Post on 21-Mar-2021
EUM/RSP/VWG/19/1072458, v1 Draft, 1 April 20191
GODAE Ocean Predict 2019
François Montagner¹, E. Kwiatkowska¹,
A. O'Carroll¹, R. Scharroo¹, S. Eastwood²,
T. Lavergne², C. Hernandez³, H. Roquet³,
A. Stoffelen⁴
Operational EUMETSAT Satellite Products and Services for Oceanography: Status and Outlook
¹EUMETSAT, Darmstadt, Germany
²Met.No, Oslo, Norway
³Météo France, Saint-Mandé, France
⁴KNMI, De Bilt, The Netherlands
EUM/RSP/VWG/19/1072458, v1 Draft, 1 April 20192
EUMETSAT and the SAF Network
HUNGARY
Member States
BULGARIA
ICELAND
AUSTRIA BELGIUM
DENMARK FINLAND
FRANCE GERMANY GREECE
IRELAND ITALY
UNITED KINGDOMTURKEY
SWEDENSPAIN
PORTUGAL
NORWAYTHE NETHERLANDSLUXEMBOURG
CROATIA
POLAND
LATVIA
SLOVENIA
ROMANIA
CZECH REPUBLIC
LITHUANIA
ESTONIA
SLOVAK
REPUBLIC
SWITZERLAND
EUMETSAT is the European Organisation for the Exploitation of Meteorological Satellites.
EUMETSAT is an intergovernmental organisation and was founded in 1986. Our purpose is to
supply weather and climate-related satellite data, images and products – 24 hours a day, 365
days a year – to the National Meteorological Services of our Member States in Europe, and
other users worldwide.
EUMETSAT operates a fleet of satellites in geostationary and polar orbit, which provide a wide
array of Earth observation data for weather, climate and environmental monitoring.
EUM/RSP/VWG/19/1072458, v1 Draft, 1 April 20193
EUMETSAT marine products stream overview
Marine Meteorology
Operational Oceanography
Marine Environment
Monitoring
Sea Surface Height
Significant Wave Height
Wind Speed
RadiativeFluxes
Wind Vectors
Sea Ice Parameters
Sea Surface
Temperature
Ocean Colour
Weather Forecasting (NWP, long term forecasts, high impact events)
Climate
Monitoring
EUM/RSP/VWG/19/1072458, v1 Draft, 1 April 20194
OLCI-A, 1-day coverage CHL_OC4ME
OLCI-A, 2-day coverage OLCI-A, 3-day coverage
OLCI-A + OLCI-B, 1-day coverage OLCI-A+OLCI-B, 2-day coverage OLCI-A+OLCI-B, 3-day coverage
Copernicus Sentinel-3A and -3B constellation is now
operational
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Sentinel-3 Sea Surface Topography Products Status
Perf factor RequirementThreshold, [goal]
S3A current status
S3B current status
Notes
Sea SurfaceHeight accuracy
10 cm – NRT[3.5] – NTC
Compliant Compliant Lowernoise than J-3
Range bias 1cm [0.25] Compliant Compliant
Significant Wave Height
4% or 20cm [1% or 5cm]
Compliant Compliant
Sigma-0 1dB [0.5dB]0.017 dB/s stability
Compliant Compliant 0.5 dB bias corrected
Wind speed 2m.s-1[1.5] Compliant Compliant
Wet tropospheric correction
2 cm [1 cm]rms
Compliant Compliant
Seal Level Anomaly (cm) from Sentinel-3A, Sentinel-3B, Jason-2 & Jason-3 off
Newfoundland, 08/05/2018
EUM/RSP/VWG/19/1072458, v1 Draft, 1 April 20196
Sentinel-3 Sea Surface Topography Products Outlook
• Level 2 products are fully operational in Near Real Time (3h
timeliness), Short Time Critical (36h), Non Time Critical (2
months) timeliness
• Level 2 improvements under study: • Better retrieval of sea ice parameters: freeboard, leads
• Improvement of wet tropospheric correction
• Sea state bias correction for SAR
• Development of a Coastal Altimetry product
EUM/RSP/VWG/19/1072458, v1 Draft, 1 April 20197
Sentinel-3 Sea Surface Topography Products Outlook
• Level 2P and Level 3 Services
• Sea Level Anomaly is operational
• L2P: Along-track corrected sea level anomalies with corrections wrt. reference ellipsoid;
• L3: Altimeter satellite along-track sea surface heights anomalies (SLA) computed with respect to a twenty-
year 2012 mean. All the missions are homogenized with respect to a reference mission – currently Jason-3.
