Sub-km grid NWP for regions with complex orography
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1 Sub-km grid NWP for regions with complex orography Challenges with station forecast Experimental 750-metre DMI Xiaohua Yang, DMI
2 Operational experiences Since late 2016, DMI and IMO operate jointly IGA-2.5 km with HARMONIE-AROME 40h1.1 On a 2500 km x 2000 km domain covering South Greenland and Iceland
3 Operational experiences Since late 2016, DMI and IMO operate jointly IGA-2.5 km with HARMONIE-AROME 40h1.1 On a 2500 km x 2000 km domain covering South Greenland and Iceland (almost) All measurement stations (residential areas) in Greenland are at the coastal regions with complex orography
4 Statement of problems: Pros& Cons with HARMONIE-IGA (2.5 km) 24.5 m/s ECMWF DMI-HIRLAM-K05 IGA While ECMWF HiRES (9 km) and HIRLAM K05 (5.5 km) fail to predict wind over storm (24.5 m/s) for winter Greenland, HARMONIE-IGA (2.5 km) can. There is many incidence of over-prediction compared to observations.
5 km HIRLAM 5 km HIRLAM 2.5 km HARMONIE Observation h wind forecast with IGA for Ikermiit: extradinarily good
6 HIRLAM T15 HIRLAM K05 HARMONIE IGA Tasiilaq Greenland
7 For Qaanaaq, IGA & other models under-forecast storms.
8 Operational experiences Wind forecast for TASIILAQ Some of the over-prediction are associated with intensity and phase error......
9 Operational experiences 2. Some over-forecast cases were associated with strong local variability On 17/ , while TASIILAQ wind measurement reads 6 m/s, it measured m/s from the ship mast offshore the TASIILAQ harbour a few km away. (Courtesy Ship Captain Eyðun Simonsen, M/V Arina Arctica)
10 Strong local variability <== Complex orography ==> Needs very high resolution to resolve!!
11 5 km Aspect ratio ~1 2.5 km 750 m
12 HIRLAM-K05 5 km HARMONIE IGA 2.5 km Jan , 18 UTC HARMONIE TAS 750 m
13 Wind forecast from a 750 m HARMONIE-AROME Centered in Tasiilaq, East Greenland, Jan km Seeing a storm
14 Faroe Islands Orography as seen with 750 m HARMONIE 5 KM
15 Christmas hurrican/ storm in Faroe Islands as simulated by 0.75 km-grid HARMONIE-arome Dec KM
16 HARMONIE-lite --- Possible supplementary NWP setup focusing on local storms Domains: 400x400x65, 0.75 km Cubic grid, LUNBC=T, VESL=0.1 DT=30s Blending, 24 fcst/6 h Peak use of CPU capacity on DMI s current operational Cray clustre: 3% Additional domains on-demand
17 HARMONIE-lite --- Possible supplementary NWP setup focusing on local storms Qaanaaq, Greenland
18 HARMONIE-lite --- Possible supplementary NWP setup focusing on local storms Nuuk, Greenland
19 HARMONIE-lite --- Possible supplementary NWP setup focusing on local storms Tasiilaq, Greenland
20 HARMONIE-lite --- Possible supplementary NWP setup focusing on local storms Vaga, Faroe Islands
21 HARMONIE-lite --- Possible supplementary NWP setup focusing on local storms Westfjords, Iceland
22 0 0 0 Tasiilaq Nuuk Harmonie-arome 0.75 km Harmomie-arome 2.5 km ECMWF Hires 9 km Vága
23 Summary Coastal Greenland/Iceland/Faroe Islands feature extreme weather situations associated with complex orography of very small scales. Aspect ratio (DX/DZ) approaches 1 ==> nonhydrostatic Weather extremes at km scales => 2.5 km grid resolution not sufficient While IGA in general is superior to coarser resolution models for wind forecast in Greenland, it deviates significantly from validating observations for some stations Single point deterministic forecast ( station forecast ) needs to consider spatial variability (upscaling; probabilistic information) Preliminary results with HARMONIE-AROME on sub-km grid-scale NWP appear promising Simulated flow appear realistic Satisfactory stability and affordability (DT=30s for cubic grid, VESL=0.1, LUNBC) Verification statistics on wind parameters look superior to coarser resolution Near future outlook: HARMONIE-lite at DMI: reliable and affordable Several configuration options to be checked further Optimal horizontal resolution (1 km? 750 m? 500m?) domain size (720x720, 400x400) Vertical resolution (L90?) Nesting and data assimilation Physical parameterisation and diagnosis
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