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AGU Journal highlights -- February 23, 2007

ics, where, instead of being marked by a sharp transition in temperature, the boundary between the troposphere and the stratosphere is a diffuse region of nearly constant temperature. Rossow and Pearl conducted a 22-year survey of tropical convection, using subsets of data from the International Satellite Cloud Climatology Project. The authors show that deep convection occurs mostly in larger, more organized convective systems, but that smaller, unorganized convective systems rarely penetrate into the stratosphere. Durations of penetration are longest for the larger systems, such as hurricanes and typhoons, which generally exceed one day. The authors suggest that the role of tropical storms should be examined more closely, since, though intermittent, they dominate stratosphere-troposphere exchanges. Further, obtaining adequate statistics on stratosphere-troposphere mixing will rely on generating and maintaining long-term data records.

Title: 22-year survey of tropical convection penetrating into the lower stratosphere

Authors: William B. Rossow: Electrical Engineering, The City University of New York/The City College, New York City, New York, U.S.A.; Cindy Pearl: NASA Goddard Institute for Space Studies, Columbia University, New York City, New York, U.S.A.

Source: Geophysical Research Letters (GRL) paper 10.1029/2006GL028635, 2007


13. Polar mesosphere summer echoes over Antarctica

Polar mesosphere summer echoes (PMSE) are strong signal power enhancements at very high radar frequencies that occur between about 80 and 95 kilometers [50 and 60 miles] in altitude (the mesosphere) near the poles during summer. These phenomena are thought to provide information on mesospheric temperatures, a parameter which may shed light on whether the polar atmospheres between the northern and southern hemisphere are different. Most studies have focused on PMSE in the northern hemisphere. Morris et al. collected th
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Contact: Peter Weiss
pweiss@agu.org
202-777-7507
American Geophysical Union
23-Feb-2007


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