HR: 0830h
AN: SA51A-0488    [PDF]
TI: Early and Late Season Increases in PMC Occurrence Frequency in the 1978 to 2000 Time Period
AU: * Rusch, D W
EM: dave.rusch@lasp.colorado.edu
AF: Laboratory for Atmospheric and Space Physics Campus Box 392, University of Colorado, Boulder, CO 80309 United States
AU: Thomas, G E
EM: gary.thomas@lasp.colorado.edu
AF: Laboratory for Atmospheric and Space Physics Campus Box 392, University of Colorado, Boulder, CO 80309 United States
AU: DeLand, M T
EM: matthew_deland@sesda.com
AF: Science Systems and Applications, Inc, 10210 Greenbelt Rd. Suite 400, Lanham, MD 20706 United States
AU: Shettle, E P
EM: eric.shettle@nrl.navy.mil
AF: Remote Sensing Division, Naval Research Laboratory Code 7227, Washington, DC 20375 United States
AU: Olivero, J J
EM: oliveroj@erau.edu
AF: Department of Physical Sciences, Embry-Riddle University, Daytone Beach, FL 32114 United States
AB: 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.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0340 Middle atmosphere--composition and chemistry
SC: SPA - Aeronomy [SA]
MN: 2003 Fall Meeting