Search found 20 matches

by MarkCohen
May 4th, 2023, 1:43 pm
Forum: Dispersion Model
Topic: Vehicle emissions dispersion
Replies: 3
Views: 15144

Re: Vehicle emissions dispersion

Hi, glad that the earlier response was helpful. Let me try to address your additional questions here. To start, I am considering that 10^4, 10^5, and 10^6 square meters would have characteristic "downwind" lengths of ~100 m, ~300m, and ~1000m, respectively, in thinking about how HYSPLIT might be app...
by MarkCohen
April 12th, 2023, 6:12 pm
Forum: Dispersion Model
Topic: Vehicle emissions dispersion
Replies: 3
Views: 15144

Re: Vehicle emissions dispersion

Hi, thanks for your questions and consideration of HYSPLIT. Part of the answer really depends on what length scale you are looking at. If you are trying to consider impacts close to roadway, e.g., adjacent to the roadway and up to, say, 500 m or so away, then HYSPLIT is not going to be able to provi...
by MarkCohen
June 12th, 2022, 12:11 am
Forum: 1. Installing HYSPLIT
Topic: require registered or Unregistered version of the HYSPLIT?
Replies: 1
Views: 11461

Re: require registered or Unregistered version of the HYSPLIT?

Hi, thank you for this question. You can absolutely use the unregistered version of HYSPLIT for the Workshop. The Workshop can be done with either the unregistered or registered versions.
by MarkCohen
February 17th, 2022, 6:45 pm
Forum: User Applications
Topic: Application of HYSPLIT for tracing flying insects
Replies: 1
Views: 17837

Re: Application of HYSPLIT for tracing flying insects

Hello Juhyeong, Thank you for your interest and your questions regarding the use of HYSPLIT to track insects. I will try to provide a few answers and ideas for you to consider. Most scientists who use HYSPLIT or a similar model to simulate insect dispersal do not treat the insects as a "particle" th...
by MarkCohen
June 18th, 2020, 6:57 pm
Forum: 1. Installing HYSPLIT
Topic: I cannot Run Hysplit after following the installation
Replies: 1
Views: 14658

Re: I cannot Run Hysplit after following the installaction

The problem may be that the shortcut doesn't know where Tcl/Tk is, the program that is required to open the HYSPLIT Graphical User Interface (GUI). In item #5 of the PC Install page in the Tutorial, the following is included: If you downloaded the ARL tcl.zip file, after unzipping the file, let's a...
by MarkCohen
February 28th, 2020, 1:08 pm
Forum: Users
Topic: HYSPLIT vs ALOHA preferred distance from source
Replies: 1
Views: 3065

Re: HYSPLIT vs ALOHA preferred distance from source

The HYSPLIT limitations web page (https://ready.arl.noaa.gov/hypub/limitations.html) has a number of cautions, including the one you mention regarding distances less than 1 km. In the past, HYSPLIT was not recommended for distances less than 1 km from a source because the minimum time step in the HY...
by MarkCohen
November 22nd, 2019, 1:42 pm
Forum: General questions on meteorological data needed for HYSPLIT
Topic: Mixing Height Information and Stability Plots
Replies: 3
Views: 4832

Re: Mixing Height Information and Stability Plots

I've updated the Vmixing tutorial, and associated scripts, and have attached them here. The pdf file is the basic tutorial, and the two zip files contain scripts and results for Windows and for Linux/Mac. Windows scripts are DOS Batch scripts, and Linux/Mac scripts are Korn Shell. They are simple il...
by MarkCohen
October 30th, 2019, 3:31 pm
Forum: General questions on meteorological data needed for HYSPLIT
Topic: Mixing Height Information and Stability Plots
Replies: 3
Views: 4832

Re: Mixing Height Information and Stability Plots

Hi, this is Mark Cohen. Sorry for the delay in responding to this. I will work to package up the scripts and other explanatory material and provide a URL that they can be downloaded from. Hopefully I'll get this accomplished within the next week or so.
by MarkCohen
April 2nd, 2018, 1:08 pm
Forum: Dispersion Model
Topic: MAXPAR/NUMPAR upper limit
Replies: 7
Views: 6612

Re: MAXPAR/NUMPAR upper limit

Hi, sorry it has taken awhile to respond to your last question. In looking at your questions in this thread, I think the key issue is a what a HYSPLIT "particle" really represents. The "particles" being released and tracked in a HYSPLIT simulation (using the default dispersion mode: 3-D particle) sh...
by MarkCohen
March 8th, 2018, 9:26 pm
Forum: Trajectory Model
Topic: Initial heights and mixed layer depth
Replies: 2
Views: 3873

Re: Initial heights and mixed layer depth

Hello! Thank you for alerting us to this issue, and our apologies for taking so long to respond. First, thanks for providing the details that you did, and for very clear explanations (with color coding!). With the information you provided, I was able to attempt the same runs here (i.e., same startin...

Go to advanced search