Search found 137 matches

by Fantine
June 23rd, 2020, 8:46 am
Forum: 4. Trajectory calculations
Topic: Terrain height
Replies: 5
Views: 386

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: 386

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: 386

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: 325

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: 866

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: 866

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: 1332

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...
by Fantine
January 31st, 2020, 11:59 am
Forum: Conversion programs
Topic: Error while compiling and linking api2arl
Replies: 1
Views: 1428

Re: Error while compiling and linking api2arl

The api2arl converter needs either grib_api library or eccodes library to decode the grib format met data. If you are using grib_api library, replace "use grib_api" with "use eccodes" in the api2arl_v3.f. If you have eccodes library, the api2arl_v3.f should be compiled as (or use the attached Makefi...
by Fantine
January 31st, 2020, 11:15 am
Forum: Dispersion Model
Topic: Problem running Hysplit Archive dispersion
Replies: 2
Views: 1621

Re: Problem running Hysplit Archive dispersion

Have you compared the CONTROL of both runs? It may give you a hint about why the results are different. You may want to consider using the HYSPLIT PC version which has some features not available in the web-based version. Here is the downloading page of the PC version: https://www.ready.noaa.gov/HYS...
by Fantine
November 27th, 2019, 12:08 pm
Forum: General questions on meteorological data needed for HYSPLIT
Topic: HYSPLIT meteororlogical data files-Q 4,5
Replies: 2
Views: 1604

Re: HYSPLIT meteororlogical data files-Q 4,5

The error showed that the trajectory started outside the met domain. Did you center the met grid at the location of your trajectory starting point when you created met data? As mentioned in the tutorial section 3.5 (https://ready.arl.noaa.gov/documents/Tutorial/html/meteo_enter.html), this function ...