Aerosol cci phase2 - European Space Agency · 2020. 8. 25. · Aerosol_cci > Thomas Holzer-Popp > ESA Living Planet Symposium, Bergen, 1 July 2010 slide 5 12,4 % 21,1 % 0,5 % 66,0

Aerosol_cci ECV

Aerosol_cci > Thomas Holzer-Popp > ESA Living Planet Symposium, Bergen, 1 July 2010

slide 2

Major improvements over precursor AOD datasets

Regional scoring differences between both versions (scoring grows with increased spatial + temporal

correlations and decreased bias; based on daily data)

Precursor dataset 2008 Aerosol Optical Depth maps

Aerosol_cci final dataset


slide 3

Comprehensive validation

•  Validation of pixels and gridded data; global, regional, land/ocean •  Ground-based references, fully independent

•  AOD / AE: AERONET / MAN •  Stratospheric extinction: NDAAC lidar

•  Intercomparison to other satellite datasets •  AOD/AE: MODIS, MISR, SeaWIFS, POLDER •  Stratospheric extinction + AOD: SAGE (II, III), OSIRIS, CALIOP

AOD, pixels AOD, gridded profiles, gridded


slide 4

Pixel level uncertainties


slide 5 12,4 % 21,1 % 0,5 % 66,0 %

Cloud mask consistency Aerosol_cci / Cloud_cci

5 selected days Sep 2008 – safety zone included by Aerosol_cci


slide 6

Phase 1 products

1985 1995 2005 2015

tropospheric - AOD (amount) - Angstrom (size) … with local errors

stratospheric -  extinction/AOD -  effective radius

-  absorbing aerosol index (qualitative)

2008

ATSR-2 SU

3* MERIS

AATSR SU

GOMOS

OMI

3* ATSR

focus on the best ATSR product


slide 7 1985 1995 2005 2015

AOD Angstrom fine-mode AOD aerosol „type“

stratospheric ext (!AOD)

absorbing aerosol index (use in case study)

2008

ATSR-2 AATSR (3 algorithms)

TOMS / GOME / SCIAMACHY / GOME-2 / OMI

SCIAMACHY/AATSR

GOMOS dust AOD IASI

more reference AOD (3 selected. regions) POLDER

Phase 2 plans


slide 8

Comparison to GCOS planned upgrades P2

ECV Parameter Requirement

Source

Performance CCI Phase 1

Explanatory Text (bullets)

Aerosol optical depth + Fine mode AOD, aerosol type Horizontal Resolution 5-10km

1°1000km GCOS-154 User survey

10km, 1°

Temporal Resolution 4h

500 obs./hour

GCOS-154

MACC

1 to 6 days

Typical >1000 / orbit

- depends on sensor swath; data availability limited by presence of clouds - MACC requirement for data assimilation (1 orbit = 1.7 hrs.)

Accuracy (rmse)

Max (0.03, 10%) Max (0.05, 20%) @10km

Max (0.02, 10%) @1°

0.02 @ 1000 km

GCOS-154 User survey

≥ 0.04 (ocean) ≥ 0.06 (land) ≥ 0.07 / 50% ≥ 0.02

-  12 months ACCI data compared to AERONET

-  Precursor dataset (GlobAER): 0.18 - Phase 1: 0.06 (ocean), 0.09 (land)

Stability 0.01 GCOS-154 Mean bias stable 2002-2010

Temporal extent Minimum 3-10 years User survey 1995-2012, 2015 Phase 1: 2002-2012

uncertainty on single pixels User survey provided per pixel Qualitative information so far, but appreciated by users; needs harmonization

Spectral coverage Up to 4 AODs (VIS/NIR) User survey for several sensors - to allow derivation of size information (e.g. Ångström coefficient) - sensor and algorithm dependent

Absorption: Absorbing aerosol index Horizontal Resolution 5-10km GCOS-154 0,25° - OMI pixel resolution

Temporal Resolution 4h GCOS-154 daily - coverage limited by sensor swath

Accuracy 0.03 GCOS-154 N/A - for single scattering albedo (SSA) Stability 0.01 GCOS N/A - for single scattering albedo (SSA)

Temporal extent Minimum 10 years User survey 2008 - potential time series 1979-2012

Best suited absorption parameter

Absorption Aerosol Optical Depth (AAOD)

User survey Round robin exercise for AAOD

- AAOD is under development over ocean - GCOS-154 requires SSA (difficult for low AOD); under development as a research product

(land & ocean)

Stratospheric extinction profile Horizontal Resolution 200-500km GCOS-154 2.5° x 10°

