Cloudnet Workshop 4-5 Apr 2005 - Martial Haeffelin

SIRTA Cloud and Radiation ObservatorySIRTA Cloud and Radiation Observatory

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

Institut Pierre Simon LaplaceInstitut Pierre Simon Laplace

Cloud OccurrenceCloud Occurrence

Cloudnet Workshop 4-5 Apr 2005 - Martial Haeffelin

Lidar STRAT (IPSL)

Radar/ceilometer classification (U. Reading)

Radar+Lidar cloud mask (IPSL)

Analysis of Radar + Lidar DataAnalysis of Radar + Lidar Data

Cloudnet Workshop 4-5 Apr 2005 - Martial Haeffelin

Radar and lidar monthly hours of data Radar and lidar monthly hours of data

Palaiseau 10/2002-09/2004

No ceilometer Maintenance

24-7Inter-calibration

Cloudnet Workshop 4-5 Apr 2005 - Martial Haeffelin

Hourly-mean Cloud Products Hourly-mean Cloud Products

Processed Radar + Lidar data: 10/2002 - 09/2004

• Cloud, aerosol, BLH mask

• Time averaged data

20030527 7.0 000 000 000 000 10230 12120 11130 00000 00000 00020030527 8.0 016 016 000 000 10290 13545 11685 01695 01860 01620030527 9.0 100 100 000 063 09810 12720 11445 01620 01905 100 10635 11235 06420030527 10.0 090 060 013 055 02130 11145 07140 01545 01935 060 10380 11145 09220030527 11.0 026 000 000 026 01695 09270 07680 10155 10965 08420030527 12.0 098 080 002 028 01860 09180 05790 01260 01755 080 10020 10920 09720030527 13.0 077 077 000 000 01875 08325 04830 01350 01965 077 20030527 14.0 100 100 005 020 01920 08235 03360 01365 01965 100 10185 11010 07920030527 15.0 100 077 006 040 01920 09750 04815 01365 02010 077 09945 11010 09820030527 16.0 100 051 000 080 01995 10920 08085 01440 02010 051 08535 10890 09620030527 17.0 098 098 000 008 01995 10035 06945 01440 01950 098 10275 10830 05020030527 18.0 019 019 000 000 08505 11280 10065 01590 01905 019

CFTt Lo Mi Hi

RangeMin Max Avg

CLD Layer1CBH CTH CF

CLD Layer2CBH CTH CF

Cloudnet Workshop 4-5 Apr 2005 - Martial Haeffelin

Cloud Product Dataset Analysis Cloud Product Dataset Analysis

Palaiseau 10/2002-09/2004

Radar + Lidar

ML = 40%

Low: 0-3km

Mid: 3-7 km

High: >7km

Frequency of occurrence of single and multiple cloud layers

Radar + Lidar

Frequency of occurrence of cloud thickness and vertical distribution

Cloudnet Workshop 4-5 Apr 2005 - Martial Haeffelin

Occurrence of CBH + CTH Occurrence of CBH + CTH

Cloudnet Workshop 4-5 Apr 2005 - Martial Haeffelin

Based on 1-hr means - Occurrence wrt time

Vertical Profile of Cloud Occurrence Vertical Profile of Cloud Occurrence

Cloudnet Workshop 4-5 Apr 2005 - Martial Haeffelin

Based on 1-hr means - weighted by Cloud Fraction

Vertical Profile of Cloud Occurrence Vertical Profile of Cloud Occurrence

Cloudnet Workshop 4-5 Apr 2005 - Martial Haeffelin

Based on 1-hr means - Occurrence wrt cloudy pixels

Vertical Profile of Cloud Occurrence Vertical Profile of Cloud Occurrence

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