OSI-SAF VIIRS SST Pierre Le Borgne, Gérard Legendre, Anne Marsouin, Sonia Péré, Hervé Roquet...
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Transcript of OSI-SAF VIIRS SST Pierre Le Borgne, Gérard Legendre, Anne Marsouin, Sonia Péré, Hervé Roquet...
![Page 1: OSI-SAF VIIRS SST Pierre Le Borgne, Gérard Legendre, Anne Marsouin, Sonia Péré, Hervé Roquet Centre de Météorologie Spatiale, Météo-France, Lannion, France.](https://reader035.fdocuments.net/reader035/viewer/2022062320/56649f525503460f94c75de9/html5/thumbnails/1.jpg)
OSI-SAF VIIRS SST
Pierre Le Borgne, Gérard Legendre, Anne Marsouin, Sonia Péré, Hervé Roquet Centre de Météorologie Spatiale, Météo-France, Lannion, France
With contribution of Alexander Ignatov, NOAA
![Page 2: OSI-SAF VIIRS SST Pierre Le Borgne, Gérard Legendre, Anne Marsouin, Sonia Péré, Hervé Roquet Centre de Météorologie Spatiale, Météo-France, Lannion, France.](https://reader035.fdocuments.net/reader035/viewer/2022062320/56649f525503460f94c75de9/html5/thumbnails/2.jpg)
SPIE Defense, Security and Sensing, Baltimore, 29 April-3 May 2013
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Outline
Objectives Operational chain overview and status Quality Level definition Algorithm determination Validation results Conclusions
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SPIE Defense, Security and Sensing, Baltimore, 29 April-3 May 2013
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Objectives
CMS is commited to produce SST over the NAR area for the EUMETSAT/OSISAF
We aim to start delivering operational L3C products (GDSV2.0 compliant in netcdf 4) in mid 2013
The VIIRS SST chain will be a test chain for our next operational METOP/AVHRR SST chain
![Page 4: OSI-SAF VIIRS SST Pierre Le Borgne, Gérard Legendre, Anne Marsouin, Sonia Péré, Hervé Roquet Centre de Météorologie Spatiale, Météo-France, Lannion, France.](https://reader035.fdocuments.net/reader035/viewer/2022062320/56649f525503460f94c75de9/html5/thumbnails/4.jpg)
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The OSI SAF VIIRS SST chain overview
ExperimentalOE SST
Radiometric data
Maia cloud mask
Cloud mask controlNo masking!
Multispectral SST calculations
Granule workfile
Algorithm correctionNWP profilesEvery 86 s granule
Remapping and format
NAR SST product MDB
![Page 5: OSI-SAF VIIRS SST Pierre Le Borgne, Gérard Legendre, Anne Marsouin, Sonia Péré, Hervé Roquet Centre de Météorologie Spatiale, Météo-France, Lannion, France.](https://reader035.fdocuments.net/reader035/viewer/2022062320/56649f525503460f94c75de9/html5/thumbnails/5.jpg)
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From radiom. dataTo workfile
From workfile to NAR
MDB extraction
Buoy!
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Adjacency algorithm
VIIRS pixel neighborhood is needed for:– T11-T12 smoothing
– Gradient computation
– Matchup Database extraction
Trimmed pixels and scan overlapping must be taken into account -> adjacency algorithm needed!
JPSS OAD document for Common Adjacency Software describes the common Adjacency algorithm
An extended algorithm has been derived to allow neighborhood determination to extend beyond adjacent scans
![Page 7: OSI-SAF VIIRS SST Pierre Le Borgne, Gérard Legendre, Anne Marsouin, Sonia Péré, Hervé Roquet Centre de Météorologie Spatiale, Météo-France, Lannion, France.](https://reader035.fdocuments.net/reader035/viewer/2022062320/56649f525503460f94c75de9/html5/thumbnails/7.jpg)
SPIE Defense, Security and Sensing, Baltimore, 29 April-3 May 2013
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Raw data
Pixel of interest
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After local adjacency has been determined
Pixel of interest
![Page 9: OSI-SAF VIIRS SST Pierre Le Borgne, Gérard Legendre, Anne Marsouin, Sonia Péré, Hervé Roquet Centre de Météorologie Spatiale, Météo-France, Lannion, France.](https://reader035.fdocuments.net/reader035/viewer/2022062320/56649f525503460f94c75de9/html5/thumbnails/9.jpg)
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OSI-SAF VIIRS SST chain: status
Preoperational since mid October 2012
Cloud mask control completed
Final product ready (GDSV2.0 in netcdf4 )
Operational delivery to start in mid 2013
NWP derived correction will be introduced afterwards
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Quality levels?
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Quality levels
?
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Indicators
?
Error as a function ofTs-clim. Minimum,On the MDB
Gradient indicatorAerosol indicatorIce indicator…..
