A novel, particle based, probabilistic approach for the simulation of cloud microphysics is proposed, which is named the Super-Droplet Method (SDM). This method enables accurate simulation of cloud microphysics with less demanding cost in computation. SDM is applied to a warm-cloud system, which incorporates sedimentation, condensation/evaporation, and stochastic coalescence. The methodology to couple super-droplets and a non-hydrostatic model is also developed. It is confirmed that the result of our Monte Carlo scheme for the stochastic coalescence of super-droplets agrees fairly well with the solutions of the stochastic coalescence equation. The behavior of the model is evaluated using a simple test problem, that of a shallow maritime cumulus formation initiated by a warm bubble. Possible extensions of SDM are briefly discussed. A theoretical analysis suggests that the computational cost of SDM becomes lower than the spectral (bin) method when the number of attributes - the variables that identify the state of each super-droplet - becomes larger than some critical value, which we estimate to be in the range $2\sim4$.
Boundary-layer scheme selection outweighs microphysics in WRF simulations of the August 2018 Kerala extreme rainfall event
Indian Institute of Technology Bhubaneswar(印度布巴内斯瓦尔理工学院);Indian Institute of Technology Bombay(印度孟买理工学院);Cochin University of Science and Technology(科钦科技大学)
On the possible role of condensation-related hydrostatic pressure adjustments in intensification and weakening of tropical cyclones
Theoretical Physics Division, Petersburg Nuclear Physics Institute(彼得堡核物理研究所理论物理部);Institute for Advanced Study, Technical University of Munich(慕尼黑工业大学高等研究院)
From stable online coupling to decade-long climate simulations: A machine learning parameterization for cloud microphysics in ICON
Deutsches Zentrum für Luft- und Raumfahrt e.V.(德国航空航天中心);University of Oxford(牛津大学);European Centre for Medium-Range Weather Forecasts(欧洲中期天气预报中心);University of Bremen(不来梅大学)
PRecover 1.0: Process Rate Recovery with Machine Learning
Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology(卡尔顿理工学院气象与气候研究所);Faculty of Geosciences and Environment, University of Lausanne(洛桑大学地球科学与环境学院);Expertise Center for Climate Extremes, University of Lausanne(洛桑大学气候极端研究中心)
Stable Machine-Learning Parameterization of Subgrid Processes in a Comprehensive Atmospheric Model Learned From Embedded Convection-Permitting Simulations