Computer Science – Sound
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa33b..05r&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA33B-05
Computer Science
Sound
[0340] Atmospheric Composition And Structure / Middle Atmosphere: Composition And Chemistry, [3311] Atmospheric Processes / Clouds And Aerosols, [3332] Atmospheric Processes / Mesospheric Dynamics, [3360] Atmospheric Processes / Remote Sensing
Scientific paper
We describe measurements of polar mesospheric clouds (PMCs) made by the Aeronomy of Ice in the Mesosphere (AIM) Cloud Imaging and Particle Size (CIPS) instrument. CIPS is a nadir-viewing, four-camera panoramic imager that measures scattering from the Earth’s atmosphere at 265 nm. Measurements presented here have a spatial resolution of 15x15 km and cover latitudes from 60 degrees to the pole in the summer hemisphere on each day. CIPS observations are interpreted in the context of measurements of water vapor and temperature from the NASA Microwave Limb Sounder (MLS) and Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument. In addition, the Navy Operational Global Atmospheric Prediction System (NOGAPS), into which MLS and SABER data are assimilated, is used to improve the sampling over that which is available from the MLS and SABER measurements alone. Results will be shown for the three northern hemisphere PMC seasons in 2007-2009, and for the two southern hemisphere seasons in 2007-2008 and 2008-2009. We will show that at the macroscopic scales relevant to the CIPS observations, PMCs are anti-correlated with temperature, but correlated with water vapor; this is consistent with water vapor responding to PMC formation, not controlling it. However, for a given temperature, PMCs are more likely to be present under conditions of higher water vapor. CIPS samples near noon and midnight on each orbit; we will thus also present an analysis of the diurnal variations in the observed PMCs.
Bailey Stephen
Benze Susanne
Harvey L.
Hoppel Karl
Lumpe J. D.
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