Instructor
Raymond W. Arritt
email: wxpred@gmail.com
3009 Agronomy Hall
phone: 515-294-9870
Office Hours: By appointment (usually you can just drop by)
Teaching assistant
Taleena Sines
3019 Agronomy Hall
This course will give students a basic familiarity with numerical models including numerical solution methods for the atmospheric govening equations, parameterizations for physical processes that cannot be represented explicitly, and the design of modeling experiments. The class will be informal and will include many in-class exercises. Since class meetings often will be spent largely in working problems that apply principles learned in the course, it is important to read the assigned material for each date before the start of class so that you are prepared to solve any in-class problems for that day.
We can modify the course to fit student needs and interests. If there are any specific topics you would like to cover please let me know as soon as possible. (You are not limited to topics in the textbook.) I will try to find a way to fit these topics into the course where appropriate.
Students in this course are strongly urged to enroll concurrently in AGRON 590 A2, "Research Tools." That course will give you practical skills that we will not cover here.
Textbook: T.T. Warner, Numerical Weather and Climate Prediction. Cambridge University Press, ISBN: 978-0521513890. This textbook is available from various online booksellers.
You should also have access to a textbook on atmospheric dynamics, such as the widely used textbook by Holton.
The texbook will be supplemented with online reading and journal articles. Be sure you know how to log in to the ISU Library web site so that you can get access to articles that require subscriptions.
I want you to be able to do your best. If you have a disability and need accommodations in this course, please contact me within the first two weeks of the semester or as soon as you become aware of your need. Before meeting with me, you will need to obtain a SAAR form with recommendations for accommodations from the Disability Resources Office. Their telephone number is 515-294-7220 or email disabilityresources@iastate.edu. Retroactive requests for accommodations, or requests made less than one week before the situation requiring accommodation, will not be honored.
This class will follow standard ISU policies on topics such as academic dishonesty, harassment and discrimination, and religious accommodations. See here for details.
15% - Mid-term exam
35% - Assignments (homework, class presentations, other assignments).
35% - Semester project. Each student will design and complete a project in which they develop or modify a numerical model. That is, the project must be hands-on and may not be a literature review or similar. You will present results from your project in a written manuscript, and in an oral presentation in a format similar to an American Meteorological Society or American Geophysical Union conference.
15% - Final exam
The course schedule will be adjusted as needed in light of student interests and time needed to cover each topic. It will be revised to keep track of what we have done during the term.
Date | Topic | Reading | Due today |
Tues 8/26 |
Introduction: why do we do numerical modeling? Student input on course focus and topics. The primitive equations. | Warner, chapters 1 and 2. | Read this syllabus, including the material on your semester project. Order the textbook. |
Thur 8/28 | Reynolds averaging. Simiplifications and approximations applied to the primitive equations. | ||
Tues 9/2 |
The shallow water model. Discretization of the primitive equations. | Warner, chapter 3.1, 3.2. | Homework 1 |
Thur 9/4 |
Finite difference methods. Map projections (start). | Warner, chapter 3.3. | |
Tues 9/9 |
Map projections (finish). Considerations for vertical resolution.
Link to notes.. |
Warner, chapter 3.4.1. | |
Thur 9/11 |
Spectral methods. | Warner, chapter 3.2.2. | Semester project proposals due |
Tues 9/16 |
Time differencing. Introduction to numerical stability. | Warner, chapter 3.3.1, 3.4. |
Recommendations for map projection (link - see final slide). |
Thur 9/18 |
Numerical stability of the Coriolis terms. | Warner, chapter 3.4. | |
Tues 9/23 |
Introduction to implicit methods. Numerical stability of advection schemes. | Homework 2: Time differencing
Also email a copy of your computer program or spreadsheet to wxpred@gmail.com |
|
Thur 9/25 |
Advection schemes. Order of accuracy. | Warner, chapter 3.4.1. | |
Tues 9/30 |
Vertical coordinates. Staggered grids. | Warner, chapter 3.4.8, 3.3.2. | |
Thur 10/2 |
Physical parameterizations: Microphysics
Kessler warm rain microphysics Haifan Yan Zhao and Carr (1997) scheme Sean Stelton Tiedtke scheme Ariele Daniel |
Warner, chapter 4.1, 4.2 | Student presentations on microphysics schemes. |
Tues 10/7 |
Physical parameterizations: Microphysics
Ferrier scheme Renee Walton WSM6 scheme Sarah Fingerle Milbrandt and Yao (2005) multi-moment scheme Brad Carlberg |
Warner, chapter 4.1, 4.2 | Student presentations on microphysics schemes. |
Thur 10/9 |
Physical parameterizations: Convection. Notes. | Warner, chapter 4.3. | |
Tues 10/14 |
Physical parameterizations: Convection. Notes. | Warner, chapter 4.3. | Warner, question 4.6. |
Thur 10/16 |
Midterm exam | ||
Tues 10/21 |
Surface processes | Warner, chapter 5 | |
Thur 10/23 |
Surface processes. Notes. | Warner, chapter 5 | Progress reports due for semester projects. |
Tues 10/28 |
Transpiration. Boundary layer and turbulence. Notes. | Warner, chapter 4.4 | |
Thur 10/30 |
Boundary layer and turbulence | Warner, chapter 4.4 | |
Tues 11/4 |
Ensemble methods | Warner, chapter 7.
Leutbecher, M. and T.N. Palmer, 2008: Ensemble forecasting. Journal of Computational Physics 227, 3515–3539. Plus one other article of your choice on ensemble forecasting. |
Homework: An application of similarity theory. |
Thur 11/6 |
Ensemble methods | ||
Tues 11/11 |
Experimental design | Warner, chapter 10. Stein and Alpert, 1993: Factor separation in numerical simulations.. | Is there a sign error in Warner eq. 10.4? |
Thur 11/13 |
In-class workday for semester projects. | ||
Tues 11/18 |
Verification methods | Warner, chapter 9 | |
Thur 11/20 |
Analyzing model output | Warner, chapter 11 | Written report for semester project due. |
Tues 11/25 |
Thanksgiving break | ||
Thur 11/27 |
Thanksgiving break | ||
Tues 12/2 |
Climate modeling and downscaling.
Project reports returned to students. |
Warner, chapter 16
Guide to notations on reports |
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Thur 12/4 |
Climate modeling and downscaling.
Notes. |
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Tues 12/9 |
Project presentations
Development of a Wind Turbine Rotor Layer WRF Ensemble Forecast Renee Walton Modeling of Late-Season North American Monsoon Precipitation in Arizona and New Mexico Sarah Fingerle Impacts of Different Grid Space Resolutions on Precipitation Forecasts Over Iowa Using WRFARW Model Ariele Daniel |
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Thur 12/11 |
Project presentations
Effects of Convective Scheme Choice on Several Nighttime MCS Simulations Sean Stelten Comparing the Effects that the Ferrier, WSM6, and Morrison Microphysics Schemes Have on Heavy Warm Season Rain Events Brad Carlberg Evaluation of Different Domain Sizes in WRF Model in the Warm Season Heavy Precipitation Cases Haifan Yan |
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Tues
12/16 9:45-11:45 a.m. |
Final exam |