Search found 130 matches

by Fantine
June 23rd, 2020, 12:48 pm
Forum: 3. Gridded meteorological data files
Topic: Problem to convert WRF files to ARL
Replies: 5
Views: 134

Re: Problem to convert WRF files to ARL

For converting the WRF files, you will need to have NetCDF library on your computer.
Go to the HYSPLIT tutorial section 3.3, the 1st paragraph on that page, then click the link "Network Common Data Form" which will take you to NetCDF website for the download and installation.
by Fantine
June 23rd, 2020, 11:36 am
Forum: 8. Configuring the CAPTEX simulation
Topic: Ghostscript only displaying one image instead of hourly
Replies: 6
Views: 138

Re: Ghostscript only displaying one image instead of hourly

In the GSview window, you need to click >> button, not scroll down.
by Fantine
June 23rd, 2020, 8:59 am
Forum: Trajectory Model
Topic: How is height converted to pressure when using hybrid sigma-pressure levels?
Replies: 1
Views: 98

Re: How is height converted to pressure when using hybrid sigma-pressure levels?

You may use the hypsometric equation to compute the pressure from temperature and geopotential height.
https://en.wikipedia.org/wiki/Hypsometric_equation or you can find it in any meteorological textbook.
by Fantine
June 23rd, 2020, 8:46 am
Forum: 4. Trajectory calculations
Topic: Terrain height
Replies: 5
Views: 166

Re: Terrain height

Hi Paul, it is not always one higher than another. The terrain height used in HYSPLIT usually comes from the met data. It depends on what terrain dataset the met model uses and how it was processed. So, it may be the model terrain lower than the real terrain height (like the example, in that I selec...
by Fantine
June 22nd, 2020, 5:44 pm
Forum: 4. Trajectory calculations
Topic: Terrain height
Replies: 5
Views: 166

Re: Terrain height

Here is the screenshot (attached):
Image
by Fantine
June 22nd, 2020, 5:00 pm
Forum: 4. Trajectory calculations
Topic: Terrain height
Replies: 5
Views: 166

Re: Terrain height

One way to get the model terrain height for a certain location is to print out the terrain field of the met data. Open the profile menu from Meteorology / Display Data / Text Profile tab. Set the file name of the ARL format data, and put in the lat/long, then generate the profile. For example, below...
by Fantine
June 19th, 2020, 5:15 pm
Forum: 3. Gridded meteorological data files
Topic: types of input grids and internal model grid structure
Replies: 3
Views: 147

Re: types of input grids and internal model grid structure

We have developed converters for output from different meteorological models. There is one for ERA5 (era52arl). Please see this post: https://hysplitbbs.arl.noaa.gov/viewtopic.php?f=14&t=1351&p=4513&hilit=era52arl#p3882 The met converters take care of met data with different types of vertical coordi...
by Fantine
March 19th, 2020, 4:15 pm
Forum: Users
Topic: Increase topography resolution
Replies: 4
Views: 694

Re: Increase topography resolution

For using a user-defined TERRAIN.ASC, you will need to consider and do the following: 1) Check if the terrain data are in the met file. HYSPLIT uses it when it is available. In this case, you will need to remove the terrain data from the met file or modify HYSPLIT subroutine "metinp.f" to not readin...
by Fantine
March 18th, 2020, 9:44 am
Forum: Users
Topic: Increase topography resolution
Replies: 4
Views: 694

Re: Increase topography resolution

HYSPLIT uses the terrain from the meteorological file if it is available. The gdas 1 deg file has terrain data (named as SHGT). For generating a TERRAIN.ASC file, you can follow the Readme_bdyfiles.txt in ~/bdyfiles subdirectory, or check the user guide: https://www.ready.noaa.gov/hysplitusersguide/...
by Fantine
February 4th, 2020, 8:06 pm
Forum: Users
Topic: Problem running Hysplit Archive dispersion
Replies: 1
Views: 1185

Re: Problem running Hysplit Archive dispersion

Your previous post was not deleted. You can still look at it https://hysplitbbs.arl.noaa.gov/viewtopic.php?f=28&t=1765 There are many users using the web-based HYSPLIT. We limit the duration of the runs to prevent our server from being overloaded by users' requests. This applies to both registered a...