ESA-JAXA Pre-Launch EarthCARE
Science and Validation Workshop

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

The ACPV activity:

Defining validation protocols for spaceborne aerosol and cloud profile products
Vassilis Amiridis, Eleni Marinou, Holger Baars, Stephanie Rusli, Rob Koopman
and the ACPV community

Validation challenges for aerosol and cloud profiling
Extremely narrow
sampling volume

Smallcorrelation
length oftarget features

Need forairborne in-situ
measurementsof microphysicalproperties
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

Need for synergies tovalidate higher levelproducts

ProductDiversity

Gaps inspaceborne
data records

EarthCARE and AOS scientists’ recommendations
1. Need for convergence oncommon Cal/Val practices
acknowledging:

ACCP (now AOS) 2nd Suborbital Workshop, April 2021••••

Lessons learned
Methods and approaches
In-orbit & pre-launch validation
Airborne campaigns & networks

2. Consolidation of best practices ina CEOS level document•

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

There is no CEOS document for profilers(validation documents include at themoment Soil Moisture, Biomass, Albedo,LST, LAI and oceanographic parameters)

Building a network for common/best Cal/Val practices
ACPV:
100 scientists fromSpace Agencies,
CALIPSO, Cloudsat,Aeolus, EarthCARE,
AOS missions
ResearchOrganizations, RIs,
airborne facilities,
international
networks
Support of the networking activities

Foster community convergence: 45 community meetings organizedDocument the consensus for CEOS: 7 chapters are being writtenEstablish a core implementation group

Promote the implementation of ACPV best practices in the wider communities:
conference presentations, Special Issue in AMT

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

Progress on CEOS document implementation
ACPV Document Chapters
Ch1. Introduction
Ch2. Validation needs for Space Profilers
Ch3. Survey of validation measurements
Ch4. Correlative metadata and data format
Ch5. Guidance for validation
Ch6. Near-real time validation through data assimilation
Ch7. Knowledge and data gaps

2022
Q4

Progress by chapter

2023
Q1

Q2

2024
Q3

Q4

Q1

Q2

Reviews fromCommunity Community Community Community
Firstappointed
ToC and author list
meetings and meetings and meetings and meetings and document to Reviewers
finalized
writing
writing
writing
writing
be delivered and Cal/Val
teams

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

Q3
Revisions

Q4
Finalversion
delivered toCEOSCEOS document - ContentChapter 1: Introduction[Vassilis Amiridis, Dan Cecil, Rob Koopman]• Overview of past, present, future space missions for aerosol, cloud and precipitation profiling• Validation objectives for space profilers• Cal/Val definitions/nomenclature and validation metrics

Chapter 2: Validation needs for Space Profilers[Luca Baldini, Tristan l’Ecuyer, Hajime Okamoto]• Detailed list of products from space profilers• Uncertainties in satellite observations• Validation needs from the product developer perspective
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

CEOS document - Content
Chapter 3: Survey of validation measurements[Jens Redemann, Silke Gross]• Types of validation instruments• Quality of measurements• Spatiotemporal representativeness

Chapter 4: Correlative metadataand data format[Ewan McGregor, Ann MariFjæraa, Michael Shook, GiriPrakash, Lucia Mona]• Guidelines on EVDC and how to upload
datasets to the Cal/Val archive (see also thetalk of Ann Mari)ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

CEOS document - Content
Chapter 5a: Guidance for Validation: Aerosols[Eleni Marinou, Simone Tannelli]• Guidelines for sub-orbital aerosol measurements• Suggested QA/QC procedures• Spatiotemporal criteria

Chapter 5b: Guidance for Validation: Clouds[Dmitri Moisseev, Eleni Marinou, Simone Tannelli]• Guidelines for sub-orbital cloud precipitation measurements• Suggested QA/QC procedures• Spatiotemporal criteria
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

CEOS document - Content
Chapter 6: Near-real time
validation through dataassimilation[Marta Janiskova, Isaac Moradi]• Observation simulators• Validation through monitoring• Demonstration of monitoring benefits

