Journal ArticleDOI
Roll vortices in the planetary boundary layer: A review
D. Etling,Robert A. Brown +1 more
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TLDR
Roll vortices may be loosely defined as quasi-two-dimensional organized large eddies with their horizontal axis extending through the whole planetary boundary layer (PBL), and their indirect manifestation is most obvious in so-called cloud streets as can be seen in numerous satellite pictures as mentioned in this paper.Abstract:
Roll vortices may be loosely defined as quasi two-dimensional organized large eddies with their horizontal axis extending through the whole planetary boundary layer (PBL). Their indirect manifestation is most obvious in so-called cloud streets as can be seen in numerous satellite pictures. Although this phenomenon has been known for more than twenty years and has been treated in a review by one of us (R.A.Brown) in 1980, there has been a recent resurgence in interest and information. The interest in ocena/land-atmosphere interactions in the context of climate modeling has led to detailed observational and modeling efforts on this problem. The presence of rolls can have a large impact on flux modelling in the PBL. Hence, we shall review recent advances in our understanding of organized large eddies in the PBL and on their role in vertical transport of momentum, heat, moisture and chemical trace substances within the lowest part of the atmosphere.read more
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RETRACTED: Large-eddy simulation of the hurricane boundary layer: Evaluation of the planetary boundary-layer parametrizations
TL;DR: In this paper, largeeddy simulations (LESs) were conducted to explicitly resolve the organized roll vortices in the hurricane boundary layer over the ocean using the Weather Research and Forecasting (WRF) model.
Journal ArticleDOI
A High-Resolution Simulation of Roll Convection Over the Yellow Sea During a Cold Air Outbreak
Journal ArticleDOI
Helicity and Turbulence in the Atmospheric Boundary Layer
TL;DR: In this article, a qualitative and quantitative comparison with the observed values is carried out on the basis of results of numerical simulations using the quasi-two-dimensional model and a WRF-ARW mesoscale atmospheric nonhydrostatic model.
Journal ArticleDOI
Simulation and Analysis of the Initiation of a Squall Line within a Meiyu Frontal System in East China
Xia Luo,Ming Xue,Jianfang Fei +2 more
TL;DR: Based on the ARPS (Advanced Regional Prediction System) at 2 km grid spacing, the convective initiation (CI) of cells that evolved into a squall line on the southern flank of a Meiyu front in East China is investigated in this paper.
References
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Journal ArticleDOI
Coherent Motions in the Turbulent Boundary Layer
TL;DR: In this paper, the role of coherent structures in the production and dissipation of turbulence in a boundary layer is characterized, summarizing the results of recent investigations, and diagrams and graphs are provided.
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A Large-Eddy-Simulation Model for the Study of Planetary Boundary-Layer Turbulence
TL;DR: In this paper, a new large-eddy-simulation (LES) model code which uses a mixed pseudospectral finite-difference method was developed and tested with a simple vortex flow and with the Wangara day-33 data.
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A simple model of the atmospheric boundary layer; sensitivity to surface evaporation
I B Troen,Larry Mahrt +1 more
TL;DR: In this paper, a simple formulation of the boundary layer is developed for use in large-scale models and other situations where simplicity is required, where some resolution is possible within the boundary layers, but where the resolution is insufficient for resolving the detailed boundary-layer structure and overlying capping inversion.
Journal ArticleDOI
Numerical Investigation of Neutral and Unstable Planetary Boundary Layers
TL;DR: In this article, numerical integrations are presented for a neutrally stratified planetary boundary layer containing a passive scalar, and for three unstable cases with upward heat flux, assuming the air is assumed unsaturated.