Transcript Third GSICS Users’ Workshop Concluding Remarks Jerome Lafeuille (WMO) Tim Hewison (EUMETSAT) Xiangqian Wu (NOAA)

Third GSICS Users’ Workshop
Concluding Remarks
Jerome Lafeuille (WMO)
Tim Hewison (EUMETSAT)
Xiangqian Wu (NOAA)
Update on GSICS
• GSICS overall status (Mitch Goldberg)
– Main goal is to develop/implement operational procedures for calibration and traceability of satellite
observations (level 1) data, assess how instrument specifications are met
– Quantify, Explain and Correct the differences in calibration of different instruments
– Members:CMA,CNES,EUMETSAT,IMD,ISRO,JAXA,JMA,NASA,NIST,NOAA,ROSHYDROMET,USGS,WMO
– Observer: ESA
– Partners : GPM X-CAL, CEOS WGCV/IVOS, GCOS/GRUAN
• Product status (Tim Hewison, Andy Heidinger)
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Product types: Bias monitoring, GSICS correction (NRT or re-analysis), Reports and guidelines
Products available at demo stage: GEO IR (GOES, Meteosat, MTSAT) , AVHRR PATMOS (Solar bands)
Products to be available soon: GEO IR (FY-2, COMS)
On going developments: GEO VIS, LEO/HIRS, LEO MW (SSM/I, MSU/AMSU), LEO/AVHRR
• Access (see “gsics.wmo.int” )
– GSICS Data & Products Servers (THREDDS-based system)
– Websites of GSICS Processing & Research Centres (GPRCs)
07 November 2015
Slide: 2
GEO-LEO IR Product Status 2011-09
GPRC
Monitored
Instrument
Reference
Instrument
GSICS NRT
Correction
GSICS ReAnalysis
Correction
GSICS Bias
Monitoring
EUMETSAT
Meteosat-9 }
Meteosat-8 }-Meteosat-7 }
IASI
Demonstration
Demonstration
Prototype
JMA
MTSAT-1R }
MTSAT-2 }
IASI (+ AIRS)
Demonstration
Demonstration
Prototype
GOES-11 Imager
GOES-12 Imager
IASI (+ AIRS)
Demonstration
Demonstration
Prototype
GOES Sounder
IASI (+ AIRS)
In development
In development In development
CMA
FY2C }
FY2D } -FY2E }
IASI (+ AIRS)
In development
In development Prototype
KMA
COMS
IASI (+ AIRS)
In development
In development In development
NOAA
07 November 2015
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External User (e.g., NWP) Feedback to GCC
• External users have expressed very positive feedbacks on ATBDs
and correction data availability
• Impact of GSICS correction on derived products
– Apparent impact on TPW, CTH, CM-SAF cloud products [Meteosat-9]
– Significant impact on SST and CSR [MTSAT] : comparison with NWP suggests
further analysis
– TB against model [GOES-12 imager 13.3μm channel]: less noise
– TB against AIRS [FY-2C/D/E] : significant reduction of bias
– TB against AIRS [COMS] : significant reduction of bias
– Cloud Top Pressure [GOES sounder]: encouraging reduction of noise
 Often there are apparent impacts but we have yet to prove
that the impacts are positive.
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Internal User (e.g., GPRC) Feedback to GCC
• GPRC can uses GSICS products to monitor, diagnose, and correct for
the root cause of calibration inaccuracy (midnight anomaly,
decontamination)
 Need to further strengthen and expand these efforts
• More successful examples of improving the calibration accuracy
through shifting the SRF.
 However GSICS products cannot justify any specific change in SRF,
only the need and effect of such a change
07 November 2015
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Proposed products (1)
• Common reference channels
– No requirement for generating inter-calibration products for virtual ”common
reference channels”.
– Common specifications should however be encouraged
 WMO Space Programme should raise it to CGMS and propose development
of guidelines for the design of future instruments, with a view of
harmonizing at least a set of core channels (central λ and SRF)
• Intercalibration of Solar band channels
– (S.H. Ham) 3 methods (Ray-matching, simulated clouds, DCC) showed
comparable results on COMS data.
– DCC method has no significant dependency on threshold IR calibration
 This is encouraging for future GSICS solar band calibration
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Slide: 6
Proposed products (2)
• Intercalibration of LEO-LEO / proposed strategy:
– Review requirements
– Identify relevant current activities
– Invite submission of products for evaluation
• MSU/AMSU [Zou]
– recalibration of MSU, SSU, AMSU datasets over 30 years enables derivation
of Upper-air temperature TCDR showing excellent consistency with GPS-RO
– Encouraging results
 Should be pursued , and CDR generation algorithm submitted to GPPA
07 November 2015
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Proposals from GSICS users and partners (1)
• GPM X-Cal MW inter-calibration activities
– Blend of WindSat and TRMM/TMI currently used as reference for consensus
calibration (CC_1.1)
– Models double differencing provides relative reference
– TMI conical scanning has pointing uncertainty that needs to be assessed
– Developments on going for CC_1.2
– AMSR-E, SSM/I, SSMIS, Megha-Tropiques/MADRAS, GCOM-W/AMSR-2
– MW sounder intercomparison reveals a lot of dispersion
 X-CAL – GSICS collaboration could allow optimizing overall effort
 X-CAL willing to share data, models, documentation, results with GSICS and
assist e.g. In data transfer (Considering data policy aspects, define the
appropriate level of data that can be exchanged in near real time.)
