1. Radar-lidar synergy for the retrieval of water cloud parameters
Herman Russchenberg, Oleg Krasnov
February 25, 2019
International Research Centre for Telecommunication and Radar

2. Ground based observations
radar
lidar
radiometry
February 25, 2019

3. Dropsize distribution Very sensitive to tail of dsd
Are power laws useful?
Dropsize distribution
Very sensitive to tail of dsd
February 25, 2019

4. Common opinion: No, there is too much scatter due to drizzle
unless
we can identify the drizzle droplets somehow...
February 25, 2019

5. drizzle “transition” drizzle non-drizzling
A million droplets of 10 micron
give the same radar reflection as
one droplet of 100 micron!
A million droplets of 10 micron contain
a thousand times as much water
as one one droplet of 100 micron...
And so: one drizzle droplet changes the
reflectivity significantly without changing
the liquid water content
non-drizzling
February 25, 2019

6. Radar reflection Drizzling Non-drizzling Coarse classification
February 25, 2019

7. Radar and lidar observables in relation to microphysics of water clouds
Radar-lidar ratio vs effective radius
Radar reflectivity vs liquid water content
February 25, 2019

8. Example: June 19, 2003, Chilbolton
February 25, 2019

9. February 25, 2019

10. February 25, 2019

11. Statistics of cloud types, Cabauw
7.9 %
27.1 %
65.0 %
February 25, 2019

12. Statistics of cloud types, Chilbolton
9.3 %
29.3 %
61.4 %
February 25, 2019

13. Statistics of cloud types, Palaiseau
8.7 %
27.8 %
63.5 %
February 25, 2019

14. Statistics of cloud types, all sites
8.7 %
27.8 %
63.5 %
-35 dBZ
-20 dBZ
February 25, 2019

15. Climatology or calibration?
Site-specific thresholds
Averaged CloudNet thresholds
February 25, 2019

16. February 25, 2019

17. After filtration out values of both LWP > 400 g/m^2
The difference between the radar/lidar LWP retrievals and microwave radiometer
After filtration out values of both LWP > 400 g/m^2
February 25, 2019

18. The comparative statistic for the Cloudnet LWP datasets
February 25, 2019

19. observations
February 25, 2019

20. The difference between the Radar/lidar retrievals and ECMWF NWPM LWP
After filtration out values of both LWP > 400 g/m^2
February 25, 2019

21. February 25, 2019

22. Outlook Refine statistics Refine thresholds Application to ARM data
Apply to CloudSat – Calipso
Combine with IPT
February 25, 2019