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| Data assimilation: combine a forecast with
observations. We |
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| make a temperature forecast Tb
and then take an observation To. |
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| A popular way to optimally estimate the truth
(analysis) is to |
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| minimize the “3D-Var” cost function: |
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| The
analysis is given by |
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| where |
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| and the analysis error |
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| variance is smaller |
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| than the forecast or obs. |
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