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AEROCOM workshop, Paris, 2-3 June, 2003
ATSR-2, AATSR, GOME, SCIAMACHY, OMI
1
TNO Physics and Electronics Laboratory
ATSR-2, AATSR, GOME, SCIAMACHY, OMI
Gerrit de Leeuw
with contributions from Thomas Holzer Popp and others
AEROCOM workshop, Paris, 2-3 June, 2003
ATSR-2, AATSR, GOME, SCIAMACHY, OMI 2t
Aerosol retrieval
• Cloud detection• Separate surface contributions
• Separate Rayleigh contributions• Choice of aerosol type and distinction between aerosol types
• Particle size distribution
• Complex refractive index
• Mixture: external or internal
• Minimizing error function to determine optimum mixture
• Provides: • Aerosol Optical Depth (AOD)
• Angstrom coefficient
• Aerosol type mixing ratio
• Aerosol index (AI)
ATSR
AEROCOM workshop, Paris, 2-3 June, 2003
ATSR-2, AATSR, GOME, SCIAMACHY, OMI 3t
Aerosol retrieval algorithms
• Single view: • Nadir
• Forward
• Dark surfaces
• Over water:
• Correction for whitecap cover [f(u)], chlorophyl
• Sunglint
• Fresnel reflection
• Dual view• Eliminates land surface contributions
AEROCOM workshop, Paris, 2-3 June, 2003
ATSR-2, AATSR, GOME, SCIAMACHY, OMI 4t
ATSR-2• AOD retrieval over Europe from ATSR-2
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.60.0
0.5
1.0 (d)
Wavelength (µm)
0.0
0.2(c)
0.0
0.5
1.0 (b)
Ae
roso
l Op
tica
l De
pth
0.0
0.5
1.0
ATSR-2 retrieval
Sun/sky radiometer
(a)
• Evaluation with Sunphotometer data (AERONET, PHOTONS)
• C. Robles-Gonzalez, J.P. Veefkind and G. de Leeuw, G R L 27, 955-959, 2000.
August 1997
AEROCOM workshop, Paris, 2-3 June, 2003
ATSR-2, AATSR, GOME, SCIAMACHY, OMI 5t
Ångström ParameterÅngström Parameter
• Aerosol Optical Depth:
• AOD (λ) = λ-α
λ wavelength
α Ångström parameter
Particle size distribution:
dN/dD = D-ν
ν Junge exponent
ν = α + 3
Ångström Parameter is not
independent of wavelength
0.01
0.1
1
100 1000 10000Wavelength (nm)
AO
D
AEROCOM workshop, Paris, 2-3 June, 2003
ATSR-2, AATSR, GOME, SCIAMACHY, OMI 6t
ATSR-2: INDOEX
• Mixture of continentally influenced and sea salt aerosol
• Minimizing error function to determine optimum mixture
• Provides: • AOD
• Angstrom coefficient
• Mixture
• Over the ocean the mixture gradually changes from continental to sea salt
Robles Gonzalez et al., 2003
AEROCOM workshop, Paris, 2-3 June, 2003
ATSR-2, AATSR, GOME, SCIAMACHY, OMI 7t
ATSR-2: SAFARIAugust 2000 September 2000
Robles Gonzalez et al., 2003
AEROCOM workshop, Paris, 2-3 June, 2003
ATSR-2, AATSR, GOME, SCIAMACHY, OMI 8t
TEMIS activities• Conversion scientific to operational algorithm
Integration of different routines in a single algo:
ATSR-2, AATSR
• Application on regional scale (Europe and European seas)• Testing for 2000 over Europe
• Evaluation with AERONET data
• Presentation on TEMIS website
• Implementation DV&SV algos at KNMI:
• AOD over Europe, end 1995-early 2001
NORFA course, Hyytiala, Finland, 18-22
Remote sensing of aerosols 9t
Global Ozone Monitoring ExperimentGlobal Ozone Monitoring Experiment
• Spectrometer on ERS-2
• Wavelength range 0.240 to 0.790 µm
• Spectral resolution 0.2 to 0.4 nm
• Pixel size 320x40 km2, in validation phase 80x40 km2
