Presentation is loading. Please wait.

Presentation is loading. Please wait.

Sentinel-4 and -5 Status and Level-2 Products

Similar presentations

Presentation on theme: "Sentinel-4 and -5 Status and Level-2 Products"— Presentation transcript:

1 Sentinel-4 and -5 Status and Level-2 Products
Ben Veihelmann, Jörg Langen, Dirk Schüttemeyer, Paul Ingmann ESA/ESTEC OMI Science Team Meeting 18 March 2014, KNMI, De Bilt, The Netherlands

2 Overview Sentinel-4: mission implementation and Level-2 products
AROMAT campaign: preparation of future validation

3 The Sentinel Missions for Copernicus Atmosphere Services
GEOstationary (GEO) Hourly revisit time over Europe Mainly air quality Diurnal cycle of tropospheric composition Sentinel-4 Low Earth Orbit (LEO) Daily revisit time global coverage Climate, air quality, ozone & UV Tropospheric & stratospheric composition Sentinel-5 Sentinel-5 Precursor

4 Sentinel-4/-5/-5P Mission Implementation
Instrument Utilization of data from Imager Infrared sounder Other Sentinel-4 UVN spectrometer (1) FCI (2) IRS (1) LI (2,*) Sentinel-5 UVNS spectrometer (3) VII (3) IAS (3) 3MI (3) Sentinel-5 Precursor UVNS spectrometer TROPOMI (4) VIIRS (5) CRIS (5,*) OMPS (5,*) (1) on MTG sounder (GEO) (2) on MTG imager (GEO) (3) on MetOp-SG (LEO) (4) on dedicated platform (LEO) (5) on SNPP/JPSS (LEO) (*) synergy on higher data level UVN = Ultraviolet + Visible + Near infrared FCI = Flexible Combined Imager IRS = InfraRed Sounder LI = Lightning Imager UVNS = UVN + Short wave infrared VII = Visible/Infrared Imager (MetImage) IAS = Infrared Atmospheric Sounder (IASI-NG) 3MI = Multi-viewing, -channel, -polarisation Imager TROPOMI = TROPOspheric Monitoring Instrument VIIRS = Visible Infrared Imaging Radiometer Suite CrIS = Cross-track Infrared Sounder OMPS = Ozone Mapping Profiler Suite MTG = Meteosat Third Generation MetOp-SG = MetOp-Second Generation SNPP = Suomi National Polar-orbiting Partnership JPSS = Joint Polar Satellite System

5 Sentinel-4/UVN Instrument
Courtesy Astrium 5

6 Sentinel-4/UVN Instrument Characteristics
Radiometric accuracy 1.8% ( nm), 2.3% elsewhere Polarisation sensitivity <0.7% Spectral features <0.05% Signal-to-Noise Ratio compliant Spatial Sampling 8 km at 45˚N Geographic Coverage Area (GCA) Europe + Sahara Repeat Cycle 1 h over Reference Area (RA) Spectral Band range [nm] resolution [nm] sampling ratio UV 0.5 3 VIS NIR 0.12 400 600 800 500 700 300 UV-vis NIR Wavelength (nm)

7 Sentinel-4 Level-2 Products
Application Comment Air Quality Climate Surface UV O3 total & tropospheric column X O3 enhanced sensitivity to lower troposphere Synergy with infrared data from IRS NO2 total & trop. column SO2 total column Also for volcanic eruption monitoring CHOCHO total column By-product CH2O total column Aerosol extinction coeff. profile, column optical depth / type / index Also auxiliary for other S4 products Synergy with imager data from FCI Cloud optical thickness, fraction, altitude Mainly auxiliary for other S4 products Surface reflectance daily map Who takes care of IRS alone products such as CO, HNO3?

8 Sentinel-4 Level-2 Performance Estimate (IUP, RAL, Noveltis)
Assumptions polluted scenario at 50˚N, 15h local time radiometric offset error small, spectral calibration successful cloud fraction up to 20% Tropospheric column O3 [%] NO2 [%] CH2O [%] SO2 [%] Error type Ran. Sys. Instrument 3 7 13 5 10 Scene (clear) 9 20 21 27 12 Scene (cloudy) 22 11 26 34 19 36 Total (clear) 25 31 Total (cloudy) 24 29 37 42 User req. 10-25 15-25 20-50

9 Sentinel-4 Level-2 Performance Estimate (IUP, RAL, Noveltis)
Assumptions: European background aerosol profile Valuable aerosol data from O2A band in morning/afternoon expected requirement User Aerosol Optical Depth Noise Error Column Total Boundary Layer 06h h h 15h h R. Siddans, STFC Rutherford Appleton Laboratory

10 Sentinel-4 Level-2 Processor Development Challenges
Tropospheric NO2 diurnal variation good precision and accuracy avoid diurnal biases!  need to account for surface anisotropy tropospheric profile stratospheric sub-column aerosol vertical distribution aerosol phase function Aerosol layer height from O2A band little heritage spectroscopy pseudo-noise mitigation spectral calibration computational speed Aerosol & surface characteristics joint retrieval from aggregated data little heritage processor architecture computational speed

