ESA-JAXA Pre-Launch EarthCARE
Science and Validation Workshop

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

EVID09: Strategy of measurements with the light balloon aerosols counter
LOAC for the validation of EarthCare (BAIVEC project)
Jean-Baptiste RENARD, Gwenaël BERTHET
LPC2E-CNRS, Orléans, France

Balloon-bone measurements of aerosols with the LOAC aerosols counter:- Concentrations of aerosols for 19 size classes from 200 nm to 50 µm- Previous version of LOAC: Measurements at 2 scattering angles to retrieve the size distribution (firstchannel) and an estimate of the aerosol typology (from the ratio of the 2 channels measurements)

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

EVID09: BAIVEC

Measurements from ground up
to ~30 km

Concentrations

Typology

Resolution of ~100 m in thelower troposphere

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

EVID09: BAIVEC

- Conversion of counting measurements to extinction (considering the typology of the aerosols
and thus their refractive index)- Validated during intercomparison with Caliop/Calipso measurements

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

EVID09: BAIVEC

Criteria to perform good validation studies (established from previous works with LOAC and Caliop):- Coincidence between the EarthCARE and LOAC measurements less than1 hour and less than 50 km- In case of low winds and unperturbed conditions, coincidences up to 3 hours and 100 km

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

EVID09: BAIVEC

New version LOAC available in 2024 (first test flights in December 2023):- Measurement at 4 scattering angles to better estimate the typology of the aerosols- Improved electronics to better determine the submicron particles (in particular for low concentrations)Typology reference curves
obtained in laboratory, toidentify the aerosols fromthe 3 angles channels
dedicated to typology
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

EVID09: BAIVEC

Flight strategy :- 4 locations in France to increase the probabilityof good coincidences- Aire sur l’Adour, CNES balloon base)- Orléans (LPC2E-CNRS)- Ury (MeteoModem company)- Reims (Reims University)- Instruments ready to be launched “under alert”
from the 4 locations

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

EVID09: BAIVEC

1-year campaign, total of ~45 flights
2 flights per month for 10 months (“background” monitoring)
12 or 13 flights per month for 2 x 1 month (intensive monitoring)
Main constraint: weather conditions and balloon trajectory (lower probability of flights during winter)

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

EVID09: BAIVEC

- LOAC also onboard 4 Strateole2 gondolas in 2025 for long duration flights (several months) aroundthe world in the tropical region at an altitude of 20 km.
- Possibility of validation in case of fortuitous good coincidences

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

EVID09: BAIVEC