Codes

The Rapid Dispersion Code (RDC)

The Rapid Dispersion Code (RDC) is a tool to estimate the long-term pollutant concentrations due to emissions sources at ground level including point, line and area sources in a computationally efficient manner while minimizing errors. Further details on the code development can be found in Atmospheric Environment (2008) and Atmospheric Environment (2009). The relatively low computational cost of RDC (compared with other dispersion models) makes itself especially suitable for policy analyses.

The code is available for download using the link below:

A technical note describing the extension and containing installation instructions can be found here.


GEOS-Chem Unified Tropospheric-Stratospheric Chemistry Extension v1.5 (Interim Distribution)

An interim distribution of the GEOS-Chem Unified Tropospheric-Stratospheric Chemistry Extension (UCX) is now available online. This code expands the scope of the global chemistry transport model GEOS-Chem’s online chemistry to include stratospheric gas-phase and heterogeneous chemistry, online stratospheric aerosol formation, expanded photolysis and emissions of long-lived source gases not previously present in GEOS-Chem. This is intended for researchers who want access to GEOS-Chem UCX right away. It will no longer be necessary once UCX is incorporated into the main GEOS-Chem branch, which is planned for early 2014.

The code is available for download using the link below:

A technical note describing the extension and containing installation instructions can be found here.


Aviation Emissions Inventory Code v2.1

The Aviation Emissions Inventory Code (AEIC) v2.1 is now available online. This is an update to AEIC v2.0 that includes improved black carbon (BC) emission estimates. Further details on the updated BC estimation methods can be found in Environmental Science and Technology (2013), as well as Transportation Research Part D (2013) and Atmospheric Environment (2011). The code and packaged datasets are released under the BSD license at this time.

The code is available for download using the link below:

An updated global emissions dataset generated using AEIC v2.1 is also available on the emissions datasets page.

Aviation Emissions Inventory Code v2.0

The Aviation Emissions Inventory Code (AEIC) v2.0 is now available online. The code, written in Matlab, is able to estimate aviation emissions from all phases of flight, with the associated uncertainties quantified. The code and packaged datasets are released under the BSD license at this time.

The code and documentation is available below:

A global emissions dataset generated using AEIC along with documentation is also available on the emissions datasets page and a journal paper is available in Transportation Research Part D (2013), as well as the previous paper in  Atmospheric Environment (2011). This emissions dataset is currently being integrated into GEOS-Chem.

Aviation Emissions Inventory Code v1.0

We are pleased to release the Aviation Emissions Inventory Code (AEIC) v1.0. The code, written in Matlab, is able to estimate emissions arising from aircraft LTO activity, auxiliary power units (APU) and ground support equipment (GSE) at a single airport or set of airports within the US and UK. Further details regarding this code was described in Atmospheric Environment (2011). The code and packaged datasets are released under an amended BSD license.

The code and associated datasets are packaged in a tar.gz archive, available for download using the link below:

This has been superseded by AEIC v2.0, but v1.0 may be of use to users who only need LTO emissions.

Output from the Rapid Dispersion Code for pollutant contours in the locality of an airport.

Over the coming weeks and months, the Laboratory for Aviation and the Environment will be releasing additional research codes that we think may be of use to other researchers.  We anticipate releasing the following codes created at the Laboratory for Aviation and the Environment:

  • Tools for generating CMAQ-ready emissions in Europe (with detailed UK emissions), South-East Asia and the US
  • A rapid dispersion code that enables local air quality calculations orders of magnitude faster than conventional techniques
  • Various utility codes that will be of broader research use

Please contact us for further information or follow us on Twitter (@MIT_LAE) to learn about updates to codes/datasets and new releases.