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Courses > Spring 2006 AT730 - Mesoscale Modeling, 3 Credits Location: Room 212B, ACRC; 12:00 - 3:00, Wednesdays NOTE: The first class will be held on Friday, January 27th from 9:20 AM - 11 AM in 100 Atmospheric Science. The previously scheduled date of January 25th is incorrect.
Required Text MESOSCALE METEOROLOGICAL MODELING by Roger A. Pielke Sr.
Hardcover - 676 pages 2nd Edition 2002 A message from Dr. Pielke:
Date: Fri,
13 Jan 2006 13:41:21 -0700 (MST) Hi All, As
a P.S. to what Dallas has sent out, our regular class times will be Wednesdays
from noon to 3pm with a break at the middle. There will be no class the
18th (which we will make up), and the class on Jan 25th needed to be moved
to Friday the 27th at 9am-11am due to a conflict with a conference in
Boulder. This time was selected after polling the students who had registered,
but several of you have added later. For those, please The regular Wed class time will begin on Feb 1. Please visit the class website for the first reading assignment. I look forward to meeting all of you! Roger P. Date: Fri,
27 Jan 2006 16:08:55 -0700 (MST) Hi AT 730 For Wednesday,
we will continue discussing Chapter 4 and start Chapter 5. Please ask
questions as needed, as I would like to have a discussion on Also, Dallas will be posting several typographical corrections (Thanks Erica!) on the book url location /publications/errata.pdf. Please let Dallas and I know when you find more. A reading assignment for Wednesday is to read Pielke, R.A. Sr., and R.W. Arritt, 1984: A proposal to standardize models. Bull. Amer. Meteor. Soc., 65, 10, 1082. http://blue.atmos.colostate.edu/publications/pdf/NT-12.pdf Also, Pielke, R.A., L.R. Bernardet, P.J. Fitzpatrick. S.C. Gillies, R.F. Hertenstein, A.S. Jones, X. Lin, J.E. Nachamkin, U.S. Nair, J.M. Papineau, G.S. Poulos, M.H. Savoie, and P.L. Vidale, 1995: Standardized test to evaluate numerical weather prediction algorithms. Bull. Amer. Meteor. Soc., 76, 46-48. http://blue.atmos.colostate.edu/publications/pdf/R-156.pdf This material will be referred to in the presentation of Chapter 10. Roger Date: Sat,
28 Jan 2006 16:21:01 -0700 (MST) Hi AT 730, There are two more corrections that Erica has found in the text. These are: 1. On page 17, the header at the top of the page should be "2.4 Conservation of Water". 2. On page 15, in the two equations in the middle of the page, the term that multiplies the second derivative in the Taylor expansion is delta x, not a partial derivative. Dallas will also post these corrections on the web page.
Roger Date: Mon,
30 Jan 2006 09:03:33 -0700 (MST) Subject: Re: equation 4-14 (fwd) Erica found an error in Eq. 4-14 in the book. In equation 4-14 in the 2nd term on the RHS, there is a u_o". It should be u_i". We will add it to our errata list. thanks Erica! dallas
Hi AT 730, On Wednesday, we will continue to discuss Chapter 5. Please come with questions, if needed. The paper I mentioned today regarding overlap in scales of applicability between numerical and physical modeling is: Avissar, R., M.D. Moran, R.A. Pielke, G. Wu, and R.N. Meroney, 1990: Operating ranges of mesoscale numerical models and meteorological wind tunnels for the simulation of sea and land breezes. Bound.-Layer Meteor., Special Anniversary Issue, Golden Jubilee, 50, 227-275. http://blue.atmos.colostate.edu/publications/pdf/R-89.pdf See Figures 12 and 14, for example, for the overlap region between the two approaches and for a proposed application. We will discuss this paper in class on Wednesday. As I mentioned, I will be traveling from a talk in Denver that morning, so class will begin at 115pm. Please also e-mail me if you have any questions about what we have covered in the text so far. Roger P.
Date: Thu,
2 Feb 2006 08:23:48 -0700 (MST)
and Pielke Sr., R.A., T. Matsui, G. Leoncini, T. Nobis, U. Nair, E. Lu, J. Eastman, S. Kumar, C. Peters-Lidard, Y. Tian, and R. Walko, 2005: A new paradigm for parameterizations in numerical weather prediction and other atmospheric models. National Wea. Digest, in press. http://blue.atmos.colostate.edu/publications/pdf/R-296.pdf
We will be discussing
in class. Roger P. Date: Thu,
2 Feb 2006 13:18:29 -0700 (MST)
1. Jih-Wang Wang: the Grell convection parameterization 2. David Stokowski; the Mahrer-Pielke radiation parameterization. Please send me your selected one soon (or contact me to discuss). Roger P.