11 Bi-directional Reflectance Factor, 440 nm, various surface types
Sentinel-4 Level-2 Pre-development SURMACED (BIRA, GC, LOA, IM) GPGPU (LOA, Catalyst) Objective Aerosol & surface reflectance from temporally aggregated radiance Application to real satellite measurements Validation based on real measurement Approach SURMACED (finalised): GRASP algorithm, performance demonstrated for favourable illumination conditions (summer), driver NO2 retrieval GPGPU (ongoing): Proxy data from GOCI, reference from AERONET and PARASOL GOCI on COMS Bi-directional Reflectance Factor, 440 nm, various surface types

12 Sentinel-4 Level-2 Pre-development AEROPRO (KNMI)
Objectives Aerosol layer height retrieval from O2A-band Application to real satellite measurements Validation based on collocated measurements Status GOSAT (0.016 nm) + airborne lidar  finalised GOME-2 (0.5 nm) + ground based lidar  almost finalised poster Bram Sanders GOME-2 on MetOp TANSO on GOSAT Lidar on FAAM CarbonExp Campaign 2011 Collocated GOSAT target mode airborne lidar CarbonExp Campaign 2011 CarbonExp Campaign 2011

13 Sentinel-4 Level-2 Processor Development
ITT early 2014 Build on heritage Challenges Consortium formation now!

14 Mission Elements: Sentinel–5 LEO Atmospheric Mission
Applications: air quality, climate forcing and stratospheric ozone, tropospheric chemistry Instrumentation: UV-VIS-NIR-SWIR spectrometer Use of thermal IR sounder, cloud imager and polarisation imager UV-Visible ( nm) NIR ( nm) SWIR (1590–1675nm; nm) Spectrometers with spectral resolutions between 0.25 nm and 1.0 nm Spatial sampling with 50 (T)/15 (G) km < 300nm and 15 (T)/5(G) km > 300 nm Global daily coverage Sun-synchronous Low Earth Orbit platform at 824 km mean altitude Embarked on EPS-SG, operated by EUMETSAT

15 Possible Level-2 Products from Sentinel-5 UVNS
species priority applications O3 vertical profile 1 SO, AQ, CL O3 total column SO NO2 total & trop. col. AQ CH4 total column CL CO total column AQ, CL SO2 total column 1 (1) HCHO total col. BrO total column 2 H2O total column CHOCHO total col. CO2 total column species priority applications Cloud optical depth, fraction, height 1 (2) auxiliary Aerosol absorption index 2 AQ, CL Aerosol optical depth, type 1/2 (3) Aerosol vertical profile 1/2 (2) Surface reflectance Vegetation fluorescence science SO = stratospheric ozone AQ = air quality CL = climate (1) Only observed in strongly polluted areas (volcanic eruptions, major power plants) (2) Priority 1 not as geophysical product itself, but for use in correcting retrievals of other products (3) Priority 2 for instrument development; priority 1 for Level-2 product development

16 Possible Sentinel-5-relevant Level-2 Products from other instruments on Metop-SG
IAS (IASI-NG) O3 and CO profiles SO2, NH3, CH3OH, HCOOH CH4, H2O, HNO3, PAN C2H2, HCN CFC-11, CFC-12, C2H4, N2O, HONO, CO2, volcanic ash 3MI aerosol/cirrus optical depth aerosol single scattering albedo, effective radius, refractive index surface reflectance VII (MetImage) aerosol type, effective radius, single scattering albedo cloud characterisation

17 Sentinel–5 scientific study activities
Consolidation of requirements radiometric errors (offset, scaling, spectrally varying) spatial co-registration (cloud, surface albedo impact), spatial resolution spectral resolution vs. SNR knowledge of slit function added value of O2-B band Performance assessment error budget band trade-offs (eg. 2-band vs. 3-band CH4 retrieval) vertically resolved aerosol product spectroscopic errors fluorescence

18 AROMAT (Airborne ROmanian Measurements of Aerosols and Trace gases)
Objectives To combine airborne, satellite and coincident ground activities To investigate consistency and complementarity of different measurement approaches Targets NO2, SO2, and aerosols in exhaust plumes of large power stations (Turceni and Rovinari) and around the Bucharest urban area. Setup 2 imaging DOAS, scanning lidar, NO2 sondes high pollution levels and strong gradients

19 Sentinel-4 and -5 Status and L2 Products
Ben Veihelmann, Jörg Langen, Dirk Schüttemeyer, Paul Ingmann ESA/ESTEC Thanks for listening! OMI Science Team Meeting 18 March 2014, KNMI, De Bilt, The Netherlands

20 Backup slides

21 Preliminary spectral fit-windows per Level-2 product
UV-Visible band Near Infrared band

22 Sentinel-4 Instrument on Meteosat Third Generation (MTG)
MTG-Sounder InfraRed Sounder (IRS) Sentinel-4/UVN (S4/UVN) Consecutive launches FCI flexible combined imager LI lightning imager IRS infrared sounder MTG-Imager Flexible Combined Imager (FCI) Lighting Imager (LI) UVN = UV + Visible + Near infrared

Download ppt "Sentinel-4 and -5 Status and Level-2 Products"

Similar presentations

Ads by Google