• Adoption of along-track mean reference profile for Sentinel-3A in 04/19 (covering whole mission), planned
07/19 for Sentinel-3B
• Significant Wave Height service pre-operational, becoming operational 06/2019
• L2P: Along-track Significant Wave Height (SWH) values calibrated relative to buoys;
• L3: Mono-mission satellite-based along-track significant wave height. All the missions are homogenized with
respect to a reference mission - currently Jason-3 - and calibrated on in-situ buoy measurements.
• Improvements under way:
• Increase of resolution to 5 Hz (target date 2021)
EUM/RSP/VWG/19/1072458, v1 Draft, 1 April 20198
Sentinel-3 SLSTR Sea Surface Temperature Products
Status
Sentinel-3A SLSTR Sea
Surface temperatures in
eastern Mediterranean Sea.
Perfo.factor
Require-mentThreshold, [goal]
S3A current status
S3Bcurrent status
SST absolute accuracy
0.3K [0.1] Compliant Compliant
SST temp.stability
0.2K/decade [0.1]
Preliminary Preliminary
https://www.eumetsat.int/website/home/Satellites/CurrentSatellites/Sentinel3/SeaSurfaceTemperatureServices/index.html
Sentinel-3 SST Products are Fully Operational
Sentinel-3 SLSTR
SST – first 30
months
EUM/RSP/VWG/19/1072458, v1 Draft, 1 April 201910
Sentinel-3 SLSTR SST Products Outlook
• Reprocessed Sentinel-3A early mission data (19/04/2016 to 04/04/2018) available from
https://codarep.eumetsat.int
• Sustained validation /monitoring with in situ data
• Including Fiducial Reference Measurements: Copernicus high resolution SST buoys : data
available from http://www.jcommops.org, DBCP board, select “COPERNICUS HRSST FRM”
programme
• Evolutions
• SLSTR sea-ice surface temperature algorithm development and validation
• Planned operational introduction in 2021.
• Improvement of Cloud screening and related quality indicators
• Express Uncertainties
EUM/RSP/VWG/19/1072458, v1 Draft, 1 April 201911
Sentinel-3 OLCI Ocean Colour Products Status
Background: Sentinel-3A OLCI , 20 April 2018. RGB composite
Perf factor RequirementThreshold, [goal]
S3A current status
S3B current status
Notes
Marine reflectance@442nm
5.10-4 Not Compliant Not Compliant Within 5 - 10% uncertainty depending on water type
Water-leaving radiance
<5% Partly Compliant Not compliantLack of in situ data
Photosynthetically Active Radiation
<5% Preliminary Preliminary
Diffuse attenuation coefficient
<5% Partly Compliant Preliminary Compliance depends on value range /water type
Chlorophyll <30% [10%] Partly Compliant (meso- and eutrophic waters only)
Preliminary
Lack of in situ validation
Total Suspended Matter
<70% [10%] (case 2)
30% [10%] (case 1)Preliminary
Preliminary
Coloured Dissolved Organic Matter
<70% [10%] (case 2)
50% [10%] (case 1)Preliminary Preliminary
EUM/RSP/VWG/19/1072458, v1 Draft, 1 April 201912
Sentinel-3 OLCI Ocean Colour Products Outlook
• Products are “operational with limitations”: remove
limitations
• Apply System Vicarious Calibration to S3B
• Improve CHL retrieval algorithm
• Improve “bright pixel correction” algorithm
• Sustained validation /monitoring with in situ data
• Including Fiducial Reference Measurements
• Evolutions
• New atmospheric correction :
• Aerosol correction
• Bright pixel correction
• Express Uncertainties
• New products:
• Inherent Optical Properties;
• Fluorescence;
Sentinel-3A OLCI : chlorophyll concentration in the Adriatic sea, 22/03/2019
EUM/RSP/VWG/19/1072458, v1 Draft, 1 April 201913
OSI SAF products portfolio
• Near Real Time products and Data Records for the following ocean
and sea ice related variables :• Sea (and Lake) Surface Temperature
• Ocean Vector Winds
• Sea Ice concentration, type, edge, drift, emissivity and temperature
• Surface Short Wave and Long Wave radiative fluxes
• All information available at : http://www.osi-saf.org/
EUM/RSP/VWG/19/1072458, v1 Draft, 1 April 201914
OSI SAF SST NRT products
• LEO and GEO satellites
• Various coverage and spatial
resolution depending on satellite
and sensor
• Level 2 (“swath”) and Level 3
• Recent releases : GOES-16/ABI
SST products, combined SST/IST
products (Arctic and Antarctic)
• In the future: MTG/FCI and
METOP-SG/MetImage
EUM/RSP/VWG/19/1072458, v1 Draft, 1 April 201915
OSI SAF SST MSG data record
• Currently available : 2004 – 2012
(MSG-1 et 2)
• Hourly products available both on
latitude/longitude grid (0.05° x
0.05°) and in satellite projection
(on demand)
• Significant improvement in terms
of quality and stability compared to
NRT products
• Very well suited for diurnal
variability studies
Frequency of occurrence of diurnal cycles with an amplitude > 0.5 K
January-February-March
EUM/RSP/VWG/19/1072458, v1 Draft, 1 April 201916
OSI SAF sea-ice near-real-time products
• The Sea Ice portofolio of OSI SAF covers many variables:
• Sea Ice Concentration from SSMIS;
• Sea Ice Concentration from AMSR2;
• Sea Ice Concentration in swath (under development)
• Sea Ice Edge (3 classes: Open Water, Open Ice, Closed
Ice)
• Sea Ice Type (2 classes: First Year Ice, Multi Year Ice)
• Sea Ice Drift Low Resolution (from passive microwave)
• Sea Ice Drift Medium Resolution (from AVHRR Visible and
IR)
• Sea Ice Temperature
• Sea Ice Emissivity (at 50 GHz)
• All continuously improved, validated, and developed with
user review.