Date: Tue,
7 Feb 2006 16:20:06 -0700 (MST)
Date: Thu,
9 Feb 2006 10:31:28 -0700 (MST) Hi AT 730, As we discussed yesterday, I would like you to program the forward, upstream differencing scheme (Eq. 10-13) and assess the amplitude and phase change per time step for C=0.1; 0.5 and 0.9 for 2, 4, 10 and 20 delta-x wavelengths. Use cyclic boundary conditions. Compare with the values in Table 10-1 (which were computed analytically). The values that you compute should be identical. Use whatever method that permits you to make this quantitative comparison. On Wednesday, Feb 15, we will continue Chapter 10. Also, there will be no class on March 8. I would like to have a make-up class on Friday March 3rd. Please let me know times during that day that you cannot make it. Roger P. Date: Thu,
9 Feb 2006 10:26:01 -0700 (MST)
Date: Thu,
9 Feb 2006 12:14:55 -0700 (MST)
Date: Fri,
10 Feb 2006 11:01:35 -0700 (MST) Hi AT 730, After receiving feedback, the AT 730 make up class will be held on March 3rd (since there will be no class on March 8) from 10 am-1230 pm. Dallas will send out a room number for it. We will have a break, if needed. Roger P. PS - Class will be held in the CIRA South (large) Conference Room
Date: Fri,
10 Feb 2006 11:49:45 -0700 (MST) Subject: project Hi AT 730, Another parameterization project has been added: Russ Schumacher: Lin et al warm cloud microphysics parameterization. Roger P.
Date: Mon,
13 Feb 2006 14:25:30 -0700 (MST) Hi AT 730, Dr. Leighton Cochran of CCP has graciously agreed to have the class visit CCP on March 8 at noon. Dallas will send out directions, and meet you there. This will be a very informative presentation and tour by an internationally outstanding wind tunnel modeling group. Roger P. P.S. See http://www.cppwind.com/cppmap.htm for a map to CCP Wind Engineering. Visit their website at http://www.cppwind.com/ to learn about their interesting research and facilities. We can meet at the Department to carpool to their facility. We will meet at 11:40 in the parking lot. Don't be late! Email dallas@atmos.colostate.edu if you want to volunteer to drive.
Date: Fri,
17 Feb 2006 07:18:57 -0700 (MST) Hi AT 730, As assigned in class on Wednesday, please perform an analysis of the leap frog-centered in space approximation of the advection in the same manner as with the forward upstream scheme. This will be more difficult as you need to properly start the integration (hint: use the analytic known solution). On comparing the analytic solution (which is in the book) with the coded (numerical) solution, finding the value of lambda and phase is sufficient. By computing the decay (or in the leap frog scheme the lack of any decay for any wavelength), and the rate of movement of the wave in your numerical results, you can confirm the fidelity of your coding. Questions
to me if not clear! Roger P.
Date: Tue,
21 Feb 2006 09:24:22 -0700 (MST)
Date: Wed,
22 Feb 2006 09:40:04 -0700 (MST)
Roger P.
"2"> Date: Wed, 22 Feb 2006 17:08:07 -0700 (MST) From: Roger Pielke <pielke@atmos.colostate.edu> Subject:
Wed March 1 2006 class
Date: Wed,
22 Feb 2006 17:10:21 -0700 (MST) Hi AT 730, Here is the poster. Shen et al., 2005: Hurricane forecasts with a global mesoscale resolving model on the NASA Columbia Supercomputer preliminary simulations of Hurricane Katrina (2005). AGU poster. Roger P.
Date: Wed,
22 Feb 2006 17:11:51 -0700 (MST)
Roger
Date: Sat,
25 Feb 2006 14:12:29 -0700 (MST)
1. numerical
form and stability analysis of advection Roger
Date: Sun,
26 Feb 2006 14:23:35 -0700 (MST)
Date: Mon,
27 Feb 2006 15:45:36 -0700 (MST) 1. A written description of the advection schemes and how you programmed them up. You may want to include your code. 2. Description of how the phase and amplitude errors were calculated. In particular, you should pay particular detail to the first since it is more difficult. Then discuss why the results you obtain numerically may differ from the results in Table 10-1. 3. Discuss
the broader physical significance of the results and anything else you
learned from doing the exercise. --Chris
Date: Mon,
27 Feb 2006 20:42:58 -0700 (MST) The reason
to assess WRF is due to its increasingly high profile in the weather modeling
community. WRF is an emerging topic. It also provides a framework that
will permit you to evaluate any model. We will discuss further on Wednesday.
