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

DEMO-3: L1 CPR transformation operator
from suborbital observations to synthetic EarthCARE CPR
Lukas Pfitzenmaier1, Nils Risse1, Pavlos Kollias1,2, Bernat Puigdomènech7, Imke Schirmacher1
FRM4Radar team:Annika Daehne1, Salomon Eliasson3, Anca Nemuc4, Razvan Pirloaga4, Ewan O’Connor5, Jonas von Bismarck6
1) University of Cologne, Germany2) Stony Brook University, NY, USA
3) SMHI, Sweden
4) INOE, Romania
5) Finish Meteorological Institute, Finland
6) Earth Observation Ground Segment Department, ESA / ESTEC,
7) McGill University, Montreal, Canada

Motivation: CPR Forward Simulator tool
INPUT: ground-based radar data, JOYCE, Jülich, Germany, 2021 April 6 (24h)Motivation:• Create database for CPR
Cal/Val• Use of existing
long term datasets• User-friendly
and quickprocessing(python)INPUT: Ground based data:• Date comparability:
ACTRIS, GEOMS, airplane• flexible satellite
configuration: EarthCAREor Cloudsat

Simulator/Pythontool

Output: EarthCARE synthetic CPR data:• Validation of L1 with ground• Creating data for L2 development• Creation of long term data sets forstatistical comparisons

OUTPUT: EarthCARE synthetic CPR data for, JOYCE, Jülich, Germany, 2021 April 6

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

Make use of cloud radar network data sets:• Coverage of different cloud and climate
regimes

Svalbard,
Cologne

SMHI,Norunda• Long term data stets – many stations with10 years or longer• Instrumental synergy with ceilometer andmicrowave radiometer• Run cloud target classification algorithm– ACTRIS Cloudnet algorithm• Validation of CPR retrievals

JOYCE, Jülich,Cologne• Make use of airplane data sets
• More direct comparison to SatelliteRadars• Data: www.cloudnet.fmi.fi
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

INOE,Magurele
Existing CloudNet station (35 GHz)
Planed CloudNet station (94 GHz)
Existing CloudNet station running a 94-GHz

What is the CPR Forward Simulator doing?
Mimic the sensor characteristics:• Introduce a surface echo (52 dBZ)
• Mimic EarthCARE CPR characteristics: resampling, weighting, integration of data

Flexibility in the applied satellite characteristics• CloudSat and EarthCARE are implemented – changes are easy to do• Specifications can also be defined and changed• PRF• Integration along track,• Range resolution

Simulate Satellite and CPR noise for Ze- and Vm [2,3,4]• Doppler velocity error due toSatellite motion
non-uniform beam filling,antenna pointing
SNR
Doppler velocity folding – vNq+/- 5.7 ms-1
• Reflectivity error

Python Code – Conversion 35 GHz to 94 GHz included [5]ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

References:[1] Lamer, et al.,2020[2] Kollias, et al., 2014[3] Kollias, et al., 2022.
[4] Delanoë, & Hogan, 2010[5] Kollias, et al., 2019[2]

Example: CPR Forward Simulator tool
JOYCE, Jülich 6th April 2021

input: measured reflectivity

Cloud boundaries aresmoothed
Loosing low level cloudstructures

symulation: reflectivity + noise

ground echo
Doppler velocity is noisy
because of Sat motion,
 low SNR non-uniform-beam filling

input: measured Doppler velocity

simulation: Doppler velocity + noise

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

Conclusion - CPR Forward Simulator toolFirst attempts for 94 GHz Microwave
Radar/Radiometer for Arctic Clouds flown on Polar 5for CloudSat (Schirmacher et al., 2023, AMT)INPUT: ground-based radar data

Extend the tool to be applicable to forward simulated
radar observations from...
• RASTA, ARM,…
So we will have, a flexible forward simulation tool forairborne and ground based data sets for EarthCARE
TO DO: documentation/publication
Plan: Radar forward simulations from NWP model
input using PAMTRA (Mech et al, 2020)

Simulator/Python
tool
OUTPUT: EarthCARE synthetic CPR data

Demonstration / questions / chat?
Meet me at the DEMO-3!
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

For any
Demonstration,questions,discussion
Meet me at the DEMO-3!
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy