Mean State Acceleration Of Cloud Resolving Models And Large Eddy Simulations PDF Download
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Total Pages | : 18 |
Release | : 2015 |
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Download Mean-state Acceleration of Cloud-resolving Models and Large Eddy Simulations Book in PDF, ePub and Kindle
In this study, large eddy simulations and cloud-resolving models (CRMs) are routinely used to simulate boundary layer and deep convective cloud processes, aid in the development of moist physical parameterization for global models, study cloud-climate feedbacks and cloud-aerosol interaction, and as the heart of superparameterized climate models. These models are computationally demanding, placing practical constraints on their use in these applications, especially for long, climate-relevant simulations. In many situations, the horizontal-mean atmospheric structure evolves slowly compared to the turnover time of the most energetic turbulent eddies. We develop a simple scheme to reduce this time scale separation to accelerate the evolution of the mean state. Using this approach we are able to accelerate the model evolution by a factor of 2-16 or more in idealized stratocumulus, shallow and deep cumulus convection without substantial loss of accuracy in simulating mean cloud statistics and their sensitivity to climate change perturbations. As a culminating test, we apply this technique to accelerate the embedded CRMs in the Superparameterized Community Atmosphere Model by a factor of 2, thereby showing that the method is robust and stable to realistic perturbations across spatial and temporal scales typical in a GCM.
Author | : Rachel Atlas |
Publisher | : |
Total Pages | : 61 |
Release | : 2019 |
Genre | : |
ISBN | : |
Download In-situ Observations and Large Eddy Simulations of Southern Ocean Boundary Layer Clouds Book in PDF, ePub and Kindle
Southern Ocean boundary layer clouds affect global albedo and oceanic heat uptake. Most climate models and reanalyses underestimate cloudiness in the Southern Ocean, which biases seas surface temperatures and tropospheric winds, and likely influences the global atmospheric circulation and oceanic heat uptake. This robust and persistent model bias reveals gaps in our understanding of the physical controls on the formation and evolution of low clouds in the Southern Ocean, compared to more well-studied regions. The physics of Southern Ocean boundary layer clouds are uncertain due, in part, to a lack of in-situ observations in the region. Here, I use recent state-of-the-art measurements from the SOCRATES aircraft campaign and cloud resolving simulations, to investigate the influence of synoptic dynamics, boundary layer structure and microphysical properties on Southern Ocean boundary layer clouds. I developed a technique for simulating boundary layer clouds in the synoptically active Southern Ocean with a large eddy simulation (LES) and I set up five modelling case studies from SOCRATES observations. I find that the LES realistically represents diverse boundary layer structures but produces clouds with persistently low liquid water paths. CAM6 persistently underestimates droplet concentrations and cloud driven turbulence.
Author | : Dale R. Durran |
Publisher | : Springer Science & Business Media |
Total Pages | : 476 |
Release | : 2013-03-14 |
Genre | : Mathematics |
ISBN | : 1475730810 |
Download Numerical Methods for Wave Equations in Geophysical Fluid Dynamics Book in PDF, ePub and Kindle
Covering a wide range of techniques, this book describes methods for the solution of partial differential equations which govern wave propagation and are used in modeling atmospheric and oceanic flows. The presentation establishes a concrete link between theory and practice.
Author | : Shouting Gao |
Publisher | : Springer Science & Business Media |
Total Pages | : 213 |
Release | : 2008-04-03 |
Genre | : Science |
ISBN | : 1402082762 |
Download Cloud-Resolving Modeling of Convective Processes Book in PDF, ePub and Kindle
Clouds and cloud systems and their interactions with larger scales of motion, radiation, and the Earth’s surface are extremely important parts of weather and climate systems. Their treatment in weather forecast and climate models is a significant source of errors and uncertainty. As computer power increases, it is beginning to be possible to explicitly resolve cloud and precipitation processes in these models, presenting opportunities for improving precipitation forecasts and larger-scale phenomena such as tropical cyclones which depend critically on cloud and precipitation physics. This book by Professor Shouting Gao of the Institute of Atmospheric Physics in Beijing and Xiaofan Li of NOAA’s National Environmental Satellite Data and Information Services (NESDIS) presents an update and review of results of high-resolution, mostly two-dimensional models of clouds and precipitation and their interactions with larger scales of motion and the Earth’s surface. It provides a thorough description of cloud and precipitation physics, including basic governing equations and related physics, such as phase changes of water, radiation and mixing. Model results are compared with observations from the 1992-93 Tropical Ocean Global Atmosphere Coupled Ocean Atmosphere Response Experiment (TOGA COARE) experiment. The importance of the ocean to tropical convective systems is clearly shown here in the numerical results of simulations with their air-sea coupled modeling system. While the focus is on tropical convection, the methodology and applicability can be extended to cloud and precipitation processes elsewhere. The results described in this well-written book form a solid foundation for future high-resolution model weather forecasts and climate simulations that resolve clouds explicitly in three dimensions—a future that has great promise for the understanding and prediction of weather and climate for the great benefit of society.
