Multi-Decadal Variations in the Brightness of Polar Mesospheric Clouds

Details Multi-Decadal Variations in the Brightness of Polar Mesospheric Clouds Multi-Decadal Variations in the Brightness of Polar Mesospheric Clouds

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa51a..02s&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SA51A-02

Mathematics

Logic

0305 Aerosols And Particles (0345, 4801), 0340 Middle Atmosphere: Composition And Chemistry, 0360 Transmission And Scattering Of Radiation, 1610 Atmosphere (0315, 0325), 1640 Remote Sensing

Scientific paper

The Solar Backscatter Ultraviolet (SBUV and SBUV/2) instruments on the NOAA polar-orbiting meteorological satellites have measured the properties of Polar Mesospheric Clouds (PMC) continuously since 1978. Over much of this time period there have been two (and occasionally three) SBUV/2 instruments making measurements simultaneously, allowing us to combine data from the multiple instruments to study long-term PMC behavior. The seasonally averaged PMC albedo measured by each of the SBUV instruments at a wavelength of 252 nm provides a measure of the PMCs brightness. These PMC albedos show a clear anti-correlation with the solar activity as measured by the solar Lyman-α flux. After removing this dependence on the solar activity, there is a statistically significant long-term increase in the PMC albedo in both Northern and Southern Hemispheres. The variations over the past 27 years have been examined as a function of latitude, with the results indicating that the largest changes occur at the lowest latitudes.

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