1. Cloudnet Workshop 4-5 Apr 2005 - Martial Haeffelin
SIRTA Cloud and Radiation Observatory
Institut Pierre Simon Laplace
Cloud Occurrence
M. Haeffelin, A. Armstrong, L. Barthès, O. Bock, C. Boitel, D. Bouniol, M. Chiriaco, J. Delanoe, P. Drobinski, J-L. Dufresne, C. Flamant, M. Grall, F. Hourdin, F. Lapouge, Y. Lemaître, A. Mathieu, Y. Morille, V. Noel, J. Pelon, C. Pietras, A. Protat, B. Romand, G. Scialom, R. Vautard, Y. Wanherdrick
Cloudnet Workshop 4-5 Apr Martial Haeffelin

2. Analysis of Radar + Lidar Data
Lidar STRAT (IPSL)
Radar/ceilometer classification (U. Reading)
Radar+Lidar cloud mask (IPSL)
Cloudnet Workshop 4-5 Apr Martial Haeffelin

3. Radar and lidar monthly hours of data
No ceilometer
Maintenance
24-7
Inter-calibration
Palaiseau 10/ /2004
Cloudnet Workshop 4-5 Apr Martial Haeffelin

4. Hourly-mean Cloud Products
Processed Radar + Lidar data: 10/ /2004
Cloud, aerosol, BLH mask
Time averaged data CF
Tt Lo Mi Hi
Range
Min Max Avg
CLD Layer1
CBH CTH CF
CLD Layer2
CBH CTH CF
Cloudnet Workshop 4-5 Apr Martial Haeffelin

5. Cloud Product Dataset Analysis
Frequency of occurrence of single and multiple cloud layers
Radar + Lidar
ML = 40%
Radar + Lidar
Frequency of occurrence of cloud thickness and vertical distribution
Low: 0-3km
Mid: 3-7 km
High: >7km
Cloudnet Workshop 4-5 Apr Martial Haeffelin
Palaiseau 10/ /2004

6. Cloudnet Workshop 4-5 Apr 2005 - Martial Haeffelin
Occurrence of CBH + CTH
Cloudnet Workshop 4-5 Apr Martial Haeffelin

7. Vertical Profile of Cloud Occurrence
Based on 1-hr means - Occurrence wrt time
Cloudnet Workshop 4-5 Apr Martial Haeffelin

8. Vertical Profile of Cloud Occurrence
Based on 1-hr means - weighted by Cloud Fraction
Cloudnet Workshop 4-5 Apr Martial Haeffelin

9. Vertical Profile of Cloud Occurrence
Based on 1-hr means - Occurrence wrt cloudy pixels
Cloudnet Workshop 4-5 Apr Martial Haeffelin

10. Cloudnet Workshop 4-5 Apr 2005 - Martial Haeffelin
Further analysis:
For low clouds (0<CBH<3km):
Height/length ratio depending on thermodynamic state
For mid-altitude clouds (3<CBH<7km):
Vertical development of mid-altitude clouds
For high-altitude clouds (CBH>7km):
Occurrence of jet vs front cirrus clouds
Cloudnet Workshop 4-5 Apr Martial Haeffelin