Author | : Guy P. Brasseur |
Publisher | : Cambridge University Press |
Total Pages | : 631 |
Release | : 2017-06-19 |
Genre | : Science |
ISBN | : 1108210953 |
Download Modeling of Atmospheric Chemistry Book in PDF, ePub and Kindle
Mathematical modeling of atmospheric composition is a formidable scientific and computational challenge. This comprehensive presentation of the modeling methods used in atmospheric chemistry focuses on both theory and practice, from the fundamental principles behind models, through to their applications in interpreting observations. An encyclopaedic coverage of methods used in atmospheric modeling, including their advantages and disadvantages, makes this a one-stop resource with a large scope. Particular emphasis is given to the mathematical formulation of chemical, radiative, and aerosol processes; advection and turbulent transport; emission and deposition processes; as well as major chapters on model evaluation and inverse modeling. The modeling of atmospheric chemistry is an intrinsically interdisciplinary endeavour, bringing together meteorology, radiative transfer, physical chemistry and biogeochemistry, making the book of value to a broad readership. Introductory chapters and a review of the relevant mathematics make this book instantly accessible to graduate students and researchers in the atmospheric sciences.
Author | : Alexander P. Khain |
Publisher | : Cambridge University Press |
Total Pages | : 643 |
Release | : 2018-07-05 |
Genre | : Nature |
ISBN | : 0521767431 |
Download Physical Processes in Clouds and Cloud Modeling Book in PDF, ePub and Kindle
Provides a comprehensive analysis of modern theories of cloud microphysical processes and their representation in numerical cloud models.
Author | : Eric Garnier |
Publisher | : Springer Science & Business Media |
Total Pages | : 280 |
Release | : 2009-08-11 |
Genre | : Science |
ISBN | : 9048128196 |
Download Large Eddy Simulation for Compressible Flows Book in PDF, ePub and Kindle
This book addresses both the fundamentals and the practical industrial applications of Large Eddy Simulation (LES) in order to bridge the gap between LES research and the growing need to use it in engineering modeling.
Author | : J. R. Garratt |
Publisher | : Cambridge University Press |
Total Pages | : 340 |
Release | : 1994-04-21 |
Genre | : Mathematics |
ISBN | : 9780521467452 |
Download The Atmospheric Boundary Layer Book in PDF, ePub and Kindle
The book gives a comprehensive and lucid account of the science of the atmospheric boundary layer (ABL). There is an emphasis on the application of the ABL to numerical modelling of the climate. The book comprises nine chapters, several appendices (data tables, information sources, physical constants) and an extensive reference list. Chapter 1 serves as an introduction, with chapters 2 and 3 dealing with the development of mean and turbulence equations, and the many scaling laws and theories that are the cornerstone of any serious ABL treatment. Modelling of the ABL is crucially dependent for its realism on the surface boundary conditions, and chapters 4 and 5 deal with aerodynamic and energy considerations, with attention to both dry and wet land surfaces and sea. The structure of the clear-sky, thermally stratified ABL is treated in chapter 6, including the convective and stable cases over homogeneous land, the marine ABL and the internal boundary layer at the coastline. Chapter 7 then extends the discussion to the cloudy ABL. This is seen as particularly relevant, since the extensive stratocumulus regions over the subtropical oceans and stratus regions over the Arctic are now identified as key players in the climate system. Finally, chapters 8 and 9 bring much of the book's material together in a discussion of appropriate ABL and surface parameterization schemes in general circulation models of the atmosphere that are being used for climate simulation.
Author | : Peter Ray |
Publisher | : Springer |
Total Pages | : 803 |
Release | : 2015-03-30 |
Genre | : Science |
ISBN | : 1935704206 |
Download Mesoscale Meteorology and Forecasting Book in PDF, ePub and Kindle
This book is a collection of selected lectures presented at the ‘Intensive Course on Mesoscale Meteorology and Forecasting’ in Boulder, USA, in 1984. It includes mesoscale classifications, observing techniques and systems, internally generated circulations, mesoscale convective systems, externally forced circulations, modeling and short-range forecasting techniques. This is a highly illustrated book and comprehensive work, including extensive bibliographic references. It is aimed at graduates in meteorology and for professionals working in the field.
Author | : Dimokratis G.E. Grigoriadis |
Publisher | : Springer |
Total Pages | : 523 |
Release | : 2017-10-06 |
Genre | : Technology & Engineering |
ISBN | : 3319632124 |
Download Direct and Large-Eddy Simulation X Book in PDF, ePub and Kindle
This book addresses nearly all aspects of the state of the art in LES & DNS of turbulent flows, ranging from flows in biological systems and the environment to external aerodynamics, domestic and centralized energy production, combustion, propulsion as well as applications of industrial interest. Following the advances in increased computational power and efficiency, several contributions are devoted to LES & DNS of challenging applications, mainly in the area of turbomachinery, including flame modeling, combustion processes and aeroacoustics. The book includes work presented at the tenth Workshop on 'Direct and Large-Eddy Simulation' (DLES-10), which was hosted in Cyprus by the University of Cyprus, from May 27 to 29, 2015. The goal of the workshop was to establish a state of the art in DNS, LES and related techniques for the computation and modeling of turbulent and transitional flows. The book is of interest to scientists and engineers, both in the early stages of their career and at a more senior level.