Longitudinal Asymmetries in the Frequency of Low-Latitude Polar Mesospheric Clouds

Details Longitudinal Asymmetries in the Frequency of Low-Latitude Polar Mesospheric Clouds Longitudinal Asymmetries in the Frequency of Low-Latitude Polar Mesospheric Clouds

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa43b..03h&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA43B-03

Physics

0340 Middle Atmosphere: Composition And Chemistry, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 3332 Mesospheric Dynamics, 3349 Polar Meteorology

Scientific paper

Data from the Student Nitric Oxide Explorer (SNOE) have been used to explore the geographical distribution of Polar Mesospheric Clouds (PMC's) in both hemispheres. Results show that PMC's that form equator-ward of 50 degrees do so in preferred longitude sectors. In the Northern hemisphere, the low-latitude PMC observations are confined to the North American and North Atlantic regions. In the Southern hemisphere, they are confined to the longitudinal sector centered about Australia. This work investigates whether this preferred longitudinal occurrence of PMC's are a result of longitudinal asymmetries in the summertime circulation. Data from SNOE are used in conjunction with simulations from the Whole Atmosphere Community Climate Model (WACCM), a general circulation model that extends to 120 km, to better understand the relationship between PMC's and the summertime circulation in the mesosphere.

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