ICON. Limited-area mode (ICON-LAM) and updated verification results. Günther Zängl, on behalf of the ICON development team
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1 ICON Limited-area mode (ICON-LAM) and updated verification results Günther Zängl, on behalf of the ICON development team COSMO General Meeting, Offenbach,
2 Outline Status of limited-area-mode (ICON-LAM) and basic evaluation tests Progress in forecast at DWD: ICON-EU vs. COSMO-EU and WMO verification of ICON (global) against other global NWP models
3 Status of ICON-LAM (limited-area mode) a) technical aspects Model grid needs to be precomputed with grid generator Preprocessing tool remapicon executes only horizontal interpolation from source data to ICON grid Initial and boundary data from ICON, COSMO and IFS are supported Vertical interpolation is done within ICON; thus, changing the setup of the vertical grid does not require rerunning remapicon Boundary data can be read asynchronously with prefetching on a dedicated processor
4 Status of ICON-LAM (limited-area mode) a) technical aspects Boundary data can be restricted to stripes along the lateral boundaries, covering the interpolation and nudging zones (COSMO model always requires data for full domain) Apart from boundary data supply, the limited-area mode is technically nearly identical to one-way nesting, where boundary data are updated at each model time step This implies that no physics parameterizations are active in boundary interpolation zone; model output can be masked there Nesting (one-way or two-way) can be combined with limited-area mode Unlike the COSMO-model, no built-in nudging data assimilation is available (3D-Var / EnKF DA is separate code package)
5 Status of ICON-LAM (limited-area mode) b) exemplary functionality test Case study for 72h-forecast starting on 11 July 2016, 00 UTC (frontal passage with heavy precipitation in the Alpine region) Initial and boundary conditions taken from operational ICON-EU forecast (6.5 km) Mesh size of limited-area grid 3.25 km; 60 levels up to ~ 22 km Comparison between limited-area run with two-way and one-way nesting in ICON-EU Reference experiment with convection scheme, limited-area experiment also conducted without convection scheme
6 Model orography
7 Sea-level pressure, 72h-forecast 2-way nested expt.
8 Sea-level pressure, 72h-forecast 1-way nested expt.
9 Sea-level pressure, 72h-forecast limited-area expt.
10 Sea-level pressure, 72h-forecast limited-area expt. without convection scheme
11 Accumulated precipitation, 72h-forecast 2-way nested expt.
12 Accumulated precipitation, 72h-forecast 1-way nested expt.
13 Accumulated precipitation, 72h-forecast limited-area expt.
14 Accumulated precipitation, 72h-forecast limited-area expt. without convection scheme
15 Verification results COSMO-EU vs. ICON-EU monthly RMSEs of 2m-temperature green: COSMO-EU; black: ICON-EU
16 Precipitation > 0.1 mm/6h blue: COSMO-EU; red: ICON-EU
17 Precipitation > 2 mm/6h blue: COSMO-EU; red: ICON-EU
18 Precipitation > 10 mm/6h blue: COSMO-EU; red: ICON-EU
19 Verification results COSMO-EU vs. ICON-EU wind direction, relative humidity, temperature and geopotential against radiosondes green: COSMO-EU; black: ICON-EU
20 ICON EDA WMO verification against radiosondes: Temperature, wind speed and geoptential at 850 hpa, northern hemisphere, RMSE, lead time 72 h
21 ICON EDA WMO verification against radiosondes: Temperature, wind speed and geoptential at 850 hpa, tropics, RMSE, lead time 72 h
22 Summary limited-area mode (ICON-LAM) Boundary artifacts are very small although there have been no tuning efforts for boundary nudging zone so far Differences between limited-area mode and 1-way nesting are somewhat larger than between 1-way and 2-way nesting due to less accurate (hourly) boundary data supply, but changing physics parameterizations makes a much larger difference verification results ICON-EU shows better verification scores then COSMO-EU for most variables, particularly large improvements are found for T2M WMO verification scores against UKMO, Météo-France and ECMWF demonstrate substantial improvement of ICON (global) over GME
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