IASI L2 carbon monoxide (CO) climate data record

Description

The IASI L2 carbon monoxide (CO) climate data record (CDR) provides CO concentrations and auxiliary variables used to build atmospheric profiles of CO observations. DOI: 10.15770/EUM_SAF_AC_0047

Type

Climate data record

Satellites and instruments

IASI/Metop-A and IASI/Metop-B

Algorithm version

FORLI v20151001

Time period

10/07/2007 - 15/09/2021 (IASI/Metop-A)
20/02/2013 - 31/12/2023 (IASI/Metop-B)

Theoretical basis

The Fast Optimal Retrievals on Layers for IASI (FORLI) algorithm retrieval of this product is based on the optimal estimation method. It relies on a radiative transfer model based on precalculated Lookup Tables (LUTs) and an inversion scheme to process IASI level 1C radiances.

Processing

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 at nadir (circular pixel 12 km in diameter) to 10 x 20 x π km² at larger viewing angles.

Validation

This product is validated by BIRA/IASB. Validation is performed using ground-based carbon monoxide profile measurements from the NDACC network. See the validation report below for more details.

Archiving and dissemination

This product is available via the EUMETSAT Data Store.

File format and size

This product is available in NetCDF format, each day containing about 14 orbits/instrument. The size of each orbit is on the average 30-35 MB, which gives a total size of around 450 MB/day/instrument.

Reading tools

CO_Jupyter_Notebook.zip containing:

Clean_and_Reconstruct_CO_matrix_final.ipynb - Jupyter Notebook file
Clean_and_Reconstruct_CO_matrix_final.py - Jupyter Notebook converted into plain Python
Sa_CO.csv - Auxiliary file to reconstruct the matrices
Example IASI L2 CO file in NetCDF format