MERIS-(A)ATSR workshop, ESRIN – 28th September 2005 MEDSPIRATION A European Contribution to the GODAE/GHRSST-PP JF Piollé (IFREMER), Ian Robinson (SOC), Pierre Leborgne (Meteo-France) & al
Dec 25, 2015
MERIS-(A)ATSR workshop, ESRIN – 28th September 2005
MEDSPIRATION A European Contribution to the GODAE/GHRSST-PP
JF Piollé (IFREMER), Ian Robinson (SOC), Pierre Leborgne (Meteo-France) & al
MERIS-(A)ATSR workshop, ESRIN – 28th September 2005
Project background
The GODAE / GHRSST-PP project Delivering a new generation of global and multi-sensor high resolution SST
datasets, as defined by the GHRSST Science Team, reflecting a general consensus opinion (format, content, processing)
Distributed approach for the operational production and dissemination of GHRSST data products : Regional Data Assembly Center
Regional areas Specific sensors
Same processing model => products can be used individually or together with equal confidence
Sponsored by the European Space Agency Support the GHRSST-PP Fund the European node for the GHRSST-PP system : Medspiration (invitation
to tender issued end of 2003)
MERIS-(A)ATSR workshop, ESRIN – 28th September 2005
Medspiration partnership
A European consortium involving major institutions
ESA/DUE
O.Arino
Medspiration consortium
Project managementIan S.Robinson (Manager), SOC - J.F.Piollé (Deputy), IFREMER
core memberssystem design, implementation, operations
L2P productP.Le Borgne, Météo-France
L4 productG.Larnicol, CLS
support
Project management/qualityJ. Rickards, Vega
Expertising (L4 product)L.Santori, B.Bonjourno, CNR
Test users
Archive, dissemination,MDB and L4 processingJ.F.Piollé, IFREMER
HR-DDSD.J.Poulter
L2P, L4 productsL.Santori, B.Bonjourno, CNR
L2P productsS.Eastwood, MetNo
L2P processing softwareA.Coat, Avelmor
MERIS-(A)ATSR workshop, ESRIN – 28th September 2005
Requirements of Medspiration
Delivery of real-time high quality SST data, matching the GHRSST-PP model
Operational and sustained production Generic and scalable system Products :
Direct observations (L2P)
Gap free high resolution maps (L4)
Match-up database (MDB)
High-resolution diagnostic datasets
MERIS-(A)ATSR workshop, ESRIN – 28th September 2005
IR radiometers Polar orbiting and
geostationnary satellites Skin SST (10-20 µm) Cloud, aerosol contamination Affected by diurnal cycle
(warming) High resolution (10km > 1km)
Satellites/sensors considered within Medspiration
MSG/SEVIRIENVISAT/AATSR
NOAA16&17/AVHRR
AQUA/AMSR-E
TRMM/TMI
MERIS-(A)ATSR workshop, ESRIN – 28th September 2005
MW radiometers Polar orbiting Subskin SST (~1 mm) Rain contamination, no data
close to land Affected by diurnal cycle
(warming) Low resolution (25km) Poor sampling in some areas
Satellites considered within Medspiration
MSG/SEVIRIENVISAT/AATSR
NOAA16&17/AVHRR
AQUA/AMSR-E
TRMM/TMI
MERIS-(A)ATSR workshop, ESRIN – 28th September 2005
sensor error bias and rms
proximity confidence valueconfidence flag
distance to climatorejection flag
Assembling the L2P products
Collect L2 files at various providers
Format homogenization (netcdf)
Time & geolocation homogeneization
Map ancillary data
Quality control
Calculate confidence
Assign sensor error bias and rms
other infotime-geolocation
sea-surface temperatureL2
product
SSI
surface solar irradiance icesea-ice fraction
AOD
aerosol optical depth
wind
wind speed
L2P product
time-geolocation sea-surface temperature
MERIS-(A)ATSR workshop, ESRIN – 28th September 2005
Generated L2P products
L2P production restricted to Atlantic, initial focus on Mediterranean
!! various sampling patterns depending on the provider (swath, grid, list of valid points) !!
product provider Resolution Volume/day
ATS_NR_2P ESA 1 km 3.6 Gb
AVHRR16/17-G PO.DAAC 9 km 84 Mb
SEVIRI SAF O&SI 10 km 470.4 Mb
AMSRE REMSS 25 km 25.2 Mb
TMI REMSS 25 km 18.9 Mb
product provider Resolution Volume/day
AVHRR16/17-L PO.DAAC 1-2 km 75.6 Mb
NAR16/17 SAF O&SI 1-2 km 336 Mb
Soon extended to global coverage (October)
MERIS-(A)ATSR workshop, ESRIN – 28th September 2005
L4 product
Objective : high resolution gap free maps of SST fundationRemoving the diurnal variability : correction using a model (with
respect to the history of the SSI and wind in the day)
Selecting night data
Filling the gaps : Optimal interpolation Merging sensors (high resolution IR and
low resolution MW)
MERIS-(A)ATSR workshop, ESRIN – 28th September 2005
Generated L4 product
Focused area : Mediterranean sea, 2km resolution, daily But software package easily configurable and scalable => intended to play a
key role within Mersea for cooperative work, to cover other regional areas
MERIS-(A)ATSR workshop, ESRIN – 28th September 2005
MDB Records
Rely on CORIOLIS for in situ data collection (incl. drifting buoys and meteo data from GTS) Single access Benefit on QC Daily delivery of new incoming data
Colocation 6 hours 25 km In situ profiles down to 100m
Will feed a centralized Matchup database (GHRSST-PP)
Derivation of single sensor error statistics by GHRSST-PO on a regular basis => bias and rms with respect to the confidence value
MDB database implemented at Ifremer Web user interface for data extraction soon
available
Rely on CORIOLIS for in situ data collection (incl. drifting buoys and meteo data from GTS) Single access Benefit on QC Daily delivery of new incoming data
Colocation 6 hours 25 km In situ profiles down to 100m
Will feed a centralized Matchup database (GHRSST-PP)
Derivation of single sensor error statistics by GHRSST-PO on a regular basis => bias and rms with respect to the confidence value
MDB database implemented at Ifremer Web user interface for data extraction soon
available
colocation process
colocation process
MDB records
L2P and L4 products
MERIS-(A)ATSR workshop, ESRIN – 28th September 2005
HR-DDS
High resolution diagnostic datasets sub scenes for a set of predefined
small areas (typically 2° x 2°) from every L2P SST and L4 dataset
extraction and resampling onto a 0.01° grid
HR-DDS sites defined by GHRSST-PP (mooring location,..).
