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James A. Cummings and Ole Martin Smedstad

error, while a positive δ e 48 value indicates a nonbeneficial observation (forecast error actually increased from assimilation of the observation). Nonbeneficial impacts are not expected, since the assimilation is expected to decrease forecast error by producing improved initial conditions. However, if nonbeneficial impacts occur, and they are persistent, then that may indicate problems with data quality or model performance. Thus, the data impact system can be used as an effective observing

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