Retrieval:• Five wavelength bands between 0.340 and 0.400 µm, width 1 nm
• Albedo of land surfaces is low
• Assumptions are made on surface albedo
• Bi-modal aerosol model
NORFA course, Hyytiala, Finland, 18-22
Remote sensing of aerosols 10t
GOME August 1997GOME August 1997
NORFA course, Hyytiala, Finland, 18-22
Remote sensing of aerosols 11t
Comparison of retrieval methodsComparison of retrieval methods
0
0.2
0.4
0.6
0.8
1
GOME
ATSR-2
AE
RO
SOL
OPT
ICA
L D
EPT
H
(a)
48 49 50 51 52 53 54
0
0.1
0.2
0.3
0.4
G O M E A TS R -2
(a) D e B ilt
(b ) L ille
AE
RO
SO
L O
PT
ICA
L D
EP
TH
AE
RO
SO
L O
PT
ICA
L D
EP
TH
W A V E LE N G T H (µ m )
0
0.2
0.4
0.6
0.8
0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8
AEROCOM workshop, Paris, 2-3 June, 2003
ATSR-2, AATSR, GOME, SCIAMACHY, OMI 12t
Synergetic aerosol retrievalDr. Thomas Holzer-Popp
and Marion Schroedter
German Aerospace Center (DLR)German Remote Sensing Data Center (DFD)
Climate and Atmosphere ProductsPhone: +49-8153-28-1382
Email: [email protected]
AEROCOM meeting
June 2003
AEROCOM workshop, Paris, 2-3 June, 2003
ATSR-2, AATSR, GOME, SCIAMACHY, OMI 13t
- SYNAER uses GOME/ATSR-2 or SCIAMACHY/AATSR- SYNAER delivers AOT and type over land and ocean- spatial resolution: 80x40 km2 / 60x30 km2
- temporal resolution: weekly coverage (ENVISAT), only 3 days per month from ERS-2
- data acquisition through ESA AO projects (operational from 2004)- available: “3 day” climatology 7/1997-8/1998 Europe/Africa,
selected episodes 1995-2003 global- to be negotiated with ESA: “3 day” climatology for 2000- regular global monitoring planned from 2004 - backprocessing of ENVISAT data is possible up to mid 2002
AEROCOM workshop, Paris, 2-3 June, 2003
ATSR-2, AATSR, GOME, SCIAMACHY, OMI 14t
Based on SYNAER evaluation of GOME / ATSR-2 dataJuly 1997 – March 1998 (3 days per month), extension to Aug 19985 x 5 degree grid
Limitation:3 days per month onlyCloudinessBright surface albedo
Quality check / ambiguity test:Surface albedo 670 nm less than 0.07 (0.015) over land (ocean)Cloud fraction in GOME pixel less than 50%Fit error GOME spectrum less than 0.025Number of contributing orbits per box 2 or more (mean: 4)Number of contributing GOME pixels per box 5 or more (mean: 19)Component analysis only for AOT > 0.1
AEROCOM workshop, Paris, 2-3 June, 2003
ATSR-2, AATSR, GOME, SCIAMACHY, OMI 15t
SYNAER aerosol retrieval
ATSR delivers aerosol optical depth and surface albedo but needs aerosol type.
GOME delivers aerosol type, but needs aerosol optical depth and surface albedo first.
-> combined retrieval
aerosol type
pretabulated radiative transfer
calculations
aerosol optical thickness
selection of most probable mixture
40 aerosol mixtures ATSR dark field method
40 albedo/aerosol optical depthfor all possibleaerosol mixes
40 simulated spectra
measured spectrum
Holzer-Popp, et al.JGR 107, D21 (2002)
AEROCOM workshop, Paris, 2-3 June, 2003
ATSR-2, AATSR, GOME, SCIAMACHY, OMI 16t
IN WA SO SA SC MT
components
Αεροσολ ΟΤ ανδ χοµπονεντ µαπσφροµ ΓΟΜΕ/ΑΤΣΡ−2 (ΣΧΙΑ/ΑΑΤΣΡ)
0.0 0.2 0.4 0.6 0.8 1.0AOT AERONET
1.0
0.8
0.6
0.4
0.2
0.0A
OT
SY
NA
ER
0.0 0.5 1.0
aerosol optical Thicknes 550 nm
