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Large Eddy Simulation Of Stratocumulus Topped Boundary Layer With An Explicit And A New Bulk Microphysics Scheme
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Book Synopsis Large-eddy Simulation of Stratocumulus-topped Boundary Layer with an Explicit and a New Bulk Microphysics Scheme by : Marat Khairoutdinov
Download or read book Large-eddy Simulation of Stratocumulus-topped Boundary Layer with an Explicit and a New Bulk Microphysics Scheme written by Marat Khairoutdinov and published by . This book was released on 1997 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721631490 Total Pages :26 pages Book Rating :4.6/5 (314 download)
Book Synopsis Large-Eddy Simulation of Stratocumulus-Topped Atmospheric Boundary Layers with Dynamic Subgrid-Scale Models by : National Aeronautics and Space Administration (NASA)
Download or read book Large-Eddy Simulation of Stratocumulus-Topped Atmospheric Boundary Layers with Dynamic Subgrid-Scale Models written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-21 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the present study is to evaluate the dynamic procedure in LES of stratocumulus topped atmospheric boundary layer and assess the relative importance of subgrid-scale modeling, cloud microphysics and radiation modeling on the predictions. The simulations will also be used to gain insight into the processes leading to cloud top entrainment instability and cloud breakup. In this report we document the governing equations, numerical schemes and physical models that are employed in the Goddard Cumulus Ensemble model (GCEM3D). We also present the subgrid-scale dynamic procedures that have been implemented in the GCEM3D code for the purpose of the present study. Senocak, Inane Ames Research Center
Book Synopsis Large Eddy Simulation of a Nocturnal Stratocumulus Topped Marine Atmospheric Boundary Layer by : Andreas Chlond
Download or read book Large Eddy Simulation of a Nocturnal Stratocumulus Topped Marine Atmospheric Boundary Layer written by Andreas Chlond and published by . This book was released on 1999 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Large Eddy Simulations of Stratocumulus-topped Boundary Layers by : Wing Yee Hester Leung
Download or read book Large Eddy Simulations of Stratocumulus-topped Boundary Layers written by Wing Yee Hester Leung and published by . This book was released on 2015 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Large-Eddy Simulation of Stratocumulus-Topped Atmospheric Boundary Layers with Dynamic Subgrid-Scale Models by : Inanc Senocak
Download or read book Large-Eddy Simulation of Stratocumulus-Topped Atmospheric Boundary Layers with Dynamic Subgrid-Scale Models written by Inanc Senocak and published by . This book was released on 2003 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earth's climate and its geographical variation is strongly influenced by cloud coverage. It is estimated that about 50% of the earth is covered by clouds at any given time, providing a shield from solar radiation. Radiative energy transfer and its interaction with clouds play an important role in the thermal structure and stratification of the atmosphere. For instance, clouds have high reflectivity in the visible wavelengths, thus providing relative cooling of the atmosphere. They also absorb strongly in the infrared wavelengths, resulting in heating of the atmosphere (Salby 1996).
