Status S5p TROPOMI Pepijn Veefkind

Sentinel 5 precursor COPERNICUS ATMOSPHERE MISSION IN POLAR ORBIT The ESA Sentinel-5 Precursor (S-5P) is a pre-operational mission focussing on global observations of the atmospheric composition for air quality and climate. The TROPOspheric Monitoring Instrument (TROPOMI) is the payload of the S-5P mission and is jointly developed by The Netherlands and ESA. The planned launch date for S-5P is 2016 with a 7 year design lifetime. UV-VIS-NIR-SWIR nadir view grating spectrometer. Spectral range: 270-500, 675-775, 2305-2385 nm Spectral Resolution: 0.25-1.1 nm Spatial Resolution: 7x7km2 Global daily coverage at 13:30 local solar time. TROPOMI Contribution to Copernicus Total column O3, NO2, CO, SO2,CH4, CH2O,H2O,BrO Tropospheric column O3, NO2 O3 profile Aerosol absorbing index & layer height

TROPOMI in the CEOS AQ Constellation Covering the spatial regions that are not covered by the GEO’s Add products, e.g. CO, CH4, Aerosol layer height, aerosol profile. Act as a “travelling standard” between the GEOs S5P – SNPP constellation

Project Organization Instrument Level 0-1B Level 1-2 On-ground Calibration Validation

Principal Investigator Project Man. JPT (ESA-NSO) Instrument prime Airbus DS NL Calibration KNMI / SRON Airbus DS NL / TNO Level 0-1B KNMI Level 1-2 KNMI, SRON, DLR, IUP-Bremen BIRA-IASB, MPI Mainz, RAL Operations KNMI, ESOC Ground Segment DLR, KNMI Validation ESA, KNMI, SRON, ... Principal Investigator KNMI (PI), SRON (co-PI)

UVN module SWIR module

Telescope CAL unit

UVN DEMs SWIR DEM

Performance Overview UV UVIS NIR

Level 0-1B Processor Multi-threading Multi-pass Algorithms are pluggable at run-time Full error propagation (noise + systematic errors) L1B product ~25 Gbyte / 100 min S/W design can be re-used

KNMI | DLR | IUP-Bremen | BIRA | SRON | MPIC | RAL GOME-SCIAMACHY-OMI PROTOTYPE TROPOMI L2 PRODUCTS OPERATIONAL SW VERIFICATION L2 Working Group KNMI | DLR | IUP-Bremen | BIRA | SRON | MPIC | RAL

TROPOMI Data Products Product Accuracy :: Precision Ozone total column profile (incl. troposphere) trop. column TBD :: TBD NO2 10-25% :: 1·1015 mol/cm2 25-50% :: 7·1014 mol/cm2 CO 15% :: 10% CH4 1.5% :: 1% SO2 volcanic plume top. column 30-50% :: 1-3 DU Aerosol AAI aerosol layer height* aerosol optical thickness single scattering albedo <1 AAI :: 0.1 AAI 1 km :: 0.5 km 0.1 (20%) :: 0.05 (10%)0.05 :: 0.01 Cloud fraction pressure albedo Regridded NPP- VIIRS 20% :: 0.05 Product Accuracy :: Precision CH2O total column 40-80% :: 1.2·1016 mol/cm2 CHO-CHO TBD BrO HDO H2O 20% :: 10% OClO UV surface flux 10% :: 5% Surface Reflectance monthly climatology 3% :: 1% The operational data products will be developed by a collaboration of European institutes. KNMI/DLR-IMF/IUP/BIRA-IASB/SRON/MPIC/RAL/FMI

On-ground Calibration All measurements done in vacuum. Automated processing system for quick-look and key data analysis, using L0-1B processor. Calibration period of 125 days of continuous measurements. Strong involvement of KNMI/SRON: On-site science support team Data analysis team

Optical Stimulus Calibration Key Data E / S Star stimulus Geolocation E Lasers (UVN/SWIR) ISRF, Stray light E + S Echelle grating stimulus UVN ISRF Spectral filters Stray light Spectral Line Lamps Spectral calibration FEL lamp + diffuser Absolute radiometric calibration Black bodies Integrating Sphere Relative radiometry, BSDF Sun simulator Internal LEDs Detector parameters n/a Internal WLS Relative radiometry Internal laser diodes ISRF

Geophysical Validation 2014: ESA AO 2015: ESA Validation Workshop 2014: AROMAT campaign, Romania 2015: AROMAT-II campaign, Romania 2016: Max-DOAS comparison campaign, NL 2017: ESA Campaign 2018: Cabauw Cloud campaign, NL

Summary & Outlook TROPOMI will be a major step forward for atmospheric composition observations due to improved spatial resolution & sensitivity. TROPOMI will address important societal challenges: air quality, climate change, ozone layer. The on-ground calibration has been finalized, analysis ongoing. We are counting down for a launch in 2016! veefkind@knmi.nl www.tropomi.nl www.tropomi.eu sentinel.esa.int/s5p