Validation of IASI FORLI carbon monoxide retrievals using FTIR data from NDACC

[摘要] Carbon monoxide (CO) is retrieved daily and globally from space-borne IASI radiance spectra using the Fast OptimalRetrievals on Layers for IASI (FORLI) software developed at the Université Libre de Bruxelles (ULB).The IASI COtotal column product for 2008 from the most recent FORLI retrieval version (20100815) is evaluated using correlative COprofile products retrieved from ground-based solar absorption Fourier transform infrared (FTIR) observations at the followingFTIR spectrometer sites from the Network for the Detection of Atmospheric Composition Change (NDACC): Ny-Ålesund, Kiruna,Bremen, Jungfraujoch, Izaña and Wollongong.In order to have good statistics for the comparisons, we included all IASI datafrom the same day, within a 100 km radius around the ground-based stations. The individual ground-based data wereadjusted to the lowest altitude of the co-located IASI CO profiles. To account for the different vertical resolutionsand sensitivities of the ground-based and satellite measurements, the averaging kernels associated with the various retrievedproducts have been used to properly smooth coincident data products.It has been found that the IASI CO total columnproducts compare well on average with the co-located ground-based FTIR total columns at the selected NDACC sites and that thereis no significant bias for the mean values at all stations.

[学科分类] 几何与拓扑