A tool to allow intercomparison of the characteristics of the SST derived from different sensor types, in order to facilitate the research needed to test and improve the data merging methods used in GHRSST-PP.
High resolution diagnostic datasets sub scenes for a set of predefined
small areas (typically 2° x 2°) from every L2P SST and L4 dataset
extraction and resampling onto a 0.01° grid
HR-DDS sites defined by GHRSST-PP (mooring location,..).
A tool to allow intercomparison of the characteristics of the SST derived from different sensor types, in order to facilitate the research needed to test and improve the data merging methods used in GHRSST-PP.
MERIS-(A)ATSR workshop, ESRIN – 28th September 2005
System architecture
optimal interpolation DV correction
Product consolidation
colocation
Users
in situ data
GDAC
L2P
L2
ancillary dataancillary data
UHR/L4
internet
L2
Extern data centersarchivingsystem
MMR MDBL2P
MDB records
MMR-FR
L2P
L2P, UHR/L4
HR-DDS extraction
HR-DDS
internet
MERIS-(A)ATSR workshop, ESRIN – 28th September 2005
Product dissemination
Format All L2P, L4, HR-DDS : netcdf format, complying to GHRSST-PP specifications MDB records : XML format (on demand)
Timeliness L2P : delivery in near-real time, at latest day+1, 7:00 L4 : run each day at 7:00 UTC, required delivery before 12:00 (current mean
processing time : 50 min) HR-DDS, MDB records : daily
MERIS-(A)ATSR workshop, ESRIN – 28th September 2005
Online access
Medspiration web site http://www.medspiration.org User help desk : [email protected] ([email protected])
Dissemination facilities FTP push (on demand) FTP server, last 3 months of data, free access (anonymous login)
ftp://ftp.ifremer.fr/ifremer/medspiration/data OpenDAP (aka DODS) server
http://www.ifremer.fr/cgi-bin/nph-dods/data/satellite/medspiration Live Access Server
http://www.ifremer.fr/las (L4 product only)
Web tools Data and operation status page HR-DDS browser L4 validation browser
MERIS-(A)ATSR workshop, ESRIN – 28th September 2005
Project milestones
Implementation phase : 2004 Operation
Started April 2005, funded until 2007 System extension
AVHRR-16/17 NAR product > European Area AATSR global : October 2005
User consultation Collect user feedback and requests, assess quality of service
Product format and content Data quality and accuracy Delivery, availability issues User information
Hold every 6 months 2nd user consultation : 13th December, at IFREMER
MERIS-(A)ATSR workshop, ESRIN – 28th September 2005
Plans
Medspiration phase 2 Sustained operations until 2007 (current L2Ps and L4)
Around and beyond Medspiration Building a European Operational Facility for the delivery of SST New sensors/data
EUMETSAT/SAF O&SI : production of global METOP swath products complying to next GDS format & content specifications
European GDAC [MERSEA]: collect/consolidate worldwide data New synthesis products (L4 maps)
Atlantic (end 2005) / Global (2006) analysis [MERSEA] Regional high resolution products
Reprocessing activities Reprocessing of ERS-1/ERS-2 ATSR to L2P format and content
R&D, Data quality assessment and monitoring MERSEA R&D activities on diurnal cycle correction, sensor merging, optimal interpolation Match-up database (IFREMER/CORIOLIS)
– serves internal needs, support R&D activities for MERSEA, SMOS,…– take advantages of CORIOLIS and MEDSPIRATION colocation, rely on local competencies in in
situ data management and dissemination– implementation starts in June
No funding yet beyond 2007
MERIS-(A)ATSR workshop, ESRIN – 28th September 2005
Conclusion
The major operational service for SST delivery at European scale (with respect to the number of products)
Strong involvement within GHRSST-PP => play a leading role Quality of service assessed by operational users : UKMet, MetNo, DMI,
MERCATOR, CNR/MFSTEP A basis to meet the MERSEA needs
Scalable system Operational and sustained service Takes advantage of the compatibility with « extra-European » RDACs
Allows easy move towards global scale (product consistency) Provide tools to support MERSEA activities
L4/OI software package MDB records and HR-DDS => diurnal cycle variability, sensor merging,…