CM-SAF Board Meeting , De Bilt, October 2005

CM-SAF TOA radiation status report

D. Caprion

Royal Meteorological Institute of Belgium

CM-SAF Board Meeting , De Bilt, October 2005

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

CM-SAF Board Meeting , De Bilt, October 2005

Main problems Hardware problems beginning of September

– Unfortunately check our backup systemNot 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 ?

CM-SAF Board Meeting , De Bilt, October 2005

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 ?

CM-SAF Board Meeting , De Bilt, October 2005

Grid ? Yes… And no ? Why?

– The Earth is an ellipsoid

– What do we need: fixed pixel location or fixed pixel size ?

CM-SAF Board Meeting , De Bilt, October 2005

Grid ? In other words:

– What kind of implementation ?

DWD RMIB

CM-SAF Board Meeting , De Bilt, October 2005

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 ?

CM-SAF Board Meeting , De Bilt, October 2005

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 !

CM-SAF Board Meeting , De Bilt, October 2005

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 !!

CM-SAF Board Meeting , De Bilt, October 2005

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

CM-SAF Board Meeting , De Bilt, October 2005

Changes to operational chain

GERB GERB-like

Regridding

Merge with CERES

Averaging

GERB GERB-like

Regridding

Averaging

Regridding

Averaging

Final products in HDF files

+

CM-SAF Board Meeting , De Bilt, October 2005

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.

CM-SAF Board Meeting , De Bilt, October 2005

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 ?

CM-SAF Board Meeting , De Bilt, October 2005

Conclusions Continue to check operational chains. Should we change the grid ?!? GERB data release planned for...

Beginning 2006

So reprocessing.....