ESA-JAXA Pre-Launch EarthCARE
Science and Validation Workshop
13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

Assimilation of different aerosol products of the EarthCare mission during theCAL/VAL program
Laaziz EL AMRAOUICNRM ; Meteo-France & CNRS, Toulouse, France

The ErathCARE mission
Scientific objectives:➢ Improvement of the vertical distribution of natural and anthropogenic aerosols on a global scale➢ Improve our understanding of cloud-aerosol-radiation interactions (NWP and climate purposes)➢ Derivation of profiles of atmospheric radiative heating and cooling

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

The ErathCARE mission
Scientific objectives:➢ Improvement of the vertical distribution of natural and anthropogenic aerosols on a global scale➢ Improve our understanding of cloud-aerosol-radiation interactions (NWP and climate purposes)➢ Derivation of profiles of atmospheric radiative heating and cooling

For this contribution :➢ Improvement of the vertical distribution of natural and anthropogenic aerosols on a global scale➢ Improve our understanding of cloud-aerosol-radiation interactions (NWP and climate purposes)➢ Derivation of profiles of atmospheric radiative heating and cooling

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

Motivations …
We will try to address some key points regarding the use of EarthCARE data:▪

How can data assimilation contribute to the validation of EarthCARE aerosols observations ?

▪

What added value can EarthCARE data give to better characterize aerosols at global scale ?

▪

Can the use of EarthCARE aerosol observations within a global assimilation system add value compared to allexisting data ?

▪

How EarthCARE data could help to improve the model parametrizations using data assimilation ?

▪

What kind of information could EarthCARE bring to the assimilation system during extreme events (e.g., desert
dust outbreaks, wildfire events or volcanic eruptions) ?

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

The assimilation system➔ It is developed within the MOCAGE model: the chemical transport model of Météo-France covers both troposphere andstratosphere with gases and aerosols:– 47 vertical levels (from the ground up to 5 mbar : ~40m near the surface till ~800m in the stratosphere)– Global: 2°x2° ; 1°x1° and 0.5°x0.5°– Regional: 0.5°x 0.5° ; 0.2°x0.2° and 0.1°x 0.1°
➔ Assimilated products– AOD observations:• Many wavelengths (>20: UV-IR) are implemented in MOCAGE for AOD assimilation– Lidar profiles :• The observation operator is able to solve the lidar equation for:o Wavelengths: 355, 532, 1064 nm
o Quantities: the backscattered lidar signal, the extinction coefficient (α), the backscattering coefficient (β)
o Geometries: Satellite, ground-based or aircraft (up or down) lidars

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

The Aerosol Assimilation SystemAOD

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

Lidar Profiles

Assimilation of AOD (MODIS)▪ The assimilation system is operational since January 2020
▪ Validation of MODIS AOD assimilation for many years and for specific events:➔ Overall good agreement of assimilated fields compared to AERONET

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

Assimilation of AOD (MODIS)ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

Assimilation of AOD (MODIS)
Saharan dust Outbreak over Greece (March 2018)

MODIS
Desert dust event over France (February - March 2021):

Pollution event due to dusttransport over China (March 2021)

PM2.5+10 fois
la norme

AOD∽3ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

Assimilation of AOD (MODIS)
MODIS

Australian Wildfires: Nov – Dec 2019(a): CALIOP trajectory(b): Backscatter coefficient (CALIOP)(c): Backscatter coefficient (Model)(d): Backscatter coefficient (MODIS Assimilation)

El Amraoui et al., 2022

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

Assimilation of CALIOPE lidar profiles
MODISAssimilation exercise :➔ TRAQA-2012 (20-29 June)➔ Saharan Dust Outbreak over The MBMean➔ Extinction Coefficient
OMF

OMA

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), ItalyStd.Dev

Assimilation of CALIOPE lidar profiles• Comparison with AERONET AOD observations

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

MODIS

Assimilation of CALIOPE lidar profiles
MODISEl Amraoui et al., 2020
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

Summary
The modelling and assimilation activities during the EarthCare CAL/VAL will have as
objectives :o Assessment of the vertical structure of EarthCare products (compared to modellingfields & other observations)o How the EarthCare products can constrain the models at global scale via dataassimilation ➔ compared to independent observations performed during theCAL/VAL periodo Evaluation of the added-value of EarthCare observations within a Global Observation
System using data assimilation (taking into account other observations)
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy