Talk:Atmospheric dispersion modeling

message: This page was developed by renaming and manually moving Dispersion modeling of air pollutants at the request of User:Anlace. I also changed all the pages linked or redirected to the old page to this renamed page so that they now link or redirect to this renamed page.
However, I do not know how to move the history of the old page and, thus, the history remains with the old page, namely Dispersion modeling of air pollutants. If anyone knows how to do that, please do so. - mbeychok 04:10, 22 February 2006 (UTC)
thread_title: How do I move history to this renamed page?

message: I think there should be an explicit note about grid point models and maybe also something about urban dispersion modelling (street canyons etc.). Some details about gaussian models presented here could be moved into specialised article. --Vladimír Fuka 20:25, 10 September 2006 (UTC)
replies: text: Vladimir, I agree that there are a great many types of dispersion models in use today.  And I think that the major types do indeed deserve to have articles written about them. However, as I said in response to NHSavage (see above), this article was written to explain the fundamentals of the classic Gaussian dispersion algorithm and the classic Brigg's plume rise calculations. If we tried to include discussions of all the various modern dispersion models in use today, this article would become much, much too large.  Rather than that, I think it would be much more useful if you (or anyone else) would write separate new articles about the other types of models. Is that something you would be willing to do? - mbeychok 23:49, 10 September 2006 (UTC)
replies: text: Well, now i have not enough free time now, because i'm preparing for finals in meteorology. Then i can try write something, but i don't feel to be much competent. But again, if the name of article is Atmospheric dispersion modeling, there should be at the beginning short info about all possibilities. At least a short list or simple mention. Also there could be a separate article Gaussian dispersion models with more details about Sutton model etc. which can not be all in this introductional article.--Vladimír Fuka 15:07, 20 September 2006 (UTC)
replies: text: Vladimer, good luck on your finals. As for mention of other models, the "See also" list in this article includes the article Compilation of atmospheric dispersion models which has descriptions of dozens of other models of various different types. The purpose of having a "See also" section is to do just what you are asking for ... a simple mention of other model types and other related articles ... is it not?? In my mind, there is no point of a short list of other models in this article when there is already an existing article with a very long list and description of other models. Regards, - mbeychok 15:27, 20 September 2006 (UTC)
thread_title: Mention of other models

message: I notice that the article starts with a description on how Atmospheric dispersion modeling is done, not what it is. Could you please start the very first sentence by defining the subject clearly, including its purpose?
Regards,Jens Nielsen 09:41, 24 March 2006 (UTC)
replies: text: Thanks for your suggestion.  I have revised the opening paragraph. - mbeychok 17:00, 24 March 2006 (UTC)
thread_title:  define subject in first line please. 

message: The CALINE and the OCD models, along with dozens of other worldwide individual models, are listed and briefly described in the Compilation of atmospheric dispersion models article which is listed in the "See also" section. So there is no point of listing any of the individual models in the "See also" section  unless there is a separate Wiki article about an individual model (such as there is for each of the eight listed individual models). mbeychok 19:50, 18 November 2006 (UTC)
thread_title:  Reason for deleting CALINE and OCD model ''See also'' links 

message: A large observational database of many different atmospheric constituents including radicals from a host of platforms is available. This was created as part of ESA Envisat and NASA Aura validation. It is of general use. Do you think it should be added to the article text? Dlary
:As I explained when I deleted your external link to that observational data base, the link you provided led to a website that I found so difficult to understand that it was virtually incomprehensible. It was obviously written for the cognoscenti ... whereas this dispersion modeling article is no more than an   introduction to the subject. Also, this dispersion modeling article does not include a discussion of atmospheric chemistry. 
:I have a great deal of respect for your very advanced expertise and credentials in the field of atmospheric chemistry. In my opinion, it would be much better if you wrote a separate article on that subject and how it relates to atmospheric pollutant dispersion modeling. Would you be willing to undertake writing such an article? Regards, - mbeychok 06:20, 3 February 2007 (UTC)
thread_title:  Observational Database 