Roger
P.
Date: Wed,
1 Mar 2006 13:08:57 -0700 Hi AT 730, Here's the pdf of the WRF documentation. I haven't looked at it too closely, but it contains a lot of information on WRF. Erica ------------------------------------------------
Date: Fri,
3 Mar 2006 11:52:04 -0700 (MST) For the WRF work, as agreed today, please send to Dallas for posting the specific terms that you will be assessing and presenting briefly to class. She will compile the list for the class website. We will plan for presentations on April 5, so you have time to complete. On March 22, let us know your progress on your class projects (sending e-mails to the class list is okay). Finally, I would like to see if we can have the class for the week of March 27th on Monday instead of Wednesday. Would Monday morning (sometime in the period 8am - 1pm NOT work for anyone?). Roger P. Date: Wed,
15 Mar 2006 07:46:06 -0700 (MST)
I hope you are enjoying Spring Break! Here are two papers that might be of interest. Roger P. Anquetin et al. 2005: The 8 and 9 September 2002 flash flood even in France: a model intercomparison. Natural Hazards and Earth System Sciences, 4, 1-14. PDF Meneguzzo et al. 2004: Sensitivity of meteorological high-resolution numerical simulations of the biggest floods occurred over the Arno river basic, Italy, in the 20th century. J. Hydrology, 288, 37-56. PDF
Date: Thu,
16 Mar 2006 08:36:27 -0700 (MST)
Date: Mon,
20 Mar 2006 04:30:37 -0700 (MST)
Details on Hydrology Days can be found at: http://hydrologydays.colostate.edu/ http://hydrologydays.colostate.edu/schedule_06.htm See all of you Wednesday. Roger P.
Date: Mon,
20 Mar 2006 12:38:54 -0700 (MST)
http://hydrologydays.colostate.edu/Abstracts_06/Bras_abs.pdf http://hydrologydays.colostate.edu/schedule_06.htm
It promises
to be an informative lecture. Roger P. Date: Mon,
20 Mar 2006 18:29:00 -0700 (MST)
We will also discuss when your class projects should be presented. The current plan is to make the presentations on April 26. Plan for a 15 minute talk. Your powerpoint slides will serve as your "paper". Roger P.
Date: Thu,
23 Mar 2006 07:33:06 -0700 (MST) Subject:
Class Wed March 29 On corrections to the book, two more are listed below. Dallas will add to the errata list on the website. 1. In equation 6-5, there is an equal sign before the del operator (right after x tilde superscript j). 2. In equation 6-70, there is no comma between u tilde superscript 1 and the partial derivative term of u tilde superscript 1 with respect to x tilde superscript 1. Please let me know if these corrections are not clear to you. Roger P.
Date: Thu,
23 Mar 2006 13:57:45 -0700 (MST)
Date: Mon,
27 Mar 2006 12:26:45 -0700 (MST)
Date: Mon,
27 Mar 2006 13:49:56 -0700 (MST) Hi AT 730,
There is a typo on page 231. The subscript to beta should be sub "a"
not sub "q". Roger Date: Thu,
30 Mar 2006 09:44:30 -0700 (MST) Hi AT 730,
For Wednesday's class (April 5), we will start with the WRF talks. Then
continue into Chapter 9. Please bring questions/comments as you would
like on any topic we have covered so far. Roger
P. Date: Thu,
30 Mar 2006 10:21:24 -0700 (MST) Hi AT 730, An excellent question has been asked on the relative importance of the higher order terms in turbulence. We will also discuss this issue Wednesday. To prepare, please read pages 202-225, 461-463 and 469-471 in Stull "An Introduction to Boundary Layer Meterology" (Kluwer Academic Publishers). A copy of this book should be in the libray (please do not check out but copy the pages, so others can obtain the text). Roger P.
Date: Tue, 4 Apr 2006 12:17:09 -0600 (MDT) From: Roger Pielke <pielke@atmos.colostate.edu> Subject: Cumulus Parameterization
The paper
raises the issue as to whether the "superparameterization approach"
or the "look-up table" approach is more feasible. Please be
prepared to discuss when we come to this topic. Roger
P. Arakawa, A., 2004: The cumulus parameterization problem: Past, present, and future. J. Climate, 17, 2493-2524. PDF
April 4, 2006 View the figures provided by Norman Wood, Colorado State University PDF These figures will be discussed in class on Wednesday, April 5, 2006.
