Ice at the Mesopause: What Do HALOE Measurements Predict?

Details Ice at the Mesopause: What Do HALOE Measurements Predict? Ice at the Mesopause: What Do HALOE Measurements Predict?

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa51b..03o&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA51B-03

Physics

0300 Atmospheric Composition And Structure, 0305 Aerosols And Particles (0345, 4801), 0320 Cloud Physics And Chemistry, 0340 Middle Atmosphere: Composition And Chemistry, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334)

Scientific paper

Water ice is strongly implicated as the major component of polar mesospheric clouds (PMC), noctilucent clouds (NLC) and probably polar mesospheric summer echo (PMSE) layers. Hervig et al [2001] have recently shown the infrared spectral signature of water ice in HALOE solar occultation observations in suspected PMC layers. We have taken a complementary approach by asking whether there is other evidence that ice can form in these locations. We have used 10-years of UARS-HALOE temperature and water vapor data in order to investigate whether ice saturation occurs routinely at the summer, high latitude mesopause. The data reveal that regions of ice saturation as well as supersaturation occur precisely where satellite observations of PMC tend to occur. The HALOE data predict the PMC distribution in latitude, altitude, and day of the year. There is even a rough correspondence between the occurrence frequency of PMC at a particular day and location with the percentage of the time that ice supersaturation is calculated to occur there. This appears to be the first time that such comparisons have been made for a near-global data set, including both northern and southern hemispheres.

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