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1998 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Storm and Cloud Dynamics by : William R. Cotton
Download or read book Storm and Cloud Dynamics written by William R. Cotton and published by Academic Press. This book was released on 2010-12-21 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt: Storm and Cloud Dynamics focuses on the dynamics of clouds and of precipitating mesoscale meteorological systems. Clouds and precipitating mesoscale systems represent some of the most important and scientifically exciting weather systems in the world. These are the systems that produce torrential rains, severe winds including downburst and tornadoes, hail, thunder and lightning, and major snow storms. Forecasting such storms represents a major challenge since they are too small to be adequately resolved by conventional observing networks and numerical prediction models. - Provides a complete treatment of clouds integrating the analysis of air motions with cloud structure, microphysics, and precipitation mechanics - Describes and explains the basic types of clouds and cloud systems that occur in the atmosphere-fog, stratus, stratocumulus, altocumulus, altostratus, cirrus, thunderstorms, tornadoes, waterspouts, orographically induced clouds, mesoscale convection complexes, hurricanes, fronts, and extratropical cyclones - Summarizes the fundamentals, both observational and theoretical, of atmospheric dynamics, thermodynamics, cloud microphysics, and radar meteorology, allowing each type of cloud to be examined in depth - Integrates the latest field observations, numerical model simulations, and theory - Supplies a theoretical treatment suitable for the advanced undergraduate or graduate level, as well as post-graduate
Download or read book Monthly Weather Review written by and published by . This book was released on 2003 with total page 1164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Large Eddy Simulation of the Diurnal Cycle in Southeast Pacific Stratocumulus by :
Download or read book Large Eddy Simulation of the Diurnal Cycle in Southeast Pacific Stratocumulus written by and published by . This book was released on 2008 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes a series of 6 day large eddy simulations of a deep, sometimes drizzling stratocumulus-topped boundary layer based on forcings from the East Pacific Investigation of Climate (EPIC) 2001 field campaign. The base simulation was found to reproduce the observed mean boundary layer properties quite well. The diurnal cycle of liquid water path was also well captured, although good agreement appears to result partially from compensating errors in the diurnal cycles of cloud base and cloud top due to overentrainment around midday. At other times of the day, entrainment is found to be proportional to the vertically-integrated buoyancy flux. Model stratification matches observations well; turbulence profiles suggest that the boundary layer is always at least somewhat decoupled. Model drizzle appears to be too sensitive to liquid water path and subcloud evaporation appears to be too weak. Removing the diurnal cycle of subsidence had little effect on simulated cloud albedo. Simulations with changed droplet concentration and drizzle susceptibility showed large liquid water path differences at night, but differences were quite small at midday. Droplet concentration also had a significant impact on entrainment, primarily through droplet sedimentation feedback rather than through drizzle processes.
Book Synopsis Stratocumulus-Topped Boundary Layers Over Coastal Land by : Mohamed Sherif Ghonima
Download or read book Stratocumulus-Topped Boundary Layers Over Coastal Land written by Mohamed Sherif Ghonima and published by . This book was released on 2016 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stratocumulus is the most common cloud type and has a strong impact on global climate. Over coastal lands, which are frequently well populated, these clouds have a strong impact on surface temperature and radiation through reflection of incoming solar radiation. The cloud behavior is determined both by small-scale processes such as turbulent mixing between two-phase, two-component, fluids at the cloud top and large-scale circulation such as anticyclones and their climatological occurrence. Due to the large range of spatial scales associated with stratocumulus clouds, global climate models (GCM) and numerical weather prediction models (NWP) parameterize the physical processes occurring in the stratocumulus-topped boundary layer (STBL). However, these models are unable to simulate the clouds accurately. For instance, in the North American Model stratocumulus clouds over the California coast in the summer dissipate earlier than observed via satellite. In this thesis, we first employ high-resolution Large Eddy Simulations (LES) and Mixed Layer Models (MLM) to study mechanisms regulating the timing of the break up. We find that over coastal lands, as the cloud thins during day, turbulence generated by surface fluxes becomes larger than turbulence generated by longwave cooling across the cloud layer. To capture this shift in turbulence generation in the MLM, we extend an existing entrainment parameterization to account for both sources. We find that cloud lifetime depends on a combination of surface moisture content, cloud-top entrainment flux, and large-scale horizontal advection by sea breeze. Next, we evaluate three different planetary boundary layer (PBL) parameterization schemes in the Weather Research and Forecasting (WRF) model in simulating the STBL by benchmarking them against high-resolution LES. We find that the schemes do not take into account the turbulence generated by longwave cooling across the cloud layer and therefore underestimate the mixing of warm-dry tropospheric into the STBL at the cloud top. Thus, we propose a correction to the eddy diffusivity coefficient by adding a term that accounts for turbulence generated throughout the cloud layer as well as at the surface due to buoyancy flux. The modified scheme is then able to simulate the cloud physics similar to that of the LES. The modeling tools developed in this thesis have improved the understanding of and the ability to forecast stratocumulus-topped boundary layers.
