HR: 0800h
AN: SA21A-0261 [Abstracts]
TI: The Diurnal and Seasonal Variation of PMCs Near 55° N Observed by SHIMMER and CIPS: Implications to Long Term PMC Trends
AU: * Stevens, M H
EM: michael.stevens@nrl.navy.mil
AF: Space Science Division, Naval Research Laboratory, Washington, DC 20375, United
States
AU: Englert, C R
EM: christoph.englert@nrl.navy.mil
AF: Space Science Division, Naval Research Laboratory, Washington, DC 20375, United
States
AU: Rusch, D W
EM: david.rusch@lasp.colorado.edu
AF: Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303,
United States
AU: Randall, C
EM: randall@lasp.colorado.edu
AF: Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303,
United States
AU: Benze, S
EM: susanne.benze@lasp.colorado.edu
AF: Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303,
United States
AB:
The Spatial Heterodyne Imager for Mesospheric Radicals (SHIMMER) is designed to measure OH solar
resonance fluorescence near 309 nm by imaging the Earth's limb. It has been observing OH and PMCs up to
about 58° N since March 16, 2007 from the STPSat-1 satellite. SHIMMER has a local time precession of
~30 min/day so that during the 2007 northern hemisphere summer it observed the entire OH and PMC diurnal
cycle. SHIMMER observed hundreds of PMCs in 2007 between 50-58° N. These data complement the PMC
data from NASA's Aeronomy of Ice in the Mesosphere (AIM) mission, which are made near local noon. We will
compare the SHIMMER PMC frequencies at local noon to those from the Cloud Imaging and Particle Size (CIPS)
instrument on AIM. Using the seasonal PMC dependence observed by CIPS, we will infer the local time
dependence on PMC frequency for the 2007 NH summer from the SHIMMER observations. We will then consider
the implications to long term PMC trends as applied to satellite observations that vary slowly in local time from
year to year.
DE: 0319 Cloud optics
DE: 0320 Cloud physics and chemistry
DE: 0341 Middle atmosphere: constituent transport and chemistry (3334)
DE: 3311 Clouds and aerosols
SC: SPA-Aeronomy [SA]
MN: 2007 Fall Meeting