Outline: Method Preliminary results Future

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Outline: Method Preliminary results Future Inter- and Absolute-calibration of AATSR/ MERIS reflectance channels Caroline Poulsen,Tim Nightingale and Phil Watts Outline: Method Preliminary results Future Point of contact: c.a.poulsen@rl.ac.uk co-PIs: Carsten Brockmann Ass(MERIS scene identification)., Dave Smith(calibration scientist), Anthony Baran(Ice particle phase functions)

Inter- and Absolute-calibration of AATSR/ MERIS reflectance channels Data products so far 5 scenes received from MERIS so far 10/21, 10/22, 10/23 ,11/16 2 colocated AATSR scenes 10/23 ,11/16 not all are suitable for analysis, no good stratus scene at present. Data tools and analysis LUTs have been generated for the baseline and error analysis cases. Tools to read AATSR and MERIS developed and tested Analysis routine has been adapted Preliminary results

Inter- and Absolute-calibration of AATSR/ MERIS reflectance channels A 4 layer model has been developed to generated look up tables of atmospheric properties such as reflectance and transmittance as a function of cloud optical depth and particle size Layer 1:Stratospheric aerosols Layer 2:Rayleigh scattering Layer 3:Cloud Layer 4:Rayleigh scattering and aerosols The Model which uses DISORT can be changed to vary the height of the cloud layer, the concentration of aerosols or another cloud layer can be added to test the sensitivity of the results to different factors

Inter- and Absolute-calibration of AATSR/ MERIS reflectance channels INTERCALIBRATION of visible channels 0.55 0.67 and 0.87. The 1.6 channel cannot be calibrated this way because it is sensitive to particle size Method 1: Tropical (deep) convection Optically thick, spectrally ‘neutral’ cloud 15 -18 Km Cloud optical depth not known, absolute calibration not possible (unless ‘saturation’ proves reliable). Well defined spectral characteristics allows inter-channel calibration. Optically thin atmosphere above cloud Non-reflecting surface Ocean

Scene pre-selection by Brockmann Ass. (January-June shown)

Inter- and Absolute-calibration of AATSR/ MERIS reflectance channels Method 1: Tropical (deep) convection AATSR 0.55/0.67 calibration 23/10 measurements calculations + without ozone correction With ozone correction derived from ECMWF profiles  with ozone correction

Inter- and Absolute-calibration of AATSR/ MERIS reflectance channels Method 1: Tropical (deep) convection AATSR 0.55/0.67 calibration 23/10 MERIS 0.55/0.67 calibration 23/10 Currently with ozone correction. This method has an accuracy of 1-2%

Method 2: Arctic Stratus + Dual view Forward scattering + Oblique path = High reflectance Side scattering + nadir path = Low reflectance ABSOLUTE calibration of visible channels ATSR along- track view ATSR nadir view Stratus: homogeneous, ‘single layer’: not too thick! Ocean: black High Northern latitude, descending node +90 secs Rayleigh layer + aerosol?

Scene pre-selection by Brockmann Ass. Solar geometry is very important in this case May/Jun/Jul Apr/Aug Mar/Sept Feb/Oct Jan/Nov Dec

ATSR-2 Method 2: Arctic Stratus + Dual view: 1.6 mm calibration missing a 1.3 factor Inc. CO2 absorption DISORT reflectances for t = 1-32, Re = 4-16

ATSR-2 Method 2: Arctic Stratus + Dual view : 1.6 mm ATSR-2 Including missing 1.3 factor Inc. CO2 absorption

ATSR-2 Method 2: Arctic Stratus + Dual view :- 0.55 mm

Inter- and Absolute-calibration of AATSR/ MERIS reflectance channels Future Proper error analysis. More scenes, especially more stratus scenes. Colocation with MERIS data. Presentation of results. Produce calibration figures.