Search found 14 matches

by roland.draxler
April 22nd, 2019, 11:40 am
Forum: HYSPLIT for Mac OS X
Topic: HYSPLIT on Mac OS Mojave
Replies: 2
Views: 992

Re: HYSPLIT on Mac OS Mojave

The issue is with the desktop app that launches HYSPLIT. There are two solutions. One is to start hysplit from the terminal window in the working directory by typing ../guicode/hysplit4.tcl. If you want to launch it from the desktop, create a new file called hysplit4.sh with the following contents: ...
by roland.draxler
April 23rd, 2015, 10:47 am
Forum: Users
Topic: HYSPLIT intended use
Replies: 2
Views: 1382

Re: HYSPLIT intended use

The plan seems reasonable. However, one cautionary note. With a WRF grid spacing of 100 m, and with HYSPLIT currently capable of a minimum time step of only one minute, it seems likely that you will have flow regimes where the particles can jump one or more grid points during a time step. Not fatal,...
by roland.draxler
July 22nd, 2013, 2:36 pm
Forum: Trajectory Model
Topic: Pressure Coordinates
Replies: 3
Views: 2033

Re: Pressure Coordinates

The HYSPLIT code remaps all input meteorological data to its own terrain following sigma-height coordinate system from whatever coordinate system was used to create the input data file. All of the current meteorological files provided by NOAA-NCEP for conversion to the HYSPLIT input format have eith...
by roland.draxler
June 10th, 2013, 3:01 pm
Forum: General questions on meteorological data needed for HYSPLIT
Topic: Wind direction for Trajectory
Replies: 1
Views: 1448

Re: Wind direction for Trajectory

You would need to create your own meteorological file. Use the GUI meteorology / Convert to ARL / User Entered menu tab. Follow the help instructions S128.htm.
by roland.draxler
June 10th, 2013, 2:58 pm
Forum: Conversion programs
Topic: ECMWF switch to GRIB2
Replies: 2
Views: 1951

Re: ECMWF switch to GRIB2

A GRIB2 to ARL converter is supplied both with the PC and LINUX versions. You can find the program (api2arl) in the /data2arl directory. Only the source code is provided and it needs to be compiled using the ECMWF grib_api libraries. Some customization may be required depending upon the data fields ...
by roland.draxler
February 28th, 2013, 5:21 pm
Forum: Conversion programs
Topic: Lambert Conformal Projection and grib2arl
Replies: 4
Views: 3207

Re: Lambert Conformal Projection and grib2arl

The grib2arl program only handles global lat-lon input files. The attached program (amps2arl) is a simplified version that will convert GRIB1 files on a conformal projection to the HYSPLIT format without altering the map projection. However, it is hardwired for a particular application and you will ...
by roland.draxler
February 22nd, 2013, 11:05 am
Forum: General questions on meteorological data needed for HYSPLIT
Topic: Why GDAS0P5 data have no w velocity?
Replies: 6
Views: 3138

Re: Why GDAS0P5 data have no w velocity?

When there are strong vertical motions, the vertical velocity using the integrated divergence and the vertical velocity generated by the meteorological model will give similar results. An example from the 1-degree GDAS is shown. For situations where the motions are weaker, the divergence calculation...
by roland.draxler
February 20th, 2013, 4:19 pm
Forum: Announce
Topic: HYSPLIT update
Replies: 0
Views: 2826

HYSPLIT update

The PC installer has been updated to support Windows-8
The Mac installer has been changed to a simple disk image file (.dmg) to improve compatibility with multiple versions of OSX.
by roland.draxler
February 20th, 2013, 4:14 pm
Forum: HYSPLIT for PCs
Topic: error message
Replies: 1
Views: 1373

Re: error message

Not having the permission to delete files usually means there is a conflict between user permissions and administrative permissions. Try logging on as an administrator. If there is no administrator account, open the GUI, click on the center "Reset" button, then open either the trajectory or concentr...
by roland.draxler
February 20th, 2013, 2:55 pm
Forum: Dust
Topic: Extended PM10 algorithm data
Replies: 1
Views: 2930

Re: Extended PM10 algorithm data

The link to the emission data files can be found near the bottom of the following page -
http://www.meteozone.com/tutorial/html/cust_dust.html