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David A. Randall (Colorado State University) |
May. 21, 2008 |
The Role of Moisture in the Madden-Julian Oscillation
(65 minutes)
Randall's group has been using a superparameterized version of the
Community Atmosphere Model (CAM) to study the Madden-Julian Oscillation. Comparing results to both observations and results from the conventional CAM, he presents an analysis of the processes that give rise to the MJO in the Super-CAM model.
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NCAR & UCAR News Center |
May. 19, 2008 |
Bluefire Supercomputer - Multimedia Gallery
(videos and illustrations)
NCAR has taken delivery of a new IBM supercomputer that will advance research into severe weather and the future of Earth's climate. The supercomputer, a Power 575 Hydro-Cluster, is the first in a highly energy-efficient class of machines to be shipped anywhere in the world.
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Akira Kasahara (CGD) |
Aug. 08, 2007 |
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Bette Otto-Bliesner (CGD), Akira Kasahara (CGD), John Kutzbach (University of Wisconsin), Warren M. Washington (CGD) |
Aug. 08, 2007 |
Panel on the Evolution of Climate Modeling
(36 minutes)
Talk 6 of 15 on Day 1 of the Warren Washington Symposium on Climate Modeling, Prediction, and Science Policy. Discussion on the evolution of climate modeling.
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Gerald A. Meehl (CGD) |
Aug. 08, 2007 |
Climate Change Modeling: Past, Present, Future
(22 minutes)
Talk 9 of 15 on Day 1 of the Warren Washington Symposium on Climate Modeling, Prediction, and Science Policy. Meehl traces the development of climate change modeling from the late 1970s to the present. The challenge in the future will be to use coupled climate models to quantify time-evolving regional climate changes to which human societies will have to adapt.
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John Drake (Oak Ridge National Lab) |
Aug. 08, 2007 |
Tribute to Dr. Warren Washington: The Lure of Computation and Modeling
(15 minutes)
Talk 10 of 15 on Day 1 of the Warren Washington Symposium on Climate Modeling, Prediction, and Science Policy. Drake begins with the connection between increasing computational power and weather and climate modeling. He discusses the development of climate modeling and future directions including the challenge of predicting local effects of global warming on short- and long-range time scales.
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Warren M. Washington (CGD) |
Aug. 08, 2007 |
Climate Modeling, Climate Change Prediction, and Science Policy
(47 minutes)
Talk 15 of 15 on Day 1 of the Warren Washington Symposium on Climate Modeling, Prediction, and Science Policy. Washington interweaves his own development as a scientist and the development of climate modeling. He then turns to science policy and its importance in the face of climate change.
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NCAR & UCAR News Center |
May. 28, 2007 |
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Richard Neale (CGD) |
May. 01, 2007 |
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Padma Raghavan (Pennsylvania State University) |
Mar. 23, 2007 |
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Ron Brightwell (Sandia National Laboratories) |
Feb. 23, 2007 |
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Tim Killeen (NCAR), Al Kellie (CISL), Krista Laursen (NCAR), Jeff Reaves (UCAR) |
Jan. 31, 2007 |
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Douglas Nychka (IMAGe) |
Nov. 11, 2005 |
The Ensemble Kalman Filter: The Movie
(49 minutes)
This talk focuses on the update steps of the data assimilation cycle and mentions the DART (Data Assimilation Research Testbed) home page, which offers tutorials.
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Dale Barker (MMM) |
Jul. 28, 2005 |
WRF-Var Background Error Generation
(25 minutes)
Talk 19 of 19. The presenter explains the gen-be utility to calculate local background error statistics, which is the subject of most user questions about the Weather Research and Forecasting Model's WRF-Var algorithm.
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Dale Barker (MMM) |
Jul. 28, 2005 |
The WRF-Var System
(45 minutes)
Talk 16 of 19. The steps involved (including tips) in running the WRF-Var software application are explained. Cold-start mode and cycling mode are discussed.
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Dale Barker (MMM) |
Jul. 28, 2005 |
Variational Data Assimilation System (WRF-Var) Overview
(59 minutes)
Talk 15 of 19. This talk introduces a variational data assimilation system for the Weather Research and Forecasting model (WRF). Topics include the WRF-Var algorithm, background error modeling, FGAT (first guess at appropriate time), radar reflectivity, the gen_be utility to calculate local background error statistics, and global 3D-Var capabilities.
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Wei Huang (MMM) |
Jul. 28, 2005 |
Tutorial Notes: WRF-Var Software 2.1
(25 minutes)
Talk 18 of 19. This talk reviews the software, data structures, and registry of WRF-Var, supplementing the material in talks 13 and 14 (Tutorial Notes: WRF Software 2.1). The presenter discusses how to adapt code to take advantage of local computing resources.
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Yong-Run Guo (MMM) |
Jul. 28, 2005 |
How to Get Observations for WRF-Var
(22 minutes)
Talk 17 of 19. This talk reviews the data formats that are supported by WRF-Var for the observations file, the BUFR, ASCII (MM5/LITTLE_R), and Radar OBS (radial velocity and reflectivity) format. The steps needed to run the OBS preprocessor are explained.
