Airborne Mobile Aerosol Lidar AMALi

1
Airborne Mobile Aerosol Lidar AMALi

• ASTAR 2007
• Astrid Richter1, Roland Neuber1, Anne Hoffmann1,
  Christoph Ritter1, Andreas Herber1, Iwona
  Stachlewska2
• 1Alfred Wegener Institute for Polar and Marine
  Research, Potsdam, Germany
• 2Leosphere, Lidar Environmental Observations,
  Orsay, France

2
Data provided by AMALi

• aerosol backscatter lidar
• backscatter coefficient at 532 355 nm
  simultaneously
• depolarisation measurement at 532 nm
• vertical resolution 7.5 m
• horizontal resolution gt 4.5 km
• (depending on ground speed of aircraft)

3
AMALi in Polar 2

• Zenith configuration
• altitude range
• up to 9 km above aircraft

• Nadir configuration
• altitude range
• surface flight level
• (max. 10000 ft)

4
AMALi set up in Polar 2
4
nadir
zenith
1
2
3

• Optics Unit
• Laser Controller
• Data Acquisition
• Laptop

• Optics Unit
• Laser Controller
• Data Acquisition
• Laser beam protection

5
AMALi specs
6
AMALi applications

• ASTAR 2004 2006
• vertical horizontal distribution of Arctic
  aerosol
• pathfinder for Polar 4 / Falcon in-situ
  measurements
• combination of remote and in-situ data

7
AMALi fligths during ASTAR 2007
8
Examples of ASTAR 2007 Comparison with CALIPSO
9th April 2007 Flight along CALIPSO track Nadir
configuration
9
9th April 2007, nadir configuration AMALi -
Backscatter 532 nm
height
time
Example of ASTAR 2007 Flight along CALIPSO
track AMALi screen shots, preliminary data!
10
Examples of ASTAR 2007 Combined remote/in situ
measurements
AMALi in zenith looking configuration Detection
of thin midlevel cloud (2500 m above aircraft) In
situ measurements of cloud particle properties
11
10th April 2007, zenith configuration AMALi -
Backscatter 532 nm
Example of ASTAR 2007 combined remote/in situ
measurements AMALi screen shots, preliminary data!
12
10th April 2007, zenith configuration AMALi -
Backscatter 355 nm
Example of ASTAR 2007 combined remote/in situ
measurements AMALi screen shots, preliminary data!
13
10th April 2007, zenith configuration AMALi -
Depolarisation
Flight altitude (1000 ft)
Example of ASTAR 2007 combined remote/in situ
measurements AMALi screen shots, preliminary data!
14
AMALi Summary

• Airborne backscatter lidar
• Range surface 3 km / flight altitude 9 km
• Detection of clouds, haze layers
• Analysis with
• 2 colours,
• depolarisation

15

• Thanks to all the ASTAR team!

for further questions related to AMALi
Astrid.Richter_at_awi.de
16
AMALi - Optics unit
first version
new version
22
21
1. laser, 2. mirror, 3. window with Brewsters
angle, 4. offaxis parabolic mirror, 5. first
folding mirror, 6. pinhole, 7. second folding
mirror, 8. achromatic lens, 9. Beam splitter,
10. interference filter for 1064 nm channel, 11.
APD 1064 nm detection, 12. interference filter
for 532 nm channel, 13. polarising cube, 14.
thin film polarising filter, 15. PMT 532 nm
detection, 16. PMT II 532 nm detection, 17.
optical bench, 18. springs, 19. posts, 20.base
plate. 21.interference filter for 355 nm
channel22. PMT 355 nm detection
Emission and detection of 1064 nm now
replaced by 355 nm
17
Other lidar system ASTAR 2007EZ lidar,
Longyearbyen
EZ lidar, Leosphere
Backscatter profiles at 355 nm