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Journal article Open Access

CEMPD/SMOKE: SMOKE v4.7 Public Release (October 2019)

B.H. Baek; Catherine Seppanen

SMOKE v4.7 Enhancements and Updates

  • New feature in Movesmrg for users to optional to apply hour-specific average speed distribution profiles based on 16-speed bins by FIPS, vehicle, road, fuel, process, and day of the week.
  • USE_AVG_SPD_DIST [default: N]: Define whether to apply hourly average speed distribution profiles by hour or not.
  • AVGSPD_SCCXREF: Average speed distribution SCC mapping input file.
  • SPDIST: 16-speed bin average speed distribution profiles sorted by FIPS, SCC, day of the week and hour.
  • The impacts of these ASD and NOx humidity correction applications have been analyzed in the research presentation from the 2019 International Emissions Inventory Conference.

NOx Humidity Correction Enhancement

  • New feature in Movesmrg for users to correct NOx emissions from exhaust processes using the gridded hourly MCIP meteorology input data.
  • APPLY_NOX_HUMIDITY_ADJ [default: N]: Define whether to apply NOx humidity correction to all NOx emissions from RatePerDistance (RPD) and RatePerHour (RPH) modes.
  • To avoid double NOx humidity correction to existing MOVES lookup tables that already adjusted NOx humidity correction, new header line "HUMIDITY_ADJUSTED_NOX [Y|N]" has been added. If HUMIDITY_ADJUSTED_NOX is set to Y, then APPLY_NOX_HUMIDITY_ADJ=Y setting will be ignored. If there is no header line exited, APPLY_NOX_HUMIDITY_ADJ=Y setting will be also ignored based on an assumption that those MOVES lookup tables already adjusted NOx humidity correction during the MOVES runs.
  • Use the official MOVES 2014 NOx humidity correction equation (K):

      K = 1.0 - (Bounded specific_humidity-75.0) * Humidity correction coefficient
    
  • The bounded Specific humidity unit is in units of grains of water per pound of dry air. The specific humidity is not allowed to be lower than 21 grains and is not allowed to be larger than 124 grains. If the specific humidity input exceeds these limits, the value of the limit is used to calculate the humidity adjustment. Humidity correction coefficients: 0.0038 for Gasoline fuel type and 0.0026 for Diesel fuel type.

  • The impacts of these ASD and NOx humidity correction applications have been analyzed in the research presentation from the 2019 International Emissions Inventory Conference.

Grdmat Updates

  • Fixed a bug of initialization of sphere specification (IOAPI_ISPH)
  • Updated to treat all modeling domain parameters as double precision

Temporal Updates

  • Added new hierarchy for Plant Identification and Unit Identification level temporal cross-reference entry

Bug fixes

  • Various bug fixes since the public SMOKE version 4.6 release in September 2018

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