| Errors of the day |
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| • | They
are instabilities
of the background flow |
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| • | They dominate the analysis and
forecast errors |
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| • | They
are not taken
into account in data assimilation |
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| except
for 4D-Var and Kalman Filtering (very |
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| expensive
methods) |
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| • | Their
shape can be estimated with breeding |
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| • | Their
shape is frequently simple (low dimensionality, |
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| Patil
et al, 2001) |
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| • | A coupled ENSO system contains “errors of the
month” |
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