High-resolution regional weather and climate modelling at the Bureau of Meteorology
Charmaine Franklin (@cnf), Bureau of Meteorology
Weston Theatre (and online). See the main workshop help topic for zoom details.
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Excellent talk, Charmaine, and wonderful to see the focus on urban representation in regional modeling which is greatly needed as our models are getting higher and higher resolution. Can you also elaborate on how urban representation is implemented? What are the urban processes that are parameterized and what are future work on improving urban representation?
I would be very interested to know whether the Antarctic high resolution model could be informative about the surface melt conditions on the Amery Ice Shelf, and what level of “Land Surface” scheme is used - there is subtle topography and complicated lake and stream systems on the ice shelf in summer.
Thanks for your questions - I’ll tag Charmiane @cnf here to reply!
Thanks Negin, as well as the fraction of a grid box that is covered by urban surfaces, MORUSES (Met Office and Reading Urban Surface Exchange Scheme) also requires information about the urban morphology (which varies spatially): mean building height, height to width ratio and repeating width ratio.
The presence of a street canyon (building height and street width) in MORUSES allows modelling of short and longwave radiative trapping. Turbulent scalar fluxes are computed through a resistance network that responds to canyon geometry. Bulk parameters such as albedo, emissivity and heat capacity are calculated from the canyon geometry and material properties for roads and walls.
Details in https://doi.org/10.1002/qj.668