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

CEOS document - Content
Chapter 7: Knowledge
and data gaps
[Holger Baars, Pavlos
Kollias, Jay Mace]

Gap

Description

Foreseen solution
GeneralSpatiotemporal
representativen
ess

How representative is a ground based Analyze Cabo Verde data as an example
station with respect to theand compare statistics with CALIPSO on
surrounding
different validation radii.
Aerosol profiling-related• Under-sampled areas

Wavelength
dependence ofaerosol mixtures• Harmonization aspects on
different datasets,wavelengths andparameters for bridging
missions towards delivering
multi-mission climate datarecords

We have a good data set of opticalproperties at different wavelengths
for specific, mostly pure aerosol types(e.g. ACTRIS). But we have not yet
this information fully available foraerosol mixtures.

Cloud and precipitation profiling related
Validation of CPR Since EarthCARE is the first Doppler
Develop a method to derive terminal
velocity products radar in space, there are no methods fall velocities of raindrops from dualpreviously developed for thepolarization weather radar
validation of spaceborne Doppler
observations.
radar observations.

• Open issues in Cal/Val

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

Identify frequent aerosol mixtures.
Calculate optical properties based on
mixing rules and mixing state out of
optical properties from pure types.
Compare to existing high quality
observations, e.g. ACTRIS.

ACPV studies
Three (3) selected studies on historical data tofill gaps identified in ACPV:

More on the talk of Dmitri Moisseev (Friday morning)

1. Validation of CPR Doppler velocity and fallvelocity products (Led by FMI, contributions
from CNR, NOA)
2. Validation of Level 1 lidar products withground-based systems using the CARDINAL
level 1 tool (Led by NOA)

P. Pachou: Use of eVe ground-based lidar measurements from eVe ESA
lidar system to reproduce EarthCARE L1 through the EarthCARE simulator

3. Spatiotemporal aerosol representativenessbased on ground-based observations andCALIPSO (Led by TROPOS, contributions
from NOA)ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

Spatiotemporal aerosol representativeness
Concentric cycles of 20-200 km radius with increment 20km around the ground-based lidar station of PANGEA

Average re-gridded CALIPSO profiles within
the circles [2006 – 2021]

CALIPSO
Totalextinction

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

Dustextinction

CVs for EarthCARE Cal/Val ground-based lidar stations
Coefficient of Variation for EarthCARE Cal/Val stations

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

CVs for EarthCARE Cal/Val ground-based lidar stations
Coefficient of Variation for EarthCARE Cal/Val stations (free troposphere)

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

Concluding remarks• The ACPV targeted studies are ongoing and will be concluded and delivered within the next months
in the framework of the ESA activity• Suborbital-to-orbital transformation tools are under preparation• Studies and tools along with guidelines for the validation of aerosol and cloud profiles will beconsolidated and delivered to the Cal/Val teams by Q1 of 2024 and to CEOS by the end of 2024
• The ACPV community effort is ongoing and remains open to new members!

Thank you for your attention

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

Spatiotemporal aerosol representativeness
Mean AOD & DOD for different radii around PANGEA

Coefficient of variation (CV)
CV is a measure of the aerosol spatial
variability around a monitoring station,
defined as the ratio of the standard
deviation to the AOD mean (Anderson etal., 2003; Shinozuka and Redemann, 2011).

𝑪𝑪𝑪𝑪 =𝑺𝑺𝑺𝑺𝑨𝑨𝑨𝑨𝑨𝑨
× 𝟏𝟏𝟏𝟏𝟏𝟏𝟏
𝑴𝑴𝑨𝑨𝑨𝑨𝑨𝑨For example, the CV for PANGEA is ~4%
which is very low and as such we assume
that the station can be used for several
overpasses in the range of 200 km.

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

Spatiotemporal aerosol representativenessImpact of sampling:
Total number of CALIPSO profiles for each month and year from 2006 to 2021 and for different radius

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