Case study validation against AERONET sunphotometers from 340 to 870 nm indicatesto selecting the right aerosol OT and mixture
Europe 1-3 September 1995full resolution OT map (right)
component map (below)
T. Holzer-Popp and M. Schroedter, DLR-DFDMethod and case study validation published in: JGR 107 (2002), D21 and D24
IN=insoluble, WA=watersoluble, SO=soot, SA=sea salt accumulationmode, SC=sea salt coarse mode, MT=mineral transported
AEROCOM workshop, Paris, 2-3 June, 2003
ATSR-2, AATSR, GOME, SCIAMACHY, OMI 17t
ΑΑΙ = −100(λογ(Ρ335/Ρ380)_µεασ − λογ(Ρ335/Ρ380)_Ραψ)
Σεε αλσο ποστερ ατ σεσσιον ΑΣ14:
∋Γλοβαλοβσερϖατιον οφ Υς−αβσορβινγ αεροσολσ φροµ
Αβσορβινγ αεροσολ ινδεξ (ααι) ρετριεϖαλ φροµ Σχιαµαχηψ ανδ ΓΟΜΕ
Μαρτιν δε Γρααφ ανδ Πιετ Σταµµεσ, ΚΝΜΙ
δυστ αεροσολσοϖερ τηε Σαηαρα
βιοµασσβυρνινγ αεροσολσ οϖερ Βορνεο
προβαβλψ ατηροπογενιχ αεροσολ
AEROCOM workshop, Paris, 2-3 June, 2003
ATSR-2, AATSR, GOME, SCIAMACHY, OMI 18t
Αεροσολ χλιµατολογψ οφ Σαηαρα δεσερτ δυστ φροµ ΓΟΜΕ δατα. Ηερε τηε αϖεραγε ϖαλυε οφ δεσερτ δυστ ισ ρεπορτεδ φορ ϑυνε 1997. Τηε ψελλοω−ρεδ ρανγε ινδιχατεσ τηε πρεσενχε οφ δεσερτ δυστ εϖεντσ εµβεδδεδ ιντο α µαριτιµε αεροσολ ανδ ρεσιδυαλ χλουδσ (λιγητ βλυε). (Ρ. Γυζζι )
AEROCOM workshop, Paris, 2-3 June, 2003
ATSR-2, AATSR, GOME, SCIAMACHY, OMI 19t
SCIAMACHY:Approach over land
Reflectances at TOAmeasured by SCIAMACHY
Cloud screeningGas absorption correction
Surface correction GOME surface reflectances database
+EOF method for a given region
Rayleigh correction Aerosol reflectance
LUT of aerosol reflectancesfor a given satellite and solar
geometry
The best fit with aerosol model
AODJolanta Kusmierczyk-Michulec
Scheme tested with GOME data
AEROCOM workshop, Paris, 2-3 June, 2003
ATSR-2, AATSR, GOME, SCIAMACHY, OMI 20t
OMI (EOS Aura, Jan 2004)
Correction for surfacealbedo
Compute Aerosol indices
CLOUD/GLINTscreening
Select Aerosol Models
Near-UV MethodMulti-Wavelength
Method
Compute Output
OMI / MODIScloud product
GeographicalDistribution
database
LUT
SurfaceReflectance
Database
INPUT
Torres, Decae, Veefkind & De Leeuw, OMI ATBD, 2002
AEROCOM workshop, Paris, 2-3 June, 2003
ATSR-2, AATSR, GOME, SCIAMACHY, OMI 21t
Summary• Satellite aerosol retrieval products (AOD, type, Angstrom
coefficient, AI) are becoming available:• ATSR-2/AATSR (1x1 km2)
• 5 months available
• ATSR-2 for 2000 over Europe (with hopes for 1995-2001)
• Other areas feasible
• ATSR-2 series continued with AATSR
• Available on TEMIS web site
• GOME• GOME over water product (Guzzi) on TEMIS web site
• SYNAER• SYNAER (GOME/ATSR-2) climatology (Holzer Popp)
• Continued with SYNAER (SCIAMACHY/AATSR)
• SCIAMACHY global product• OMI global product• Synergistic use of satellites • Needs validation/evaluation
AEROCOM workshop, Paris, 2-3 June, 2003
ATSR-2, AATSR, GOME, SCIAMACHY, OMI 22t
Acknowledgements
CREATE (EVK2-CT-2002-00173) and DAEDALUS (EVK2-CT-2002-00174) are supported by EU-FP5.
Aerosol retrieval work at TNO-FEL is supported by internal funding and by external funding from the
Netherlands Space Research Organisation (SRON), NIVR, and ESA-ESRIN. ATSR-2 and GOME data are provided by
the European Space Agency (ESA) through DLR and ESRIN.