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Regional Modeling System for Aerosols and Deposition (REMSAD)
Entry ID: REMSAD
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Summary
Abstract: REMSAD is a three-dimensional grid model designed to calculate the concentrations of both inert and chemically reactive pollutants by simulating the physical and chemical processes in the atmosphere that affect pollutant concentrations. The basis for the model is the atmospheric diffusion or species continuity equation. This equation represents a mass balance in which all of the relevant emissions, transport, diffusion, chemical reactions, and removal processes are expressed in mathematical terms. The REMSAD system consists of a series of preprocessor programs, the core model, and several postprocessing programs. The model solves the species continuity equation using the method of fractional steps, in which the individual terms in the equation are solved separately in the following order: emissions are injected; horizontal advection/diffusion is solved; vertical advection/diffusion and deposition is solved; and chemical transformations are performed for reactive pollutants. The model performs this four-step solution procedure during one half of each advective (driving) time step, and then reverses the order for the following half time step. The maximum advective time step for stability is a function of the grid size and the maximum wind velocity or horizontal diffusion coefficient. Vertical diffusion is solved on fractions of the advective time step to keep their individual numerical schemes stable. A typical advective time step for coarse (50-80 km) grid spacing is 10-15 minutes, whereas time steps for fine grid spacing (10-30 km) are on the order of a few minutes.

Model inputs are prepared for meteorological and emissions data for the simulation days. Once the model results have been evaluated and determined to perform within prescribed levels, a projected emission inventory can be used to simulate possible policy-driven emission scenarios. The representation of the various processes in the model is based on current scientific understanding. References are given in the User's Manual.

http://cfpub.epa.gov/crem/crem_report.cfm?deid=84891

Related URL
Link: VIEW RELATED INFORMATION
Description: User's Guides are available for v 6.4 and 7.02

Link: VIEW RELATED INFORMATION
Description: Other information related to REMSAD.
Service Citation
Title: Regional Modeling System for Aerosols and Deposition (REMSAD)
URL: http://remsad.saintl.com/
ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
ELEVATION
ENVIRONMENT
GEOSCIENTIFIC INFORMATION
IMAGERY/BASE MAPS/EARTH COVER
PLANNING CADASTRE
Access Constraints
Users must register in order to download software.

http://remsad.saintl.com/register.htm
Use Constraints
Technical Requirements

Computer Hardware
PC or Workstation, min 500Mb RAM, 100 Gb disk storage

Operating Systems
Unix, Linux

Programming Languages
Fortran 77
Service Provider
Regional Modeling System for Aerosols and Deposition, ICF Consulting

Service Provider Personnel
Name: SHARON DOUGLAS
Phone: (415) 507-7108
Email: sdouglas at icfconsulting.com
Contact Address:
Systems Applications International/ICF Consulting
101 Lucas Valley Road, Suite 230,
City: San Rafael
Province or State: CA
Postal Code: 94903
Country: USA
Personnel
TYLER B. STEVENS
Role: SERF AUTHOR
Phone: (301) 614-6898
Fax: 301-614-5268
Email: Tyler.B.Stevens at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA

SHARON DOUGLAS
Role: TECHNICAL CONTACT
Phone: (415) 507-7108
Email: sdouglas at icfconsulting.com
Contact Address:
Systems Applications International/ICF Consulting
101 Lucas Valley Road, Suite 230,
City: San Rafael
Province or State: CA
Postal Code: 94903
Country: USA
Creation and Review Dates
SERF Creation Date: 2005-05-02
SERF Last Revision Date: 2011-12-21
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