CALIPSO/CLOUDSAT Vertical Cloud Caracterization

Version history:

Version 2.1.1: algorithm version 2.1.1, Brown and Francis modified mass-size relationship, DARDAR-MASK version 1.1.4, CLOUDSAT Level 1 and 2 R03, CALIOP Level 1 and 2 versions 3.x, IIR L1 versions 1-0x, Released July 2019
Version 3-00: algorithm version 3.0.1, Brown and Francis modified mass-size relationship, CLOUDSAT Level 1 and 2 R05, CALIOP Level 1 versions 4.1x and level 2 versions 4.2x, IIR L1 versions 2-0x, Released June 2021
Version 3-10: algorithm version 3.0.1, Heymfield's composite mass-size relationship, CLOUDSAT Level 1 and 2 R05, CALIOP Level 1 versions 4.1x and level 2 versions 4.2x, IIR L1 versions 2-0x, Released June 2021

File description: DARDAR-CLOUD


Product file format: NetCDF4

Product datasets

Dataset DataType Dimensions units valid_range scale_factor add_offset _FillValue Missing_Output long_name
bscat_fwd float32 [?,
?]		 m-1 sr-1 [ 1.00000001e-07 9.99999975e-05] NONE NONE [-999.] NONE Lidar total attenuated backscatter at 532nm foward model
ln_iwc_error float32 [?,
?]		 1 [ 0. 0.60000002] NONE NONE [-999.] NONE Fractional error in IWC
wavelength float32 [?] m [ 7.99999998e-06 1.40000002e-05] NONE NONE NONE NONE Wavelength of the centre of radiance channel (infrared)
vis_optical_depth float32 [?] 1 [ 0. 50.] NONE NONE [-999.] NONE Optical Thickness forward model
ln_N0_error float32 [?,
?]		 1 [ 0. 0.60000002] NONE NONE [-999.] NONE Fractional error in normalized number concentration parameter
n_iterations int16 [?] 1 [ 0 20] NONE NONE [-999] NONE Number of iteration to converge
time float32 [?] seconds since 2019 01 01 00:00:00 UTC [ 0. 8000.] NONE NONE NONE NONE UTC time
bscat_perp float32 [?,
?]		 m-1 sr-1 [ 1.00000001e-07 9.99999975e-05] NONE NONE [-999.] NONE Lidar perpendicular attenuated backscatter at 532nm
ln_extinction_error float32 [?,
?]		 1 [ 0. 0.60000002] NONE NONE [-999.] NONE Fractional error in visible extinction coefficient
surf_emissivity1 float32 [?] 1 [ 0. 1.] NONE NONE [-999.] NONE Surface emissivity 1
vis_optical_depth_error float32 [?] 1 [ 0. 50.] NONE NONE [-999.] NONE Error in optical thickness forward model
longitude float32 [?] degrees_east [-180. 180.] NONE NONE [-999.] NONE longitude
latitude float32 [?] degrees_north [-90. 90.] NONE NONE [-999.] NONE latitude
bscat float32 [?,
?]		 m-1 sr-1 [ 1.00000001e-07 9.99999975e-05] NONE NONE [-999.] NONE Lidar total attenuated backscatter at 532nm
radiance float32 [?,
?]		 W m-2 um-1 sr-1 [ 0. 15.] NONE NONE [-999.] NONE Radiance Forward model
Z_fwd float32 [?,
?]		 mm6 m-3 [ 9.99999975e-05 1.00000000e+02] NONE NONE [-999.] NONE Radar reflectivity foward model
chi2_dim float32 [?] NONE NONE NONE NONE NONE NONE NONE
sea_surface_temperature float32 [?] K [ 273. 300.] NONE NONE [-999.] NONE Sea surface temperature from ECMWF model
u10_velocity float32 [?] m.s-1 [-200. 200.] NONE NONE [-999.] NONE Ten-meter U component of wind from ECMWF model