Mask indicator= mean of all indicators
Limit valueCritical value
Indicators defined between 0=clear et 100=cloudyBy limit and critical values such as:
Tlimit-TsTemp. Indicator= -------------- x 100
Tlimit-Tcritical
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Quality levels
Cloud mask indicator : mean of all indicators– Temperature indicator (distance to minimum SST clim)
– Gradient indicator (distance to maximum SST gradient clim)
– Dust indicator (derived from SEVIRI SDI)
– Ice indicator (derived from OSI SAF ice information)
Algorithm risk:– Derived from algorithm potential problems
Mask indicator
Algorithm risk
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VIIRS SST field on the 20 March 2013 at 02:00
![Page 15: OSI-SAF VIIRS SST Pierre Le Borgne, Gérard Legendre, Anne Marsouin, Sonia Péré, Hervé Roquet Centre de Météorologie Spatiale, Météo-France, Lannion, France.](https://reader035.fdocuments.net/reader035/viewer/2022062320/56649f525503460f94c75de9/html5/thumbnails/15.jpg)
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Undetected cloudiness
VIIRS SST – Minimum SST Climatology (OSTIA) 20 March 2013 at 02:00
![Page 16: OSI-SAF VIIRS SST Pierre Le Borgne, Gérard Legendre, Anne Marsouin, Sonia Péré, Hervé Roquet Centre de Météorologie Spatiale, Météo-France, Lannion, France.](https://reader035.fdocuments.net/reader035/viewer/2022062320/56649f525503460f94c75de9/html5/thumbnails/16.jpg)
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Cloudiness detected by low SST values
Temperature indicator derived from the SST- mini clim difference 20 March 2013 at 02:00
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Cloudiness detected by high gradient values
VIIRS SST gradients on the 20 March 2013 at 02:00
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Univ. Rhode Island Pathfinderderived maximum gradient climatology
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Climatology missing
Erroneous location of max gradients
Gradient indicator
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Mask indicator (mean of all indicators)0= no risks; 100=critical
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SST confidence levels:Increasing quality from 2 to 5
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VIIRS SST field on the 22 September 2012 at 13:00
![Page 23: OSI-SAF VIIRS SST Pierre Le Borgne, Gérard Legendre, Anne Marsouin, Sonia Péré, Hervé Roquet Centre de Météorologie Spatiale, Météo-France, Lannion, France.](https://reader035.fdocuments.net/reader035/viewer/2022062320/56649f525503460f94c75de9/html5/thumbnails/23.jpg)
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VIIRS SST – Mean SST Climatology (OSTIA) 22 September 2012 at 13:00
![Page 24: OSI-SAF VIIRS SST Pierre Le Borgne, Gérard Legendre, Anne Marsouin, Sonia Péré, Hervé Roquet Centre de Météorologie Spatiale, Météo-France, Lannion, France.](https://reader035.fdocuments.net/reader035/viewer/2022062320/56649f525503460f94c75de9/html5/thumbnails/24.jpg)
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SEVIRI derived SDI
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Dust indicator
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Algorithm determination
RTTOV-10 applied on the SAFREE (radiosonde profiles) data base
Daytime algorithms NLC : SST = (a + b S) T11 + (c + d Tsclim + e S) (T11 - T12) + f S + g (1)
Night-time algorithmsT37_1 : SST = (a + b S) T37 + (c + d S) (T11 - T12) + e S + f (2)where :
– TSclim = first guess climatologic SST
– S = 1/cos () – 1
In practice T11-T12 are smoothed in a 11x11 pixel box
![Page 27: OSI-SAF VIIRS SST Pierre Le Borgne, Gérard Legendre, Anne Marsouin, Sonia Péré, Hervé Roquet Centre de Météorologie Spatiale, Météo-France, Lannion, France.](https://reader035.fdocuments.net/reader035/viewer/2022062320/56649f525503460f94c75de9/html5/thumbnails/27.jpg)
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Overall validation results
NAR area; 15 October 2012 till 15th March 2013Qual levels 3-5
Daytime qual. 3-5
Daytime qual. 5
Nighttime qual. 3-5
Nighttime qual. 5
number of cases
3088 990 3648 1678
bias -0.13 -0.10 -0.05 0.03
standard-deviation
0.46 0.34 0.37 0.29
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NPP/VIIRS cloud detection is more efficient than the equivalent NOAA-A9/AVHRR
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Overall validation results:Daytime
Qual 5: =-0.10; =0.34
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Overall validation results:Nighttime
Qual 5: =0.03; =0.29
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Conclusion
A VIIRS SST chain has been run in preoperational mode since mid October 2012
Validation results are OK– Cloud free coverage significantly larger than NOAA-19
– Daytime and nighttime standard deviation: 0.46 and 0.37 K resp.
Next phases:– Starting operational delivery (mid 2013)
– NWP derived BT simulations and bias correction/Optimal Estimation
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Example of a granule over NE Atlantic…..
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THE END
….Remapped at 1 km resolution over Brittany