International MODIS/AIRS Processing Package

 IMAPP Hyperspectral Sounder Stratospheric Ozone Intrusion Forecast and Analysis Software Package Version 1.0 release     20 May 2014

     IDEA-I: Infusing satellite Data into Environmental Applications - International

A globally configurable software package that creates 48 hour 3 dimensional trajectory forecasts of stratospheric ozone intrusions. Hyperspectral sounder Dual Regression Ozone Profile Retrievals are used to identify regions of high ozone concentrations (>80 ppb) below 500 hPa, and then a trajectory model is run to forecast the horizontal and vertical movement of the ozone over the next 48 hours. The IDEA-I ozone intrusion software identifies regions of stratospheric intrusions, where stratospheric air descends into the troposphere due to tropopause folding events. These events are most likely to occur during the winter/spring months in the case of jet streams at the base of very strong low pressure systems and are most likely to influence surface ozone in regions of elevated terrain.

The hyperspectral instruments supported are:
  • Aqua Atmospheric Infrared Sounder (AIRS),
  • Suomi-NPP Cross-track Infrared Sounder (CrIS), and/or
  • MetOP Infrared Atmospheric Sounding Interferometer (IASI) instrument

The output products consist of both netCDF data files as well as hourly trajectory forecast images, which can be viewed as animations from a web browser using the PHP software that is included as part of this package. The images show the movement of the ozone color coded by the difference in the height of the forecast ozone trajectory and the height of the surface in hPa. Areas where the stratospheric ozone is forecast to affect the surface will appear as trajectories shaded pink

  • CentOS6 64-bit and compatible systems running Intel Linux,
  • A reliable and efficient internet connection to download the required ancillary data consisting of Global Forecast System (GFS) numerical weather prediction files (approx. 400MB per day). The downloads are done automatically as part of the IDEA-I execution. Both the IDEA-I MODIS aerosol and IDEA-I hyperspectral sounder ozone trajectory forecasts require the same ancillary files; if you are using both software packages, this download is required only once per day.
To view your IDEA-I website and animations from a web browser, a web server must be running on your computer. An example IDEA-I ozone web implementation over the USA can be viewed at:

Complete installation and run instructions are included with the release. The IDEA-I software package was developed from the original IDEA package used by United States Air Quality forecasters. For more information on the development and use of IDEA, please see:

  • Al-Saadi, J. A. et al., 2005: Improving National Air Quality Forecasts with Satellite Aerosol Observations, BAMS, DOI:10.1175/BAMS-86-9-1249.