Details about parameters

This section describes special parameters in the DANRA dataset.

DANRA Parameters

DANRA output is ordered into three main categories based on the vertical levels of the data: surface or single level (SL), height levels (HL), and pressure levels (PL). Each category contains various meteorological parameters, which are described in detail below.

Single Levels

Single level parameters

Single level refers to parameters that are defined at a single vertical level in the atmosphere or at the surface.

Variable Name	CF Standard Name	Description	Unit
cape_column	atmosphere_convective_available_potential_energy_wrt_surface	CAPE out of the model	J kg-1
cb_column	cloud_base_altitude	Cloud base	m
ct_column	cloud_top_altitude	Cloud top	m
danra_projection
grpl_column	atmosphere_mass_content_of_graupel	Graupel	kg m-2
hcc0m	high_type_cloud_area_fraction	High cloud cover	1
icei0m		Icing index	-
lcc0m	low_type_cloud_area_fraction	Low cloud cover	1
lsm	land_binary_mask	Land cover (1=land, 0=sea)	1
lwavr0m		Long-wave radiation flux	W m-2
mcc0m	medium_type_cloud_area_fraction	Medium cloud cover	1
mld0m	atmosphere_boundary_layer_thickness	Mixed layer depth	m
orography		Geopotential	m2 s-2
pres0m	air_pressure	Pressure	Pa
pres_seasurface	air_pressure_at_mean_sea_level	Pressure	Pa
prtp0m		Precipitation Type	-
psct0m	brightness_temperature_at_cloud_top	Pseudo satellite image: cloud top temperature (infrared)	K
pscw0m		Pseudo satellite image: cloud water reflectivity (visible)	-
pstb0m		Pseudo satellite image: water vapour Tb	-
pstbc0m		Pseudo satellite image: water vapour Tb + correction for clouds	-
pwat_column	atmosphere_mass_content_of_water_vapor	Precipitable water	kg m-2
r2m	relative_humidity	Relative humidity	%
sf0m	snowfall_amount	Water equivalent of accumulated snow depth	kg m-2
swavr0m		Short-wave radiation flux	W m-2
t0m	air_temperature	Temperature	K
t2m	air_temperature	Temperature	K
tcc0m	cloud_area_fraction	Total cloud cover	1
u10m	x_wind	u-component of wind	m s-1
v10m	y_wind	v-component of wind	m s-1
vis0m	visibility_in_air	Visibility	m
xhail0m		AROME hail diagnostic	kg m-2

Height Levels

Height level parameters

Height level refers to parameters that are defined at specific vertical levels in the atmosphere.

Available height levels (meters):

30, 50, 75, 100, 150, 200, 250, 300, 500

Available parameters

Variable Name	CF Standard Name	Description	Unit
danra_projection
r	relative_humidity	Relative humidity	%
t	air_temperature	Temperature	K
u	x_wind	u-component of wind	m s-1
v	y_wind	v-component of wind	m s-1

Pressure Levels

Pressure level parameters

Pressure level refers to parameters that are defined at specific pressure levels in the atmosphere.

Available pressure levels (hPa)

1000, 950, 925, 900, 850, 800, 700, 600, 500, 400, 300, 250, 200, 100

Available parameters

Variable Name	CF Standard Name	Description	Unit
ciwc	atmosphere_mass_content_of_cloud_ice	Cloud ice	kg m-2
cwat	atmosphere_mass_content_of_cloud_liquid_water	Cloud water	kg m-2
danra_projection
r	relative_humidity	Relative humidity	%
t	air_temperature	Temperature	K
tw	upward_air_velocity	Vertical velocity	m s-1
u	x_wind	u-component of wind	m s-1
v	y_wind	v-component of wind	m s-1
z	geopotential	Geopotential	m2 s-2

Special Parameters

Special parameters

The following parameters are encoded using a different schema than WMO standards. Thus, we provide a brief description of those below.

Precipitation type

The precipitation type, prtp0m, describes the most prevalent type of precipitation in the given time frame. The following types are available:

Code	Description
0	Drizzle
1	Rain
2	Sleet
3	Snow
4	Freezing drizzle
5	Freezing rain
6	Graupel
7	Hail

Icing index

The icing index, icei0m, is a measure of the risk of icing in the atmosphere. The index is calculated as the maximum risk of icing somewhere in the atmosphere column. The index is an integer between 1 and 4, corresponding to the following risk levels:

Code	Description
1	Trace
2	Light
3	Moderate
4	Severe

AROME Hail diagnostic

The hail diagnostic, xhail0m, is a measure of the risk of hail. It is the maximum total column graupel in kg/m^2 since previous post-processing. Values above 16 kg/m^2 are considered to be a risk of hail.