Cloudnet Workshop 4-5 Apr Martial Haeffelin

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Presentation transcript:

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 2005 - Martial Haeffelin

Analysis of Radar + Lidar Data Lidar STRAT (IPSL) Radar/ceilometer classification (U. Reading) Radar+Lidar cloud mask (IPSL) Cloudnet Workshop 4-5 Apr 2005 - Martial Haeffelin

Radar and lidar monthly hours of data No ceilometer Maintenance 24-7 Inter-calibration Palaiseau 10/2002-09/2004 Cloudnet Workshop 4-5 Apr 2005 - Martial Haeffelin

Hourly-mean Cloud Products Processed Radar + Lidar data: 10/2002 - 09/2004 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 20030527 7.0 000 000 000 000 10230 12120 11130 00000 00000 000 20030527 8.0 016 016 000 000 10290 13545 11685 01695 01860 016 20030527 9.0 100 100 000 063 09810 12720 11445 01620 01905 100 10635 11235 064 20030527 10.0 090 060 013 055 02130 11145 07140 01545 01935 060 10380 11145 092 20030527 11.0 026 000 000 026 01695 09270 07680 10155 10965 084 20030527 12.0 098 080 002 028 01860 09180 05790 01260 01755 080 10020 10920 097 20030527 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 079 20030527 15.0 100 077 006 040 01920 09750 04815 01365 02010 077 09945 11010 098 20030527 16.0 100 051 000 080 01995 10920 08085 01440 02010 051 08535 10890 096 20030527 17.0 098 098 000 008 01995 10035 06945 01440 01950 098 10275 10830 050 20030527 18.0 019 019 000 000 08505 11280 10065 01590 01905 019 Cloudnet Workshop 4-5 Apr 2005 - Martial Haeffelin

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 2005 - Martial Haeffelin Palaiseau 10/2002-09/2004

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

Vertical Profile of Cloud Occurrence Based on 1-hr means - Occurrence wrt time Cloudnet Workshop 4-5 Apr 2005 - Martial Haeffelin

Vertical Profile of Cloud Occurrence Based on 1-hr means - weighted by Cloud Fraction Cloudnet Workshop 4-5 Apr 2005 - Martial Haeffelin

Vertical Profile of Cloud Occurrence Based on 1-hr means - Occurrence wrt cloudy pixels Cloudnet Workshop 4-5 Apr 2005 - Martial Haeffelin

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 2005 - Martial Haeffelin