• Updated on a daily basis, in netCDF format.
Above: Example recent sea-ice drift field in the Arctic Ocean.
EUM/RSP/VWG/19/1072458, v1 Draft, 1 April 201917
OSI SAF sea-ice climate data records
• Near-Real-Time algorithms are re-used to generate Climate Data Records and their automated extensions (the Interim CDRs).
• Soon releasing v2 of the sea-ice concentration ICDR (OSI-430-b).
• We use SSMIS sensors, that are aging. We prepare for transition to EPS-SG MWI (2023). Contingency plan is to use China’s Feng Yun-3.
• Collaboration / Coordination with ESA (Climate Change Initiative) and Copernicus Services (C3S and CMEMS) to meet WMO GCOS requirements.
• Also in preparation:• Next release of SIC CDR (v3, 2021).
• Sea-ice drift CDR (2021);
Details: Lavergne et al. (2019), EGU The Cryosphere
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OSI SAF ocean vector wind products
ASCAT-A, ECMWF, MSG, 20190426 3:27 Zhttp://projects.knmi.nl/scatterometer/tile_prod/tile_app.cgi?
• Currently operationally displaying:• ASCAT-A, -B (sun synchronous@9:30/21:30 LST)
• ScatSat (sun synchronous@8:45/20:45 LST)
• Early delivery by EARS
• Climate Data Records:• ERS-1/2 (1992-2000)
• QuikScat (2000-2009
• ASCAT-A (2007-2018)
• OceanSat-2 (2009-2014)
• Scatterometers are very stable and
can detect trends < 0.1 m/s decade
• Global trends are smaller than this
• New records are being processed:• ASCAT-C (sun synchronous@9:30/21:30 LST)
• HY2A/B (sun synchronous@6:00/18:00 LST)
• CFOSat SCAT (sun synchronous@7:00/19:00 LST)
• And we expect in 2020:• WindRad on FY3E (sun synchr.@6:00/18:00 LST)
• OceanSat-3 (sun synchronous@0:00/12:00 LST)
Zonal, Meridional Errors
ERA5 - ASCAT
=> Excess mean model zonal winds (blues) => Defective mean model meridional winds (reds)
ERA5 has annual spatial error patterns similar to ERAint (only reduced in amplitude by ~20%)
<u> <v>
➢ Model atmosphere-ocean coupling and model air-sea interaction need further improvement
Mean wind speed differences to ERA5 Mean wind stress curl differences to ERA5
Eastern Tropical Pacific
Black contours are ocean velocities
Effect of Ocean Current
Before
After
→ ERA winds are relative to the fixed Earth, but ASCAT is relative to local ocean currents
→ GlobCurrent accentuates the real SST effects in ASCAT winds that are missing in ECMWF winds
→ The correction by GlobCurrentprovides much better alignment of ECMWF discrepancies with branched SEC (N and S) to show positive curl error in between
Belmonte and Stoffelen, 2019
EUM/RSP/VWG/19/1072458, v1 Draft, 1 April 201921
Conclusions
• EUMETSAT and the OSI SAF provide a range of operational satellite products serving oceanographic applications
• Main satellite contributions are coming from Copernicus missions and EUMETSAT own missions Meteosat and Metop
• The products and services evolve continuously to fulfil user needs
• User feed-back is of prime importance to us !
• Join us at the First Operational Satellite Oceanography Symposium, June 17-20, 2019, College Park (USA) https://www.eventsforce.net/eumetsat/7/home