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CloudNet: TARA status and database

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RAW data 1 ms sweeps. 0.512 sec moments of Doppler spectrum Z, V, W ... 5 x 1-msec sweeps sequence: B0HH B0HV B0VV B1 B2. repeats N times to form ... – PowerPoint PPT presentation

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Title: CloudNet: TARA status and database


1
CloudNetTARA status and database
  • H. Russchenberg , O. Krasnov Delft University of
    Technology IRCTR, The Netherlands

2
TARA current status
  • It is working
  • Starting August 18, 2004

1 hour
1 hour
1 min
1 min
1 min
RAW data 1 ms sweeps
0.512 sec moments of Doppler spectrum Z, V,
WCalibrated, net CDF format
Range resolution 30 m Doppler velocity 22
m/sec
CLOUDNET product 30 sec averaged Z,V,W
dataafter application cloud mask
3
3D wind mode for TARA
B0 - Fullpolarimetrybeam
November - December 2004, first experimental
campaign
B1 - One polarizationbeam
15
5 x 1-msec sweeps sequence B0HH B0HV B0VV
B1 B2 repeats N times to formDoppler spectra
in all channels
15
B2 - One polarizationbeam
  • Output
  • Standard products as it is now
  • 3D wind field
  • Polarimetric information

4
TARA database status
2002
2003
2004
2005
January
January
31
February
February
4...
March
March

April
April

May
May

June
June

July
July

August
August

September
25
September

October
3
October

November
27
November

December

Total
298
Total
34(?)
On KNMI CloudNet FTP server
5
LWC retrievals using radar - lidar algorithm
  • NetCDF
  • YYYYMMDD_site_LWC_Radar_lidar_method.nc
  • Common variables - time, height, latitude,
    longitude, altitude, radar frequency, global
    attributes.
  • 2D arrays
  • optical extinction,
  • radar reflectivity to optical extinction ratio
  • Time series of lidars optical depth
  • Retrievals
  • Used for retrieval Z/? and Z thresholds,
  • 2D liquid water categorization map and LWC array,
  • time series of retrieved LWP (for the different
    Z-LWC relations)

6
  • liquid_water_map_bits
  • Bit 0 - Reading's categorization product
    recognized pixel as water ((small droplets OR
    water precipitation) AND Temperature gt 0C)
  • Bit 1 - radar signal presented
  • Bit 2 - lidar signal (extinction) presented
  • Bit 3 - radar reflectivity to lidar extinction
    presented
  • Bit 4 - atmospheric water, class 1 - "water cloud
    without drizzle"
  • Bit 5 - atmospheric water, class 2 - "water cloud
    with light drizzle"
  • Bit 6 - atmospheric water, class 3 - "water cloud
    with heavy drizzle"

7
May 19, 2003, Cabauw
8
May 19, 2003, Cabauw
9
May 19, 2003, Cabauw
10
May 19, 2003, Cabauw
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