Radar-lidar retrievals of water cloud parameters O. Krasnov, H. Russchenberg Delft University of Technology – IRCTR, The Netherlands

Radar-lidar technique Input vars Klett inversion Lidar (b) Z/a Radar (Z) -30 -20 -1 1.8 W.Clouds & Precipitation Categorization W.Cloud LWC=f1(Z) MWRM’s LWP L.Drizzle LWC=f2(Z) H.Drizzle LWC=f3(Z) Z Frisch retrievals Validation LWP(t) LWC(t,H)

The limitation in optical extinction retrievals

The Histogramms for Optical Extinction and Thickness May 19, 2003, Cabauw July 04, 2003, Chilbolton a < 5.7 10-3 1/m a < 8.3 10-3 1/m

Optical thickness from lidar’s profile Max optical extinction vs. Optical thickness May 19, 2003, Cabauw July 04, 2003, Chilbolton Optical thickness from lidar’s profile a < 5.7 10-3 1/m a < 8.3 10-3 1/m

The cloud classification The Reading’s «categorization» files

July 04, 2003, Chilbolton Reading’s classes in Z-a terms

July 04, 2003, Chilbolton All obserations

July 04, 2003, Chilbolton Class ICE

Class WATER = PRECIPITATION + WATER CLOUDS July 04, 2003, Chilbolton Class WATER = PRECIPITATION + WATER CLOUDS

July 04, 2003, Chilbolton Class PRECIPITATION

July 04, 2003, Chilbolton Class WATER CLOUDS

The Reading’s classification July 04, 2003, Chilbolton

The Delft’s classification July 04, 2003, Chilbolton

July 04, 2003, Chilbolton

July 05, 2003, Chilbolton

July 05, 2003, Chilbolton All obserations

July 05, 2003, Chilbolton Class ICE

Class WATER = PRECIPITATION + WATER CLOUDS July 05, 2003, Chilbolton Class WATER = PRECIPITATION + WATER CLOUDS

July 05, 2003, Chilbolton Class PRECIPITATION

July 05, 2003, Chilbolton Class WATER CLOUDS

The Reading’s classification July 05, 2003, Chilbolton

The Delft’s classification July 05, 2003, Chilbolton

July 05, 2003, Chilbolton

May 22, 2003, Cabauw

May 22, 2003, Cabauw All observations

May 22, 2003, Cabauw Class ICE

Class WATER = PRECIPITATION + WATER CLOUDS May 22, 2003, Cabauw Class WATER = PRECIPITATION + WATER CLOUDS

May 22, 2003, Cabauw Class PRECIPITATION

May 22, 2003, Cabauw Class WATER CLOUDS

The Reading’s classification May 22, 2003, Cabauw

The Delft’s classification May 22, 2003, Cabauw

May 22, 2003, Cabauw

The problem with «categorization» (?) or radiometer LWP retrievals (?)

LWC retrievals (Z/a)

May 02, 2003, Cabauw

May 09, 2003, Cabauw

May 19, 2003, Cabauw

May 19, 2003, 21.00 - 23.00 UTC Cabauw

May 19, 2003, 21.00 - 23.00 UTC Cabauw

May 21, 2003, 3.00 - 10.00 UTC Cabauw

May 21, 2003, 3.00 - 10.00 UTC Cabauw

July 04, 2003, Chilbolton

July 05, 2003, Chilbolton

MICCY, GKSS 95 GHz radar, Frisch method BBC-1, 05.09.2001, 9:42-10:42 MICCY, GKSS 95 GHz radar, Frisch method

Conclusions Database created The statistical analysis of the lidar inversions shows some limitations - instruments comparison, cross-calibration (?) The further development for clouds categorization technique is necessary (including Z/a ratio, cloud base height, water presence in ice regions) LWC retrievals Problems with poor water clouds still exist