IAGOS Carbon Monoxide contribution and interpolated modeled data from ECMWF – L4

This data product is composed of variables of two sort: Carbon Monoxide contribution and interpolated modeled data from ECMWF.

### Carbon Monoxide contribution: quantification of IAGOS CO origin calculated with SOFT-IO v1.0

Source attribution using FLEXPART and carbon monoxide emission inventories (SOFT-IO version 1.0 ; Sauvage et al., 2017) is a tool based on the FLEXPART particle dispersion model (Stohl et al., 2005) coupled on emission inventories provided in the scientific community (e.g. GVAS v1.2, GFED4, MACCity, EDGAR). It has been developed for the atmospheric community to quantify source/receptor links for atmospheric trace gases considered as passive, such as for in-situ measurements of carbon monoxide (CO). SOFT-IO has been first applied and evaluated over the IAGOS data-sets (MOZAIC, CARIBIC, IAGOS).

SOFT-IO simulates the global contributions of anthropogenic and biomass burning emissions from the ECCAD emission inventory database ([http://eccad.aeris-data.fr/](http://eccad.aeris-data.fr/)) for all measured CO mixing ratio.

This product will help in the interpretation of the subtantial IAGOS data-set. In particular it helps quantifying the CO’ geographical origin and emission sources that drive the observed CO distributions in the troposphere and in the lower stratosphere.

For each CO measurements (every 0.5° in latitude or longitude at cruising altitude, every 10hPa during ascent or descent of the flight), CO origin is automatically calculated and separated by type of source (biomass burning and anthropogenic emissions) and by geographical regions (14 over the globe, see Fig.1).

Ancillary data of CO contribution is automatically calculated and now available in the IAGOS data base, from December 2001 to present day.

### Interpolated modeled data from ECMWF

We also provide systematic ancillary parameters based on ECMWF data and on FLEXPART back-trajectories along each flight measurements. These ancillary parameters are available from 1994 to present day.

The following ECMWF data are interpolated along flight trajectories using 6 hours ECMWF analysis and 3 hours ECMWF forecasts :
- Air potential temperature
- Geopotential height at 500 hPa
- Orography
- Pressure at 4 different PV values (1.5, 2, 3 and 4)
- Surface Pressure
- Vertical wind velocity
- Boundary layer height

We also provide parameters derived from systematic FLEXPART simulations along each flight measurements :
- Potential vorticity