N0star float32 [?,
?]		 m-4 [ 1.00000000e+04 9.99999996e+11] NONE NONE [-999.] NONE Retrieved normalized number concentration parameter
iwc float32 [?,
?]		 kg m-3 [ 1.00000001e-07 9.99999975e-05] NONE NONE [-999.] NONE Retrieved Ice Water Content
land_water_mask int16 [?] 1 [0 7] NONE NONE [-999] NONE Land Water Mask from Calipso
chi2_split_dim float32 [?] NONE NONE NONE NONE NONE NONE NONE
chi2_split float32 [?,
?]		 1 [ 1.00000000e+09 0.00000000e+00] NONE NONE [ 1.00000000e+09] NONE Value of chi squared at final iteration for each instrument lidar mie, lidar ray, Z, radiance, dradiance), normalized by the number of gates
v10_velocity float32 [?] m.s-1 [-200. 200.] NONE NONE [-999.] NONE Ten-meter V component of wind from ECMWF model
temperature float32 [?,
?]		 K [ 0. 400.] NONE NONE [-999.] NONE Temperature from ECMWF
Target_Lidar_Mask int16 [?,
?]		 1 [-1 9] NONE NONE [-9] NONE Type of target identified by the LIDAR
radiance_difference_flag int16 [?,
?]		 1 [0 3] NONE NONE [-999] NONE Radiance difference flag
day_night_flag int16 [?] 1 [0 1] NONE NONE [-999] NONE Day Night Flag from lidar
ln_effective_radius_error float32 [?,
?]		 1 [ 0. 0.60000002] NONE NONE [-999.] NONE Fractional error in effective radius
DARMASK_Simplified_Categorization int16 [?,
?]		 1 [-2 15] NONE NONE [-9] NONE DARMASK Categorization Flags
radiance_flag int16 [?,
?]		 1 [0 1] NONE NONE [-999] NONE Radiance flag
height float32 [?] m [ 0. 30000.] NONE NONE NONE NONE height
extinction float32 [?,
?]		 m-1 [ 1.00000001e-07 1.00000001e-01] NONE NONE [-999.] NONE Retrieved visible extinction coefficient
radiance_sat float32 [?,
?]		 W m-2 um-1 sr-1 [ 0. 15.] NONE NONE [-999.] NONE Radiance the satellite (3 channels)
u_velocity float32 [?,
?]		 m.s-1 [-200. 200.] NONE NONE [-999.] NONE U component of wind from ECMWF model, interpolated on DARDAR heights
effective_radius float32 [?,
?]		 m [ 0. 0.00015] NONE NONE [-999.] NONE Retrieved effective radius
instrument_flag int16 [?,
?]		 1 [0 3] NONE NONE [-999] NONE Instrument flag
ln_lidar_ratio_error float32 [?,
?]		 1 [ 0. 0.60000002] NONE NONE [-999.] NONE Fractional error in extinction-to-backscatter ratio
Tropopause_Height float32 [?] m [ 0. 25000.] NONE NONE [-Inf] NONE Tropopause Height from CAL_LID_L1, averaged on the RADAR spot
lidar_ratio float32 [?,
?]		 sr [ 0. 100.] NONE NONE [-999.] NONE Retrieved extinction-to-backscatter ratio
surf_emissivity0 float32 [?] 1 [ 0. 1.] NONE NONE [-999.] NONE Surface emissivity 0
chi2 float32 [?,
?]		 1 [ 1.00000000e+09 0.00000000e+00] NONE NONE [ 1.00000000e+09] NONE Value of chi squared for each iteration
v_velocity float32 [?,
?]		 m.s-1 [-200. 200.] NONE NONE [-999.] NONE V component of wind from ECMWF model, interpolated on DARDAR heights
Z float32 [?,
?]		 mm6 m-3 [ 9.99999975e-05 1.00000000e+02] NONE NONE [-999.] NONE Radar reflectivity factor