Vertical Resolution 1-2km GCOS-154 1-3km - additional: integrated stratospheric column AOD for discrimination stratospheric and

tropospheric AOD Temporal Resolution weekly GCOS-154 Monthly - determined by occultation principles and available data points

Accuracy 10% GCOS-154 10 % - comparison to SAGE-II, SAGE-III, OSIRIS – Phase 1: 10-25% Stability 20% GCOS Not yet assessed - baseline product only 1 year

Temporal extent Minimum 10 years User survey 1985-2012 - potential GOMOS time series 2003-2012 – Phase 1: 2008

All aerosol products Format NetCDF user survey NetCDF - metadata and filenames following CCI guidelines / CF1.4 convention

Updating frequency annual user survey two years - according to system specification document (phase 2) Geographic Coverage Global GCOS-154 global - except polar latitudes


slide 9

system

Expertise for validationand intercomparison

Developmentpriorities

Expertise foralgorithms

Validation / QCIntercomparisonStandard tools

Satelliteinput

Ancilliarydata

ArchiveDisseminationDocumentation

Expertise forECV use

Algorithmdevelopment

The Aerosol_cci system

Operational ECV Production system

External sciencecommunities

Spaceagencies

instrumentteams

Science Team

ExternalECV users

Referencedata

AerosolECV productsLv2 and lv3

Expertise for validationand intercomparison

Developmentpriorities

Expertise foralgorithms

Validation / QCIntercomparisonStandard tools

Satelliteinput

Ancilliarydata

ArchiveDisseminationDocumentation

Expertise forECV use

Algorithmdevelopment

The Aerosol_cci system

Operational ECV Production system

External sciencecommunities

Spaceagencies

instrumentteams

Science Team

ExternalECV users

Referencedata

AerosolECV productsLv2 and lv3


slide 10

system


slide 11

"  Network of aerosol remote sensing scientists (retrieval & validation experts, data centers, users): unfunded, open, independent, international

"  Close collaboration with related initiatives: AEROCOM (models), ICAP (forecasts), GALION (lidar) and AERONET (sun photometers)

"  Supported by scientists working with: NASA, ESA, NOAA, EUMETSAT, KNMI, DLR, FMI, ECMWF, MPI, JAXA, HUJ, METNO, LOA, CAS

"  Goals "  Promote the use of satellite aerosol data "  Achieve open and active exchange of information

"  Working groups invite your active collaboration

"  Next meeting: 27+28/09/2014, Steamboat / Colorado (with AEROCOM) "  Contacts: R. Kahn / NASA & T. Holzer-Popp / DLR

AEROSAT International Satellite Aerosol Science Network

http://aero-sat.org


slide 12

Continued from P1 •  Extend Climate Research group (stratosphere, aerosol cloud

interaction; data assimialtion through CMUG; GoeMIP indirect)

•  Valdiation tools and concepts (add assessing stability and aerosol type)

•  Round robin exercises where appropriate (IASI, several options)

•  Consistency analysis (extended, with other ECV projects)

•  Uncertainties (harmonized, with metrologists, new WG)

•  WGs: clouds (extend with international inter-comparison exercise, surface, components


slide 13

New in P2 •  Long time series production

•  Fill mission time series for all datasets •  Add IASI •  POLDER reference sites

•  User case studies

•  Sustainable but distributed system •  System engineering working group •  Common standards and tools (e.g. Versioning) •  Obs4MIPS

•  More •  Sentinel perparation •  Joint aerosol-cloud retrieval


slide 14

New in P2: case studies

AAI record for West-Africa (Tilstra et al., 2011). Red GOME-1, Brown

SCIAMACHY blue GOME-2A

EMAC moldel radiative forcing of stratospheric aerosol (Brühl et al., 2012/3

simulated regional aerosol direct radiative forcing (Kinne et al., 2013)

Changes in liquid water path due to anthropogenic aerosol (ECHAM6-

HAM2; Lohmann, et al. 2010)


slide 15

WP plan


slide 16

Recommendations •  Data standards

•  Need to get frozen to allow implementing them

•  System engineering •  Need to assure approval by science leaders for major

decisions

•  Involve ECV project in defining requirements for dissemination


slide 17

Consistency analysis

Aerosol cci phase2 - European Space Agency · 2020. 8. 25. · Aerosol_cci > Thomas Holzer-Popp > ESA Living Planet Symposium, Bergen, 1 July 2010 slide 5 12,4 % 21,1 % 0,5 % 66,0

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