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The Determination of Aerosol Optical Thickness Over Germany Using

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The Determination of Aerosol Optical Thickness Over Germany Using TheThe determinationdetermination ofof aerosolaerosol opticaloptical thicknessthickness overover GermanyGermany usingusing differentdifferent satellitesatellite algorithmsalgorithms andand instruments:instruments: aa casecase studystudy A. A. Kokhanovsky and satellite aerosol retrieval team* University of Bremen, Bremen, Germany [email protected] IntroductionIntroduction z Inter-comparison of various aerosol retrieval algorithms is performed for a single satellite scene over Germany z Used instruments: MERIS, AATSR, SCIAMACHY (ENVISAT), MISR, MODIS (TERRA), POLDER (PARASOL), OMI (AURA) z Algorithms: 1. MERIS: Bremen University/Germany, ESA/Italy, Institute of Physics/Belarus 2. AATSR: Oxford/UK, Swansea/UK, TNO/The Netherlands-FMI/Finland 3. SCIAMACHY+AATSR: DLR/Germany 4. SCIAMACHY: CNR-ISAC/Italy 5. OMI: KNMI/The Netherlands 6. MISR: JPL/USA 7. MODIS: NASA/USA, UMD/USA 8. POLDER: LOA/France Studied scene 53 52 51 latitude, degrees latitude, 50 49 7 8 9 101112 longitude, degrees Studied area Osnabruck Wolfsburg Goettingen Saarbrucken Regensburg Instruments and main algorithms N Instrument Algorithm Reference Spatial resolution Remarks of reported AOT 1. MERIS ESA Santer et al.(1999) 1x1km2 Standard ESA product 2. MERIS BAER von Hoyningen-Huene et 1x1km2 NDVI-based retrievals al.(2003) 3. AATSR AATSR-1 Grey et al.(2006) 10x10km2 Dual-view technique 4. AATSR AATSR-2 Thomas 3x3km2 Dual-view technique et al.(2007) 5. AATSR AATSR-3 Thomas et al.(2007) 3x3km2 Single-view technique 6. SCIAMACHY+ SYNAER T. Holzer-Popp (2007) 30x60km2 Single view hyperspectral AATSR measurements 7. MISR JPL Diner et al. (2005) 17.6x17.6km2 Multiple view technique 8. MODIS NASA Kaufman et al. (1997) 10x10km2 Spectral correlation technique 9. MODIS MBAER Lee et al. (2005) 1x1km2 AFRI-based retrievals 10. POLDER ESA Deuze et al. (2001) 5.3x6.2km2 11. OMI KNMI Veihelmann et al. (2007) 13x24km2 12. AATSR AT-DV Veefkind et al. (1998) 1x1km2 13. SCIAMACHY ASP Di Nicolantonio (2007) 30x30km2 14. MERIS ART Katsev et al. (2007) 1x1km2 AOD (7~12E, 49~53N) Hannover NASA MODIS L2 NASA MODIS L2 Ver 5. Ver 4. Mainz Wurzburg Nurnberg MISR L2 P195 AOT maps Mainz AATSR: Oxford, Swansea, TNO-FMI 0.7 100 220 80 200 AATSR-2 0.6 Oxford 60 180 0.5 160 DV 40 140 20 0.4 120 0 100 0.3 -20 frequency difference, % 80 -40 0.2 60 -60 40 aerosol optical thickness (AATSR-2) thickness optical aerosol 0.1 AATSR-1 Swansea DV-80 20 -100 0 0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.00.10.20.30.40.50.60.7 aerosol optical thickness (AATSR-1) aerosol optical thickness aerosol optical thickness (AATSR-1) 52.30 0.4 52.25 550nm Oxford: 3*3 52.20 0.3 Swansea:10*10 52.15 0.2 latitude, degrees 52.10 AOT(Swansea) 0.1 52.05 0.0 0.0 0.1 0.2 0.3 0.4 52.00 10.2 10.3 10.4 10.5 10.6 AOT (ATSR-DV) longitude, degrees AATSR/Oxford 0.7 0.7 τ(forward) =-0.02018+1.06875 τ(dual) τ(nadir) =0.02903+1.17882 τ(dual) R=0.85 R= 0.5 0.6 0.6 N=466 N=466 0.5 0.5 0.4 0.4 0.3 0.3 0.2 0.2 aerosol optical thickness (forward view) (forward thickness optical aerosol 8000 0.1 (nadirthickness view) aerosol optical 0.1 Nadir 7000 0.0 Forward 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.0 aerosol optical thickness (dual view) Dual 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 6000 aerosol optical thickness (dual view) 5000 4000 frequency 3000 2000 1000 0 0.0 0.2 0.4 0.6 0.8 1.0 aerosol optical thickness (AATSR) MERIS(BAER)- AATSR(Swansea) 0.5 150 500 450 BAER MERIS 0.4 400 100 350 0.3 SSA 300 50 250 