Book Synopsis Mixed-layer Models and Large-eddy Simulations of Stratocumulus-topped Marine Boundary Layers by : Junya Uchida
Download or read book Mixed-layer Models and Large-eddy Simulations of Stratocumulus-topped Marine Boundary Layers written by Junya Uchida and published by . This book was released on 2010 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Physical Processes in Clouds and Cloud Modeling by : Alexander P. Khain
Download or read book Physical Processes in Clouds and Cloud Modeling written by Alexander P. Khain and published by Cambridge University Press. This book was released on 2018-07-05 with total page 643 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the most comprehensive and systematic description currently available of both classical and novel theories of cloud processes, providing a much-needed link between cloud theory, observation, experimental results, and cloud modeling. This volume shows why and how modern models serve as a major tool of investigation of cloud processes responsible for atmospheric phenomena, including climate change. It systematically describes classical as well as recent advancements in cloud physics, including cloud-aerosol interaction; collisions of particles in turbulent clouds; and the formation of multiphase cloud particles. As the first of its kind to serve as a practical guide for using state-of-the-art numerical cloud models, major emphasis is placed on explaining how microphysical processes are treated in modern numerical cloud resolving models. The book will be a valuable resource for advanced students, researchers and numerical model designers in cloud physics, atmospheric science, meteorology, and environmental science.
Book Synopsis RACORO Continental Boundary Layer Cloud Investigations. 2. Large-eddy Simulations of Cumulus Clouds and Evaluation with In-situ and Ground-based Observations by :
Download or read book RACORO Continental Boundary Layer Cloud Investigations. 2. Large-eddy Simulations of Cumulus Clouds and Evaluation with In-situ and Ground-based Observations written by and published by . This book was released on 2015 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: A 60-hour case study of continental boundary layer cumulus clouds is examined using two large-eddy simulation (LES) models. The case is based on observations obtained during the RACORO Campaign (Routine Atmospheric Radiation Measurement [ARM] Aerial Facility [AAF] Clouds with Low Optical Water Depths [CLOWD] Optical Radiative Observations) at the ARM Climate Research Facility's Southern Great Plains site. The LES models are driven by continuous large-scale and surface forcings, and are constrained by multi-modal and temporally varying aerosol number size distribution profiles derived from aircraft observations. We compare simulated cloud macrophysical and microphysical properties with ground-based remote sensing and aircraft observations. The LES simulations capture the observed transitions of the evolving cumulus-topped boundary layers during the three daytime periods, and generally reproduce variations of droplet number concentration with liquid water content (LWC), corresponding to the gradient between the cloud centers and cloud edges at given heights. The observed LWC values fall within the range of simulated values; the observed droplet number concentrations are commonly higher than simulated, but differences remain on par with potential estimation errors in the aircraft measurements. Sensitivity studies examine the influences of bin microphysics versus bulk microphysics, aerosol advection, supersaturation treatment, and aerosol hygroscopicity. Simulated macrophysical cloud properties are found to be insensitive in this non-precipitating case, but microphysical properties are especially sensitive to bulk microphysics supersaturation treatment and aerosol hygroscopicity.
