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

er pole and downwelling and heating at the winter pole. This circulation creates extremely cold temperatures at the top of the mesosphere above the summer pole, often causing ice clouds called noctilucent clouds to form. Through data from the Swedish satellite Odin, Karlsson et al. study noctilucent clouds in order to estimate the average state of mesospheric circulation. They compare these conditions with the state of the stratosphere and find that an abundance of noctilucent clouds in the summer mesosphere coincides with cold winter stratospheric temperatures in the opposite hemisphere. This cross-hemispheric correlation operates such that fluctuations in the winter stratosphere lead the summer mesosphere response by several weeks. Although models have predicted such a correlation, the authors expect that the documentation of this phenomenon will help refine predictions of future atmospheric behavior.

Title:
Evidence for interhemispheric stratosphere-mesosphere coupling derived from noctilucent cloud properties

Authors:
B. Karlsson, H. Krnich, and J. Gumbel: Department of Meteorology, Stockholm University, Stockholm, Sweden.

Source:
Geophysical Research Letters (GRL) paper 10.1029/2007GL030282, 2007, http://dx.doi.org/10.1029/2007GL030282


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

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