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A History of Mesoscale Model Development
Jimy Dudhia 한국기상학회 2014 Asia-Pacific Journal of Atmospheric Sciences Vol.50 No.1
The development of atmospheric mesoscale models fromtheir early origins in the 1970’s until the present day is described. Evolution has occurred in dynamical and physics representations inthese models. The dynamics has had to change from hydrostatic tofully nonhydrostatic equations to handle the finer scales that havebecome possible in the last few decades with advancing computerpower, which has enabled real-time forecasting to go to finer gridsizes. Meanwhile the physics has also become more sophisticatedthan the initial representations of the major processes associated withthe surface, boundary layer, radiation, clouds and convection. Asresolutions have become finer, mesoscale models have had to changeparadigms associated with assumptions related to what is consideredsub-grid scale needing parameterization, and what is resolved wellenough to be explicitly handled by the dynamics. This first occurredwith cumulus parameterization as real-time forecast models becameable to represent individual updrafts, and is now starting to occur inthe boundary layer as future forecast models may be able resolveindividual thermals. Beyond that, scientific research has provided agreater understanding of detailed microphysical and land-surfaceprocesses that are important to aspects of weather prediction, andthese parameterizations have been developing complexity at a steadyrate. This paper can just give a perspective of these developments inthe broad field of research associated with mesoscale atmosphericmodel development.
홍송유,Jimy Dudhia 한국기상학회 2023 Asia-Pacific Journal of Atmospheric Sciences Vol.59 No.3
The purpose of this comment is to provide a physical reasoning for the ice crystals-habit parameters in WSM and WDMMPs (Hong et al. 2004), in which intrinsic numerical “errors” in the original scheme are corrected in the subject paper (Kimet al. 2022). Here, we confirm that the parameters in Hong et al. are revisions made to the originally derived values (newmethod in Kim et al.) by considering uncertainties in the derived formula from limited observations and characteristics ofice-microphysical processes that were devised in Hong et al. Thus, “Numerical errors in ice microphysics parameterizations”in the title of the subject paper is incorrect and related discussions could be misleading.
Investigation of hydrometeor fall speeds in bulk microphysics parameterizations
Kyo-Sun Lim,Song-You Hong,Jimy Dudhia 한국기상학회 2007 한국기상학회 학술대회 논문집 Vol.2007 No.-
This study examined the effect of new mass-weighted sedimentation velocities of snow and graupel in the WSM6 microphysics scheme, based on the observational evidence. As riming begins, the snow/graupel weight is more towards snow, and the fall speed is more like snow, but as riming completes, the mixture transitions towards a graupel fall speed. As a result, the new formula changes the proportion of mixing ratio (i.e., especially, snow and graupel) improving the distribution of hydrometeors as compared with observed data and alleviates excessive precipitation problem in the WSM6 scheme.