Book Synopsis Buoyant Convection in Geophysical Flows by : Erich J. Plate
Download or read book Buoyant Convection in Geophysical Flows written by Erich J. Plate and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 493 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies of convection in geophysical flows constitute an advanced and rapidly developing area of research that is relevant to problems of the natural environment. During the last decade, significant progress has been achieved in the field as a result of both experimental studies and numerical modelling. This led to the principal revision of the widely held view on buoyancy-driven turbulent flows comprising an organised mean component with superimposed chaotic turbulence. An intermediate type of motion, represented by coherent structures, has been found to play a key role in geophysical boundary layers and in larger scale atmospheric and hydrospheric circulations driven by buoyant forcing. New aspects of the interaction between convective motions and rotation have recently been discovered and investigated. Extensive experimental data have also been collected on the role of convection in cloud dynamics and microphysics. New theoretical concepts and approaches have been outlined regarding scaling and parameterization of physical processes in buoyancy-driven geophysical flows. The book summarizes interdisciplinary studies of buoyancy effects in different media (atmosphere and hydrosphere) over a wide range of scales (small scale phenomena in unstably stratified and convectively mixed layers to deep convection in the atmosphere and ocean), by different research methods (field measurements, laboratory simulations, numerical modelling), and within a variety of application areas (dispersion of pollutants, weather forecasting, hazardous phenomena associated with buoyant forcing).
Book Synopsis Observational and Numerical Studies of the Boundary Layer, Cloud, and Aerosol Variability in the Southeast Pacific Coastal Marine Stratocumulus by : Xue Zheng
Download or read book Observational and Numerical Studies of the Boundary Layer, Cloud, and Aerosol Variability in the Southeast Pacific Coastal Marine Stratocumulus written by Xue Zheng and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation investigates the impacts of meteorological factors and aerosol indirect effects on the costal marine stratocumulus (Sc) variations in the southeast Pacific, a region that has been largely unexplored and is a major challenge of the modeling community, through both observational and numerical studies. This study provides a unique dataset for documenting the characteristics of the marine Sc-topped BL off the coast of Northern Chile. The observational study shows that the boundary layer (BL) over this region was well mixed and topped by a thin and non-drizzling Sc layer on days synoptically-quiescent with little variability between this region and the coast. The surface wind, the surface fluxes and the BL turbulence appeared to be weaker than those over other ocean regions where stratocumulus clouds exist. The weaker turbulence in the BL may contribute to a relatively low entrainment rate calculated from the near cloud top fluxes. This in-situ data set can help us better understand cloud processes within this coastal regime, and also be valuable for the calibration of the satellite retrievals and the evaluation of numerical models operating at a variety of scales. A strong positive correlation between the liquid water path (LWP) and the cloud condensation nuclei (CCN) was observed under similar boundary layer conditions. This correlation cannot be explained by some of the hypotheses based on previous modeling studies. The satellite retrievals obtained upstream one day prior to the flight observations reveal some sign that the clouds under the high CCN concentrations have minimal LWP loss due to precipitation suppression effects. The results from large eddy simulations with a two-momentum bulk microphysics scheme under different idealized environment scenarios based on aircraft observations indicate that 1) the simulated Sc responds more quickly to changes in large-scale subsidence than to those changes in surface fluxes, free-tropospheric humidity, and the BL-top stability; 2) large-scale vertical wind shear clearly induces cloud-top mixing and enhances entrainment rate; 3) the solar radiation could weaken the BL turbulence, reduce the entrainment rate and decouple the BL; and 4) the impact of the reduced cloud sedimentation due to increasing aerosol on the cloud is small.
Book Synopsis Observational and Modeling Studies of Collision-coalescence in Marine Stratocumulus by : Mikael K. Witte
Download or read book Observational and Modeling Studies of Collision-coalescence in Marine Stratocumulus written by Mikael K. Witte and published by . This book was released on 2016 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: The third goal of the research presented herein is to implement a high spectral resolution bin microphysics scheme in a large eddy simulation (LES) model. The high resolution scheme is validated by comparison with simulations using the default spectral resolution. Considerable differences in microphysical structure and planetary boundary layer turbulence are found when collision coalescence is active due to artificial acceleration of the process at the default resolution, which causes higher concentrations at large drop sizes than in the high resolution configuration.
Book Synopsis Large-eddy Simulation of Stably Stratified Atmospheric Boundary Layer Turbulence by : Sukanta Basu
Download or read book Large-eddy Simulation of Stably Stratified Atmospheric Boundary Layer Turbulence written by Sukanta Basu and published by . This book was released on 2004 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