message: I don't understand where the "x" parameter is used in the gaussian equation, as it doesn't appear anywhere. And if the "x" parameter is not in this equation, how to have a concentration in a point of the space (parameters x,y,z) while only 2 parameters (y and z) are used ?
fr:User:FredB —The preceding unsigned comment was added by 82.231.94.9 (talk) 13:45, 11 March 2007 (UTC)
replies: text: Ok I think I have understood : the "x" parameter is used for \sigma_y and \sigma_y. fr:User:FredB —The preceding unsigned comment was added by 82.231.94.9 (talk) 16:24, 11 March 2007 (UTC)
replies: text: Yes, you found the correct answer to your question. - mbeychok 18:54, 11 March 2007 (UTC)

text: If you really believe that the above list is inadequate, I would be happy to create another redirected page entitled "Air dispersal modeling".  However, I strongly believe that the current title of the primary page is the most correct and most precise one. - mbeychok 00:42, 22 February 2006 (UTC)
thread_title:  x parameter in the gaussian equation 

message: Is there a missing "}" at the end of the definition of g3? Fig (talk) 13:38, 14 June 2011 (UTC)
replies: text: Yes, you are right. I have now replaced the missing "}". mbeychok (talk) 19:22, 29 August 2012 (UTC)
thread_title:  Typo? 

message: In the third paragraph, the last sentence reads, "At industrial facilities, this type of consequence assessment or emergency planning is required under the Clean Air Act (United States) (CAA) codified in part 60 of Title 40 of the Code of Federal Regulations."
If you are referring to the Risk Management Plan (RMP) requirements of §112(r) of the Clean Air Act, I believe they are codified at 40 CFR Part 68, not Part 60 (which is New Source Performance Standards under §111).
Regards, BobHerm (talk) 21:55, 10 April 2013 (UTC)
replies: text: You are correct and I have made the change to Part 68. mbeychok (talk) 23:09, 10 April 2013 (UTC)
thread_title:  Incorrect CFR Reference Third Paragraph ? 

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thread_title:  External links modified 

message: The article does not include equations for the atmospheric dispersion parameters, σy and σz. They are dependent on the Pasquill Stability Class and equations for them are below:
σy(x) = exp(Iy + Jyln(x) + Ky[ln(x)]2)
σz(x) = exp(Iz + Jzln(x) + Kz[ln(x)]2)
units of σy, σz, and x are in meters.
Coefficient	A      	B      	C      	D      	E      	F
Ry         	0.443  	0.324  	0.216  	0.141  	0.105  	0.071
ry         	0.894  	0.894  	0.894  	0.894  	0.894  	0.894
Iy         	-1.104 	-1.634 	-2.054 	-2.555 	-2.754 	-3.143
Jy         	0.9878 	1.0350 	1.0231 	1.0423 	1.0106 	1.0148
Ky         	-0.0076	-0.0096	-0.0076	-0.0087	-0.0064	-0.0070
Iz         	4.679  	-1.999 	-2.341 	-3.186 	-3.783 	-4.490
Jz         	-1.7172	0.8752 	0.9477 	1.1737 	1.3010 	1.4024
Kz         	0.2770 	0.0136 	-0.0020	-0.0316	-0.0450	-0.0540
--Snhing (talk) 23:32, 26 April 2017 (UTC)
thread_title:  Atmospheric Dispersion Parameters 

message: The table under "Gaussian air pollutant dispersion equation" contain variables Ry and ry which in p.998 of Seinfeld are used in the alternate derivation σ(x) = Rxr. Since this formula isn't referred to elsewhere in the article, and all the analytical equations are supposed to produce the same coefficients anyways, I removed the two rows.  — Preceding unsigned comment added by 30103db (talk • contribs) 13:07, 6 October 2021 (UTC)
thread_title:  Extra values in table of coefficients 

message: A talk Mizoreoluwa (talk) 02:03, 7 November 2023 (UTC)
thread_title:  Atmospheric dispersion and modelling