1. ACRI-ST | Groupe Mission OCAPI| 05/02/2016| Slide 1 OCAPI development of a level 2 simulator 05/12/2016

2. ACRI-ST | Groupe Mission OCAPI| 05/02/2016| Slide 2ACRI-ST | Groupe Mission OCAPI | 05/02/2016 | Slide 2 / X Intro  Why a simulator at this stage?  Requirement for EE9 proposal to demonstrate the mission performance  Annex 1 of EE9  Objective: to demonstrate the value of a geostationary Ocean Colour platform to analyse:  Diurnal variability of marine reflectances  Quickly changing phenomena like plankton bloom or river blooms  Improvement of daily coverage

3. ACRI-ST | Groupe Mission OCAPI| 05/02/2016| Slide 3ACRI-ST | Groupe Mission OCAPI | 05/02/2016 | Slide 3 / X How? MERIS prototype processor (MEGS) with LUT in spherical geometry  4 steps  Generation of rho_w  Simulation of rho_TOA  Inversion rho_TOA in MEGS processing chain  Data analysis To cover the range of OCAPI geometry With LUT in spherical coordinates Simulate cloud cover

4. ACRI-ST | Groupe Mission OCAPI| 05/02/2016| Slide 4ACRI-ST | Groupe Mission OCAPI | 05/02/2016 | Slide 4 / X Simulation of marine reflectances  Use the output SIGZCO project (LSIS)  Simulation of marine reflectance scenes based on Hydrodynamic model (MARS3D, IFREMER) Coupled with –sedimentary model (RHOMA) –Biogeochemical model (ECO3M) Hydrolight simulation Rrs=f(chl, TSM)  Simulation of 11 days (mai 2008 13 th to 23 rd ) covering to Rhône river plume and the Cortiou sewage outfall  MERIS bands  From 5h00 to 18h00 every hour

5. ACRI-ST | Groupe Mission OCAPI| 05/02/2016| Slide 5ACRI-ST | Groupe Mission OCAPI | 05/02/2016 | Slide 5 / X Simulation of marine reflectances  The nominal simulation of SIGZCO is at about 45°N and 5°E  To better investigate the impact of viewing and illumination geometry, the nominal hydrodynamic model will be « translated » to different areas of OCAPI disk  The rho_w will the be recalculated according to the new geometries

6. ACRI-ST | Groupe Mission OCAPI| 05/02/2016| Slide 6ACRI-ST | Groupe Mission OCAPI | 05/02/2016 | Slide 6 / X Simulation of marine reflectances  BOUSSOLE time series will also be used the generate TOA reflectances from in situ measurements of reflectances  PhD (Malika Kheireddine)

7. ACRI-ST | Groupe Mission OCAPI| 05/02/2016| Slide 7ACRI-ST | Groupe Mission OCAPI | 05/02/2016 | Slide 7 / X Simulation of TOA reflectances  Simulation of an atmosphere matching the geometry of the simulated rho_w  Use of LUT in spherical coordinates developed during ESA GeoHR project Monte Carlo Code Siro of the Finnish Meteorological Institute. Rayleigh reflectances Upward and downward transmittance Path reflectances For MERIS like aerosol assemblage (SAM)  15 (MERIS) wavelength (412 nm à 900 nm)  12 sun and view zenith angles : 0.0, 10.22295, 21.34798, 32.479012, 43.611439, 54.744419, 65.877647, 69.58876, 73.299881, 77.011009, 80.722153, 85.0  4 azimuth differences : 0.0, 45.0, 90.0, 135.0, 180.0  6 AOT at 550 nm : 0.04, 0.06, 0.13, 0.33, 0.53, 0.83  3 winds : 1, 5, 10 m.s -1 iaerModelRH (%)Boundary [ 0 - 2 km ] Troposphere [ 2 - 5 km ] [ 5 - 7 km ] [ 7 - 12 km ] Stratosphere [ 12 - 50 km ] 0MAR-9999Maritime-- 1MAR-5050MaritimeContinentalH2SO4 4MAR-9999MaritimeContinentalH2SO4 5COA-5050CoastalContinentalH2SO4

8. ACRI-ST | Groupe Mission OCAPI| 05/02/2016| Slide 8ACRI-ST | Groupe Mission OCAPI | 05/02/2016 | Slide 8 / X Inversion of rho_TOA to retrieve rho_w  Add OCAPI SNR to simulated rho_toa reflectances  Add a flag mask (EUMETSAT cloud data) from may 2008 13 th to 23 rd )   Data analyses focused on :  Diurnal variability of marine reflectances  Quickly changing phenomenons like plankton bloom or river blooms  Improvement of daily coverage

9. ACRI-ST | Groupe Mission OCAPI| 05/02/2016| Slide 9ACRI-ST | Groupe Mission OCAPI | 05/02/2016 | Slide 9 / X