Journal ArticleDOI
Roll vortices in the planetary boundary layer: A review
D. Etling,Robert A. Brown +1 more
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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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Objective analysis of marine winds with the benefit of the Radarsat‐1 synthetic aperture radar: A nonlinear regression framework
TL;DR: In this article, surface wind analyses are constructed from spaceborne synthetic aperture radar (SAR) measurements along coastal regions of eastern and western North America and collocated operational marine wind forecasts.
Journal ArticleDOI
Diurnal evolution of negative atmospheric ions above the boreal forest: from ground level to the free troposphere
Lisa A. Beck,Mikael Ehn,Daniela Wimmer,Siegfried Schobesberger,Xu-Cheng He,Anna Franck,Murodullayeva Farangiz Oʻtkirbek qiz, Izbosarova Sevinch Tirkash qizi, Begimqulova Mashhura Olimjon…,A. Gahmousse,Gunther Kolb,Akambi Mohamed Mama,Tracey Herrington,Partha S. Biswas,Priscilla Nelson +12 more
TL;DR: In this paper , the authors measured the vertical profile of atmospheric ions in the stable boundary layer, residual layer, mixing layer, and free troposphere and observed that the ion composition is distinctly different in each layer and depends on the air mass origin and time of the day.
Journal ArticleDOI
Initial MST radar observations of upper tropospheric-lower stratospheric duct-like structures over Jicamarca, Peru
TL;DR: In this paper, the authors present the results of simple numeri- cal simulations used in an attempt to mimic these observed features. But, the simulation results show that a fair replication of the observed ducted structure in the numerical model is found, the observed pe- riod of 90 min is nonetheless much longer than what is tra- ditionally observed.
Posted ContentDOI
Observing system simulation experiments double scientific return of surface-atmosphere synthesis
Stefan Metzger,Stefan Metzger,David Durden,Sreenath Paleri,Matthias Sühring,Brian J. Butterworth,Christopher Florian,Matthias Mauder,David M. Plummer,Luise Wanner,Ke Xu,Ankur R. Desai +11 more
TL;DR: In this article, the observing system design of multi-disciplinary field measurements involves a variety of considerations on logistics, safety, and science objectives Typically, this is done based on the investigator
Visualization of Doppler Radar Data -Three-Dimensional Images of Snow Bands-
Masayuki Maki,Hideo Miyachi +1 more
TL;DR: In this article, three-dimensional computer graphic techniques are applied to the processing of snowstorm radar data, such as zooming, changing the viewing angle and making arbitrary cross-sections are useful for the analysis of radar data.
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.
Journal ArticleDOI
A Large-Eddy-Simulation Model for the Study of Planetary Boundary-Layer Turbulence
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Journal ArticleDOI
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.