HYSPLIT Forum: hysplitbbs.arl.noaa.gov

Hi Ming,

The interval is how frequent output is written to the output file.

Sampling interval: type hour minute
00 01 00 = instantaneous concentrations written to the output file every hour.

An update has been committed to the repository for the Linux version (Version 1011). If you don't have access to the source code, for now you can obtain the mixing height at the initial time and location of your trajectory using the profile program. If you are using the gui, click on Meteorology -> ...

Hi, See the Readme in the fcsubs directory for help in compiling it with something other than the gnu compiler. Note that this library is only used for converting some GRIB meteorological datasets / model output if using the C version of the fcsubs libarary, so you may not need it. For compiling wit...

Hi, Thanks for helping me identify a bug. It appears HYSPLIT is printing out the location at the starting time, but the mixing depth after one timestep. It is also calculating the first timestep twice. I am currently testing a bug fix. I will reply back after I post a fix to the Linux version to the...

HYSPLIT run with MPI should be faster. To run HYSPLIT from the testing directory and to keep track of the computational time use the following commands: with MPI using 4 CPUs: time -v mpirun -np 4 ../exec/hycm_std serially: time -v ../exec/hycs_std The only thing you need to change in the Makefile i...

The seed id is set in hymodelc.F with the variable seed_id. seed_id is set to -1 and for MPI and ensemble runs, the seed_id is set to -ABS(job_id+1) and -ABS(ens_id), respectively. If you edit hymodelc.F, recompile your programs built from hymodelc.F by typing "make program_name" in the exec directo...

To convert a WRF-ARW output file to an ARL file using the gui, click on Meteorology -> Convert to ARL -> WRF-ARW, define the intput and output filenames and directories, and then process the data.

To convert using the executable in a linux environment, use the arw2arl program.

Please review the HYSPLIT tutorial, specifically Chapter 6:

https://ready.arl.noaa.gov/documents/Tu ... index.html

Section 6.2 goes over how to perform a cluster analysis, which is what is shown in the Li et al. figure you attached.

Yes, the extracted meteorology variables that you see are interpolated WRF fields. HYSPLIT uses a linear interpolation technique. First, HYSPLIT interpolates WRF fields onto HYSPLIT's domain and then interpolates these new meteorology fields onto the trajectory (which is what you see in your output)...

1) No, Ztop does not impact simulated transport over topographical features. 2) 8 km AGL is well outside the PBL. A difference will only be found between a trajectory with Ztop set to 10km vs 20km if the trajectory encounters an extreme convective event that lofts particles above 10 km. More details...