ESA-JAXA Pre-Launch EarthCARE
Science and Validation Workshop

13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

L1 simulator tool for EarthCARE’s Multi-Spectral Imager (MSI)
Nils Madenach1, Sebastian Bley2, Nicole
Docter1, René Preusker1, Anja Hünerbein2
1Freie Universität Berlin, 2TROPOSMSI forward tool: Overview• Python tool for realistic simulations of EarthCARE MSI radiances and BTs• Input data can be from models or/and measurements (e.g. campaigns)• Consisting of two modules:• MSI VNS (FUB): VIS (0.67µm), NIR (0.865), SWIR1 (1.65), SWIR2 (2.21)• MSI TIR (TROPOS): TIR1 (8.8), TIR2 (10.8), TIR3 (12.0)• Flexible with respect to input data (e.g. scattering functions, number oflayers etc.)• Tailored for MSI spectral channels (accounting for smile in VNS)ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

MSI forward tool: Structure• JSON input file containing all
relevant information for VNS and TIR

MORTY-RTS• One JSON file per column/pixel• Reading and validation of input file
• Radiative transfer simulations using• VNS: MORTY-RTS*• TIR: RTTOV• Write spectral radiances and BT inEarthCARE MSI RGR format

Model DATAMSI VNS
forward tool
json input file

Reading and checking of provided json input
fileCampaign L2products

L1 spectral radiances and brightness
temperatures in EarthCARE format
MSI TIR
forward tool

RTTOV

*MORTY-RTS: Matrix Operator Radiative Transfer in pYthon – Radiative Transfer Solver
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

MSI forward tool: Example – Lindenberg 9 July 2022

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

MSI forward tool: Example – Lindenberg 9 July 2022

Cloudnet.fmi.fi

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

MSI forward tool: Example – Lindenberg 9 July 2022

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

MSI forward tool: Summary• MSI tool freely available for download• Integrated in the ESA data validation center (EVDC) (talk anddemo by Jarek Dobrzanski on EVDC Cal/Val tools)• Successfully tested using input from Cloudnet and PollyXTlidars• First validations against observations
from MSG SEVIRI and MODIS look promising

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

MSI forward tool: Demonstration• When?
• Today 17:30 during Demos/Poster Session• Where?
• Cook Room
• Download:• https://gitlab.com/wew_fub/msi-toolThanks!
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

Intense dust outbreak on 3 June 2022x

https://polly.tropos.de/Modis Aqua 3 June 2022, 14:45 UTC
Source: https://www.earthdata.nasa.gov/worldview• Simulation of strong dust events can help toimprove the discrimitation between clouds andaerosol in MSI scenes• Synergy between MSI and ATLID provides abetter picture
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

Simulated MSI
10.8 micron
channel andcollocated
MSG SEVIRI
pixel, courtesy
by G. Walter