0.2 frequency 200 difference, % difference, 150 0 0.1 100 AATSR-1 aerosol optical thickness (BAER MERIS) (BAER thickness optical aerosol 50 0.0 0 -50 0.0 0.2 0.4 0.6 0.8 1.0 0.0 0.1 0.2 0.3 0.4 0.5 0.0 0.1 0.2 0.3 0.4 0.5 aerosol optical thickness aerosol optical thickness (AATSR-1) aerosol optical thickness (AATSR-1) MERIS(BAER, ESA)- AATSR(TNO-FMI) 0.4 0.40 550nm 550nm 0.35 coeff. correlation: 0.35 0.3 0.30 0.25 0.2 0.20 0.15 AOT(MERIS-ESA) AOT(MERIS-BAER) 0.1 0.10 0.05 0.0 0.00 0.0 0.1 0.2 0.3 0.4 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 AOT(ATSR-DV) AOT(ATSR-DV) MERIS 0.30 443nm 550nm BAER 2000 0.25 ESA MERIS 0.20 frequency 0.15 aerosol optical thickness (BAER MERIS) 0.10 0 0.10 0.15 0.20 0.25 0.30 0.00 0.05 0.10 0.15 0.20 0.25 0.30 aerosol optical thickness (ESA MERIS) aerosol optical thickness 100 Continental BAER 10 1 Phase function Phase ART 0.1 0 30 60 90 120 150 180 Angle, deg MERIS/MODIS/AATSR 0.4 AOT(MODIS)= 0.69112*AOT(MISR)+0.0361 0.30 550nm Correlation coef=0.62 0.25 0.3 0.20 0.15 0.2 AOT(MISR) 0.10 0.1 0.05 aerosol optical thickness (NASA MODIS) thickness (NASA optical aerosol 0.00 0.00 0.05 0.10 0.15 0.20 0.25 0.30 AOT(ATSR-DV) 0.0 0.00.10.20.30.4 aerosol optical thickness (MISR) TNO-FMI 0.30 ESA MERIS ART, iterations BAER 0.25 0.20 0.15 0.10 aerosol optical thickness (MERIS) thickness optical aerosol 0.05 0.00 0.00 0.05 0.10 0.15 0.20 0.25 0.30 aerosol optical thickness (MISR) AATSR/TNO-FMI 0.4 0.30 550nm 0.25 0.3 0.20 0.2 0.15 0.10 AOT (MODIS) AOT(PARASOL) 0.1 0.05 0.0 0.00 0.0 0.1 0.2 0.3 0.4 0.00 0.05 0.10 0.15 0.20 0.25 0.30 AOT (ATSR-DV) AOT(ATSR-DV) MERIS/MISR/POLDER/MO DIS/ SCIA/OMI 100 130 100 BAER MERIS ESA MERIS 120 MISR 90 MISR MBAER MODIS BAER MERIS 110 NASA MODIS 80 80 100 0.30 70 MISR90 550nm MODIS 60 0.25 80 60 70 50 PARASOL 0.20 60 frequency 40 frequency 50 frequency 40 0.15 30 40 30 20 0.10 20 20 10 10 0.05 0 0 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.00 0.05 0.10 0.15 0.20 0.25 0 AOT(SYNAER, SCIAMACHY+AATSR) 0.0 0.1 0.2 0.3 0.4 aerosol optical thickness0.00 aerosol optical thickness 0.00 0.05 0.10 0.15 0.20 0.25 0.30 aerosol optical thickness 0.30 0.6 AOT(TERRA) MISR MISR 550nm MODIS AATSR 0.25 0.5 MODIS 0.20 0.4 0.15 0.3 AOT 0.10 0.2 0.05 0.1 13*24AOT(SYNAER, SCIAMACHY+AATSR) 30*60 0.00 0.0 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.0 0.1 0.2 0.3 0.4 0.5 0.6 AOT(TERRA) AOT(OMI) AERONET 0.8 BAER-MERIS 0.7 AATSR-2 Oxford, DV AATSR-1 SWANSEA, DV 0.6 PARASOL MISR 0.5 SCIAMACHY CNR/ISAC, Italy NASA MODIS 0.4 MBAER MODIS UMD, USA ESA MERIS 0.3 0.2 satellite aerosol optical thickness 0.1 0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 AERONET aerosol optical thickness AERONET AOT/440,670nm/ Station Position Time Hamburg 53.568N, 09:52 0.21 0.15 0.11 9.973E Helgoland 54.178N, 09:45 0.27 0.20 0.15 7.887E Cabauw 51.971N, 09:57 0.25 0.19 0.15 4.927E Den Haag 52.110N, 09:44 0.31 0.22 0.16 4.327E Leipzig 51.354N, 10:06 0.24 0.17 0.13 12.435E Mainz 49.999N, 09:58 0.42 0.31 0.24 8.300E Karsruhe 49.093N, 09:43 0.31 0.22 0.16 8.428E ISGDM_ 45.437N, 09:59 0.57 0.41 0.31 CNR 12.332E Venice 45.314N, 09:29 0.47 0.41 0.24 12.508E Bremen 53.05N, 8.78E 10:06 0.35 0.26 0.20 Statistical characteristics of retrieved AOT at 550nm for the area 9-11.5E, 52-52.5N (October 13th, 2005). Instrument/algorithm Average AOT Standard deviation MODIS/NASA&OMI 0.15 0.03 MISR/JPL 0.16 0.02 POLDER 0.16 0.04 MERIS/BAER 0.20 0.02 MODIS/BAER 0.20 0.01 MERIS/ESA 0.21 0.05 AATSR-2 0.22 0.06 AATSR-1 0.30 0.05 Conclusions There are local differences between algorithms Average values for large spatial areas of almost all algorithms are close *satellite aerosol retrieval team F.-M.
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