and the onset of the Little Ice Age.

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

Authors:
S. Kaspari, S. Sneed, R. Hooke, K. Kreutz, D. Introne, M. Handley, and K. Maasch: Climate Change Institute and Department of Earth Sciences; University of Maine, Orono, Maine, U.S.A.;
P. Mayewski: Climate Change Institute and Department of Earth Sciences; University of Maine, Orono, Maine, U.S.A, and Joint Key Laboratory of Cryosphere and Environment, Lanzhou, China;
S. Kang, S. Hou, D. Qin, and J. Ren: Joint Key Laboratory of Cryosphere and Environment, Lanzhou, China.

Source:
Geophysical Research Letters (GRL) paper 10.1029/2007GL030440, 2007, http://dx.doi.org/10.1029/2007GL030440


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Halogenated hydrocarbon pollutants, which are chemicals used in manufacturing that destroy ozone, break down in the atmosphere, forming hydrogen chlorid
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Contact: Peter Weiss
pweiss@agu.org
202-777-7507
American Geophysical Union
Source:Eurekalert

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