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John Michalakes (MMM) |
Jul. 27, 2005 |
Tutorial Notes: WRF Software 2.1 (Part 2 of 2)
(35 minutes)
Talk 14 of 19. This is the second half of the software talk for WRF. The registry is discussed, which is an active data dictionary database that allows users to manipulate state data and add a variable to the model. The presenter shows several examples.
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John Michalakes (MMM) |
Jul. 27, 2005 |
Tutorial Notes: WRF Software 2.1
(88 minutes)
Talk 13 of 19. This is the first half of a talk on the development of the Weather Research and Forecasting Model (WRF). It highlights the key software design features and also discusses computer platforms currently supported, enhancements, and the use of domain decomposition to divide the work between multiple parallel processors.
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Cindy Bruyere (MMM) |
Jul. 27, 2005 |
WRF Post-Processing
(87 minutes)
Talk 12 of 19. This talk presents netCDF (network Common Data Form), the major output format for WRF, and the four graphical tools supported by NCAR: NCL (NCAR Command Language), RIP4 (Read/Interpolate/Plot), GrADS (Grid Analysis and Display System), and Vis5D.
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Dave Gill (MMM) |
Jul. 26, 2005 |
How to Set Up and Run WRF for One-Way and Two-Way Nesting
(39 minutes)
Talk 11 of 19. This talk describes nesting, a horizontal mesh refinement capability in WRF. The presenter discusses feedback from the child domain to the parent domain, lateral boundary conditions, and the ndown program.
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Wei Wang (MMM) |
Jul. 26, 2005 |
How to Set Up and Run WRF (real.exe & wrf.exe)
(78 minutes)
Talk 10 of 19. This talk explains how to download, compile, and run the WRF model, including real.exe and wrf.exe. The presenter discusses input and output files, checking output, and the WRF namelist runtime options.
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Jimy Dudhia (MMM) |
Jul. 26, 2005 |
WRF Physics Options Part II
(35 minutes)
Talk 9 of 19. This is the second half of a talk explaining how to set physics options in the WRF model using the appropriate namelist variables. The presenter discusses cumulus parameterization and microphysics.
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Dave Gill (MMM) |
Jul. 25, 2005 |
Real Data Initialization
(30 minutes)
Talk 7 of 19. This talk discusses the steps necessary to build the initial conditions and lateral boundary conditions for the WRF model. The presenter explains how to edit the namelist file to change runtime options.
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Wei Wang (MMM) |
Jul. 25, 2005 |
WRF Standard Initialization Runtime Options
(11 minutes)
Talk 6 of 19. This talk presents components of the WRF SI (Standard Initialization) program, including namelist file, project_id, filetimespec, hridspec, sfcfiles, interp_control, and si_paths. Tips are given on running the model and diagnosing runtime problems.
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Wei Wang (MMM) |
Jul. 25, 2005 |
WRF Standard Initialization
(58 minutes)
Talk 2 of 19. This talk describes how the WRF SI (Standard Initialization) program initializes the model using real meteorological data rather than idealized data. The function of SI program components, including gridgen_model, grib_prep, hinterp, and vinterp, is explained.
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Jimy Dudhia (MMM) |
Jul. 25, 2005 |
WRF Physics Options Part I
(44 minutes)
Talk 8 of 19. This is the first half of a talk that explains how to set physics options in the WRF model using the appropriate namelist variables. This part of the talk covers turbulence/diffusion, radiation (longwave and shortwave), surface (surface layer and land/water surface), and PBL (planetary boundary layer) scheme options.
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Jimy Dudhia (MMM) |
Jul. 25, 2005 |
WRF Modeling System V2.1 Overview
(12 minutes)
Talk 1 of 19. This is the introductory talk for the 2005 Summer Weather Research and Forecasting Model Tutorial. The presenter gives an overview of the topics that will be covered in the talks, including ARW (Advanced Research WRF), physics in WRF, SI (Standard Initialization), 3DVar (3D variational data assimilation), supported data types, software requirements, portability, and user support.
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Paula McCaslin (NOAA) |
Jul. 25, 2005 |
Setting Up and Running the WRF Standard Initialization
(59 minutes)
Talk 5 of 19. This talk discusses standard initialization in WRF. The presenter explains SI capabilities, source code, system requirements, installation, configuring domains, configuring interpolation, and initializing and running the WRF model. She also describes grib_prep.pl and wrfprep.pl scripts.
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William Skamarock (MMM) |
Jul. 25, 2005 |
Initialization for Idealized Cases
(34 minutes)
Talk 4 of 19. This talk explains that idealized cases included in WRF are the easiest to run and can ensure that the model is running properly on the user's platform. The presenter discusses several test cases, including 2D squall line simulation, 3D supercell simulation, and 2D gravity currents.
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William Skamarock (MMM) |
Jul. 25, 2005 |
The Advanced Research WRF (ARW) Dynamics Solver
(61 minutes)
Talk 3 of 19. This talk gives an overview of the main features of the ARW problem solver, including terrain representation, vertical coordinate, equations and variables, grid staggering, time integration scheme, advection scheme, time step parameters, filters, boundary conditions, nesting, and map projections.
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