Early and Late Season Increases in PMC Occurrence Frequency in the 1978 to 2000 Time Period

Details Early and Late Season Increases in PMC Occurrence Frequency in the 1978 to 2000 Time Period Early and Late Season Increases in PMC Occurrence Frequency in the 1978 to 2000 Time Period

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa51a0488r&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SA51A-0488

Physics

0305 Aerosols And Particles (0345, 4801), 0340 Middle Atmosphere: Composition And Chemistry

Scientific paper

We have examined 23 years of SBUV data for changes in the seasonal distribution of PMC occurrence. In the north there are significant increases in the relative proportion of clouds that occur at the beginning of the season (between 20 and 40 days prior to solstice) and at the end of the season (60 to 80 days after solstice). In the south, significant relative increases are seen at the end of the season (50 to 70 days after solstice) but not in the beginning of the season. We found no evidence that the length of the season has changed. Because the SBUV instruments are sensitive to the brighter clouds, the results indicate that the relative number of bright clouds has increased over time at the beginning and end of the cloud season.

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