Infrared Atmospheric Sounding Interferometer (IASI)

Infrared Atmospheric Sounding Interferometer (IASI), is a hyperspectral infrared sounder residing on the European Space Agencys (ESA) MetOp series of polar orbiting satellites. These data are made available to NOAA through the International Joint Polar-Orbiting Operational Satellite System (IJPS) agreement. The first priority of the IASI Product Processing System (PPS) is to generate radiance products that are produced using Level 1C data, which are ingested in a pipeline mode from the European Organization for the Exploitation Meteorological Satellites (EUMETSAT), applied to spectral and spatial sub-setting. The system generates Level 1C Thinned (L1CT) radiance and Level 2 profile products. Currently the IASI level 2 products from MetOp-2 and MetOp-3 satellites include temperature and humidity profiles with a vertical accuracies of 1 degree Kelvin and 10% per 1-km layer respectively, trace gases, and the cloud cleared radiances (CCR) on a global scale and these products are available to the operational user community.

There are two time periods available for each group of data: • Time period 1 covers from 00Z to 12Z of the current day.
• Time period 2 covers from 12Z to 24Z of the current day.

The data are separated into the following groups:

Retrieved Parameters • Temperature - 100 levels of retrieved temperatures
• First Guess Temperature - 100 levels of First Guess Temperatures
• Mixing Ratio of Water - 100 levels of Vapor Mixing Ratio of Water Vapor
• Mixing Ratio of Ozone - 100 levels of Mixing Ratios for Ozone
• Mixing Ratio of Carbon Monoxide - 100 levels of Mixing Ratios for Carbon Monoxide
• Mixing Ratio of Carbon Dioxide - 100 levels of Mixing Ratios for Carbon Dioxide
• Mixing Ratio of Methane - 100 levels of Mixing Ratios for Methane

Surface Properties, Satellite Info, and Retrieval Flags • Skin Temperature - 1 Parameter
• First Guess Skim Temperature - 1 Parameter
• Bottom Level Index - Parameter
• Microwave Surface Emissivity - 1 Parameter
• Quality Flag - 1 Parameter
• Average Carbon Dioxide - Parameter

Cloud Top Properties • Cloud Top Fraction - 2 Images displayed over two levels
• Cloud Top Pressure - 2 Images displayed over two levels

Other Parameters • Stability Parameters - 10 Stability Parameters
• Infrared Surface Emissivity - 50 Infrared Parameters
• Microwave Emissivity - 7 Microwave Parameters