 GSICS willing to assist to evaluate X-CAL consensus calibration in GPPA
07 November 2015
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Proposals from GSICS users and partners (2)
• EUMETSAT climate activities, GEWEX RP & SCOPE-CM (J. Schulz)
– Within EUMETSAT, GSICS players will participate in climate group
– GEWEX Radiation Panel stresses need for independent assessment of GSICS
intercalibration products. What is the metrics?
 Role of user feedback
 Suitability metrics depends on user needs => SCOPE-CM to state its needs
– SCOPE-CM suggests applying DCC to inter-calibrate all GEO solar bands (to
support albedo production)
– SCOPE-CM suggests GEO IR calibration against HIRS to go back in time
before AIRS and IASI
07 November 2015
Slide: 9
Proposals from GSICS users and partners (3)
• NOAA CDR activities (Jeff Privette)
– Merging NASA, NOAA, USGS data will provide information at climate time
scale and quality
– Maturity Matrix (similarity with GPPA)
• Proposals
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07 November 2015
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Calibration back in time
Routine calibration processes for Interim CDR
Competitive approaches for same product => stimulate development
Build consistent readily usable L1 data sets (FCDR)
GSICS education campaign needed : GSICS should be described, referenced,
documented, but not prerequisite for other calibration developments
• (Note: Google search on ”gsics” leads to ”gsics.wmo.int”)
Proposals from GSICS users and partners (4)
• Double differencing with NWP for weather and climate (R.
Saunders)
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07 November 2015
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Understanding the bias is important
NWP double differencing can expand the SNO intercomparisons
NWP shows bias drift of SEVIRI 13.4 channel , and other instruments
Bias dependency on radiance of the scene
Highlights the relevance of NWP monitoring as a complement to colocated
observations
Further feedback from the 3rd workshop
• Uniform product(s) during algorithm development ?
– Development of consensus algorithm may take a long time, in fact
development can be continuous.
– Users were asked whether they need uniform products (produced with one
algorithm for all satellites) during development
– Users showed no preference
• New beta user proposals ?
– UK Met Office interesting in testing GSICS Corrections for Meteosat visible
channels and assessing impact on cloud detection algorithms
07 November 2015
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Overall conclusions / way forward
• GSICS effort is useful, addresses essential needs, must be pursued
• Relevance of proposed products is confirmed
• Need to perform and document systematic, independent
verification/assessment of GSICS calibration
• There are expectations for a metrics of suitability for climate needs
– Confirms relevance of « Statement of needs » by climate users (SCOPE-CM)
• Need an education campaign delineating GSICS scope and
presenting clearly the status (what is operational) , and the plans
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Recommendations for Exec Panel
• Discuss ways to formalize relationship with SCOPE-CM:
– Adding representatives of SCOPE-CM, WOAP or GEWEX-RP to
GSICS Exec Panel?
– Or forming GSICS Users’ Board, chaired by one of above?
• Formulate GSICS Programme Principles
– In support of GCC education programme
– for publication on GSICS websites
• Cooperate with CEOS WGCV to define “best practice” methodology
– to compare different calibration and validation methods and
– to generate uncertainty analyses based on these comparisons
07 November 2015
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Recommendations for GCC
• Align product distribution modes with NOAA’s CDR
Maturity Matrix levels
– and reflect this in GPPA and GCC website
• Assist submission of NOAA CDR for MSU/SSU/AMSUA to
GPPA
• Publish GSICS Principles (Research, Data & Programme)
– To better engage user community in education programme
07 November 2015
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Recommendations for GRWG
• GRWG microwave subgroup to meet XCAL representatives
– to discuss submission of CC1.1 products to GPPA
– following release (~Nov 2011)
• Formulate GSICS Research Principles
– In support of GCC education programme for publication on GSICS websites
• GRWG to discuss Jörg Schulz’s specific questions from SCOPE-CM:
– “What is GSICS doing about the validation of the derived inter-calibration,
e.g., utilisation of Geo overlaps to test the calibration to a reference?”
− implementing the DCC for all GEOS to support the surface albedo production
− extending IASI/AIRS – GEO inter-calibration to HIRS and go back to 1982 to
support activities on UTH
07 November 2015
Slide: 16
Recommendations for GDWG
• Formulate GSICS Data Principles
– In support of GCC education programme for publication on
GSICS websites
07 November 2015
Slide: 17