Date:
Wed, 5 Apr 2006 14:43:49 -0600 (MDT)
For our next class, Dr. Castro has agreed to present. He has very valuable expertise in the two topics he will be discussing, which we will all learn from. The class will start at 1pm. If we have
time, we then will start a discussion on the Arakawa paper that is listed
on the web site. The framework will be on the relative value of For the April
19th, we will discuss Chapter 9 in the book. Please send any topics (papers)
that you would like to also discuss, which we have not yet.
Roger P. Date:
Wed, 05 Apr 2006 14:55:26 -0600 The first half of the Arakawa paper also has a very nice discussion about the philosophy and history of convective parameterizations and goes through some of the conventional approaches (e.g., convective adjustment, Kuo, Arakwa-Schubert). It should be a good lead-in to Chris's talk as well. John Date: Wed, 05 Apr 2006 15:03:50 -0600 Subject: papers For anyone who may be interested in the kinetic energy spectrum/effective resolution issues, I would recommend checking out the following page: http://www.mmm.ucar.edu/people/skamarock/spectra_discussion.html The paper I referenced in my talk today is linked there, as is an interesting "white paper" regarding model diffusion. Russ
Date: Wed,
5 Apr 2006 17:48:08 -0600 (MDT)
Kain, J.S., 2004. The Kain-Fritsch Convective Parameterization: An Update. J. Appl. Meteor., 43, 170-181. PDF Kain, J.S.,
and J.M. Fritsch, 1993. Convective parameterization for mesoscale models:
The Kain-Fritsch scheme. The Representation of Cumulus **This reference is kind of obscure. You'll have to go to the library to get it. Or I have it in my files if you want a copy.
Castro, Christopher
Lawrence, 2005, Ph.D. Dissertation: Investigation of the summer climate
of North America: A regional atmospheric modeling study. Department of
Atmospheric Science, Colorado State University, 210 pp. Castro, C.L., R.A. Pielke Sr., and G. Leoncini, 2005: Dynamical downscaling: Assessment of value retained and added using the Regional Atmospheric Modeling System (RAMS). J. Geophys. Res. - Atmospheres, 110, No. D5, D05108, doi:10.1029/2004JD004721. http://blue.atmos.colostate.edu/publications/pdf/R-276.pdf
--Chris What is Convective Parameterization? PDF
Date: Tue,
11 Apr 2006 15:01:37 -0600 (MDT) Subject: Wednesday April 12th class Hi All, Two reminders for tomorrow. Class starts at 1 pm and Dr. Castro will be presenting. See you there! Roger Date: Wed,
12 Apr 2006 15:05:01 -0600 (MDT) Subject: Convective parameterization handout
http://meted.ucar.edu/comm_highered/cuparm.ppt www.comet.ucar.edu/class/comap_symposium/07_Mar27_2000/docs/kain/kain002.ppt
Date: Wed, 12 Apr 2006 15:41:20 -0600 (MDT) From: Roger Pielke <pielke@atmos.colostate.edu> Subject: Class
Date: Wed,
19 Apr 2006 09:46:53 -0600 (MDT)
For the class next week, the class projects will be presented, and a class wrap-up will be done.
See you at noon today. Roger P. Date: Wed,
19 Apr 2006 16:53:26 -0600 (MDT)
Date: Fri,
21 Apr 2006 17:02:21 -0600 (MDT)
Hi AT 730, This seminar is very relevant to our class. Please attend if
you can. Roger P. Date: Mon,
24 Apr 2006 08:03:15 -0600 (MDT)
Hi AT 730, This talk will be a good opportunity to relate to the subject
of parameterizations (LUT as contrasted with the superparameterization Date: Wed,
26 Apr 2006 22:00:44 -0600 (MDT) Hi AT 730,
I want to thank Nick, Russ, Erica, David, and Jih-Wang for five excellent
talks today! As I mentioned, Dallas will post on our website, I will send you grades in the next few days, for those who are taking for credit and have completed all the assignments. Best wishes
in the continued pursuit of your advanced degree! Roger P. Date: Thu,
27 Apr 2006 09:01:32 -0600 (MDT) As a follow
on to Roger's comment, I also enjoyed the class as well and hope I have
the same caliber of students when I teach the course myself. If I don't see you before I leave for my position at Arizona, I wish you all well in graduate endevours and hope the course was helpful. My door will certainly be open in Tucson if I can be of help in your research. I am sure Roger would say the same when he goes to Boulder this summer. Best wishes.
--Chris WRF PRESENTATIONS - April 5, 2006:
PARAMETERIZATION PROJECTS - April 26, 2006:
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