January 13, 2009

Comparisons Radar/Lidar data

Comparisons with ARM-SGP Radar/Lidar data

Cloud Rayleigh Pressure

POLDER-2 Rayleigh pressure versus cloud top pressure deduced from
ARM-SGP (Atmospheric Radiation Measurement, Southern Great Plains)
Radar/Lidar measurements (data provided by R.T. Marchand).

Rayleigh pressure appears close to the cloud top pressure for high clouds,
it seems too weak (~ 200 hPa) for low clouds.

Cloud Oxygen Pressure

POLDER-2 Oxygen pressure versus mean cloud pressure deduced
from ARM-SGP Radar/Lidar measurements.

Oxygen pressure appears very close (~ 50 hPa) to the mean cloud pressure.

Comparisons with Cloudnet-SIRTA Radar/Lidar data

Cloud Rayleigh Altitude

Comparison of POLDER-2 Rayleigh altitude (obtained from Rayleigh pressure
and radiosoundings) and cloud top altitude deduced from CloudNet-SIRTA measurements.
Red dots are for radar and lidar combined measurements,
blue dots for lidar-only retrievals and black dots for radar-only retrievals.

Rayleigh pressure is weaker than cloud top pressure deduced from SIRTA measurements
(~ 50 hPa for low clouds to 200 hPa for low clouds).

Cloud Oxygen Altitude

Comparison of POLDER-2 Oxygen altitude (obtained from Oxygen pressure
and radiosoundings) and mean cloud altitude deduced from CloudNet-SIRTA measurements.
Red dots are for radar and lidar combined measurements and
blue dots for lidar-only retrievals.