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CM-SAF TOA radiation status report

D. Caprion Royal Meteorological Institute of Belgium. CM-SAF TOA radiation status report. Overview. Main problems since lastest meeting Changes to operational chains Status input products: GERB Status input products: CERES. Main problems. Hardware problems beginning of September

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CM-SAF TOA radiation status report

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  1. D. Caprion Royal Meteorological Institute of Belgium CM-SAF TOA radiation status report

  2. Overview • Main problems since lastest meeting • Changes to operational chains • Status input products: GERB • Status input products: CERES

  3. Main problems • Hardware problems beginning of September • Unfortunately check our backup system Not so bad, not so good: so need of improvements ! • Consequences: delays to deliver products: High resolution: OK now TOA fluxes: July and August coming soon... • Definition of the grid: • What kind of grid shall we have to use ?

  4. Grid ? • What do we want ? • Equal-area grid with a resolution of: either (15 km)² or (45 km)² • Answer : • Sinusoidal grid with 2N x N pixels • Tuning of N to get the resolution • But does it fully answer the requirements ?

  5. Grid ? • Yes… And no ? Why? • The Earth is an ellipsoid • What do we need: fixed pixel location or fixed pixel size ?

  6. Grid ? • In other words: • What kind of implementation ? DWD RMIB

  7. Grid ? • Consequences: • DWD • Exact Equal-area grid but non-linear dependence of the latitude with the pixel index ! • RMIB • Linear dependence of the latitude with pixel index but nearly Equal-area grid ! • Open questions ?

  8. Grid ? • Try and be a user: • 1. Do I really need an exact Equal-area grid in which geolocation is not trivial ? • 2. Do I need an easy geolocation even if I lost the exact Equal-area property of my grid ? • 3. How do I manage to pass from the low resolution to the high resolution grid ? If not implemented in the same way !

  9. Grid ? • From RMIB point of view: • No definitive answer, except: • It is always easier to use: lat =90-180*y/N lon=(x-N)*180/(N*cos(lat)) • Than implement an elliptic integral needed to compute the fixed size of the pixels. • The user should easily go from one grid to the other one !!

  10. Changes to operational chain • Implementation of three parallel chains: • 1 mixed (GERB/GERB-like) chain: current one • 1 pure GERB • 1 pure GERB-like test on data from May 2005 to now

  11. Changes to operational chain GERB-like GERB-like GERB GERB Regridding Regridding Regridding + Averaging Averaging Averaging Merge with CERES Final products in HDF files

  12. GERB status • Instrument currently in safe mode • Till mid-October (eclipse seasons) • Planned release: beginning 2006 • GIST meeting end of December 2005 to give official approval • Planned reprocessing: as soon as possible • Preliminary tests on June and July 2004 seems to be positive.

  13. CERES status • Currently used: ES9, Terra, FM1, Edition 1 • Available up to August 2005 • More advanced: SRBAVG • Better angular models, better spatial resolution • Still waiting for ! • Decision beginning of November ?

  14. Conclusions • Continue to check operational chains. • Should we change the grid ?!? • GERB data release planned for... Beginning 2006 • So reprocessing.....

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