Climate and Catastrophe Risk Assessment - Asia
Met Office aars
Modelling Domain
Federal Ministry
for the Environment, Nature Conservation
and Nuclear Safety
part of the Oasis Platform for Climate and Catastrophe Risk Assessment -
Asia, a project funded by the International Climate Initiative (IKI)
42°N
36°N
72°E
78°E
84 E
90°E
96 E
102°E
108°E
42"N
4.4km domain
36°N
30°N
30°N
1.5km domain
24 N
18 N
12°N
6 N
72°E
78 E
84°E
90°E
96°E
102°E
108 E
24°N
18°N
12°N
6 N
4.4km
(~800 x 800)
1.5km
(~ 550 x 400)
Grid cell comparison (to scale)
ERA5 (25km)
4.4km cell
1.5km cell
Our high-resolution convection-permitting modelling utilises the
latest generation Met Office Unified Model v11.1, regional
atmosphere configuration RA2-C. We run the regional model in a
'downscaling' configuration, using ERA5 data to initialise the
model and provide boundary conditions.
Key Point (a) ▸ Model output is available at 4.4km (0.0405°) and 1.5km (0.0135°)
over two nested domains: the 4.4km domain avoids placing
model boundaries over the Himalayas and covers Nepal, Bhutan,
Myanmar, most of India, and parts of the Tibetan plateau so as to
facilitate hydrological modelling of the Ganges-Brahmaputra-
Meghna river basins; the 1.5km domain is limited to Bangladesh
only.
Due to the complex topography of the regional, numerically stable
model runs required timesteps of 30 seconds at both resolutions,
with additional orographic smoothing applied (using a 1-2-1 filter)
to grid cells 1500m above mean sea level.
www.metoffice.gov.uk
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