Modeling of NLC and PMSE in the northern and southern hemispheres

Details Modeling of NLC and PMSE in the northern and southern hemispheres Modeling of NLC and PMSE in the northern and southern hemispheres

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa31a..08b&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA31A-08

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0340 Middle Atmosphere: Composition And Chemistry, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 0342 Middle Atmosphere: Energy Deposition (3334)

Scientific paper

Special layers form in the summer mesopause region at altitudes between 82 and 92 km poleward of 50° latitude, causing phenomena such as noctilucent clouds (NLC) and polar mesospheric summer echoes (PMSE). The strong simularities of the spatial and seasonal occurrence zones make it highly likely that both phenomena have a common cause due to formation of icy particles. In the frame of model studies by our LIMA-ICE (Leibniz Institute Middle Atmosphere model) GCM we explored the morphology of these ice clouds in order to investigate the major physical processes, e.g. the microphysics of icy particles, the interaction of icy particles with atmospheric background water , the sensitivity of ice formation and cloud brightness due to variable thermal conditions, effects of 3-d transports, etc. This paper will focus on 6 northern and southern summer seasons during 2001-2006 where we will discuss the thermal northern/southern summer mesopause conditions, their similarities and differences, respectively, of NLC and PMSE formation in terms of occurrence rates, brightness, mean altitude, and seasonal duration. Using solar mean condition for every year, our model allows a quantification of seasonal natural variability of winds and temperatures in the absence of solar variability of each hemispheric summer and the subsequent highly variable structure of ice clouds. Through comparison with real observations, e.g. satellite data, this may help to identify the strength of solar induced forcing to the mesopause region. As results we will present statistics about north/south NLC/PMSE differences, their latitudinal and seasonal distribution, and tidal structures.

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