Cloud Rayleigh Pressure: Consistency
Histogram of the difference between the surface pressure (Psurface)
and the Rayleigh pressure (Prayleigh). Results of the class 1 (old) algorithm
appear in blue when results for the class-2 (new) algorithm appear in red.
|The new (class-2) algorithm greatly reduces the number of pixels with too high values of Rayleigh pressure|
Cloud Rayleigh Pressure: Angular consistency
Mean Rayleigh pressure variation with the viewing angle.
The Rayleigh pressure parameter exhibits "strange" angular behaviour:
for viewing angles greater than 50°, the retrieved rayleigh pressure can be very different for pixels located West or East of the slot. This leads to discontinuities between two successive overlapping orbits (see red arrow).
|Those no-explained angular effects are specific to POLDER-2 measurements: they don't appear for POLDER-1 Rayleigh pressure whatever used algorithm (class-1 or class-2).|
© CNES Copyrights 2005