Ki-Ho Chang, Sung-Cheol Choi, Young-Min Noh, Dong-Oh Park, Miyoung Kang, Jin-Yim Jung,
and Back-Jo Kim
SOLETOP, NIMS/KMA
2
System
Laser(wavelength) Nd:YAG Laser(355 nm)
Detected wave355 nm (P/S), 387 nm(N2), 407 nm (H2O)
Pulse interval 20 Hz
Caliber of telescope 9.25 inch
Products
Depolarization ratio Classification of water/ice in cloud
Mixing ratio g/kg
Spec. of Cloud Lidar
< Simple Split method >(2012, patent registered)
< Cloud Lidar >
3
4000
6000
8000
10000
12000
1E-3 0.01 0.1 1
2003.04.03 (04:00)
Hei
ght (
m)
Aerosol Extinction Coefficient (/km)
0.0 0.1 0.2 0.3 0.4 0.5Depolarization Ratio
Cloud
Case of the cloud phase obs.(1/2)
v Cloud of Water droplets
4
2000
4000
6000
8000
10000
12000
1E-3 0.01 0.1
2003.03.19. (03:00)
Hei
ght (
m)
Aerosol Extinction Coefficient (/km)
0.0 0.1 0.2 0.3 0.4 0.5Depolarization Ratio
Cirrus Cloud
GIST
v Cloud of ice crystals
Case of the cloud phase obs.(2/2)
< Previous Products >German Meteorological Service – Ramanlidar for atmospheric moisture sensing(RAMSES) 2012
Case of the mixing ratio obs.
< Our observed Mixing ration (g/kg) >19:40 25 ~ 5:40 26 Oct. 2010
(10 min. interval)
22:00 4 - 6:30 5 Nov. 2016
S/W of Cloud Lidar
7
Spec. of 2DVD
Spec. of 2DVDMeasurement range
- Particle size 0.1 mm ~ 25 mm
- Particle velocity 0.5 m/s ~ 25 m/s
Transmitter Laser diode, 650 nm
Receiver (detector) Line scan camera
- Resolution 512 pixels
- Line rate 98 kHz
- Pixel size 14 um
Measuring area 50 cm2
< 2DVD >
8
Detecting Method of 2DVD
Beam width : 7 mm
Rainfall Chart
S/W of 2DVD: Rainfall Obs.
-1-
Summary
Cloud Lidar (prototype) provides reasonable results:
- Cloud Phase (water, ice) classification
- Mixing ratio
- Height of cloud base
- Needs the comparison studies by such as Ceilometer
2DVD (prototype) provides reasonable results:
- Falling velocity vs rainfall size
- Needs the observation and analysis for snowfall particles