Remote-sensing of the environment (RSE) ATMOS Analysis of the Composition of Clouds with Extended...
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Remote-sensing of the environment (RSE) ATMOS Analysis of the Composition of Clouds with Extended Polarization Techniques L. Pfitzenmaier, H. Russchenbergs
Remote-sensing of the environment (RSE) ATMOS Analysis of the
Composition of Clouds with Extended Polarization Techniques L.
Pfitzenmaier, H. Russchenbergs group (TU Delft) TROPOS, Germany
KNMI METEK, Germany
Slide 2
ATMOS Delft University of Technology 2 Remote-sensing of the
environment (RSE) Ice particle within mixed-phase clouds growth
processes(L. Pfitzenmaier, TU Delft) shape categorisation(A.
Myagkov, TROPOS, Germany) Why? Process important for precipitation
formation Gap between theory and observations of those
processes/clouds Improve mixed-phase cloud observations Measuring
in Cabauw Motivation < 0 C > 0 C
Slide 3
ATMOS Delft University of Technology 3 Remote-sensing of the
environment (RSE) Ice crystals Shape: not spherical Pristine ice
crystals Aggregates Graupel Phase: solid Size: mm cm Lower
concentration < 100 cm -3 Super cooled cloud droplets Shape:
spherical Phase: Liquid Size: ~ 10 mm High concentration 100 1000
cm -3 Microphysical description of mixed-phase clouds Liquid phase
& ice crystals Mixed phase clouds: Mid-level clouds (~3 7 km)
-40 C < Temperature < 0
Slide 4
ATMOS Delft University of Technology 4 Remote-sensing of the
environment (RSE) Ice crystals Shape: not spherical Pristine ice
crystals Aggregates Graupel Phase: solid Size: mm cm Lower
concentration < 100 cm -3 Super cooled cloud droplets Shape:
spherical Phase: Liquid Size: ~ 10 mm High concentration 100 1000
cm -3 Microphysical description of mixed-phase clouds Liquid phase
& ice crystals Mixed phase clouds: Mid-level clouds (~3 7 km)
-40 C < Temperature < 0 Synergy of instruments to measure the
whole cloud system
Slide 5
ATMOS Delft University of Technology 5 Remote-sensing of the
environment (RSE) Why Cabauw..? Instrumentation at Cabauw: TARA ice
phase & growth categorization processes CAELI liquid layer
detection Cloud radar ice and liquid Radiometer liquid layer Wind
profiler vertical dynamic (Doppler spectra?)
Slide 6
ATMOS Delft University of Technology 6 Remote-sensing of the
environment (RSE) Transportable Atmospheric Radar TARA S-band
profiler: f=3.298 GHz, =9.09 cm (Rayleigh-scattering) Fully
polarimetric Shape/orientation of particles Doppler capability
Velocity of hydrometeors High temporal (> 3.5 s) and spatial
resolution (> 3 m) small scale processes Sensitive to large
hydrometeors (size) Precipitation (drizzle, rain, snow, hail) Ice
crystals NOT TO CLOUD DROPLETS (~10 m) Direct measurement of the
ice phase Use of a second instrument to get information about the
liquid phase
Slide 7
ATMOS Delft University of Technology 7 Remote-sensing of the
environment (RSE) CESAR cloud, aerosol, and water vapour liadr -
CAELLI 3 wavelength Raman lidar 1064 nm, 532 nm, 355nm 2 Raman
channels: 387 nm and 607 nm Water vapor channel 407 nm
Depolarization channel 532 nm extinction coefficient backscatter
coefficient depolarization ratio High special resolution (7.5 m)
Sensitive to small particles Aersols Cloud droplets Information
about liquid water layers within mixed phase clouds
Slide 8
ATMOS Delft University of Technology 8 Remote-sensing of the
environment (RSE) Raman Lidar CAELI Sensitive to particle
concentration Radar TARA Sensitive to particle size Measurement set
up Cabauw : extinction coefficient n(r) : droplet number
concentration r : droplet radius Z : reflectivity Donovan and
Lammeren, 2001 Y. Dufournet PhD Thesis Microwave radiometer Gives
values of the liquid water path (LWP) the amount of liquid water
present in the cloud system
Slide 9
ATMOS Delft University of Technology 9 Remote-sensing of the
environment (RSE) Why Cabauw..? Instrumentation at Cabauw: TARA ice
phase & growth categorization processes CAELI liquid layer
detection Cloud radar ice and liquid Radiometer liquid layer Wind
profiler vertical dynamic (Doppler spectra?) LACROS (Leipzig
Aerosol and Cloud Observations System) More information on the
liquid phase Founded by ACTRIS-TNA and TROPOS More instruments
needed
Slide 10
ATMOS Delft University of Technology 10 Remote-sensing of the
environment (RSE) Leipzig Aerosol and Cloud Observations System -
LACROS Cloud radar Mira 35 STAR mode scanning shape categorization
of ice particles scanning strategy liquid phase information
Microwave radiometer liquid phase information Ceilometer Cloud base
Distrometer Rain droplet sizes Raman lidar PollyXT (of zenith
pointing) liquid layer detection runs automatically 24/7 Doppler
lidar analyze the dynamic at cloud base Cloud radar Mira35 vertical
pointing Comparison with other radars Radiosounds Aircraft...? TARA
Caeli MWR Doppler- lidar LACROS Mira35
Slide 11
ATMOS Delft University of Technology 11 Remote-sensing of the
environment (RSE) Goals of ACCEPT Categorization of the ice phase
in mixed-phase clouds characterize of ice particle growth processes
testing the Mira35 STAR mode radar Comparison of radar measurements
comparison of particle shape measurements TARA and Mira35-STAR mode
sensitivity studies Cloud measurements with CAELI compare with
Polly XT measurements Creating a data set where also other studies
could be done Open data base More about scientific work Poster
Slide 12
Remote-sensing of the environment (RSE) ATMOS TARA S-band
precipitation radar CAELI Raman lidar Wind profiler Cloud radar -
KNMI Mira35 STAR mode cloud radar Mira35 LDA mode cloud radar
PollyXT Raman lidar Doppler lidar Microwave radiometer Distrometer
Ceilometer Radiosounds date: 6-10 16-11-2014 Information about
campaign: http://atmos.weblog.tudelft.nl open data base o more
radiosounds? o Interested...? Contact us [email protected][email protected]