Product global attributes

Global attribute DataType Dimensions Value
end_acquisition_date string 1 2019-01-01T00:55:40Z
software_version string 1 3.0.1
beginning_acquisition_date string 1 2019-01-01T00:55:40Z
input_files string 1 DARDAR-MASK_2019001005530_67526_V2-23.nc
production_center string 1 AERIS/ICARE Data and Services Center
geographic_projection string 1 CLOUDSAT Track
production_date string 1 2021-07-11T00:11:01
product_version string 1 V3-00
institution string 1 Science Protoype:
University of Reading, UK: http://www.met.reading.ac.uk
LATMOS, FR: https://www.latmos.ipsl.fr
Operational Version:
AERIS/ICARE Data and Services Center, FR: https://www.icare.univ-lille.fr
contact string 1 icare-contact@univ-lille.fr
sensors string 1 CLOUDSAT, CALIOP, CALIPSO IIR, MODIS, ECMWF
horizontal_resolution string 1 CLOUDSAT track
doi string 1 TBD
source string 1 satellite observation
title string 1 Varcloud - Optimal estimation ice cloud retrieval method
product_name string 1 DARDAR-CLOUD
comment string 1
Conventions string 1 CF-1.7
file_name string 1 DARDAR-CLOUD_2019001005530_67526_V3-00.nc
history string 1 Sun Jul 11 00:11:01 2021 - Generated by variational algorithm by production on icare45
This Retrieval has been derived from : [Radar reflectivity] [Lidar]
Formalism: N0* and N0prime=N0/alpha^coeff
Lookup table: /usr/exploit/production/chaines/dardar_cloud/dardar_cloud.3.0.1/LUT/ice_properties_TMatrix_axial_ratio_0_6_BF95_modified_-1_3_cloudsat.cfg
Input file: /DATA/LIENS/CLOUDSAT/DARDAR-MASK.v2.23/2019/2019_01_01/DARDAR-MASK_2019001005530_67526_V2-23.nc
-----------------------------------------
Check configuration parameters :
Configuration for Extinction to backscatter ratio: S constant (0), lnS linear vert (1), S linear vert (2), S tanh vert (3), basis functions (4), full resolution (5), lnS linear temperature (6) :6
N spacing factor :4
Extinction to backscatter ratio spacing factor :4
ln(Extinction to backscatter ratio), first guess :10.0000
ln(Extinction to backscatter ratio ice), first guess 1 :3.5000
ln(Extinction to backscatter ratio ice), first guess 2 :0.0000
ln(Extinction to backscatter ratio ice), apriori 1 :3.1800
ln(Extinction to backscatter ratio ice), apriori 2 :-0.0086
ln(Extinction to backscatter ratio ice), apriori error 1 :0.1000
ln(Extinction to backscatter ratio ice), apriori error 2 :0.0001
Radius A, first guess :1e-05
ln(Extinction), first guess :-9.00
Smoothscale :1.00
Use molecular signal beyond the cloud (1) otherwise (0) :1
No lidar exploited beyond liquid ...(1) otherwise (0) :1
Diagonal value in a priori errcov :1.00
A priori decorrelation distance :10.00
Z error value in dBZ (forward model):1.00
Beta error value in ln (forward model):0.30
IR MODIS AQUA(1),IIR(2),SEVERI MSG(3),EARTHCARE MSI(4) :1
Error covariance used, yes (1) no (0) :1
Number of molecular gates used beyond the cloud :5
Nprime a priori as function of Temperature [deg C] (default_logNprime = ln(N0*/extinction^coeff) = A +B*T)
A for Nprime:22.234434
B for Nprime:-0.090736
Nprime coefficient:0.610000
HSRL used ...(1) otherwise (0) :0
IR Wavelength assimilated (micron):11.03
dI=I1-I2
IR (1) Wavelength assimilated for radiance difference (micron):8.55
IR (2) Wavelength assimilated for radiance difference (micron):12.02
references string 1 https://www.icare.univ-lille.fr/dardar
vertical_bin_size string 1 60 m

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