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HYSPLIT Model Updates

Highlights of Recent Updates


February 2016 (804)

  • Added Ganser fall velocity applicable for particles larger than 20 microns
  • New option to calculate nuclide daughter products
  • Bug fix to allow for multiple vertical line sources
  • Corrected longitude span for global grids less than 1 degree
  • New concadd option to mask base concentration as a factor of the base concentration
  • New concadd option to divide 2 concentration files
  • More residence time option in trajectory frequency

June 2015 Revision (761)

  • More residence time option in trajectory frequency
  • Changed default scavenging coeficients for wet deposition
  • Enhanced GoogleEarth output for particle plotting programs
  • New option to create polar coordinate concentration grids
  • Improved handling around dateline for isochron and grid plot programs
  • Revised binary to coefficient matrix program to handle arbitrary start and stop times
  • Enhanced vertical mixing when convective available potential energy value exceeded (CAPEMIN)
  • Permit emission durations of less than one time step
  • New option to create talagrand diagram to process ensembles
  • New module to compute decay and deposition of the Foot and Mouth disease virus
  • Corrected resuspension subroutine
  • Added new land use and terrain height files with 0.5 deg. resolution

October 2014 Revision (664)

  • Numerous changes to display programs: concplot, gridplot, timeplot, isochron
  • Simplified LINUX compilation by moving NetCDF paths to environment from Makefile
  • Options to decay concentrations extracted at a point from the output data file
  • A diagnostic option was added (krand=3) to turn off particle mixing
  • Option to permit the computation of a multi-release time transfer coefficient in one run
  • Revised within-cloud scavenging ratio to use cloud-layer rather than grid-cell depth
  • Option to specifiy within-cloud scavenging as a ratio or time constant (like below-cloud)
  • WRF data conversion program now supports input latitude-longitude grids
  • Revised point source emission algorithm to deal with sub-time step emission durations
  • Forced concentration output to disk when time step jumps over end-of sample time

July 2014 Revision (631)

  • WRF-ARW converter modified to compute hourly precipitation when data interval less than 1h
  • Improved precision for vertical velocity and precipitation fields when using WRF-ARW
  • New diagnostic output file with just WARNING messages when they exist
  • Numerous corrections to clustering programs: displaying mean trajectories, dateline issues
  • CONTROL and SETUP.CFG files from the internet can now be retrieved with comments after hash
  • Bug fix in particle plot routines to avoid displaying deleted particles that have no position
  • Numerous corrections to Google Earth conversions: year boundary, clamp to ground,
  • Added support for bit-map decoding in the NARR GRIB converter
  • Revised conversion of NARR GRIB files to be consistent with NOMADS file name convention
  • Numerous bug fixes to GUI scripts: reset button, file name data entry
  • Updated time-of-arrival graphical product
  • GRIB lat-lon grid conversion program extended to support 0.125 deg resolution

March 2014 Revision (577)

  • New option to permit two different particle position files for model initialization:
    one for initial conditions, particles are continued from a previous simulation, and one for
    particle boundary conditions, representing particles emitted during a previous simulation
    over the same time domain as the current simulation.
  • Corrected Mercator/Polar-Stereo projection option with WRF-ARW converter
  • New option in the particle plotting programs to show color with age or height
  • New concplot option to turn off the printing of the maximum and minimum concentrations
  • New namelist option to permit particle position output every time step
  • Correction to insure different time period meteorological files are defined when on the same grid
  • New option to overwrite particle output file rather than append multiple time periods
  • MPI versions now support the command line argument as the suffix for the CONTROL and SETUP files
  • Corrected backward version of the GEM subroutines to handle multiple meteorology files

August 2013 Revision (515)

  • Numerous issues related to producing KML-KMZ output corrected
  • Permit the use of an time varying emissions input file with backward simulations
  • Revised source-receptor solution menus to solve for time variation of emissions
  • New program to create CSV output files which includes model and measurements
  • Revised program to compute radiological dose with new GUI menu
  • Resolved problems with particle file initialization when number exceeds array limits
  • Random number generator defaults based upon particle number (gt 5000 use faster method)
  • Modified conversion for animations to properly overwrite background
  • Fixed problem with multiple meteorological grids when source not on all of the grids
  • Multiple minor GUI changes to conform to September 2013 workshop materials
Modified: January 6, 2017
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