Evaluation of the Impact of Horizontal Grid Spacing in Terra Incognita on Coupled Mesoscale–Microscale Simulations Using the WRF Framework

Autor:	Jeffrey D. Mirocha, Caroline Draxl, Brandon Lee Ennis, Sue Ellen Haupt, Larry K. Berg, Branko Kosovic, Raj K. Rai
Rok vydání:	2019
Předmět:	Coupling Atmospheric Science 010504 meteorology & atmospheric sciences 020209 energy Mesoscale meteorology 02 engineering and technology Inflow Forcing (mathematics) Grid Atmospheric sciences 01 natural sciences Physics::Fluid Dynamics Flow conditions Weather Research and Forecasting Model 0202 electrical engineering electronic engineering information engineering Physics::Atmospheric and Oceanic Physics Geology Microscale chemistry 0105 earth and related environmental sciences
Zdroj:	Monthly Weather Review. 147:1007-1027
ISSN:	1520-0493 0027-0644
Popis:	Coupled mesoscale–microscale simulations are required to provide time-varying weather-dependent inflow and forcing for large-eddy simulations under general flow conditions. Such coupling necessarily spans a wide range of spatial scales (i.e., ~10 m to ~10 km). Herein, we use simulations that involve multiple nested domains with horizontal grid spacings in the terra incognita (i.e., km) that may affect simulated conditions in both the outer and inner domains. We examine the impact on simulated wind speed and turbulence associated with forcing provided by a terrain with grid spacing in the terra incognita. We perform a suite of simulations that use combinations of varying horizontal grid spacings and turbulence parameterization/modeling using the Weather Research and Forecasting (WRF) Model using a combination of planetary boundary layer (PBL) and large-eddy simulation subgrid-scale (LES-SGS) models. The results are analyzed in terms of spectral energy, turbulence kinetic energy, and proper orthogonal decomposition (POD) energy. The results show that the output from the microscale domain depends on the type of turbulence model (e.g., PBL or LES-SGS model) used for a given horizontal grid spacing but is independent of the horizontal grid spacing and turbulence modeling of the parent domain. Simulation using a single domain produced less POD energy in the first few modes compared to a coupled simulation (one-way nesting) for similar horizontal grid spacing, which highlights that coupled simulations are required to accurately pass the mesoscale features into the microscale domain.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::14cb210c76f6ca85979531dab87a3107 https://doi.org/10.1175/mwr-d-18-0282.1 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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