ICON

Model description

ICON is a non-hydrostatic model discretised over an icosahedral as described by Zängl et al. (2015).  Here it is run in a global configuration using a set up similar to that described by Klocke et al. (2017).

Data structure

Vertical

The number of vertical levels is chosen as 90. A detailed description of the placement of the vertical levels can be downloaded here.

Horizontal

ICON employs horizontal grid spacing of 5km (R2B9) and 2.5km (R2B10), comprising 20 971 520 (5km)/ 83 886 080 (2.5km) grid columns.

Data

Full State Variables (3D), Output Interval: PT01H

Output will be written from level 17 (ca. 40km) onwards.

u

zonal wind

v

meridional wind

w

vertical wind

temp

actual temperature

pres

pressure

qv

specific humidity

tot_qc_dia

specific cloud water

tot_qi_dia

specific cloud ice

Selected Horizontal Slices (2D), Output Interval: PT15M

u_10m

zonal wind in 10m

v_10m

meridional wind in 10m

t_2m

temperature in 2m

qv_2m

specific water vapor in 2m

tqv_dia

total column integrated water vapor

tqc_dia

total column integrated cloud water

tqi_dia

total column integrated cloud ice

tqg

total column integrated graupel

tqs

total column integrated snow

tqr

total column integrated rain

clct

total cloud cover

lhfl_s

surface latent heat flux

shfl_s

surface sensible heat flux

asob_s

surface net solar radiation mean since model start

athb_s

surface net thermal radiation mean since model start

asob_t

TOA net solar radiation mean since model start

athb_t

TOA net thermal radiation mean since model start

asou_t

Top up solar radiation [W/m2], accumulated

asodifu_s

Surface shortwave diffuse upward flux

athd_s

Surface down thermal radiation [W/m2], accumulated

athu_s

Surface up thermal radiation [W/m2], accumulated

pres_sfc

surface pressure

tot_prec

total precipitation

cape_ml

conv. avail. pot. energy of mean surf. layer parcel

cin_ml

conv. inhib. of mean surf. layer parcel

t_g

ground temperature

qv_s

surface specific humidity

ufml_s

u momentum flux at surface

vfml_s

v momentum flux at surface

Initialisation and Boundary conditions

Soil Initialisation

Initial soil data are derived from the ECMWF IFS model state at the initialisation date and time.

Input Data

ICON uses the provided grib file with IFS data from 01 Aug 2016.

Treatment of SST and Sea Ice

ICON uses the provided IFS data (7 day means).

See also