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Data Format

Posted: April 16th, 2015, 3:34 am
by asal
Hello
I have a question.  Except for the actual meteorological data as output WRF, can be artificial data manually entered into the HYSPLIT? For example, a data with .txt format can be converted for HYSPLIT?

Re: Data Format

Posted: April 16th, 2015, 2:34 pm
by glenn.rolph
Yes, you can use the program sfc2arl.exe to convert user entered surface data to a HYSPLIT formatted file. See /hysplit4/html/S128.htm in the html directory of PC HYSPLIT for more details on the configuration. There is also a program to convert a single vertical profile of meteorological data to HYSPLIT formatted file using snd2arl. Details on snd2arl can be found by running snd2arl.exe in the PC exec directory with no command line options.

Warning, if the single profile or infrequent surface data does not adequately represent the true atmosphere, especially away from the location of the observation, the HYSPLIT results will also not be representative. Running a mesoscale model such as WRF, is a better option in most cases.

Re: Data Format

Posted: May 1st, 2015, 3:18 pm
by asal
Is it possible to convert the observation data from observation stations?

Re: Data Format

Posted: May 4th, 2015, 7:04 am
by glenn.rolph
As I mentioned in my last post, yes, you can enter your surface station data for one location using the sfc2arl.exe program and HYSPLIT can use this data, however it may no adequately represent the 3D characteristics of the real atmosphere and should not be used more than a few kilometers from the observation location.

Re: Data Format

Posted: May 4th, 2015, 9:38 am
by asal
My data file includes wind direction and speed, temperature, pressure, humidity, altitude, etc., for different levels of the atmosphere.
Can be used sfc2arl or snd2arl programs?How to use this program?!
I'm going to be a test of the data.

Re: Data Format

Posted: May 4th, 2015, 10:54 am
by glenn.rolph
There is no formal help for these conversion programs, however the attached html help file from the PC version of HYSPLIT gives instructions on how to enter surface data into the program and you can just run the two programs without any command line options for help on each program.

Re: Data Format

Posted: September 10th, 2019, 8:32 am
by Smaug
Can you please confirm what the actual units of these variables actually are? I believe the WSPD is in knots and not in m/s as it says in the document. According to this the WSPD is in knots. https://ready.arl.noaa.gov/hypub/flddesc.html

Re: Data Format

Posted: September 10th, 2019, 8:40 am
by Smaug
S141.html also says T02m is in Kelvin but https://ready.arl.noaa.gov/hypub/flddesc.html states that T02M should be in degrees?

Re: Data Format

Posted: September 10th, 2019, 9:06 am
by glenn.rolph
The inputs to sfc2arl should be entered in the GUI using the following units:

DIR: deg.
SPD: meters/sec
MixLayer: meters

The binary output file (stndata.bin by default) then contains the following:

PRSS: hPa
HGTS: meters
TEMP: Kelvin
UWND, VWND: meters/sec
UVAR, VVAR, WVAR: unitless

You may be confusing the output you get when you use the "Text Profile" GUI program to view the data in the file. That program converts the final outputs to a file (profile.txt) with these units:

HGTS: meters
TEMP: Degrees Celsius
UWND,VWND: meters/sec
UVAR, VVAR, WVAR: unitless
TPOT: degrees Kelvin
WDIR: degrees
WSPD: meters/sec