AGU journal highlights -- Sept. 6, 2007(ential rain to southern Asia. Noting tha...)

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

---

3. Ozone-destroying chemicals wane

Halogenated hydrocarbon pollutants, which are chemicals used in manufacturing that destroy ozone, break down in the atmosphere, forming hydrogen chlorid
'/>"/>

Contact: Peter Weiss pweiss@agu.org 202-777-7507 American Geophysical Union Source:Eurekalert

0 GOOD

Page: 1 2 3 4 5 6 7 8 9 10 11
Related biology news :

1. UCLA Study Shows One-Third of Drug Ads in Medical Journals Do Not Contain References Supporting Medical Claims
2. Recent breakthroughs in common adult leukemia highlighted in New England Journal of Medicine
3. Leukemia Drug Breakthrough Study In New England Journal Of Medicine
4. Open Access journals get impressive impact factors
5. Funding and bureaucracy, not access to journals, are chief obstacles to scientific productivity
6. New journal article urges use of animal serum-free media for growing live cells
7. Impressive new Impact Factors for BioMed Centrals open-access journals
8. Public Library of Science to launch new, open access journal on neglected tropical diseases
9. Are journal rankings distorting science?
10. New book highlights worlds borderless conservation areas
11. Learning to love bacteria: Stanford scientist highlights bugs benefits