STATISTICAL CONSIDERATIONS IN ATMOSPHERIC DATA ASSIMILATIONRoss Bannister, Stefano MiglioriniAlan O'Neill, William Lahoz, Roger Brugge In data assimilation we must:
Some of DARC's activities:
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1. How can we best assimilate data from ENVISAT? |
Observational data:Existing approach at Met Office (obsolete)Assimilate by interpolation and with fixed and diagonal .
DARC approach #1 (implemented)
Assimilate by layer averaging and with fixed and diagonal .
DARC approach #2 (planned) - S.Migliorini, C.RodgersAssimilate by averaging kernels and with full error statistics.
Retrieved state and 'truth'
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Example Averaging Kernels for MIPAS OzoneIFAC-CNR, University of Bologna |
2. How can we use physics to better estimate uncertainties in the background fields?R.Bannister, I.Roulstone, M.Cullen, N.Nichols Pressure-Pressure & Pressure-Theta Theta-Pressure Covariances Horizontal wind-Pressure Covariances
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Part of the transformation between and spaces is to choose alternative parameters.
Statistics are accumulated for each parameter |