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The Korean Integrated Model (KIM) System for Global Weather Forecasting
홍송유,권영철,김태훈,김정은,최석진,권인혁,김정한,이은희,박래솔,김동일 한국기상학회 2018 Asia-Pacific Journal of Atmospheric Sciences Vol.54 No.-
The Korea Institute of Atmospheric Prediction Systems (KIAPS) began a national project to develop a new global atmospheric model system in 2011. The ultimate goal of this 9-year project is to replace the current operational model at the Korea Meteorological Administration (KMA), which was adopted from the United Kingdom’s Meteorological Office’s unified model (UM) in 2010. The 12-km Korean Integrated Model (KIM) system, consisting of a spectral-element non-hydrostatic dynamical core on a cubed sphere grid and a state-of-the-art physics parameterization package, has been launched in a real-time forecast framework, with initial conditions obtained via the advanced hybrid four-dimensional ensemble variational data assimilation (4DEnVar) over its native grid. A development strategy for KIM and the evolution of its performance in medium-range forecasts toward a world-class global forecast system are described. Outstanding issues in KIM 3.1 as of February 2018 are discussed, along with a future plan for operational deployment in 2020.
홍송유,장지현 한국기상학회 2018 Asia-Pacific Journal of Atmospheric Sciences Vol.54 No.-
This study investigates the impacts of shallow convection schemes on a simulated seasonal climatology in the Global and Regional Integrated Model system (GRIMs). The eddy-diffusivity scheme of Tiedtke (TDK) is evaluated, focusing on the dependency upon deep convection schemes. Drying and warming near the top of the planetary boundary layer (PBL) and opposing effects above are observed. The height of PBL is reduced due to the increase of thermal stability near the PBL top. The weakened PBL turbulence is partly compensated with the increased downward solar radiation due to the reduction of low clouds. These effects are pronounced over the oceans, which leads to the modulation of tropical precipitation. It is found that the original TDK scheme shows similar behavior regardless of the choice of deep convection schemes. A revised TDK scheme that explicitly couples the PBL and shallow convection processes is proposed and evaluated. The proposed scheme generally improves the simulated climatology over the results with the original TDK scheme, along with further improvement in the case of the revised deep convection scheme. Our results indicate that the role of the shallow convection scheme needs to be carefully examined to improve the performance of atmospheric models, with a focus on modulated PBL and deep convection processes.
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.
송유장,권용승,홍종범,민병훈,이규준,정명화,이종수,안중호 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.2
This paper reports the superconducting behavior of the tetragonal iron-chalcogenide superconductor FeSe. The electrical resistivity and the magnetic moment measurements confirmed its superconductivity with T^(zero)_c and T^(mag)_c of 9.4 K under ambient pressure. Electron probe macro analysis indicated that the sample had a stoichiometric Fe:Se ratio of 1:1. The Seebeck coefficient, which was 12.3 μV/K at room temperature, changed to a negative value near 200 K, indicating it to be a two-carrier material. Above T_c, the ρ(T) curve revealed an ‘S’ shape, and dρ(T)/dT and d^2ρ(T)/dT^2 showed two anomalous features, one near T_(an) = 30 K and the other near T^* = 110 K. The Seebeck coefficient, S(T), also displays peculiar behavior near the T_(an) and T^*. We also report a rather smaller critical current density, J_c = 10^2 ∼ 10^4 A/cm^2, compared to those observed forthe other pnictides and doped chalcogenides.
이승권,박록진,홍송유,구명석,정재인,예상욱 한국기상학회 2022 Asia-Pacific Journal of Atmospheric Sciences Vol.58 No.5
We describe a new chemistry-climate model, Global/Regional Integrated Model system Chemistry Climate Model (GRIMs-CCM), developed by coupling the chemistry modules of the GEOS-Chem chemical transport model to the GRIMs generalcirculation model. The GRIMs-CCM is driven by meteorological variables simulated by the GRIMs and uses simulated gasand aerosol concentrations to calculate the radiative transfer equations at each time step. The model is evaluated by comparingozone and aerosol concentrations with respective observations from the surface networks and the satellite datasets. It isfound that the GRIMs-CCM successfully reproduces the observed spatial distributions of annual-mean aerosol optical depthand captures the seasonal and latitudinal variations of total column ozone. The evaluation of simulated aerosols in surfaceair against the observations reveals that the model reproduces the observed temporal and spatial variations but shows biasesin soil dust aerosols. We also estimate the climatic impact of aerosols by conducting two sets of 10-year simulations forthe preindustrial and present conditions. The GRIMs-CCM shows the aerosol radiative forcing of−0.30 W m−2 from thepreindustrial to present-day climates, comparable to the values from other climate model intercomparison projects. Theseresults suggest that the GRIMs-CCM is suitable for studying chemistry-climate interactions and their changes over time.