Physics – Geophysics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa41a1588c&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA41A-1588
Physics
Geophysics
[3275] Mathematical Geophysics / Uncertainty Quantification
Scientific paper
The Cloud Imaging and Particle Size (CIPS) experiment on the Aeronomy of Ice in the Mesosphere (AIM) satellite is a nadir imager with an approximately 2000 km along track by 1000 km cross track field of view. CIPS observes at the UV wavelength of 265nm with a spatial resolution of 1km by 2km. One of the key goals for CIPS is to determine Polar Mesospheric Cloud (PMC) ice particle sizes. We will present a component analysis of the information content of the scattering “profile” as measured by the CIPS. The scattering “profile” is the approximately 7 albedo measurements obtained by CIPS as AIM passes over each cloud parcel. These are each made at different viewing geometries and thus over a range of scattering angles. The scattering profile is composed of a Rayleigh background signal and a PMC ice phase function signal. The Rayleigh albedo is controlled by the ozone column density above ~50km as well as the vertical ozone structure in this region. The PMC particle size information is in the PMC phase function. In order to isolate the PMC phase function, we must remove the Rayleigh background albedo. We will attempt to quantify the degree to which this decomposition is unique and how errors in retrieved ozone parameters which determine the Rayleigh background can translate into errors in the retrieved PMC particle size determined from the phase function. A key result is that a large component of the PMC signal can be described in terms of a Rayleigh-like background signal. The principal (but not only) difference between the PMC signals for differing particle sizes is the relative amount (or power) of this Rayleigh-like component in the PMC signal. This means that an error in the amount of Rayleigh background signal removed will translate almost directly into an error in retrieved particle size.
Bailey Scott M.
Carstens Justin N.
Lumpe J. D.
Randall Cora E.
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