[Source: "Level 2 Radar-Lidar GEOPROF Product VERSION 0 - Draft Process Description and Interface Control Document"]
The Cloudsat cloud profiling radar (CPR) and the Calipso Cloud-Aerosol Lidar with
Orthogonal Polarization (CALIOP; hereafter referred as the Lidar) are slated to fly in
close coordination with one another when on orbit ... within the Aqua MODIS swath. The
obvious synergy of this combined observational capability is significant. With the ability
of the CPR to probe optically thick large-particle layers and the ability of the Lidar to
sense optically thin layers and tenuous cloud tops, the two instruments have the potential
of providing as complete a picture of the occurrence of cloud and aerosol as has been
compiled to date. However, not only do the two instruments sense the atmosphere in
different ways, the macroscopic characteristics of the observations such as vertical
resolution, spatial resolution, and spatial frequency are quite different from one another.
The pointing certainty of the two instruments also adds complexity to combining the two
data streams. Our goal is to optimally merge these two data streams in order to produce
the most accurate quantitative description of the location of hydrometeor layers in the
atmosphere that is possible. Beyond this primary goal, we will also attempt to extract
from the combined data streams the degree to which the volumes illuminated by the
cloudsat CPR are fully or partially filled by hydrometeors.
This document describes the algorithm that will be implemented operationally to
combine the CPR and Lidar data cloudmasks to meet the goals described above. This
- Identify the hydrometeor layer base and top heights for up to five layers in each
vertical CPR profile.
- Estimate the degree to which each radar resolution volume is cloud filled.
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