Dust Storms: Simplified Algorithm


  • Vertical dust flux (g) as a fraction of the horizontal transport
  • Threshold fixed at 28 cm/s
  • Over the U.S. the dust emission algorithm needs ½ deg data
  • Define a 3-point domain for emission grid in CONTROL file
  • Run the pre-processor to find desert land-use cells



Edit ASCDATA.CFG to point to 0.5 deg data

0.5 0.5

   lat/lon spacing in degrees

360 720

   lat/lon number of data points

'../bdyfiles/bdyfiles0p5/'

   directory of files




Start with GUI reset prior to Retrieve

CONTROL_dust0.txt

   constant threshold method

38.00 -115.00

   lower left

41.00 -110.00

   upper right

38.25 -114.75

   adjacent point

SETUP_dust.txt

   enable dust algorithm

ichem=3

   namelist enable dust emission algorithm

100000

   namelist particle number







1.0E+06

   convert grams to micrograms

500+200+100+50+20+10

   force contours




AirNow_dust.txt

   PM measurement file

1.0E+06

   convert grams to micrograms




Examine Hourly Concentration Maps