1 / 7

Brief Description of CALPUFF

Brief Description of CALPUFF. Navajo Nation Environmental Protection Agency. CALPUFF Modeling System. CALMET :Meteorological Model CALPUFF: Transport & Dispersion Model CALPOST : File Processor POSTUTIL : ammonia background concentrations. Visibility Measurement.

haruko
Download Presentation

Brief Description of CALPUFF

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Brief Description of CALPUFF Navajo Nation Environmental Protection Agency

  2. CALPUFF Modeling System • CALMET :Meteorological Model • CALPUFF: Transport & Dispersion Model • CALPOST : File Processor • POSTUTIL : ammonia background concentrations

  3. Visibility Measurement • Visibility is measured in deciviews • Analogous to the decibel scale for sound • Deciviews = 10*ln(bext / 10) • Extinction increases with the amount of pollution • Lower deciview values represent better visibility • Increasing deciview values represent increasingly poor visibility

  4. 40 CFR Part 51 Appendix YBART Guidelines • Deciview are estimated using the CALPUFF • CALPUFF model includes • SO2, SO4, NOx, secondary organic aerosol (SOA), fine particulate matter (PMF), coarse particulate matter (PMC), and elemental carbon (EC). • Semi-empirical chemical module • conversion of SO2 to particulate sulfate and NOx to particulate nitrate • rate dependent on meteorological conditions and background ozone concentration

  5. Interagency Monitoring of Protected Visual Environments (IMPROVE) • Old IMPROVE or Method 6 equation is: bext = 3 * f(RH) * [sulfate]+ 3 * f(RH) * [nitrate]+ 4 * [organic mass]+ 10 * [elemental carbon]+ 1 * [fine soil]+ 0.6 * [coarse mass]+ 10 • 10 is for Rayleigh scattering • f(RH) is a water growth factor for sulfate and nitrate • relative humidity (RH), ranging from 1 at low humidity to 18 at 98% humidity

  6. Interagency Monitoring of Protected Visual Environments (IMPROVE) • The revised (new) IMPROVE or Method 8 equation is: bext = 2.2 * fS(RH) * [small sulfate] + 4.8 * fL(RH) * [large sulfate]+ 2.4 * fS(RH) * [small nitrate] + 5.1 * fL(RH) * [large nitrate]+ 2.8 * [small organic mass] + 6.1 * [large organic mass]+ 10 * [elemental carbon]+ 1 * [fine soil]+ 1.7 * fSS(RH) * [sea salt]+ 0.6 * [coarse mass]+ Rayleigh scattering (site-specific)+ 0.33 * [NO2 (ppb)]

  7. Applications of CALPUFF • Long range transport • Visibility assessments and Class I area impact studies • Criteria pollutant modeling- SIP • Secondary pollutant formation and particulate matter modeling

More Related