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Example images of daily distributions (day and night)

IASI NRT CO (day) from Metop-B NRT NRT CO (night) from Metop-B

Image collection

Description: The near real-time IASI CO product provides several variables from which the CO column, profile, and corresponding averaging kernel matrix can be reconstructed/calculated.

Type: Near real-time. Based on product requirements, the product files must be available to users within three hours after observation.

Theoretical basis: The retrieval of this product is based on the optimal estimation method. It relies on a radiative transfer model based on pre-calculated LUTs and an inversion scheme to process IASI level 1C radiances in near real-time.

Processing: The Fast Optimal Retrievals on Layers for IASI (FORLI) is a dedicated radiative transfer and retrieval software for IASI. It was developed at the Université Libre de Bruxelles (ULB) in collaboration with LATMOS, with the objective to provide global concentration distributions of atmospheric trace gases.

Units and spatial resolution: CO total column and CO profile are given in molecules/cm2. In 8 seconds a total of 120 views are collected over a swath of ∼2200 km, divided as 30 arrays of four individual pixels varying in size from 36 x π km2 (circular pixel 12 km in diameter) at nadir to 10 x 20 x π km2 (elliptical pixel) at larger viewing angles.

Validation: This product is validated by LATMOS. Validation is based on detailed comparisons with satellite, ground-based and aircraft data. See the validation report for more details.

Online quality monitoring: The product quality is constantly monitored by ULB. Internal daily reports assess the daily match between the offline local product and the operational EUMETSAT product.

Dissemination: Channel EUMETCast Europe on EUTELSAT 10A.

File format: This product is available in BUFR format.

Algorithm version information: v20151001 (for Metop-A and Metop-B)